On 05/05/2014 11:46 AM, Sasha Levin wrote: >>> >> [ 3589.407670] vfs_read (fs/read_write.c:430) >>> >> [ 3589.407670] SyS_read (fs/read_write.c:568 fs/read_write.c:560) >>> >> [ 3589.407670] tracesys (arch/x86/kernel/entry_64.S:746) >>> >> [ 3589.407670] Code: 85 cd 0c 00 00 48 c7 c1 5c e1 6d ac 48 c7 c2 af 89 >>> >> 6d ac 31 c0 be fa 0b 00 00 48 c7 c7 16 e1 6d ac e8 3c 68 f9 ff e9 a7 0c >>> >> 00 00 <49> 81 7d 00 80 81 76 ae b8 00 00 00 00 44 0f 44 c0 eb 07 0f 1f >>> >> [ 3589.407670] RIP __lock_acquire (kernel/locking/lockdep.c:3070 >>> >> (discriminator 1)) >>> >> [ 3589.407670] RSP <ffff88005c9d1c18> >>> >> [ 3589.407670] CR2: 00000000000001f0 >> > >> > Is this easily reproducible? > Nope, only saw it once.
And a second time today, I guess I could put a debug patch and see if that helps, if you had something in mind... [ 1157.707702] BUG: unable to handle kernel NULL pointer dereference at 00000000000001f0 [ 1157.710068] IP: __lock_acquire (kernel/locking/lockdep.c:3070 (discriminator 1)) [ 1157.710068] PGD 243db1067 PUD 25b047067 PMD 0 [ 1157.710068] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 1157.710068] Dumping ftrace buffer: [ 1157.710068] (ftrace buffer empty) [ 1157.710068] Modules linked in: [ 1157.710068] CPU: 14 PID: 30503 Comm: trinity-c247 Tainted: G W 3.15.0-rc4-next-20140507-sasha-00004-g14be78b-dirty #450 [ 1157.710068] task: ffff880002ec0000 ti: ffff880240ec8000 task.ti: ffff880240ec8000 [ 1157.710068] RIP: __lock_acquire (kernel/locking/lockdep.c:3070 (discriminator 1)) [ 1157.710068] RSP: 0000:ffff880240ec9ab8 EFLAGS: 00010002 [ 1157.710068] RAX: 0000000000000086 RBX: ffff880002ec0000 RCX: 0000000000000000 [ 1157.710068] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000001f0 [ 1157.710068] RBP: ffff880240ec9ba8 R08: 0000000000000001 R09: 0000000000000001 [ 1157.710068] R10: ffff880002ec0000 R11: 0000000000000001 R12: 0000000000000000 [ 1157.710068] R13: 00000000000001f0 R14: 0000000000000000 R15: 0000000000000000 [ 1157.710068] FS: 00007f33d790b700(0000) GS:ffff88036ac00000(0000) knlGS:0000000000000000 [ 1157.710068] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 1157.710068] CR2: 00000000000001f0 CR3: 0000000243fb6000 CR4: 00000000000006a0 [ 1157.710068] DR0: 00000000006df000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1157.710068] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 [ 1157.710068] Stack: [ 1157.710068] ffff880240ec9ac8 ffffffffa30be274 ffff880240ec9ad8 ffffffffa307c7e5 [ 1157.710068] ffff880240ec9b08 ffffffffa31a7a05 000000000000000e ffff88036add8380 [ 1157.710068] 00000000001d8380 000000000000000e ffff880240ec9b38 ffffffffa31a7ce8 [ 1157.710068] Call Trace: [ 1157.710068] ? kvm_clock_read (arch/x86/include/asm/preempt.h:90 arch/x86/kernel/kvmclock.c:86) [ 1157.710068] ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305) [ 1157.710068] ? sched_clock_local (kernel/sched/clock.c:214) [ 1157.710068] ? sched_clock_cpu (kernel/sched/clock.c:311) [ 1157.710068] ? __lock_acquire (kernel/locking/lockdep.c:3189) [ 1157.710068] lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602) [ 1157.710068] ? prepare_to_wait (kernel/sched/wait.c:177) [ 1157.710068] ? _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:109 kernel/locking/spinlock.c:159) [ 1157.710068] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159) [ 1157.710068] ? prepare_to_wait (kernel/sched/wait.c:177) [ 1157.710068] ? get_parent_ip (kernel/sched/core.c:2485) [ 1157.710068] ? mutex_unlock (kernel/locking/mutex.c:220) [ 1157.710068] prepare_to_wait (kernel/sched/wait.c:177) [ 1157.710068] ? __mutex_unlock_slowpath (arch/x86/include/asm/paravirt.h:809 kernel/locking/mutex.c:713 kernel/locking/mutex.c:722) [ 1157.710068] ring_buffer_wait (kernel/trace/ring_buffer.c:587) [ 1157.710068] ? bit_waitqueue (kernel/sched/wait.c:291) [ 1157.710068] wait_on_pipe (kernel/trace/trace.c:1095) [ 1157.710068] tracing_wait_pipe.isra.19 (kernel/trace/trace.c:4235) [ 1157.710068] tracing_read_pipe (kernel/trace/trace.c:4281) [ 1157.710068] ? tracing_splice_read_pipe (kernel/trace/trace.c:4250) [ 1157.710068] do_loop_readv_writev (fs/read_write.c:708) [ 1157.710068] ? tracing_splice_read_pipe (kernel/trace/trace.c:4250) [ 1157.710068] compat_do_readv_writev (fs/read_write.c:1020) [ 1157.710068] ? get_parent_ip (kernel/sched/core.c:2485) [ 1157.710068] ? mutex_lock_nested (arch/x86/include/asm/preempt.h:98 kernel/locking/mutex.c:570 kernel/locking/mutex.c:587) [ 1157.710068] ? __fdget_pos (fs/file.c:714) [ 1157.710068] ? __fdget_pos (fs/file.c:714) [ 1157.710068] ? __fget_light (include/linux/rcupdate.h:428 include/linux/fdtable.h:80 fs/file.c:684) [ 1157.710068] compat_readv (fs/read_write.c:1053) [ 1157.710068] compat_SyS_readv (fs/read_write.c:1071 fs/read_write.c:1061) [ 1157.710068] ia32_do_call (arch/x86/ia32/ia32entry.S:430) [ 1157.710068] Code: 85 cd 0c 00 00 48 c7 c1 d4 12 6e a7 48 c7 c2 2f bb 6d a7 31 c0 be fa 0b 00 00 48 c7 c7 8e 12 6e a7 e8 6c 66 f9 ff e9 a7 0c 00 00 <49> 81 7d 00 40 f8 96 a9 b8 00 00 00 00 44 0f 44 c0 eb 07 0f 1f [ 1157.710068] RIP __lock_acquire (kernel/locking/lockdep.c:3070 (discriminator 1)) [ 1157.710068] RSP <ffff880240ec9ab8> [ 1157.710068] CR2: 00000000000001f0 Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
