syzbot


WARNING: locking bug in try_to_grab_pending

Status: fixed on 2020/08/18 12:30
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+2b713236b28823cd4dff@syzkaller.appspotmail.com
Fix commit: 1378817486d6 tipc: block BH before using dst_cache
First crash: 1752d, last: 1288d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 1378817486d6860f6a927f573491afe65287abf1
Author: Eric Dumazet <edumazet@google.com>
Date: Thu May 21 18:29:58 2020 +0000

  tipc: block BH before using dst_cache

  
Discussions (3)
Title Replies (including bot) Last reply
WARNING: locking bug in try_to_grab_pending 1 (3) 2020/08/14 15:05
Reminder: 99 open syzbot bugs in net subsystem 14 (14) 2019/07/31 15:13
Reminder: 94 open syzbot bugs in net subsystem 1 (1) 2019/06/25 05:48
Fix bisection attempts (8)
Created Duration User Patch Repo Result
2020/08/14 07:52 5h23m bisect fix net-next-old job log (1)
2020/05/21 06:13 26m bisect fix net-next-old job log (0) log
2020/04/21 05:46 26m bisect fix net-next-old job log (0) log
2020/03/22 05:08 25m bisect fix net-next-old job log (0) log
2020/01/27 22:04 25m bisect fix net-next-old job log (0) log
2019/12/18 17:21 24m bisect fix net-next-old job log (0) log
2019/11/09 00:40 26m bisect fix net-next-old job log (0) log
2019/08/19 03:33 26m bisect fix net-next-old job log (0) log

Sample crash report:
Started in network mode
Own node identity 7f000001, cluster identity 4711
Enabled bearer <udp:syz0>, priority 10
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)
WARNING: CPU: 1 PID: 3476 at kernel/locking/lockdep.c:3315 __lock_acquire+0x13bf/0x4700 kernel/locking/lockdep.c:3315
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 3476 Comm: kworker/1:2 Not tainted 5.0.0-rc5+ #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue:  addrconf_dad_work (ipv6_addrconf)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__lock_acquire+0x13bf/0x4700 kernel/locking/lockdep.c:3315
Code: 8b 1d e9 c7 05 08 45 85 db 0f 85 d6 f4 ff ff 48 c7 c6 a0 a4 6b 87 48 c7 c7 00 79 6b 87 44 89 9c 24 98 00 00 00 e8 3f 2f ec ff <0f> 0b 44 8b 9c 24 98 00 00 00 e9 af f4 ff ff 8b 3d 5c 7a fe 08 85
RSP: 0018:ffff88809b5478b0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 00000000005e00a8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815a8f66 RDI: ffffed10136a8f08
RBP: ffff88809b547a78 R08: ffff88809b58e680 R09: fffffbfff1133341
R10: fffffbfff1133340 R11: ffffffff88999a03 R12: ffff88809b58efb8
R13: ffff88809b58efc2 R14: 00000000005e00a8 R15: ffff88809b58e680
 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
 spin_lock include/linux/spinlock.h:329 [inline]
 try_to_grab_pending+0x129/0x710 kernel/workqueue.c:1259
 __cancel_work kernel/workqueue.c:3115 [inline]
 cancel_delayed_work+0x82/0x2d0 kernel/workqueue.c:3144
 addrconf_del_dad_work+0x1c/0x50 net/ipv6/addrconf.c:312
 addrconf_dad_stop+0x129/0x2e0 net/ipv6/addrconf.c:2040
 addrconf_dad_begin net/ipv6/addrconf.c:3973 [inline]
 addrconf_dad_work+0xdbf/0x1150 net/ipv6/addrconf.c:4062
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/02/13 00:06 net-next-old 6663cf821c13 6ecc6d0f .config console log report syz ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.