[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.170' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.221430] overlayfs: fs on './file0' does not support file handles, falling back to index=off. [ 30.234708] audit: type=1804 audit(1648632183.446:2): pid=7964 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor238" name="/root/bus/bus/file0" dev="sda1" ino=13864 res=1 [ 30.242938] ------------[ cut here ]------------ [ 30.258899] WARNING: CPU: 0 PID: 7964 at fs/inode.c:285 drop_nlink+0x7d/0xd0 [ 30.266099] Kernel panic - not syncing: panic_on_warn set ... [ 30.266099] [ 30.273465] CPU: 0 PID: 7964 Comm: syz-executor238 Not tainted 4.14.274-syzkaller #0 [ 30.281510] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.290865] Call Trace: [ 30.293457] dump_stack+0x1b2/0x281 [ 30.297073] panic+0x1f9/0x42d [ 30.300255] ? add_taint.cold+0x16/0x16 [ 30.304229] ? drop_nlink+0x7d/0xd0 [ 30.307849] ? drop_nlink+0x7d/0xd0 [ 30.311468] __warn.cold+0x20/0x44 [ 30.315003] ? ist_end_non_atomic+0x10/0x10 [ 30.319317] ? drop_nlink+0x7d/0xd0 [ 30.323025] report_bug+0x208/0x250 [ 30.326649] do_error_trap+0x195/0x2d0 [ 30.330636] ? math_error+0x2d0/0x2d0 [ 30.334520] ? debug_object_free+0x320/0x320 [ 30.338921] ? unlock_rename+0x9e/0xc0 [ 30.342800] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.347677] invalid_op+0x1b/0x40 [ 30.351127] RIP: 0010:drop_nlink+0x7d/0xd0 [ 30.355437] RSP: 0018:ffff88808dac7ce8 EFLAGS: 00010297 [ 30.360790] RAX: ffff8880964c45c0 RBX: ffff8880976310a0 RCX: 0000000000000000 [ 30.368054] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880976310a0 [ 30.375325] RBP: 00000000ffffffff R08: ffff8880964c45c0 R09: dffffc0000000000 [ 30.382586] R10: 0000000000000000 R11: ffff8880964c45c0 R12: ffff8880976310e8 [ 30.389849] R13: ffff88808e4e0580 R14: 0000000000000000 R15: 1ffff11011b58fa9 [ 30.397133] ? drop_nlink+0x7d/0xd0 [ 30.400754] ovl_do_remove+0x5d6/0xb90 [ 30.404666] ? ovl_rename+0xe50/0xe50 [ 30.408466] vfs_unlink+0x230/0x470 [ 30.412208] do_unlinkat+0x30c/0x5c0 [ 30.415917] ? do_rmdir+0x3c0/0x3c0 [ 30.419537] ? mntput+0x5c/0x80 [ 30.422941] ? SyS_chdir+0x10d/0x1a0 [ 30.426693] ? SyS_access+0x20/0x20 [ 30.430328] ? do_syscall_64+0x4c/0x640 [ 30.434288] ? SyS_unlinkat+0x70/0x70 [ 30.438076] do_syscall_64+0x1d5/0x640 [ 30.441966] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.447148] RIP: 0033:0x7f1f6ef6af99 [ 30.450883] RSP: 002b:00007ffd74fb74e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 [ 30.458590] RAX: ffffffffffffffda RBX: 00007ffd74fb74f8 RCX: 00007f1f6ef6af99 [ 30.465857] RDX: 00007f1f6ef6af99 RSI: bf4714f75c52275c RDI: 0000000020000540 [ 30.473122] RBP: 00007ffd74fb74f0 R08: 00007f1f6ef294f0 R09: 00007f1f6ef294f0 [ 30.480386] R10: 00007f1f6ef294f0 R11: 0000000000000246 R12: 0000000000000000 [ 30.487775] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 30.495609] Kernel Offset: disabled [ 30.499322] Rebooting in 86400 seconds..