Warning: Permanently added '10.128.0.188' (ECDSA) to the list of known hosts.
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syzkaller login: [   32.095498] DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock))
[   32.095568] ------------[ cut here ]------------
[   32.105655] WARNING: CPU: 0 PID: 8053 at kernel/locking/mutex-debug.c:103 mutex_destroy.cold+0x13/0x1a
[   32.115120] Kernel panic - not syncing: panic_on_warn set ...
[   32.115120] 
[   32.122569] CPU: 0 PID: 8053 Comm: syz-executor180 Not tainted 4.14.235-syzkaller #0
[   32.130529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.139875] Call Trace:
[   32.142463]  dump_stack+0x1b2/0x281
[   32.146089]  panic+0x1f9/0x42d
[   32.149279]  ? add_taint.cold+0x16/0x16
[   32.153249]  ? mutex_destroy.cold+0x13/0x1a
[   32.157568]  ? mutex_destroy.cold+0x13/0x1a
[   32.161887]  __warn.cold+0x20/0x44
[   32.165453]  ? ist_end_non_atomic+0x10/0x10
[   32.169795]  ? mutex_destroy.cold+0x13/0x1a
[   32.174112]  report_bug+0x208/0x250
[   32.177741]  do_error_trap+0x195/0x2d0
[   32.181630]  ? math_error+0x2d0/0x2d0
[   32.185429]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.190269]  invalid_op+0x1b/0x40
[   32.193727] RIP: 0010:mutex_destroy.cold+0x13/0x1a
[   32.198655] RSP: 0018:ffff88808cd47da8 EFLAGS: 00010286
[   32.204013] RAX: 000000000000002a RBX: ffff8880b2c4ea80 RCX: 0000000000000000
[   32.211277] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffed10119a8fab
[   32.218543] RBP: ffff8880b2c4e900 R08: 000000000000002a R09: 0000000000000000
[   32.225833] R10: 0000000000000000 R11: ffff8880b308e4c0 R12: 0000000000000000
[   32.233100] R13: ffff8880b2c4ea80 R14: ffff8880b34a6e88 R15: ffff88809dea4cd0
[   32.240386]  ? mutex_destroy.cold+0x13/0x1a
[   32.244712]  dma_buf_release+0x4be/0x5c0
[   32.248771]  ? ima_file_free+0x4f/0x330
[   32.252752]  ? dma_buf_detach+0x240/0x240
[   32.256907]  __fput+0x25f/0x7a0
[   32.260184]  task_work_run+0x11f/0x190
[   32.264070]  exit_to_usermode_loop+0x1ad/0x200
[   32.268663]  ? SyS_ioctl+0x5c/0xb0
[   32.272194]  do_syscall_64+0x4a3/0x640
[   32.276076]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   32.281266] RIP: 0033:0x449f99
[   32.284448] RSP: 002b:00007fe507397308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   32.292155] RAX: 0000000000000000 RBX: 00000000004ca458 RCX: 0000000000449f99
[   32.299424] RDX: 0000000020000000 RSI: 00000000c00464b4 RDI: 0000000000000006
[   32.306690] RBP: 00000000004ca450 R08: 0000000000000000 R09: 0000000000000000
[   32.314075] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca45c
[   32.321346] R13: 000000000049a074 R14: 6972642f7665642f R15: 0000000000022000
[   32.329189] Kernel Offset: disabled
[   32.332903] Rebooting in 86400 seconds..