20.02.2013 14:03, Gleb Natapov пишет:
On Wed, Feb 20, 2013 at 12:23:22PM +0400, Stanislav Kinsbursky wrote:
19.02.2013 22:04, Dave Jones пишет:
general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: can af_rxrpc binfmt_misc scsi_transport_iscsi ax25 ipt_ULOG
decnet nfc appletalk x25 rds ipx p8023 psnap p8022 llc irda crc_ccitt atm lockd
sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack
ip6table_filter ip6_tables btusb bluetooth snd_hda_codec_realtek snd_hda_intel
snd_hda_codec snd_pcm edac_core snd_page_alloc snd_timer microcode rfkill
usb_debug serio_raw pcspkr snd soundcore vhost_net r8169 mii tun macvtap
macvlan kvm_amd kvm
CPU 2
Pid: 887, comm: trinity-child2 Not tainted 3.8.0+ #57 Gigabyte Technology Co.,
Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff812aebba>] [<ffffffff812aebba>] do_msgrcv+0x22a/0x670
RSP: 0018:ffff88011892be88 EFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000004000
RDX: 000000007adea6f6 RSI: 6b6b6b6b6b6b6b6b RDI: ffff8801189ffb60
RBP: ffff88011892bf68 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801189ffc10 R14: ffff8801189ffb60 R15: 6b6b6b6b6b6b6b6b
FS: 00007f681e955740(0000) GS:ffff88012f200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f681e846064 CR3: 000000012553d000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child2 (pid: 887, threadinfo ffff88011892a000, task
ffff88010bc82490)
Stack:
ffff88011892beb8 ffff88010bc82490 ffff88010bc82490 ffff88010bc82490
ffff8801186d8000 ffffffff812ad5f0 0000000001aba000 ffffffff81c688c0
000000007adea6f6 00000000001fffff 0000400046a9467e 6b6b6b6b6b6b6b6b
Call Trace:
[<ffffffff812ad5f0>] ? load_msg+0x180/0x180
[<ffffffff810b8395>] ? trace_hardirqs_on_caller+0x115/0x1a0
[<ffffffff813347be>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff812af015>] sys_msgrcv+0x15/0x20
[<ffffffff816a8482>] system_call_fastpath+0x16/0x1b
Code: 84 14 01 00 00 8b 8d 74 ff ff ff 85 c9 0f 84 52 02 00 00 48 8b 95 60 ff ff ff
48 39 55 80 0f 84 4d 02 00 00 4c 89 bd 78 ff ff ff <4d> 8b 3f 48 ff 45 80 4d 39
ef 75 9a 66 90 48 81 bd 78 ff ff ff
RIP [<ffffffff812aebba>] do_msgrcv+0x22a/0x670
RSP <ffff88011892be88>
---[ end trace d3cc044a84b1d828 ]---
oopsing instruction is..
0: 4d 8b 3f mov (%r15),%r15
Looks like a use-after-free.
Disassembly of ipc/msg.o shows this happens here..
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
1537: 4d 8b be b0 00 00 00 mov 0xb0(%r14),%r15
while (tmp != &msq->q_messages) {
153e: 4d 8d ae b0 00 00 00 lea 0xb0(%r14),%r13
1545: 4d 39 ef cmp %r13,%r15
1548: 0f 84 5f 03 00 00 je 18ad <do_msgrcv+0x50d>
154e: 48 c7 45 80 00 00 00 movq $0x0,-0x80(%rbp)
1555: 00
1556: 48 c7 85 78 ff ff ff movq $0xfffffffffffffff5,-0x88(%rbp)
155d: f5 ff ff ff
1561: eb 0d jmp 1570 <do_msgrcv+0x1d0>
1563: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
}
} else
break;
msg_counter++;
}
tmp = tmp->next;
1568: 4d 8b 3f mov (%r15),%r15
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
while (tmp != &msq->q_messages) {
Looks like Stanislav recently changed this code, so problem was likely
introduced
in those changes.
Hello.
Is it easy to reproduce? Do you use KVM?
Jugging by motherboard name in the OOPs it is not KVM. And since r15 is
6b6b6b6b6b6b6b6b you need DEBUG_PAGEALLOC to reproduce.
Ok, thanks!
--
Best regards,
Stanislav Kinsbursky
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