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2026-03-30rcutorture: Add NOCB02 config for nocb poll mode testingJoel Fernandes2-0/+23
Add new rcutorture config NOCB02 that enables rcu_nocb_poll boot parameter combined with CONFIG_RCU_NOCB_CPU to exercise the polling mode code paths in the NOCB implementation. This config exercises poll-mode paths not covered by other configs, where callback invocation uses active polling instead of kthread wakeups. This config is not added to CFLIST to avoid increasing the default test duration; it can be run explicitly when poll-mode testing is needed. Acked-by: Frederic Weisbecker <frederic@kernel.org> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcutorture: Add NOCB01 config for RCU_LAZY torture testingJoel Fernandes2-0/+23
Add new rcutorture config NOCB01 that enables CONFIG_RCU_LAZY combined with CONFIG_RCU_NOCB_CPU to exercise the lazy callback code paths in the NOCB implementation. This config exercises lazy callback paths not covered by other configs, including lazy-only wake and lazy defer logic. This config is not added to CFLIST to avoid increasing the default test duration; it can be run explicitly when lazy callback testing is needed. Acked-by: Frederic Weisbecker <frederic@kernel.org> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcuscale: Ditch rcu_scale_shutdown in favor of torture_shutdown_init()Paul E. McKenney1-1/+1
The torture_shutdown_init() function spawns a shutdown kthread in a manner very similar to that implemented by rcu_scale_shutdown(). This commit therefore re-implements rcu_scale_shutdown() in terms of torture_shutdown_init(). This patch was generated by Claude given as input the patch making the same transformation of ref_scale_shutdown(). Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30refscale: Ditch ref_scale_shutdown in favor of torture_shutdown_init()Paul E. McKenney1-1/+1
The torture_shutdown_init() function spawns a shutdown kthread in a manner very similar to that implemented by ref_scale_shutdown(). This commit therefore re-implements ref_scale_shutdown in terms of torture_shutdown_init(). The initial draft of this patch was generated by version 2.1.16 of the Claude AI/LLM, but trained and configured for use by my employer, and prompted to refer to Linux-kernel source code. This initial draft failed to provide a forward reference to ref_scale_cleanup(), passed zero to torture_shutdown_init() for an unwelcome insta-shutdown, and failed to pass the kvm.sh --duration argument in as a refscale module parameter. On the other hand, it did catch the need to NULL main_task on the post-test self-shutdown code path, which I might well have forgotten to do. This version of the patch fixes those problems, and in fact very little of the initial draft remains. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcutorture: Fix numeric "test" comparison in srcu_lockdep.shPaul E. McKenney1-3/+3
This commit switches from "-eq" to "=" to handle the non-numeric comparisons in srcu_lockdep.sh. While in the area, adjust SRCU flavor to improve coverage. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30torture: Print informative message for test without recheck filePaul E. McKenney1-1/+6
If a type of torture test lacks a recheck file, a bash diagnostic is printed, which looks like a torture-test bug. This commit gets rid of this false positive by explicitly checking for the file, invoking it if it exists, otherwise printing an informative non-diagnostic message. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30torture: Make hangs more visible in torture.sh outputPaul E. McKenney2-2/+1
This commit labels "QEMU killed" lines so that they will be picked up by torture.sh processing. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30kvm-check-branches.sh: Remove in favor of kvm-series.shPaul E. McKenney1-102/+0
The kvm-series.sh script is an order-of-magnitude optimization of kvm-check-branches.sh, so remove the old script. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcutorture: Add a textbook-style trivial preemptible RCUPaul E. McKenney2-0/+15
This commit adds a trivial textbook implementation of preemptible RCU to rcutorture ("torture_type=trivial-preempt"), similar in spirit to the existing "torture_type=trivial" textbook implementation of non-preemptible RCU. Neither trivial RCU implementation has any value for production use, and are intended only to keep Paul honest in his introductory writings and presentations. [ paulmck: Apply kernel test robot feedback. ] Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-05scftorture: Update due to x86 not supporting none/voluntary preemptionPaul E. McKenney1-1/+2
As of v7.0-rc1, architectures that support preemption, including x86 and arm64, no longer support CONFIG_PREEMPT_NONE or CONFIG_PREEMPT_VOLUNTARY. Attempting to build kernels with these two Kconfig options results in .config errors. This commit therefore switches such scftorture scenarios to CONFIG_PREEMPT_LAZY. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260303235903.1967409-4-paulmck@kernel.org
2026-03-05refscale: Update due to x86 not supporting none/voluntary preemptionPaul E. McKenney2-2/+4
As of v7.0-rc1, architectures that support preemption, including x86 and arm64, no longer support CONFIG_PREEMPT_NONE or CONFIG_PREEMPT_VOLUNTARY. Attempting to build kernels with these two Kconfig options results in .config errors. This commit therefore switches such refscale scenarios to CONFIG_PREEMPT_LAZY. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260303235903.1967409-3-paulmck@kernel.org
2026-03-05rcuscale: Update due to x86 not supporting none/voluntary preemptionPaul E. McKenney2-2/+4
As of v7.0-rc1, architectures that support preemption, including x86 and arm64, no longer support CONFIG_PREEMPT_NONE or CONFIG_PREEMPT_VOLUNTARY. Attempting to build kernels with these two Kconfig options results in .config errors. This commit therefore switches such rcuscale scenarios to CONFIG_PREEMPT_LAZY. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260303235903.1967409-2-paulmck@kernel.org
2026-03-05rcutorture: Update due to x86 not supporting none/voluntary preemptionPaul E. McKenney12-13/+29
As of v7.0-rc1, architectures that support preemption, including x86 and arm64, no longer support CONFIG_PREEMPT_NONE or CONFIG_PREEMPT_VOLUNTARY. Attempting to build kernels with these two Kconfig options results in .config errors. This commit therefore switches such rcutorture scenarios to CONFIG_PREEMPT_LAZY. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com> Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/bfe89f6c-3b63-40c6-aa6d-5f523e3e9a31@paulmck-laptop
2026-01-04Merge branch 'rcu-torture.20260104a' into rcu-nextBoqun Feng5-24/+205
* rcu-torture.20260104a: rcutorture: Add --kill-previous option to terminate previous kvm.sh runs rcutorture: Prevent concurrent kvm.sh runs on same source tree torture: Include commit discription in testid.txt torture: Make config2csv.sh properly handle comments in .boot files torture: Make kvm-series.sh give run numbers and totals torture: Make kvm-series.sh give build numbers and totals torture: Parallelize kvm-series.sh guest-OS execution rcutorture: Add context checks to rcu_torture_timer()
2026-01-04rcutorture: Add --kill-previous option to terminate previous kvm.sh runsJoel Fernandes1-1/+24
When kvm.sh is killed, its child processes (make, gcc, qemu, etc.) may continue running. This prevents new kvm.sh instances from starting even though the parent is gone. Add a --kill-previous option that uses fuser(1) to terminate all processes holding the flock file before attempting to acquire it. This provides a clean way to recover from stale/zombie kvm.sh runs which sometimes may have lots of qemu and compiler processes still disturbing. Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-04rcutorture: Prevent concurrent kvm.sh runs on same source treeJoel Fernandes2-0/+18
Add flock-based locking to kvm.sh to prevent multiple instances from running concurrently on the same source tree. This prevents build failures caused by one instance's "make clean" deleting generated files while another instance is building causing build failures. The lock file is placed in the rcutorture directory and added to .gitignore. Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01torture: Include commit discription in testid.txtPaul E. McKenney1-1/+1
Currently, the testid.txt file in the top-level directory of the rcutorture results contains the output of "git rev-parse HEAD", which just gives the full SHA-1 of the current commit. This is followed by the output of "git status", which is further followed by the output of "git diff". This works, but is less than helpful to human readers scanning a list of commits. This commit therefore instead uses "git show --oneline --no-patch HEAD", which provides a short SHA-1, but also the names of any branches and the commit's title. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01torture: Make config2csv.sh properly handle comments in .boot filesPaul E. McKenney1-1/+1
As in strip the "#" and everything after it and *then* tokenize. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01torture: Make kvm-series.sh give run numbers and totalsPaul E. McKenney1-1/+4
The kvm-series.sh script can easily be convinced to run on the order of 1,000 guest OSes, so some sort of progress indicator would be helpful. This commit therefore updates the "Starting" output lines to read as in the following example, adding the ("3 of 4"): Starting TREE02/1.7e0ad1b49057 using 8 CPUs (4 of 4) Sat Nov 8 10:51:06 PM PST 2025 Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01torture: Make kvm-series.sh give build numbers and totalsPaul E. McKenney1-1/+6
The kvm-series.sh script can easily be convinced to do on the order of 1,000 builds, so some sort of progress indicator would be helpful. This commit therefore updates the "Starting" output lines to read as in the following example, adding the ("2 of 4"): Starting TREE01/1.7e0ad1b49057 (2 of 4) at Sat Nov 8 10:08:21 PM PST 2025 Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01torture: Parallelize kvm-series.sh guest-OS executionPaul E. McKenney1-21/+153
Currently, kvm-series.sh builds and runs serially, which makes for long execution times. This commit changes its logic to build all of the needed kernels serially, but then run the corresponding guest OSes concurrently in batches using the entire machine. On large systems, this results in order-of-magnitude speedups of the guest-OS execution portion of the runtime. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01rcu: Clean up after the SRCU-fastification of RCU Tasks TracePaul E. McKenney2-2/+0
Now that RCU Tasks Trace has been re-implemented in terms of SRCU-fast, the ->trc_ipi_to_cpu, ->trc_blkd_cpu, ->trc_blkd_node, ->trc_holdout_list, and ->trc_reader_special task_struct fields are no longer used. In addition, the rcu_tasks_trace_qs(), rcu_tasks_trace_qs_blkd(), exit_tasks_rcu_finish_trace(), and rcu_spawn_tasks_trace_kthread(), show_rcu_tasks_trace_gp_kthread(), rcu_tasks_trace_get_gp_data(), rcu_tasks_trace_torture_stats_print(), and get_rcu_tasks_trace_gp_kthread() functions and all the other functions that they invoke are no longer used. Also, the TRC_NEED_QS and TRC_NEED_QS_CHECKED CPP macros are no longer used. Neither are the rcu_tasks_trace_lazy_ms and rcu_task_ipi_delay rcupdate module parameters and the TASKS_TRACE_RCU_READ_MB Kconfig option. This commit therefore removes all of them. [ paulmck: Apply Alexei Starovoitov feedback. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: bpf@vger.kernel.org Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2025-11-30Merge branch 'rcu/misc' into nextFrederic Weisbecker3-16/+157
- In order to prepare the layout for nohz_full work deferral to user exit, the context tracking state must shrink the counter of transitions to/from RCU not watching. The only possible hazard is to trigger wrap-around more easily, delaying a bit grace periods when that happens. This should be a rare event though. Yet add debugging and torture code to test that assumption. - Fix memory leak on locktorture module - Annotate accesses in rculist_nulls.h to prevent from KCSAN warnings. On recent discussions, we also concluded that all those WRITE_ONCE() and READ_ONCE() on list APIs deserve appropriate comments. Something to be expected for the next cycle. - Provide a script to apply several configs to several commits with torture. - Allow torture to reuse a build directory in order to save needless rebuild time. - Various cleanups.
2025-11-07torture: Permit negative kvm.sh --kconfig numberic argumentsPaul E. McKenney1-1/+1
This commit loosens the kvm.sh script's regular expressions to permit negative-valued Kconfig options, for example: --kconfig CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN=-1 Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2025-11-06rcutorture: Make TREE04 use CONFIG_RCU_DYNTICKS_TORTUREValentin Schneider1-0/+1
We now have an RCU_EXPERT config for testing small-sized RCU dynticks counter: CONFIG_RCU_DYNTICKS_TORTURE. Modify scenario TREE04 to exercise to use this config in order to test a ridiculously small counter (2 bits). Link: http://lore.kernel.org/r/4c2cb573-168f-4806-b1d9-164e8276e66a@paulmck-laptop Suggested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Valentin Schneider <vschneid@redhat.com> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2025-11-06rcutorture: Permit kvm-again.sh to re-use the build directoryPaul E. McKenney1-16/+40
This commit adds "inplace" and "inplace-force" values to the kvm-again.sh "--link" argument, which causes the run's output to be placed into the build directory. This could be used to save build time if the machine went down partway into a run, but it can also be used to do a large number of builds, and run the resulting kernels concurrently even if the builds are based on different commits. A later commit will add this latter capability to kvm-series.sh in order to produce large speedups for branch-checking operations. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2025-11-06torture: Add kvm-series.sh to test commit/scenario combinationPaul E. McKenney1-0/+116
This commit adds a kvm-series.sh script that takes a list of scenarios and a list of commits, and then runs each scenario on all of the commits. A given scenario is run on all the commits before advancing to the next scenario to minimize build times. The successes and failures are summarized at the end of the run. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2025-08-14torture: Add --do-normal parameter to torture.sh help textPaul E. McKenney1-0/+1
The --do-normal parameter was missing from the torture.sh script's help text, so this commit adds it. Hopefully better late than never! Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2025-08-14rcutorture: Fix jitter.sh spin timePaul E. McKenney1-3/+24
An embarrassing syntax error in jitter.sh makes for fixed spin time. This commit therefore makes it be variable, as intended, albeit with very coarse-grained adjustment. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2025-07-23Merge branches 'rcu-exp.23.07.2025', 'rcu.22.07.2025', ↵Neeraj Upadhyay (AMD)8-44/+97
'torture-scripts.16.07.2025', 'srcu.19.07.2025', 'rcu.nocb.18.07.2025' and 'refscale.07.07.2025' into rcu.merge.23.07.2025
2025-07-16rcutorture: Remove SRCU-lite scenariosPaul E. McKenney3-14/+0
This commit prepares for the removal of SRCU-Lite by removing the SRCU-L rcutorture scenario that tests it. Both SRCU-lite and SRCU-fast provide faster readers by dropping the smp_mb() call from their lock and unlock primitives, but incur a pair of added RCU grace periods during the SRCU grace period. There is a trivial mapping from the SRCU-lite API to that of SRCU-fast, so there should be no transition issues. [ paulmck: Apply Christoph Hellwig feedback. ] Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Make torture.sh --allmodconfig testing fail on warningsPaul E. McKenney1-0/+4
Currently, the torture.sh --allmodconfig testing looks solely at the exit code from the kernel build, and thus fails to flag many compiler warnings. This commit therefore checks the kernel-build output for compiler diagnostics. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Add "ERROR" diagnostic for testing kernel-build outputPaul E. McKenney1-1/+1
Some recent kernel-build failures have featured "ERROR", so this commit adds it to the list checked by kvm-build.sh. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Make torture.sh tolerate runs having bad kvm.sh argumentsPaul E. McKenney1-6/+22
Currently, torture.sh assumes excessive levels of reviewer competence and thus fails to gracefully handle cases where it is tricked into giving kvm.sh invalid arguments. This commit therefore upgrades error handling to more gracefully handle this situation. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Add textid.txt file to --do-allmodconfig and --do-rcu-rust runsPaul E. McKenney1-0/+2
This commit causes the torture.sh --do-allmodconfig and --do-rcu-rust parameters to add testid.txt files to their results directories, thus allowing easier analysis of the results of a series of runs kicked off by "git bisect". Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Extract testid.txt generation to separate scriptPaul E. McKenney2-12/+30
The kvm.sh script places a testid.txt file in the top-level results directory in order to identify the tree and commit that was tested. This works well, but there are scripts other than kvm.sh that also create results directories, and it would be good for them to also identify exactly what was tested. This commit therefore extracts the testid.txt generation to a new mktestid.sh script so that it can be easily used elsewhere. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Suppress "find" diagnostics from torture.sh --do-none runPaul E. McKenney1-2/+5
When torture.sh is told to do nothing, it produces a couple of distracting diagnostics from the "find" command: find: ‘’: No such file or directory find: ‘’: No such file or directory This is pointless chatter and could cause confusion. This commit therefore suppresses these diagnostics when there is nothing to find. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-07-16torture: Provide EXPERT Kconfig option for arm64 KCSAN torture.sh runsPaul E. McKenney1-1/+8
The arm64 architecture requires that KCSAN-enabled kernels be built with the CONFIG_EXPERT=y Kconfig option. This commit therefore causes the torture.sh script to provide this option, but only for --kcsan runs on arm64 systems. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Marco Elver <elver@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: <kasan-dev@googlegroups.com> Cc: <linux-arm-kernel@lists.infradead.org> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25torture: Default --no-clocksourcewd on arm64Paul E. McKenney1-2/+2
Because arm64 does not support CONFIG_CLOCKSOURCE_WATCHDOG=n kernels, --do-clocksourcewd gets Kconfig errors. This commit therefore makes --do-no-clocksourcewd be the default on arm64. Note that arm64 users can still specify --do-clocksourcewd in order to override this default. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25torture: Default --no-rcutasksflavors on arm64Paul E. McKenney1-2/+11
Because arm64 does not support CONFIG_SMP=n kernels, --do-rcutasksflavors gets Kconfig errors when running the TINY01 rcutorture scenario. This commit therefore makes --no-rcutasksflavors be the default on arm64. Once kvm.sh automatically deselects CONFIG_SMP=n rcutorture scenarios on arm64, the two lines marked "FIXME" can be changed back from "${ifnotaarch64}" to "yes". Note that arm64 users can still specify --do-rcutasksflavors in order to override this default. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25torture: Make torture.sh KCSAN runs set CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=yPaul E. McKenney1-1/+6
The RCU_TORTURE_TEST_CHK_RDR_STATE Kconfig option is used for low-level debugging of rcutorture's generation of overlapping and nested RCU readers. It incurs significant overhead, and is thus not to be used lightly. But if it is not tested regularly, it won't be there when it is needed, for example, it would have found an rcutorture bug in the testing of srcu_up_read(). This commit therefore uses CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=y when building KCSAN kernels, but only for the --do-rcutorture case. Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25torture: Permit multiple space characters in kvm.sh --kconfig argumentPaul E. McKenney1-1/+1
The straightforward way of doing bash substitution for optional strings leaves a pair of space characters, which the kvm.sh --kconfig option rejects as ill-formed. This commit therefore changes the corresponding regular expression to accommodate more than one space character between successive Kconfig options. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25torture: Suppress torture.sh "Zero time" messages for disabled testsPaul E. McKenney1-3/+3
The torture.sh script prints " --- Zero time for locktorture, disabling" when the --duration parameter is too short to allow the test to run even when locktorture has been disabled, for example, via --do-none. The same is true for scftorture and rcutorture. This commit therefore suppresses this message when the corresponding test has been disabled. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-06-25rcutorture: Make BUSTED scenario check and log readersPaul E. McKenney1-0/+3
Because the BUSTED scenario intentionally executes too-short readers, this commit enables the RCU_TORTURE_TEST_CHK_RDR_STATE, RCU_TORTURE_TEST_LOG_CPU, and RCU_TORTURE_TEST_LOG_GP Kconfig options to test the resulting reader-segment dump. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
2025-05-16rcutorture: Fix issue with re-using old images on ARM64Joel Fernandes1-1/+1
On ARM64, when running with --configs '36*SRCU-P', I noticed that only 1 instance instead of 36 for starting. Fix it by checking for Image files, instead of bzImage which ARM does not seem to have. With this I see all 36 instances running at the same time in the batch. Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2025-05-16rcutorture: Remove MAXSMP and CPUMASK_OFFSTACK from TREE01Paul E. McKenney1-2/+0
Back in the day, rcutorture was about the only thing that tested off-stack CPU masks, but now any arm64 system with more than 256 CPUs tests it full time. In fact, it is necessary to hack the kernel to prevent such a system from testing off-stack CPU masks. This means that there is no longer much point in rcutorture going out of its way to test this. And given the differences in how CPUMASK_OFFSTACK is enabled in x86 and arm64, rcutorture would need to go out of its way. This commit therefore removes CONFIG_CPUMASK_OFFSTACK=y (and the CONFIG_MAXSMP=y required to enable it on x86) from TREE01. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2025-05-16rcutorture: Reduce TREE01 CPU overcommitPaul E. McKenney1-1/+1
The TREE01.boot nr_cpus kernel boot parameter has been set to 43 for more than seven years, but it can cause RCU CPU stall warnings on arm64, most of the time involving the stop-machine subsystem. This should not be too surprising, given that this causes 43 vCPUs to spin with interrupts disabled when there are only eight physical CPUs. The point of this CPU overcommit is to test the ability of expedited RCU grace period initialization to handle races with incoming CPUs that have never previously been online. But limiting to 17 CPUs instead of 43 allows time for this code to be exercised, and eliminates (or at least greatly reduces) the incidence of RCU CPU stall warnings on arm64. So this commit therefore sets nr_cpus=17 in TREE01.boot. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2025-05-16torture: Check for "Call trace:" as well as "Call Trace:"Paul E. McKenney2-2/+2
Different architectures capitalize their splats differently. Who knew? This commit therefore checks for both arm64 "Call trace:" and x86 "Call Trace:". Reported-by: Joel Fernandes <joelagnelf@nvidia.com> Closes: https://lore.kernel.org/all/553c33d8-2b51-4772-8aef-97b0163bc78e@nvidia.com/ Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2025-05-16torture: Add testing of RCU's Rust bindings to torture.shPaul E. McKenney1-0/+45
This commit adds a --do-rcu-rust parameter to torture.sh, which invokes a rust_doctests_kernel kunit run. Note that kunit wants a clean source tree, so this runs "make mrproper", which might come as a surprise to some users. Should there be a --mrproper parameter to torture.sh to make the user explicitly ask for it? Co-developed-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2025-05-16torture: Add --do-{,no-}normal to torture.shPaul E. McKenney1-3/+27
Right now, torture.sh runs normal runs unconditionally, which can be slow and thus annoying when you only want to test --kcsan or --kasan runs. This commit therefore adds a --do-normal argument so that "--kcsan --do-no-kasan --do-no-normal" runs only KCSAN runs. Note that specifying "--do-no-kasan --do-no-kcsan --do-no-normal" gets normal runs, so you should not try to use this as a synonym for --do-none. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>