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Groups > linux.kernel > #1736542
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [LOCKDEP SPLAT 4.14-rc1] Conflict between smpboot thread create completions and get_online_cpus |
| Date | 2017-09-21 13:10 +0200 |
| Message-ID | <us7wL-cK-23@gated-at.bofh.it> (permalink) |
| References | <ur9TY-26E-23@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Sep 18, 2017 at 03:24:59PM -0400, Steven Rostedt wrote: > And adding some debugging where the lockdep splat happened: > > watchdog-27 3.... 764857us : cpus_read_lock+0x5/0xc0: lock cpu > watchdog-27 3.... 764858us : <stack trace> > => x86_release_hardware+0x8f/0xa0 > => hw_perf_event_destroy+0xe/0x20 > => _free_event+0xca/0x3d0 > => put_event+0x14/0x20 > => perf_event_release_kernel+0x236/0x330 > => watchdog_nmi_disable+0x49/0x70 > => watchdog_disable+0x4d/0x60 > => smpboot_thread_fn+0x138/0x280 > => kthread+0x152/0x190 > => ret_from_fork+0x2a/0x40 > watchdog-27 3.... 764917us : cpus_read_unlock+0x5/0xa0: unlock cpu > watchdog-27 3d..1 764918us : lock_commit_crosslock+0xc1/0x5b0: xhlock=132 Yeah, known issue. Thomas has already been prodding at the watchdog stuff.
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[LOCKDEP SPLAT 4.14-rc1] Conflict between smpboot thread create completions and get_online_cpus Steven Rostedt <rostedt@goodmis.org> - 2017-09-18 21:30 +0200 Re: [LOCKDEP SPLAT 4.14-rc1] Conflict between smpboot thread create completions and get_online_cpus Peter Zijlstra <peterz@infradead.org> - 2017-09-21 13:10 +0200
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