[ 57.642066][ T26] audit: type=1800 audit(1573144687.599:25): pid=8721 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.668438][ T26] audit: type=1800 audit(1573144687.599:26): pid=8721 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.716072][ T26] audit: type=1800 audit(1573144687.599:27): pid=8721 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. [ 58.365969][ T8789] sshd (8789) 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 '10.128.1.10' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 67.573240][ T8876] overlayfs: conflicting lowerdir path [ 67.582486][ T8876] overlayfs: conflicting lowerdir path [ 67.602914][ T8880] overlayfs: conflicting lowerdir path executing program executing program [ 67.624047][ T8884] overlayfs: conflicting lowerdir path [ 67.632717][ T8884] overlayfs: conflicting lowerdir path [ 67.652589][ T8888] overlayfs: conflicting lowerdir path executing program executing program [ 67.672674][ T8892] overlayfs: conflicting lowerdir path [ 67.681364][ T8892] overlayfs: conflicting lowerdir path [ 67.702367][ T8896] overlayfs: conflicting lowerdir path [ 67.711015][ T8896] overlayfs: conflicting lowerdir path executing program executing program [ 67.730935][ T8900] overlayfs: conflicting lowerdir path [ 67.739615][ T8900] overlayfs: conflicting lowerdir path [ 67.759898][ T8904] overlayfs: conflicting lowerdir path [ 67.768547][ T8904] overlayfs: conflicting lowerdir path [ 67.787767][ T8908] overlayfs: conflicting lowerdir path [ 67.797299][ T8908] overlayfs: upper fs does not support xattr, falling back to index=off and metacopy=off. [ 67.807763][ T8908] overlayfs: conflicting lowerdir path [ 67.818466][ T8874] BUG: Dentry 00000000c225b886{i=685d,n=#26717} still in use (1) [unmount of hugetlbfs hugetlbfs] [ 67.829563][ T8874] ------------[ cut here ]------------ [ 67.835031][ T8874] WARNING: CPU: 1 PID: 8874 at fs/dcache.c:1595 umount_check.cold+0xe9/0x10a [ 67.843764][ T8874] Kernel panic - not syncing: panic_on_warn set ... [ 67.850330][ T8874] CPU: 1 PID: 8874 Comm: syz-executor027 Not tainted 5.4.0-rc6-next-20191107 #0 [ 67.860712][ T8874] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.870743][ T8874] Call Trace: [ 67.874016][ T8874] dump_stack+0x197/0x210 [ 67.878332][ T8874] ? umount_check.cold+0x86/0x10a [ 67.883356][ T8874] panic+0x2e3/0x75c [ 67.887228][ T8874] ? add_taint.cold+0x16/0x16 [ 67.892842][ T8874] ? printk+0xba/0xed [ 67.898833][ T8874] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 67.904270][ T8874] ? __warn.cold+0x14/0x35 [ 67.908663][ T8874] ? __warn+0xd9/0x1d0 [ 67.912715][ T8874] ? umount_check.cold+0xe9/0x10a [ 67.917730][ T8874] __warn.cold+0x2f/0x35 [ 67.921966][ T8874] ? report_bug.cold+0x63/0xb2 [ 67.926717][ T8874] ? umount_check.cold+0xe9/0x10a [ 67.931807][ T8874] report_bug+0x289/0x300 [ 67.936117][ T8874] do_error_trap+0x11b/0x200 [ 67.940701][ T8874] do_invalid_op+0x37/0x50 [ 67.945109][ T8874] ? umount_check.cold+0xe9/0x10a [ 67.950113][ T8874] invalid_op+0x23/0x30 [ 67.954260][ T8874] RIP: 0010:umount_check.cold+0xe9/0x10a [ 67.959871][ T8874] Code: 89 ff e8 70 8f ef ff 48 81 c3 88 06 00 00 45 89 e8 4c 89 e1 53 4d 8b 0f 4c 89 f2 4c 89 e6 48 c7 c7 20 d9 b6 87 e8 b1 f4 9c ff <0f> 0b 58 e9 7d 1b ff ff e8 40 8f ef ff e9 29 ff ff ff 45 31 f6 e9 [ 67.979462][ T8874] RSP: 0018:ffff888095c0fbc8 EFLAGS: 00010282 [ 67.985518][ T8874] RAX: 0000000000000060 RBX: ffff888098736688 RCX: 0000000000000000 [ 67.993480][ T8874] RDX: 0000000000000000 RSI: ffffffff815d0b86 RDI: ffffed1012b81f6b [ 68.001431][ T8874] RBP: ffff888095c0fbf8 R08: 0000000000000060 R09: ffffed1015d26161 [ 68.009382][ T8874] R10: ffffed1015d26160 R11: ffff8880ae930b07 R12: ffff888090c7b300 [ 68.017330][ T8874] R13: 0000000000000001 R14: 000000000000685d R15: ffffffff8910a5e0 [ 68.025290][ T8874] ? vprintk_func+0x86/0x189 [ 68.029877][ T8874] ? umount_check.cold+0xe9/0x10a [ 68.034879][ T8874] d_walk+0x27e/0x930 [ 68.038941][ T8874] ? d_find_alias+0x2c0/0x2c0 [ 68.043599][ T8874] do_one_tree+0x28/0x40 [ 68.047837][ T8874] shrink_dcache_for_umount+0x72/0x170 [ 68.053278][ T8874] generic_shutdown_super+0x6d/0x370 [ 68.058558][ T8874] kill_anon_super+0x3e/0x60 [ 68.066259][ T8874] kill_litter_super+0x50/0x60 [ 68.071015][ T8874] deactivate_locked_super+0x95/0x100 [ 68.076377][ T8874] deactivate_super+0x1b2/0x1d0 [ 68.081225][ T8874] ? mount_bdev+0x3c0/0x3c0 [ 68.085706][ T8874] ? dput+0x38/0xe10 [ 68.089586][ T8874] ? dput+0x1ed/0xe10 [ 68.093548][ T8874] ? mnt_get_writers.isra.0+0xf9/0x150 [ 68.099010][ T8874] cleanup_mnt+0x351/0x4c0 [ 68.103416][ T8874] ? trace_hardirqs_on+0x67/0x240 [ 68.108432][ T8874] ? __kasan_check_read+0x11/0x20 [ 68.113448][ T8874] __cleanup_mnt+0x16/0x20 [ 68.117842][ T8874] task_work_run+0x145/0x1c0 [ 68.122414][ T8874] exit_to_usermode_loop+0x316/0x380 [ 68.127694][ T8874] do_syscall_64+0x65f/0x760 [ 68.132278][ T8874] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.138164][ T8874] RIP: 0033:0x449707 [ 68.142039][ T8874] Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ed dc 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 cd dc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.161633][ T8874] RSP: 002b:00007ffe00511778 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 [ 68.170042][ T8874] RAX: 0000000000000000 RBX: 00000000000108a6 RCX: 0000000000449707 [ 68.178002][ T8874] RDX: 0000000000400df0 RSI: 0000000000000002 RDI: 00007ffe00511820 [ 68.186042][ T8874] RBP: 00000000000022cb R08: 0000000000000000 R09: 0000000000000009 [ 68.193990][ T8874] R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffe005128d0 [ 68.201943][ T8874] R13: 0000000002133880 R14: 0000000000000000 R15: 0000000000000000 [ 68.212222][ T8874] Kernel Offset: disabled [ 68.216808][ T8874] Rebooting in 86400 seconds..