Starting Update UTMP about System Runlevel Changes... [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.16' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory syzkaller login: [ 36.727903] ====================================================== [ 36.727903] WARNING: the mand mount option is being deprecated and [ 36.727903] will be removed in v5.15! [ 36.727903] ====================================================== executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program executing program executing program executing program [ 36.818725] ------------[ cut here ]------------ [ 36.823502] kernel BUG at fs/buffer.c:3106! [ 36.831244] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 36.836609] Modules linked in: [ 36.839800] CPU: 1 PID: 8010 Comm: syz-executor227 Not tainted 4.14.291-syzkaller #0 [ 36.847676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 36.857020] task: ffff8880b2e9c000 task.stack: ffff8880b46f0000 [ 36.863072] RIP: 0010:submit_bh_wbc+0x573/0x6f0 write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory [ 36.867725] RSP: 0018:ffff8880b46f7970 EFLAGS: 00010297 [ 36.873077] RAX: ffff8880b2e9c000 RBX: ffff88808dec31f8 RCX: 0000000000000000 [ 36.880335] RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000000000000 [ 36.887592] RBP: ffff8880b40c0b00 R08: 0000000000000000 R09: 0000000000000000 [ 36.894853] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000003000 [ 36.902117] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b46f7a38 [ 36.909386] FS: 00007fdf2354c700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 36.917603] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.923473] CR2: 00007ffea6bb79b0 CR3: 00000000a53da000 CR4: 00000000003406e0 [ 36.930734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.938009] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.945256] Call Trace: [ 36.947842] read_mmp_block+0x119/0x5e0 [ 36.951789] ? write_mmp_block+0x1fb/0x2d0 [ 36.956002] ext4_multi_mount_protect+0x438/0x9c0 [ 36.960833] ? __dump_mmp_msg+0xa0/0xa0 [ 36.964787] ext4_fill_super+0x8e41/0xb3c0 write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory [ 36.969013] ? ext4_calculate_overhead+0x10b0/0x10b0 [ 36.974100] ? lock_downgrade+0x740/0x740 [ 36.978238] ? snprintf+0xa5/0xd0 [ 36.981668] ? ns_test_super+0x50/0x50 [ 36.985529] ? set_blocksize+0x125/0x380 [ 36.989565] mount_bdev+0x2b3/0x360 [ 36.993179] ? ext4_calculate_overhead+0x10b0/0x10b0 [ 36.998259] mount_fs+0x92/0x2a0 [ 37.001604] vfs_kern_mount.part.0+0x5b/0x470 [ 37.006084] do_mount+0xe65/0x2a30 [ 37.009600] ? do_raw_spin_unlock+0x164/0x220 [ 37.014081] ? copy_mount_string+0x40/0x40 executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory [ 37.018308] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 37.023320] ? copy_mnt_ns+0xa30/0xa30 [ 37.027207] ? copy_mount_options+0x1fa/0x2f0 [ 37.031690] ? copy_mnt_ns+0xa30/0xa30 [ 37.035567] SyS_mount+0xa8/0x120 [ 37.039008] ? copy_mnt_ns+0xa30/0xa30 [ 37.042889] do_syscall_64+0x1d5/0x640 [ 37.046771] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 37.051945] RIP: 0033:0x7fdf235a95ba [ 37.055646] RSP: 002b:00007fdf2354c018 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory [ 37.063349] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fdf235a95ba [ 37.070605] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fdf2354c080 [ 37.078605] RBP: 0000000000000004 R08: 00007fdf2354c0c0 R09: 0000000000000000 [ 37.085862] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 [ 37.093123] R13: 0000000020000368 R14: 00007fdf2354c080 R15: 0000000020000100 [ 37.100392] Code: 16 c2 ff f0 80 63 01 f7 e9 66 fb ff ff 48 8d 43 10 4c 8d 7b 20 48 89 44 24 08 e9 55 fc ff ff e8 04 16 c2 ff 0f 0b e8 fd 15 c2 ff <0f> 0b e8 f6 15 c2 ff 0f 0b e8 ef 15 c2 ff 0f 0b e8 e8 15 c2 ff executing program executing program executing program executing program executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program executing program executing program [ 37.119530] RIP: submit_bh_wbc+0x573/0x6f0 RSP: ffff8880b46f7970 [ 37.135415] ---[ end trace 922bfbe7446b1a5d ]--- [ 37.153897] Kernel panic - not syncing: Fatal exception [ 37.159349] Kernel Offset: disabled [ 37.162959] Rebooting in 86400 seconds..