[info] Using makefile-style concurrent boot in runlevel 2. [ 27.542176] audit: type=1800 audit(1543419541.327:21): pid=5870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.237465] sshd (6008) used greatest stack depth: 15632 bytes left Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. executing program executing program executing program [ 56.397912] ------------[ cut here ]------------ [ 56.402807] DEBUG_LOCKS_WARN_ON(depth <= 0) [ 56.402923] WARNING: CPU: 0 PID: 6035 at kernel/locking/lockdep.c:3595 lock_release+0x740/0xa10 [ 56.416062] Kernel panic - not syncing: panic_on_warn set ... [ 56.421938] CPU: 0 PID: 6035 Comm: syz-executor966 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 56.430576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.439950] Call Trace: [ 56.442538] dump_stack+0x244/0x39d [ 56.446162] ? dump_stack_print_info.cold.1+0x20/0x20 [ 56.451426] panic+0x2ad/0x55c [ 56.454603] ? add_taint.cold.5+0x16/0x16 [ 56.458742] ? __warn.cold.8+0x5/0x45 [ 56.462516] ? __warn+0xe8/0x1d0 [ 56.465880] ? lock_release+0x740/0xa10 [ 56.469859] __warn.cold.8+0x20/0x45 [ 56.473564] ? lock_release+0x740/0xa10 [ 56.477512] report_bug+0x254/0x2d0 [ 56.481126] do_error_trap+0x11b/0x200 [ 56.485040] do_invalid_op+0x36/0x40 [ 56.488746] ? lock_release+0x740/0xa10 [ 56.492707] invalid_op+0x14/0x20 [ 56.496166] RIP: 0010:lock_release+0x740/0xa10 [ 56.500737] Code: 03 38 d0 7c 08 84 d2 0f 85 da 02 00 00 8b 35 a7 95 b3 08 85 f6 75 15 48 c7 c6 20 66 2b 88 48 c7 c7 c0 33 2b 88 e8 10 36 e7 ff <0f> 0b 48 8b 95 e8 fe ff ff 4c 89 f7 48 8b b5 f0 fe ff ff e8 e8 58 [ 56.519724] RSP: 0018:ffff8801bf23f868 EFLAGS: 00010086 [ 56.525071] RAX: 0000000000000000 RBX: 1ffff10037e47f12 RCX: 0000000000000000 [ 56.532321] RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000006 [ 56.539696] RBP: ffff8801bf23f998 R08: ffff8801beff22c0 R09: fffffbfff12b2254 [ 56.546947] R10: fffffbfff12b2254 R11: ffffffff895912a3 R12: ffffffff8b0e27a0 [ 56.554214] R13: ffff8801bf23f970 R14: ffff8801beff22c0 R15: ffff8801bf23f8b0 [ 56.561622] ? vprintk_func+0x85/0x181 [ 56.565498] ? lock_release+0x740/0xa10 [ 56.569489] ? loop_control_ioctl+0xf5/0x4e0 [ 56.573878] ? lock_downgrade+0x900/0x900 [ 56.578137] ? __radix_tree_lookup+0x3a7/0x500 [ 56.582737] ? radix_tree_insert+0x870/0x870 [ 56.587124] ? find_held_lock+0x36/0x1c0 [ 56.591169] __mutex_unlock_slowpath+0x102/0x8c0 [ 56.595914] ? __fget+0x4aa/0x740 [ 56.599350] ? wait_for_completion+0x8a0/0x8a0 [ 56.603918] ? check_preemption_disabled+0x48/0x280 [ 56.608917] ? radix_tree_lookup+0x21/0x30 [ 56.613130] ? idr_find+0x44/0x50 [ 56.616560] ? loop_lookup+0x105/0x230 [ 56.620423] ? loop_exit_cb+0x20/0x20 [ 56.624205] mutex_unlock+0xd/0x10 [ 56.627722] loop_control_ioctl+0xf5/0x4e0 [ 56.631935] ? loop_add+0xa20/0xa20 [ 56.635544] ? trace_hardirqs_off+0xb8/0x310 [ 56.639939] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.645458] ? loop_add+0xa20/0xa20 [ 56.649082] do_vfs_ioctl+0x1de/0x1790 [ 56.652953] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 56.658579] ? ioctl_preallocate+0x300/0x300 [ 56.662971] ? __fget_light+0x2e9/0x430 [ 56.666923] ? fget_raw+0x20/0x20 [ 56.670359] ? putname+0xf2/0x130 [ 56.673793] ? rcu_read_lock_sched_held+0x14f/0x180 [ 56.678788] ? kmem_cache_free+0x24f/0x290 [ 56.683006] ? __x64_sys_futex+0x47f/0x6a0 [ 56.687218] ? do_syscall_64+0x9a/0x820 [ 56.691184] ? do_syscall_64+0x9a/0x820 [ 56.695141] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 56.699720] ? security_file_ioctl+0x94/0xc0 [ 56.704105] ksys_ioctl+0xa9/0xd0 [ 56.707537] __x64_sys_ioctl+0x73/0xb0 [ 56.711454] do_syscall_64+0x1b9/0x820 [ 56.715319] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 56.720658] ? syscall_return_slowpath+0x5e0/0x5e0 [ 56.725562] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.730399] ? trace_hardirqs_on_caller+0x310/0x310 [ 56.735393] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 56.740385] ? prepare_exit_to_usermode+0x291/0x3b0 [ 56.745385] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.750215] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 56.755399] RIP: 0033:0x446239 [ 56.758631] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 56.777610] RSP: 002b:00007f8c45ac8da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 56.785426] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000446239 [ 56.792689] RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003 [ 56.799935] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 56.807192] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c [ 56.814568] R13: 6f72746e6f632d70 R14: 6f6f6c2f7665642f R15: 00000000006dad2c [ 56.822886] Kernel Offset: disabled [ 56.826520] Rebooting in 86400 seconds..