On Wed, May 28, 2014 at 10:31:38PM -0400, Sasha Levin wrote: > I've just had this: > > > [ 591.111854] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 591.121057] Dumping ftrace buffer: > [ 591.121057] (ftrace buffer empty) > [ 591.121057] Modules linked in: > [ 591.121057] CPU: 14 PID: 10272 Comm: trinity-c230 Tainted: G W > 3.15.0-rc7-next-20140528-sasha-00019-gd193e91-dirty #545 > [ 591.121057] task: ffff8802df0d3000 ti: ffff8802df0fe000 task.ti: > ffff8802df0fe000 > [ 591.129130] RIP: perf_event_exit_task (kernel/events/core.c:7492 > kernel/events/core.c:7524) > [ 591.129130] RSP: 0000:ffff8802df0ffe28 EFLAGS: 00010246 > [ 591.129130] RAX: 0000000000000000 RBX: ffff8802df0d3000 RCX: > 0000000000000001 > [ 591.129130] RDX: 0000000000000000 RSI: ffffffff97088100 RDI: > 0000000000000282 > [ 591.129130] RBP: ffff8802df0ffe98 R08: 0000000000000000 R09: > 0000000000000000 > [ 591.129130] R10: 0000000000000001 R11: 0000000000000000 R12: > 6b6b6b6b6b6b6b6b > [ 591.129130] R13: 6b6b6b6b6b6b6b6b R14: ffff8806c9bfd550 R15: > 0000000000000001 > [ 591.129130] FS: 00007f4b26866700(0000) GS:ffff88036ae00000(0000) > knlGS:0000000000000000 > [ 591.129130] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 591.129130] CR2: 0000000001a3a9f8 CR3: 000000001702c000 CR4: > 00000000000006a0 > [ 591.129130] Stack: > [ 591.129130] ffff8802df0ffe48 ffff8802df09cce0 ffff8802fdf99488 > ffff8802fdf99290 > [ 591.129130] ffff8806c9bfd5a8 ffff8806c9bfd670 ffff8802df0ffe88 > 6b6b6b6b6b6b6b6b > [ 591.129130] ffff8802df0ffe98 0000000000000001 0000000000000001 > ffff8802df0d3000 > [ 591.129130] Call Trace: > [ 591.129130] do_exit (kernel/exit.c:766) > [ 591.129130] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) > [ 591.129130] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2557 > kernel/locking/lockdep.c:2599) > [ 591.129130] ? trace_hardirqs_on (kernel/locking/lockdep.c:2607) > [ 591.129130] do_group_exit (kernel/exit.c:884) > [ 591.129130] SyS_exit_group (kernel/exit.c:895) > [ 591.129130] tracesys (arch/x86/kernel/entry_64.S:542) > [ 591.129130] Code: a0 02 00 00 49 89 95 a8 02 00 00 4c 8b 45 a0 4c 89 c7 e8 > 11 c2 2c 03 48 8b 45 a8 48 89 c7 e8 15 7c ff ff 4c 89 ef e8 bd 7b ff ff <49> > 8b 45 00 48 89 45 c8 4c 8b 6d c8 e8 cc 19 f6 ff 85 c0 74 0e > All code > ======== > 0: a0 02 00 00 49 89 95 movabs 0x2a8958949000002,%al > 7: a8 02 > 9: 00 00 add %al,(%rax) > b: 4c 8b 45 a0 mov -0x60(%rbp),%r8 > f: 4c 89 c7 mov %r8,%rdi > 12: e8 11 c2 2c 03 callq 0x32cc228 > 17: 48 8b 45 a8 mov -0x58(%rbp),%rax > 1b: 48 89 c7 mov %rax,%rdi > 1e: e8 15 7c ff ff callq 0xffffffffffff7c38 > 23: 4c 89 ef mov %r13,%rdi > 26: e8 bd 7b ff ff callq 0xffffffffffff7be8 > 2b:* 49 8b 45 00 mov 0x0(%r13),%rax <-- > trapping instruction > 2f: 48 89 45 c8 mov %rax,-0x38(%rbp) > 33: 4c 8b 6d c8 mov -0x38(%rbp),%r13 > 37: e8 cc 19 f6 ff callq 0xfffffffffff61a08 > 3c: 85 c0 test %eax,%eax > 3e: 74 0e je 0x4e > ... > > Code starting with the faulting instruction > =========================================== > 0: 49 8b 45 00 mov 0x0(%r13),%rax > 4: 48 89 45 c8 mov %rax,-0x38(%rbp) > 8: 4c 8b 6d c8 mov -0x38(%rbp),%r13 > c: e8 cc 19 f6 ff callq 0xfffffffffff619dd > 11: 85 c0 test %eax,%eax > 13: 74 0e je 0x23 > ... > [ 591.129130] RIP perf_event_exit_task (kernel/events/core.c:7492 > kernel/events/core.c:7524) > [ 591.129130] RSP <ffff8802df0ffe28> > > > Seems similar enough.
Shiny, you got the code bits scripted ;-) Yeah, looks about the same, one of the list elements (I checked, its not the list head itself, or at least it wasn't when I managed to hit) was freed while still on the list.
pgpwWSdXJhyDK.pgp
Description: PGP signature
