Messages in this thread | | | Date | Fri, 2 Feb 2018 14:11:23 -0800 | From | Eric Biggers <> | Subject | Re: WARNING in register_lock_class |
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On Sat, Dec 23, 2017 at 06:09:01AM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 6084b576dca2e898f5c101baef151f7bfdbb606d > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > WARNING: CPU: 0 PID: 13098 at kernel/locking/lockdep.c:718 > arch_local_save_flags kernel/locking/lockdep.c:687 [inline] > WARNING: CPU: 0 PID: 13098 at kernel/locking/lockdep.c:718 > look_up_lock_class kernel/locking/lockdep.c:709 [inline] > WARNING: CPU: 0 PID: 13098 at kernel/locking/lockdep.c:718 > register_lock_class+0x5a2/0x5d0 kernel/locking/lockdep.c:740 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 13098 Comm: syzkaller182681 Not tainted > 4.15.0-rc3-next-20171214+ #67 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0xe9/0x14b lib/dump_stack.c:53 > panic+0x10e/0x2f8 kernel/panic.c:183 > __warn+0x14e/0x150 kernel/panic.c:547 > report_bug+0x11e/0x1a0 lib/bug.c:184 > fixup_bug.part.11+0x17/0x30 arch/x86/kernel/traps.c:177 > fixup_bug arch/x86/kernel/traps.c:246 [inline] > do_error_trap+0x14a/0x180 arch/x86/kernel/traps.c:295 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 > invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079 > RIP: 0010:arch_local_save_flags kernel/locking/lockdep.c:687 [inline] > RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:709 [inline] > RIP: 0010:register_lock_class+0x5a2/0x5d0 kernel/locking/lockdep.c:740 > RSP: 0018:ffffc90001e2fb38 EFLAGS: 00010086 > RAX: 0000000000000000 RBX: ffffffff83b1e790 RCX: 0000000000000000 > RDX: ffffffff83ff0bb0 RSI: 00000000000002b0 RDI: 0000000000000000 > RBP: ffffc90001e2fba0 R08: 0000000000000000 R09: ffffffff8121b4f4 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: ffff88021388a4b8 R15: 0000000000000000 > __lock_acquire+0xb4/0x1430 kernel/locking/lockdep.c:3314 > lock_acquire+0xbf/0x220 kernel/locking/lockdep.c:3914 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:152 > remove_wait_queue+0x14/0x60 kernel/sched/wait.c:50 > ep_remove_wait_queue fs/eventpoll.c:595 [inline] > ep_unregister_pollwait.isra.7+0x79/0x1f0 fs/eventpoll.c:613 > ep_free+0x71/0x140 fs/eventpoll.c:830 > ep_eventpoll_release+0x26/0x30 fs/eventpoll.c:862 > __fput+0x120/0x270 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0xa3/0xe0 kernel/task_work.c:113 > exit_task_work include/linux/task_work.h:22 [inline] > do_exit+0x3e6/0x1050 kernel/exit.c:869 > do_group_exit+0x60/0x100 kernel/exit.c:972 > SYSC_exit_group kernel/exit.c:983 [inline] > SyS_exit_group+0x18/0x20 kernel/exit.c:981 > entry_SYSCALL_64_fastpath+0x1f/0x96 > RIP: 0033:0x446259 > RSP: 002b:00000000007efa18 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000446259 > RDX: 0000000000446259 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000665e > R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000026e9 > R13: 000000000000665e R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com> > > syzbot will keep track of this bug report. > Once a fix for this bug is merged into any tree, reply to this email with: > #syz fix: exact-commit-title
Fixed by commit f5cb779ba163:
#syz fix: ANDROID: binder: remove waitqueue when thread exits.
- Eric
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