Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.14' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 35.729759] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. [ 35.742643] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. executing program [ 35.807457] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. [ 35.816895] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. executing program [ 35.855757] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. [ 35.864863] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. executing program [ 35.905637] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. [ 35.915110] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. executing program [ 35.965536] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. [ 35.975632] netlink: 4 bytes leftover after parsing attributes in process `syz-executor977'. 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 [ 38.439497] ------------[ cut here ]------------ [ 38.447510] refcount_t: underflow; use-after-free. [ 38.453706] WARNING: CPU: 0 PID: 8529 at lib/refcount.c:280 refcount_dec_not_one+0x1bc/0x1d0 [ 38.462298] Kernel panic - not syncing: panic_on_warn set ... [ 38.462298] [ 38.469672] CPU: 0 PID: 8529 Comm: systemd-udevd Not tainted 4.19.184-syzkaller #0 [ 38.477371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.486831] Call Trace: [ 38.489417] dump_stack+0x1fc/0x2ef [ 38.493047] panic+0x26a/0x50e [ 38.496242] ? __warn_printk+0xf3/0xf3 [ 38.500133] ? refcount_dec_not_one+0x1bc/0x1d0 [ 38.504799] ? __probe_kernel_read+0x130/0x1b0 [ 38.509388] ? __warn.cold+0x5/0x5a [ 38.513017] ? __warn+0xe4/0x200 [ 38.516401] ? refcount_dec_not_one+0x1bc/0x1d0 [ 38.521073] __warn.cold+0x20/0x5a [ 38.524606] ? refcount_dec_not_one+0x1bc/0x1d0 [ 38.529277] report_bug+0x262/0x2b0 [ 38.532918] do_error_trap+0x1d7/0x310 [ 38.536842] ? math_error+0x310/0x310 [ 38.540638] ? __irq_work_queue_local+0x101/0x160 [ 38.545523] ? irq_work_queue+0x29/0x80 [ 38.549558] ? error_entry+0x72/0xd0 [ 38.553262] ? trace_hardirqs_off_caller+0x6e/0x210 [ 38.558287] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.563151] invalid_op+0x14/0x20 [ 38.566653] RIP: 0010:refcount_dec_not_one+0x1bc/0x1d0 [ 38.571932] Code: 1d 3f df 98 07 31 ff 89 de e8 70 91 ec fd 84 db 75 89 e8 37 90 ec fd 48 c7 c7 40 b8 b3 88 c6 05 1f df 98 07 01 e8 94 7e 7b 04 <0f> 0b 41 bc 01 00 00 00 e9 6a ff ff ff e8 82 d7 c1 fd 66 90 41 54 [ 38.590975] RSP: 0018:ffff8880909ffbd0 EFLAGS: 00010282 [ 38.596353] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 38.603646] RDX: 0000000000000000 RSI: ffffffff814ddd51 RDI: ffffed101213ff6c [ 38.610923] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 38.618247] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffffff [ 38.625514] R13: 1ffff1101213ff7b R14: ffff8880909ffbf8 R15: ffff8880b247d0e8 [ 38.632794] ? vprintk_func+0x81/0x180 [ 38.636701] ? __mutex_unlock_slowpath+0x2be/0x610 [ 38.641631] ? refcount_dec_and_test_checked+0x20/0x20 [ 38.646919] ? wait_for_completion_io+0x10/0x10 [ 38.651589] refcount_dec_and_mutex_lock+0x1c/0x80 [ 38.656619] nbd_config_put+0x5bb/0x870 [ 38.660590] nbd_release+0xf4/0x170 [ 38.664205] ? nbd_queue_rq+0xe60/0xe60 [ 38.668174] __blkdev_put+0x636/0x870 [ 38.672021] ? fsync_bdev+0xc0/0xc0 [ 38.675655] ? locks_remove_file+0x2cd/0x450 [ 38.680053] ? blkdev_put+0x85/0x520 [ 38.683769] ? blkdev_put+0x520/0x520 [ 38.687555] blkdev_close+0x86/0xb0 [ 38.691174] __fput+0x2ce/0x890 [ 38.694448] task_work_run+0x148/0x1c0 [ 38.698345] exit_to_usermode_loop+0x251/0x2a0 [ 38.702946] do_syscall_64+0x538/0x620 [ 38.706870] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.712068] RIP: 0033:0x7f6ed00ab270 [ 38.715769] Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 [ 38.734750] RSP: 002b:00007fffaa3aae38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 38.742449] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f6ed00ab270 [ 38.749738] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 38.756997] RBP: 00007f6ed0f65710 R08: 000055e48babbcd0 R09: 0000000000000018 [ 38.764255] R10: 000055e48bab9dc8 R11: 0000000000000246 R12: 0000000000000000 [ 38.771513] R13: 000055e48bab56e0 R14: 0000000000000003 R15: 000000000000000e [ 38.779015] Kernel Offset: disabled [ 38.782677] Rebooting in 86400 seconds..