syzbot


BUG: corrupted list in remove_wait_queue

Status: fixed on 2018/04/06 16:37
Subsystems: kvm net virt
[Documentation on labels]
Reported-by: syzbot+c0272972b01b872e604a@syzkaller.appspotmail.com
Fix commit: dc6455a71c7f vhost: correctly remove wait queue during poll failure
First crash: 2224d, last: 2220d
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 4.9 000/310] 4.9.94-stable review 325 (325) 2018/07/12 06:27
[PATCH 4.4 000/190] 4.4.128-stable review 216 (216) 2018/05/17 21:08
[PATCH 3.18 000/121] 3.18.105-stable review 128 (128) 2018/04/12 16:54
[PATCH 4.15 000/168] 4.15.17-stable review 174 (174) 2018/04/11 19:33
[PATCH 4.14 000/138] 4.14.34-stable review 148 (148) 2018/04/11 19:19
[PATCH net V2] vhost: correctly remove wait queue during poll failure 6 (6) 2018/03/29 08:01
[PATCH net] vhost: correctly remove wait queue during poll failure 4 (4) 2018/03/27 13:58
BUG: corrupted list in remove_wait_queue 1 (4) 2018/03/27 03:36
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 BUG: corrupted list in remove_wait_queue C 31139 412d 1838d 0/1 upstream: reported C repro on 2019/04/10 16:06

Sample crash report:
list_del corruption, 0000000054a89bb5->next is LIST_POISON1 (00000000a63e4a19)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4851 Comm: syzkaller762396 Not tainted 4.16.0-rc6+ #364
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45
RSP: 0018:ffff8801d3ff71b8 EFLAGS: 00010086
RAX: 000000000000004e RBX: dead000000000200 RCX: 0000000000000000
RDX: 000000000000004e RSI: 1ffff1003a7fedec RDI: ffffed003a7fee2b
RBP: ffff8801d3ff71d0 R08: ffff8801db227fc0 R09: 1ffff1003a7fed93
R10: ffff8801d3ff7090 R11: 0000000000000002 R12: dead000000000100
R13: ffff8801b6a2d458 R14: ffff8801b6a2d460 R15: ffff8801d27d1780
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002001d000 CR3: 0000000006e22002 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 __remove_wait_queue include/linux/wait.h:184 [inline]
 remove_wait_queue+0x90/0x350 kernel/sched/wait.c:51
 vhost_poll_stop+0x46/0x90 drivers/vhost/vhost.c:229
 vhost_net_disable_vq drivers/vhost/net.c:405 [inline]
 vhost_net_stop_vq+0x90/0x120 drivers/vhost/net.c:973
 vhost_net_stop drivers/vhost/net.c:984 [inline]
 vhost_net_release+0x49/0x190 drivers/vhost/net.c:1017
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x44a8e9
RSP: 002b:00007f7ec8480da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00000000006e29e4 RCX: 000000000044a8e9
RDX: 0000000020000340 RSI: 00000000400454ca RDI: 0000000000000005
RBP: 00000000006e29e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 6f68762f7665642f
R13: 6475612f7665642f R14: 74656e2f7665642f R15: 0000000000000001
Code: 8f 00 00 00 49 8b 54 24 08 48 39 f2 75 3b 48 83 c4 08 b8 01 00 00 00 5b 41 5c 5d c3 4c 89 e2 48 c7 c7 00 80 40 86 e8 85 df fb fe <0f> 0b 48 c7 c7 60 80 40 86 e8 77 df fb fe 0f 0b 48 c7 c7 c0 80 
RIP: __list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45 RSP: ffff8801d3ff71b8
---[ end trace bdcbea47fcda73ff ]---

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/03/24 12:31 upstream 99fec39e7725 2e9d9054 .config console log report syz C ci-upstream-kasan-gce
2018/03/24 12:11 upstream 99fec39e7725 2e9d9054 .config console log report syz ci-upstream-kasan-gce-386
2018/03/21 05:34 upstream 3215b9d57a2c 113a43ff .config console log report ci-upstream-kasan-gce
2018/03/24 13:37 upstream 99fec39e7725 2e9d9054 .config console log report ci-upstream-kasan-gce-386
2018/03/24 11:51 upstream 99fec39e7725 2e9d9054 .config console log report ci-upstream-kasan-gce-386
* Struck through repros no longer work on HEAD.