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Date: Sun, 21 Jul 2013 15:14:29 +0300 From: Gleb Natapov <gleb@...hat.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org Subject: Re: module unloading hangs after using ftrace with 3.11.0-rc1 On Sun, Jul 21, 2013 at 02:52:16PM +0300, Gleb Natapov wrote: > Hi Steven, > > After tracing KVM using trace-cmd with kvm trace points enables I tried > to unload kvm modules and rmmod hanged in tracing_reset_all_online_cpus: > > [ 1234.665038] rmmod D 00000000ffffffff 0 7819 7664 0x00000000 > [ 1234.665038] ffff880129661d38 0000000000000086 ffff880374c7b4d0 ffff880129661fd8 > [ 1234.665038] 0000000000004000 0000000000012a40 ffff88017af63180 ffff880179fe3180 > [ 1234.665038] ffff880129661c78 ffffffff810ad4f9 0000000000000008 0000000000000002 > [ 1234.665038] Call Trace: > [ 1234.665038] [<ffffffff810ad4f9>] ? rcu_is_cpu_idle+0x38/0x57 > [ 1234.665038] [<ffffffff81139e51>] ? d_set_d_op+0xb5/0xb5 > [ 1234.665038] [<ffffffff813afbcc>] schedule+0x64/0x66 > [ 1234.665038] [<ffffffff813afe9a>] schedule_preempt_disabled+0x18/0x24 > [ 1234.665038] [<ffffffff813ae900>] __mutex_lock_slowpath+0x156/0x1c2 > [ 1234.665038] [<ffffffff813adbad>] mutex_lock+0x18/0x29 > [ 1234.665038] [<ffffffff810bfaad>] tracing_reset_all_online_cpus+0x12/0x49 > [ 1234.665038] [<ffffffff810cd105>] trace_module_notify+0x27b/0x2a2 > [ 1234.665038] [<ffffffff81060aab>] notifier_call_chain+0x37/0x63 > [ 1234.665038] [<ffffffff81060be9>] __blocking_notifier_call_chain+0x4b/0x60 > [ 1234.665038] [<ffffffff81060c12>] blocking_notifier_call_chain+0x14/0x16 > [ 1234.665038] [<ffffffff8108cf62>] SyS_delete_module+0x228/0x274 > [ 1234.665038] [<ffffffff813b1d82>] system_call_fastpath+0x16/0x1b > > I haven't verified how reproducible this is yet. > Happens every time. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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