syzbot


WARNING in __mutex_unlock_slowpath

Status: fixed on 2018/06/07 13:52
Subsystems: kvm
[Documentation on labels]
Reported-by: syzbot+35666cba7f0a337e2e79@syzkaller.appspotmail.com
Fix commit: 7a4deea1aa8b idr: fix invalid ptr dereference on item delete
First crash: 2267d, last: 2263d
Discussions (5)
Title Replies (including bot) Last reply
[PATCH 4.16 000/272] 4.16.13-stable review 274 (274) 2018/06/07 07:25
[PATCH 4.14 000/496] 4.14.45-stable review 478 (478) 2018/05/29 19:52
Re: [PATCH] idr: fix invalid ptr dereference on item delete 8 (8) 2018/05/21 19:13
[PATCH] idr: fix invalid ptr dereference on item delete 6 (6) 2018/05/18 20:29
WARNING in __mutex_unlock_slowpath 6 (7) 2018/05/08 16:41

Sample crash report:
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(__owner_task(owner) != current)
WARNING: CPU: 0 PID: 4525 at kernel/locking/mutex.c:1032 __mutex_unlock_slowpath+0x62e/0x8a0 kernel/locking/mutex.c:1032
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4525 Comm: syz-executor809 Not tainted 4.17.0-rc2+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:__mutex_unlock_slowpath+0x62e/0x8a0 kernel/locking/mutex.c:1032
RSP: 0018:ffff8801cf31f138 EFLAGS: 00010286
RAX: 0000000000000033 RBX: 1ffff10039e63e30 RCX: ffffffff8160b82d
RDX: 0000000000000000 RSI: ffffffff816104e1 RDI: 0000000000000001
RBP: ffff8801cf31f2a8 R08: ffff8801d9042180 R09: fffffbfff11b0974
R10: fffffbfff11b0974 R11: ffffffff88d84ba3 R12: ffffffff8a713a20
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801989d6b08
 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:614
 kvm_hv_eventfd_deassign arch/x86/kvm/hyperv.c:1434 [inline]
 kvm_vm_ioctl_hv_eventfd+0x1ea/0x24b arch/x86/kvm/hyperv.c:1451
 kvm_arch_vm_ioctl+0x155e/0x2690 arch/x86/kvm/x86.c:4563
 kvm_vm_ioctl+0x246/0x1d90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3100
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4401f9
RSP: 002b:00007ffcd5727a48 EFLAGS: 00000217 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 6d766b2f7665642f RCX: 00000000004401f9
RDX: 0000000020000140 RSI: 000000004018aebd RDI: 00000000000000ee
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401720
R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/29 04:51 upstream bf8f5de17442 d5a5d045 .config console log report syz C ci-upstream-kasan-gce-root
2018/05/02 08:09 upstream f2125992e7cb d5b114b4 .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.