[ 62.001461][ T26] audit: type=1800 audit(1576669792.527:25): pid=9027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.029766][ T26] audit: type=1800 audit(1576669792.527:26): pid=9027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.084654][ T26] audit: type=1800 audit(1576669792.527:27): pid=9027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 62.644184][ T9092] sshd (9092) used greatest stack depth: 22888 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 100.422285][ T9180] ------------[ cut here ]------------ [ 100.427853][ T9180] kernel BUG at fs/buffer.c:3094! [ 100.433168][ T9180] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 100.439284][ T9180] CPU: 0 PID: 9180 Comm: syz-executor393 Not tainted 5.5.0-rc2-syzkaller #0 [ 100.447970][ T9180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 100.458059][ T9180] RIP: 0010:submit_bh_wbc+0x71c/0x900 [ 100.463460][ T9180] Code: 14 e5 ff f0 80 63 01 f7 e9 ab fa ff ff e8 bc a5 a7 ff 41 81 cd 00 10 00 00 e9 4d fe ff ff e8 ab a5 a7 ff 0f 0b e8 a4 a5 a7 ff <0f> 0b e8 9d a5 a7 ff 0f 0b e8 96 a5 a7 ff 0f 0b e8 8f a5 a7 ff 0f [ 100.483052][ T9180] RSP: 0018:ffffc90001d77bf8 EFLAGS: 00010293 [ 100.489109][ T9180] RAX: ffff888094538640 RBX: ffff88809218a5e8 RCX: ffffffff81cd7f8d [ 100.497062][ T9180] RDX: 0000000000000000 RSI: ffffffff81cd85fc RDI: 0000000000000001 [ 100.505029][ T9180] RBP: ffffc90001d77c40 R08: ffff888094538640 R09: ffffed10124314be [ 100.512995][ T9180] R10: ffffed10124314bd R11: ffff88809218a5ef R12: 0000000000000000 [ 100.521065][ T9180] R13: 0000000000000800 R14: 0000000000000001 R15: 0000000000000000 [ 100.529018][ T9180] FS: 0000000001561940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 100.537923][ T9180] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.544484][ T9180] CR2: 00000000006d1090 CR3: 00000000a0539000 CR4: 00000000001406f0 [ 100.552794][ T9180] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.560745][ T9180] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.568711][ T9180] Call Trace: [ 100.571987][ T9180] __sync_dirty_buffer+0x12b/0x350 [ 100.577077][ T9180] sync_dirty_buffer+0x1b/0x20 [ 100.581858][ T9180] fat_set_state+0x242/0x330 [ 100.586462][ T9180] ? __sync_blockdev+0x88/0xe0 [ 100.591378][ T9180] fat_put_super+0x46/0xd0 [ 100.595771][ T9180] ? fat_statfs+0x4c0/0x4c0 [ 100.600251][ T9180] generic_shutdown_super+0x14c/0x370 [ 100.605638][ T9180] kill_block_super+0xa0/0x100 [ 100.610424][ T9180] deactivate_locked_super+0x95/0x100 [ 100.615772][ T9180] deactivate_super+0x1b2/0x1d0 [ 100.620601][ T9180] ? mount_bdev+0x3c0/0x3c0 [ 100.625327][ T9180] ? dput+0x38/0xe10 [ 100.629212][ T9180] ? dput+0x1ed/0xe10 [ 100.633173][ T9180] ? mnt_get_writers.isra.0+0xf9/0x150 [ 100.638615][ T9180] cleanup_mnt+0x351/0x4c0 [ 100.643028][ T9180] ? trace_hardirqs_on+0x67/0x240 [ 100.648050][ T9180] __cleanup_mnt+0x16/0x20 [ 100.652450][ T9180] task_work_run+0x145/0x1c0 [ 100.657037][ T9180] exit_to_usermode_loop+0x316/0x380 [ 100.662320][ T9180] do_syscall_64+0x676/0x790 [ 100.666892][ T9180] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 100.672762][ T9180] RIP: 0033:0x448c07 [ 100.676653][ T9180] Code: 00 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 5d a2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 3d a2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 100.696336][ T9180] RSP: 002b:00007ffee36fc1a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 [ 100.704773][ T9180] RAX: 0000000000000000 RBX: 0000000000018755 RCX: 0000000000448c07 [ 100.712740][ T9180] RDX: 0000000000400c80 RSI: 0000000000000002 RDI: 00007ffee36fc250 [ 100.720692][ T9180] RBP: 00000000000023e2 R08: 0000000000000000 R09: 0000000000000009 [ 100.728691][ T9180] R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffee36fd2b0 [ 100.736642][ T9180] R13: 0000000001562940 R14: 0000000000000000 R15: 0000000000000000 [ 100.744636][ T9180] Modules linked in: [ 100.748805][ T9180] ---[ end trace cba1ad7e39cd7b0f ]--- [ 100.755575][ T9180] RIP: 0010:submit_bh_wbc+0x71c/0x900 [ 100.780778][ T9180] Code: 14 e5 ff f0 80 63 01 f7 e9 ab fa ff ff e8 bc a5 a7 ff 41 81 cd 00 10 00 00 e9 4d fe ff ff e8 ab a5 a7 ff 0f 0b e8 a4 a5 a7 ff <0f> 0b e8 9d a5 a7 ff 0f 0b e8 96 a5 a7 ff 0f 0b e8 8f a5 a7 ff 0f [ 100.800500][ T9180] RSP: 0018:ffffc90001d77bf8 EFLAGS: 00010293 [ 100.806585][ T9180] RAX: ffff888094538640 RBX: ffff88809218a5e8 RCX: ffffffff81cd7f8d [ 100.809610][ T9184] kobject: 'loop4' (00000000acf28b99): kobject_uevent_env [ 100.815036][ T9180] RDX: 0000000000000000 RSI: ffffffff81cd85fc RDI: 0000000000000001 [ 100.822394][ T9184] kobject: 'loop4' (00000000acf28b99): fill_kobj_path: path = '/devices/virtual/block/loop4' [ 100.829974][ T9180] RBP: ffffc90001d77c40 R08: ffff888094538640 R09: ffffed10124314be [ 100.829983][ T9180] R10: ffffed10124314bd R11: ffff88809218a5ef R12: 0000000000000000 [ 100.829990][ T9180] R13: 0000000000000800 R14: 0000000000000001 R15: 0000000000000000 [ 100.830002][ T9180] FS: 0000000001561940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 100.830011][ T9180] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.830019][ T9180] CR2: 00007f0aadca9000 CR3: 00000000a0539000 CR4: 00000000001406f0 [ 100.830033][ T9180] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.897899][ T9180] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.905934][ T9180] Kernel panic - not syncing: Fatal exception [ 100.913212][ T9180] Kernel Offset: disabled [ 100.917573][ T9180] Rebooting in 86400 seconds..