[info] Using makefile-style concurrent boot in runlevel 2. [ 26.642594] audit: type=1800 audit(1543817975.189:21): pid=5831 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 Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 74.045576] ------------[ cut here ]------------ [ 74.050416] DEBUG_LOCKS_WARN_ON(depth <= 0) [ 74.050481] WARNING: CPU: 0 PID: 6445 at kernel/locking/lockdep.c:3595 lock_release+0x740/0xa10 [ 74.063595] Kernel panic - not syncing: panic_on_warn set ... [ 74.069528] CPU: 0 PID: 6445 Comm: syz-executor323 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 74.078272] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.087742] Call Trace: [ 74.090314] dump_stack+0x244/0x39d [ 74.093920] ? dump_stack_print_info.cold.1+0x20/0x20 [ 74.099104] panic+0x2ad/0x55c [ 74.102630] ? add_taint.cold.5+0x16/0x16 [ 74.106772] ? __warn.cold.8+0x5/0x45 [ 74.110548] ? __warn+0xe8/0x1d0 [ 74.113893] ? lock_release+0x740/0xa10 [ 74.117847] __warn.cold.8+0x20/0x45 [ 74.121542] ? lock_release+0x740/0xa10 [ 74.125497] report_bug+0x254/0x2d0 [ 74.129111] do_error_trap+0x11b/0x200 [ 74.133012] do_invalid_op+0x36/0x40 [ 74.136829] ? lock_release+0x740/0xa10 [ 74.140802] invalid_op+0x14/0x20 [ 74.144254] RIP: 0010:lock_release+0x740/0xa10 [ 74.148833] 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 [ 74.167985] RSP: 0018:ffff8801b7937868 EFLAGS: 00010086 [ 74.173326] RAX: 0000000000000000 RBX: 1ffff10036f26f12 RCX: 0000000000000000 [ 74.180570] RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000006 [ 74.187966] RBP: ffff8801b7937998 R08: ffff8801b78ba140 R09: fffffbfff12b2254 [ 74.195310] R10: fffffbfff12b2254 R11: ffffffff895912a3 R12: ffffffff8b0e27a0 [ 74.202561] R13: ffff8801b7937970 R14: ffff8801b78ba140 R15: ffff8801b79378b0 [ 74.209945] ? vprintk_func+0x85/0x181 [ 74.213812] ? lock_release+0x740/0xa10 [ 74.217773] ? loop_control_ioctl+0xf5/0x4e0 [ 74.222162] ? lock_downgrade+0x900/0x900 [ 74.226286] ? __radix_tree_lookup+0x3a7/0x500 [ 74.230956] ? radix_tree_insert+0x870/0x870 [ 74.235342] ? find_held_lock+0x36/0x1c0 [ 74.239578] __mutex_unlock_slowpath+0x102/0x8c0 [ 74.244317] ? __fget+0x4aa/0x740 [ 74.247746] ? wait_for_completion+0x8a0/0x8a0 [ 74.252304] ? check_preemption_disabled+0x48/0x280 [ 74.257296] ? radix_tree_lookup+0x21/0x30 [ 74.261534] ? idr_find+0x44/0x50 [ 74.264987] ? loop_lookup+0x105/0x230 [ 74.268900] ? loop_exit_cb+0x20/0x20 [ 74.272724] mutex_unlock+0xd/0x10 [ 74.276245] loop_control_ioctl+0xf5/0x4e0 [ 74.280474] ? loop_add+0xa20/0xa20 [ 74.284083] ? trace_hardirqs_off+0xb8/0x310 [ 74.288474] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.293993] ? loop_add+0xa20/0xa20 [ 74.297603] do_vfs_ioctl+0x1de/0x1790 [ 74.301491] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 74.307017] ? ioctl_preallocate+0x300/0x300 [ 74.311420] ? __fget_light+0x2e9/0x430 [ 74.315474] ? fget_raw+0x20/0x20 [ 74.318907] ? putname+0xf2/0x130 [ 74.322442] ? rcu_read_lock_sched_held+0x14f/0x180 [ 74.327441] ? kmem_cache_free+0x24f/0x290 [ 74.331655] ? __x64_sys_futex+0x47f/0x6a0 [ 74.335869] ? do_syscall_64+0x9a/0x820 [ 74.339823] ? do_syscall_64+0x9a/0x820 [ 74.343782] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 74.348349] ? security_file_ioctl+0x94/0xc0 [ 74.352742] ksys_ioctl+0xa9/0xd0 [ 74.356199] __x64_sys_ioctl+0x73/0xb0 [ 74.360135] do_syscall_64+0x1b9/0x820 [ 74.364026] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 74.369483] ? syscall_return_slowpath+0x5e0/0x5e0 [ 74.374398] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 74.379227] ? trace_hardirqs_on_caller+0x310/0x310 [ 74.384228] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 74.389223] ? prepare_exit_to_usermode+0x291/0x3b0 [ 74.394221] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 74.399056] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.404227] RIP: 0033:0x446849 [ 74.407408] Code: e8 ac ba 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 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 74.426294] RSP: 002b:00007f19459c8ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 74.433983] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446849 [ 74.441230] RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003 [ 74.448481] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 74.455732] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c [ 74.462993] R13: 00007ffdd7d8cbaf R14: 00007f19459c99c0 R15: 00000000006dcd2c [ 74.471319] Kernel Offset: disabled [ 74.474937] Rebooting in 86400 seconds..