Re: [Xen-devel] kernel BUG at mm/swapfile.c:2524

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

On 4/27/11 2:16 PM, Konrad Rzeszutek Wilk wrote:
> Ok, I need to be able to reproduce this. How do I do that?
Yeah - if only we knew. We haven't been able to identify any patterns in 
the reports we've been getting.
The problem still exists in 2.6.39:

------------[ cut here ]------------
kernel BUG at mm/swapfile.c:2527!
invalid opcode: 0000 [#1] SMP
last sysfs file: /sys/devices/vbd-51712/block/xvda/removable
Modules linked in:

Pid: 3701, comm: apache2 Not tainted 2.6.39-linode33 #5
EIP: 0061:[<c01a8fb6>] EFLAGS: 00010246 CPU: 0
EIP is at swap_count_continued+0x176/0x180
EAX: f57ba2e3 EBX: ebacd820 ECX: f57ba000 EDX: 00000000
ESI: ebfd81a0 EDI: 00000080 EBP: 000002e3 ESP: cb4d1e1c
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
Process apache2 (pid: 3701, ti=cb4d0000 task=c2407030 task.ti=cb4d0000)
Stack:
 e9c27ec0 000042e3 00000040 00000000 c01a90b1 ce9762d8 e9c27ec0 000042e3
 00000000 c01ab367 ce9762d8 b825b000 cb4d1f04 c019b6b3 72d4e045 80000003
 0229c063 c0103fc5 93563000 00000006 00085c60 ce0cfe40 eb3a9ba0 72d4e045
Call Trace:
 [<c01a90b1>] ? swap_entry_free+0xf1/0x120
 [<c01ab367>] ? free_swap_and_cache+0x27/0xd0
 [<c019b6b3>] ? zap_pte_range+0x1b3/0x480
 [<c0103fc5>] ? pte_pfn_to_mfn+0xb5/0xd0
 [<c019ba91>] ? unmap_page_range+0x111/0x190
 [<c019bc3b>] ? unmap_vmas+0x12b/0x1e0
 [<c019ff01>] ? exit_mmap+0x91/0x140
 [<c013247b>] ? mmput+0x2b/0xc0
 [<c0135d7f>] ? exit_mm+0xef/0x120
 [<c068f4b0>] ? _raw_spin_lock_irq+0x10/0x20
 [<c0137975>] ? do_exit+0x125/0x350
 [<c019fe57>] ? remove_vma+0x37/0x50
 [<c0137bdc>] ? do_group_exit+0x3c/0xa0
 [<c0137c51>] ? sys_exit_group+0x11/0x20
 [<c068f7b1>] ? syscall_call+0x7/0xb
 [<c0680000>] ? sctp_icmp_proto_unreachable+0x20/0xc0
Code: ff 89 d8 e8 ed a7 f7 ff 01 e8 8d 76 00 c6 00 00 ba 01 00 00 00 eb 
b2 89 f8 3c 80 0f 94 c0 e9 b9 fe ff ff 0f 0b eb fe 0f 0b eb fe <0f> 0b 
eb fe 0f 0b eb fe 66 90 83 ec 10 89 1c 24 89 c3 89 74 24
EIP: [<c01a8fb6>] swap_count_continued+0x176/0x180 SS:ESP 0069:cb4d1e1c
---[ end trace 39b6b8ea9add1a97 ]---
Fixing recursive fault but reboot is needed!
BUG: scheduling while atomic: apache2/3701/0x00000001
Modules linked in:
Pid: 3701, comm: apache2 Tainted: G      D     2.6.39-linode33 #5
Call Trace:
 [<c068dade>] ? schedule+0x50e/0x6d0
 [<c013484f>] ? vprintk+0x1af/0x3e0
 [<c0105b17>] ? xen_force_evtchn_callback+0x17/0x30
 [<c0109370>] ? do_coprocessor_segment_overrun+0x80/0x80
 [<c0109370>] ? do_coprocessor_segment_overrun+0x80/0x80
 [<c0137b37>] ? do_exit+0x2e7/0x350
 [<c0109370>] ? do_coprocessor_segment_overrun+0x80/0x80
 [<c0109370>] ? do_coprocessor_segment_overrun+0x80/0x80
 [<c010b7d1>] ? oops_end+0x71/0xa0
 [<c01093ef>] ? do_invalid_op+0x7f/0x90
 [<c01a8fb6>] ? swap_count_continued+0x176/0x180
 [<c0173821>] ? handle_percpu_irq+0x31/0x50
 [<c0105b17>] ? xen_force_evtchn_callback+0x17/0x30
 [<c0139450>] ? __local_bh_enable+0x70/0x70
 [<c01062f4>] ? check_events+0x8/0xc
 [<c01062eb>] ? xen_restore_fl_direct_reloc+0x4/0x4
 [<c010a882>] ? do_softirq+0x42/0xb0
 [<c0139371>] ? irq_exit+0x31/0x90
 [<c044c94d>] ? xen_evtchn_do_upcall+0x1d/0x30
 [<c0103fc5>] ? pte_pfn_to_mfn+0xb5/0xd0
 [<c068fd26>] ? error_code+0x5a/0x60
 [<c012007b>] ? try_preserve_large_page+0x7b/0x340
 [<c0109370>] ? do_coprocessor_segment_overrun+0x80/0x80
 [<c01a8fb6>] ? swap_count_continued+0x176/0x180
 [<c01a90b1>] ? swap_entry_free+0xf1/0x120
 [<c01ab367>] ? free_swap_and_cache+0x27/0xd0
 [<c019b6b3>] ? zap_pte_range+0x1b3/0x480
 [<c0103fc5>] ? pte_pfn_to_mfn+0xb5/0xd0
 [<c019ba91>] ? unmap_page_range+0x111/0x190
 [<c019bc3b>] ? unmap_vmas+0x12b/0x1e0
 [<c019ff01>] ? exit_mmap+0x91/0x140
 [<c013247b>] ? mmput+0x2b/0xc0
 [<c0135d7f>] ? exit_mm+0xef/0x120
 [<c068f4b0>] ? _raw_spin_lock_irq+0x10/0x20
 [<c0137975>] ? do_exit+0x125/0x350
 [<c019fe57>] ? remove_vma+0x37/0x50
 [<c0137bdc>] ? do_group_exit+0x3c/0xa0
 [<c0137c51>] ? sys_exit_group+0x11/0x20
 [<c068f7b1>] ? syscall_call+0x7/0xb
 [<c0680000>] ? sctp_icmp_proto_unreachable+0x20/0xc0

-Chris

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