[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.215' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 37.068405] ------------[ cut here ]------------ [ 37.073173] DEBUG_LOCKS_WARN_ON(depth <= 0) [ 37.073233] WARNING: CPU: 1 PID: 8096 at kernel/locking/lockdep.c:3670 lock_release+0x759/0x8b0 [ 37.086352] Kernel panic - not syncing: panic_on_warn set ... [ 37.086352] [ 37.093699] CPU: 1 PID: 8096 Comm: syz-executor317 Not tainted 4.19.211-syzkaller #0 [ 37.101577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.110912] Call Trace: [ 37.113486] dump_stack+0x1fc/0x2ef [ 37.117100] panic+0x26a/0x50e [ 37.120275] ? __warn_printk+0xf3/0xf3 [ 37.124142] ? lock_release+0x759/0x8b0 [ 37.128095] ? __probe_kernel_read+0x130/0x1b0 [ 37.132674] ? __warn.cold+0x5/0x5a [ 37.136293] ? __warn+0xe4/0x200 [ 37.139647] ? lock_release+0x759/0x8b0 [ 37.143608] __warn.cold+0x20/0x5a [ 37.147136] ? lock_release+0x759/0x8b0 [ 37.151093] report_bug+0x262/0x2b0 [ 37.154712] do_error_trap+0x1d7/0x310 [ 37.158583] ? math_error+0x310/0x310 [ 37.162364] ? vprintk_store+0x1f0/0x410 [ 37.166410] ? trace_hardirqs_off+0x64/0x200 [ 37.170798] ? error_entry+0x72/0xd0 [ 37.174497] ? trace_hardirqs_off_caller+0x2c/0x210 [ 37.179494] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.184336] invalid_op+0x14/0x20 [ 37.187778] RIP: 0010:lock_release+0x759/0x8b0 [ 37.192344] Code: e9 3f fd ff ff e8 37 60 05 00 85 c0 0f 85 93 fe ff ff e9 61 0a a8 06 48 c7 c6 60 4b 6a 88 48 c7 c7 40 19 6a 88 e8 0c 6c a7 06 <0f> 0b eb 82 48 89 df e8 0b 11 4d 00 e9 90 fd ff ff e8 01 11 4d 00 [ 37.211316] RSP: 0018:ffff88808fadf888 EFLAGS: 00010082 [ 37.216658] RAX: 0000000000000000 RBX: ffffffff8d243760 RCX: 0000000000000000 [ 37.223905] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1011f5bf03 [ 37.231153] RBP: ffff8880b13b1bd0 R08: 0000000000000000 R09: 00000000000006d9 [ 37.238401] R10: 0000000000000006 R11: ffffffff8c66505b R12: 1ffff11011f5bf14 [ 37.245650] R13: ffffffff875c6aec R14: ffff8880b2408040 R15: 0000000000000000 [ 37.253060] ? rxrpc_do_sendmsg+0x8ac/0x1d50 [ 37.257450] ? vprintk_func+0x81/0x180 [ 37.261342] ? lock_release+0x759/0x8b0 [ 37.265306] ? lock_downgrade+0x720/0x720 [ 37.269443] ? check_preemption_disabled+0x41/0x280 [ 37.274544] __mutex_unlock_slowpath+0x89/0x610 [ 37.279206] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 37.284203] ? wait_for_completion_io+0x10/0x10 [ 37.288869] ? rxrpc_do_sendmsg+0xf42/0x1d50 [ 37.293279] ? rxrpc_put_peer+0x16/0x690 [ 37.297338] rxrpc_do_sendmsg+0x8ac/0x1d50 [ 37.301561] ? rxrpc_kernel_send_data+0x4a0/0x4a0 [ 37.306499] ? mark_held_locks+0xa6/0xf0 [ 37.310550] ? __local_bh_enable_ip+0x159/0x270 [ 37.315204] rxrpc_sendmsg+0x416/0x600 [ 37.319073] ? rxrpc_write_space+0x580/0x580 [ 37.323599] sock_sendmsg+0xc3/0x120 [ 37.327298] ___sys_sendmsg+0x7bb/0x8e0 [ 37.331257] ? copy_msghdr_from_user+0x440/0x440 [ 37.335996] ? do_huge_pmd_anonymous_page+0x935/0x1e60 [ 37.341256] ? __fget+0x32f/0x510 [ 37.344694] ? lock_downgrade+0x720/0x720 [ 37.348830] ? check_preemption_disabled+0x41/0x280 [ 37.353841] ? check_preemption_disabled+0x41/0x280 [ 37.358851] ? __fdget+0x1d0/0x230 [ 37.362372] __x64_sys_sendmsg+0x132/0x220 [ 37.366674] ? __sys_sendmsg+0x1b0/0x1b0 [ 37.370715] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.376060] ? trace_hardirqs_off_caller+0x6e/0x210 [ 37.381057] ? do_syscall_64+0x21/0x620 [ 37.385010] do_syscall_64+0xf9/0x620 [ 37.388793] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.393961] RIP: 0033:0x7fb827393ad9 [ 37.397671] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 37.416551] RSP: 002b:00007fb827345318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 37.424237] RAX: ffffffffffffffda RBX: 00007fb82741b3e8 RCX: 00007fb827393ad9 [ 37.431631] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 [ 37.438884] RBP: 00007fb82741b3e0 R08: 000000000000224e R09: 0000000000000000 [ 37.446141] R10: 0000000000000002 R11: 0000000000000246 R12: 000000d7860cdad7 [ 37.453627] R13: 00007ffc46208fbf R14: 00007fb827345400 R15: 0000000000022000 [ 37.461361] Kernel Offset: disabled [ 37.464980] Rebooting in 86400 seconds..