linux/kernel/torture.c, branch v4.8

torture: Stop onoff task if there is only one cpu

2016-06-14T23:03:28Z

If the whole system has only one cpu, that cpu won't be able to be offlined, so there is no need onoff task is stil running. Signed-off-by: Boqun Feng Signed-off-by: Paul E. McKenney

torture: Break online and offline functions out of torture_onoff()

2016-06-14T23:02:16Z

This commit breaks torture_online() and torture_offline() out of torture_onoff() in preparation for allowing waketorture finer-grained control of its CPU-hotplug workload. Signed-off-by: Paul E. McKenney

rcutorture: Dump trace buffer upon shutdown

2016-04-21T20:47:04Z

When running from the scripts, rcutorture is completely headless, so there is no way to to manually dump the trace buffer. This commit therefore unconditionally dumps the trace buffer upon timed shutdown. However, if you are using rmmod to end the test, it is still up to you to manually dump the trace buffer. Signed-off-by: Paul E. McKenney

torture: Clarify refusal to run more than one torture test

2016-03-31T20:39:52Z

This commit clarifies error messages -- you only get to run one torture test at a time! Signed-off-by: Paul E. McKenney

torture: Consolidate cond_resched_rcu_qs() into stutter_wait()

2015-10-06T18:25:01Z

This commit moves cond_resched_rcu_qs() into stutter_wait(), saving a line and also avoiding RCU CPU stall warnings from all torture loops containing a stutter_wait(). Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett

rcu: Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE()

2015-05-27T19:56:15Z

This commit moves from the old ACCESS_ONCE() API to the new READ_ONCE() and WRITE_ONCE() APIs. Signed-off-by: Paul E. McKenney [ paulmck: Updated to include kernel/torture.c as suggested by Jason Low. ]

torture: Address race in module cleanup

2014-09-16T20:41:06Z

When performing module cleanups by calling torture_cleanup() the 'torture_type' string in nullified However, callers are not necessarily done, and might still need to reference the variable. This impacts both rcutorture and locktorture, causing printing things like: [ 94.226618] (null)-torture: Stopping lock_torture_writer task [ 94.226624] (null)-torture: Stopping lock_torture_stats task Thus delay this operation until the very end of the cleanup process. The consequence (which shouldn't matter for this kid of program) is, of course, that we delay the window between rmmod and modprobing, for instance in module_torture_begin(). Signed-off-by: Davidlohr Bueso Signed-off-by: Paul E. McKenney

rcu: Use pr_alert/pr_cont for printing logs

2014-09-07T23:24:47Z

User pr_alert/pr_cont for printing the logs from rcutorture module directly instead of writing it to a buffer and then printing it. This allows us from not having to allocate such buffers. Also remove a resulting empty function. I tested this using the parse-torture.sh script as follows: $ dmesg | grep torture > log.txt $ bash parse-torture.sh log.txt test $ There were no warnings which means that parsing went fine. Signed-off-by: Joe Perches Signed-off-by: Pranith Kumar Signed-off-by: Paul E. McKenney

torture: Avoid format string leak to thead name

2014-07-07T17:12:56Z

Since the torture-test thread creation interface does not include format string arguments, this commit makes sure the name can never be accidentally processed as a format string. Signed-off-by: Kees Cook Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett

torture: Remove __init from torture_init_begin/end

2014-05-14T16:46:30Z

Loading rcutorture as a module (as opposed to building it directly into the kernel) results in the following splat: [Wed Apr 16 15:29:33 2014] BUG: unable to handle kernel paging request at ffffffffa0003000 [Wed Apr 16 15:29:33 2014] IP: [] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] PGD 1c0f067 PUD 1c10063 PMD 378a6067 PTE 0 [Wed Apr 16 15:29:33 2014] Oops: 0010 [#1] SMP [Wed Apr 16 15:29:33 2014] Modules linked in: rcutorture(+) torture [Wed Apr 16 15:29:33 2014] CPU: 0 PID: 4257 Comm: modprobe Not tainted 3.15.0-rc1 #10 [Wed Apr 16 15:29:33 2014] Hardware name: innotek GmbH VirtualBox, BIOS VirtualBox 12/01/2006 [Wed Apr 16 15:29:33 2014] task: ffff8800db1e88d0 ti: ffff8800db25c000 task.ti: ffff8800db25c000 [Wed Apr 16 15:29:33 2014] RIP: 0010:[] [] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP: 0018:ffff8800db25dca0 EFLAGS: 00010282 [Wed Apr 16 15:29:33 2014] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [Wed Apr 16 15:29:33 2014] RDX: ffffffffa00090a8 RSI: 0000000000000001 RDI: ffffffffa0008337 [Wed Apr 16 15:29:33 2014] RBP: ffff8800db25dd50 R08: 0000000000000000 R09: 0000000000000000 [Wed Apr 16 15:29:33 2014] R10: ffffea000357b680 R11: ffffffff8113257a R12: ffffffffa000d000 [Wed Apr 16 15:29:33 2014] R13: ffffffffa00094c0 R14: ffffffffa0009510 R15: 0000000000000001 [Wed Apr 16 15:29:33 2014] FS: 00007fee30ce5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [Wed Apr 16 15:29:33 2014] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 CR3: 00000000d5eb1000 CR4: 00000000000006f0 [Wed Apr 16 15:29:33 2014] Stack: [Wed Apr 16 15:29:33 2014] ffffffffa000d02c 0000000000000000 ffff88021700d400 0000000000000000 [Wed Apr 16 15:29:33 2014] ffff8800db25dd40 ffffffff81647951 ffff8802162bd000 ffff88021541846c [Wed Apr 16 15:29:33 2014] 0000000000000000 ffffffff817dbe2d ffffffff817dbe2d 0000000000000001 [Wed Apr 16 15:29:33 2014] Call Trace: [Wed Apr 16 15:29:33 2014] [] ? rcu_torture_init+0x2c/0x8b4 [rcutorture] [Wed Apr 16 15:29:33 2014] [] ? netlink_broadcast_filtered+0x121/0x3a0 [Wed Apr 16 15:29:33 2014] [] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [] ? trace_module_notify+0x62/0x1d0 [Wed Apr 16 15:29:33 2014] [] ? 0xffffffffa000cfff [Wed Apr 16 15:29:33 2014] [] do_one_initcall+0xfa/0x140 [Wed Apr 16 15:29:33 2014] [] ? __blocking_notifier_call_chain+0x5e/0x80 [Wed Apr 16 15:29:33 2014] [] load_module+0x1931/0x21b0 [Wed Apr 16 15:29:33 2014] [] ? show_initstate+0x50/0x50 [Wed Apr 16 15:29:33 2014] [] SyS_init_module+0x9e/0xc0 [Wed Apr 16 15:29:33 2014] [] system_call_fastpath+0x16/0x1b [Wed Apr 16 15:29:33 2014] Code: Bad RIP value. [Wed Apr 16 15:29:33 2014] RIP [] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 [Wed Apr 16 15:29:33 2014] ---[ end trace 3e88c173037af84b ]--- This splat is due to the fact that torture_init_begin() and torture_init_end() are both marked with __init, despite their use at runtime. This commit therefore removes __init from both functions. Signed-off-by: Pranith Kumar Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett