Kernel crash in sysrq_handle_crash
Issue
- My box crashed and had the following backtrace:
PID: 6837 TASK: ffff880037862040 CPU: 0 COMMAND: "bash"
#0 [ffff88003dcf59e0] machine_kexec at ffffffff81038f3b
#1 [ffff88003dcf5a40] crash_kexec at ffffffff810c5d92
#2 [ffff88003dcf5b10] oops_end at ffffffff8152b510
#3 [ffff88003dcf5b40] no_context at ffffffff8104a00b
#4 [ffff88003dcf5b90] __bad_area_nosemaphore at ffffffff8104a295
#5 [ffff88003dcf5be0] bad_area at ffffffff8104a3be
#6 [ffff88003dcf5c10] __do_page_fault at ffffffff8104ab6f
#7 [ffff88003dcf5d30] do_page_fault at ffffffff8152d45e
#8 [ffff88003dcf5d60] page_fault at ffffffff8152a815
[exception RIP: sysrq_handle_crash+22]
RIP: ffffffff8134b6c6 RSP: ffff88003dcf5e18 RFLAGS: 00010096
RAX: 0000000000000010 RBX: 0000000000000063 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000063
RBP: ffff88003dcf5e18 R8: 0000000000000000 R9: ffffffff81645da0
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff81b01a40 R14: 0000000000000286 R15: 0000000000000004
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff88003dcf5e20] __handle_sysrq at ffffffff8134b982
#10 [ffff88003dcf5e70] write_sysrq_trigger at ffffffff8134ba3e
#11 [ffff88003dcf5ea0] proc_reg_write at ffffffff811f328e
#12 [ffff88003dcf5ef0] vfs_write at ffffffff81188f78
#13 [ffff88003dcf5f30] sys_write at ffffffff81189871
#14 [ffff88003dcf5f80] system_call_fastpath at ffffffff8100b072
RIP: 000000388d4db790 RSP: 00007fff44365340 RFLAGS: 00010206
RAX: 0000000000000001 RBX: ffffffff8100b072 RCX: 0000000000000400
RDX: 0000000000000002 RSI: 00007fe4a40ee000 RDI: 0000000000000001
RBP: 00007fe4a40ee000 R8: 000000000000000a R9: 00007fe4a40de700
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000388d78e780 R14: 0000000000000002 R15: 000000388d78e780
ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b
- I also see this in the log:
Pid: 6837, comm: bash Not tainted 2.6.32-431.el6.x86_64 #1 Red Hat KVM
RIP: 0010:[<ffffffff8134b6c6>] [<ffffffff8134b6c6>] sysrq_handle_crash+0x16/0x20
RSP: 0018:ffff88003dcf5e18 EFLAGS: 00010096
RAX: 0000000000000010 RBX: 0000000000000063 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000063
RBP: ffff88003dcf5e18 R08: 0000000000000000 R09: ffffffff81645da0
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff81b01a40 R14: 0000000000000286 R15: 0000000000000004
FS: 00007fe4a40de700(0000) GS:ffff880002200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003e29a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process bash (pid: 6837, threadinfo ffff88003dcf4000, task ffff880037862040)
Stack:
ffff88003dcf5e68 ffffffff8134b982 ffff880037a508c0 ffff880000000000
<d> 0000000000000300 0000000000000002 ffff88003e0cabc0 00007fe4a40ee000
<d> 0000000000000002 fffffffffffffffb ffff88003dcf5e98 ffffffff8134ba3e
Call Trace:
[<ffffffff8134b982>] __handle_sysrq+0x132/0x1a0
[<ffffffff8134ba3e>] write_sysrq_trigger+0x4e/0x50
[<ffffffff811f328e>] proc_reg_write+0x7e/0xc0
[<ffffffff81188f78>] vfs_write+0xb8/0x1a0
[<ffffffff81189871>] sys_write+0x51/0x90
[<ffffffff810e1e5e>] ? __audit_syscall_exit+0x25e/0x290
[<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Code: d0 88 81 a3 1c fe 81 c9 c3 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 0f 1f 44 00 00 c7 05 0d 07 75 00 01 00 00 00 0f ae f8 <c6> 04 25 00 00 00 00 01 c9 c3 55 48 89 e5 0f 1f 44 00 00 8d 47
RIP [<ffffffff8134b6c6>] sysrq_handle_crash+0x16/0x20
RSP <ffff88003dcf5e18>
CR2: 0000000000000000
Environment
- Red Hat Enterprise Linux 6.5
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
