INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.112588] ------------[ cut here ]------------ [ 35.117596] WARNING: CPU: 1 PID: 3812 at fs/attr.c:211 notify_change2+0xa78/0xdf0 [ 35.125302] Kernel panic - not syncing: panic_on_warn set ... [ 35.125302] [ 35.132640] CPU: 1 PID: 3812 Comm: syzkaller431776 Not tainted 4.9.94-g8683408 #1 [ 35.140247] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.149583] ffff8801d96af8c8 ffffffff81eb0aa9 ffffffff83a484a0 00000000ffffffff [ 35.157562] 0000000000000000 0000000000000001 00000000000000d3 ffff8801d96af988 [ 35.165544] ffffffff8141f845 0000000041b58ab3 ffffffff841b7b48 ffffffff8141f686 [ 35.173522] Call Trace: [ 35.176083] [] dump_stack+0xc1/0x128 [ 35.181418] [] panic+0x1bf/0x3bc [ 35.186413] [] ? add_taint.cold.6+0x16/0x16 [ 35.192359] [] ? shmem_xattr_handler_get+0x3e/0x50 [ 35.198907] [] ? shmem_xattr_handler_set+0x50/0x50 [ 35.205455] [] ? __warn.cold.9+0xa6/0x17f [ 35.211235] [] ? notify_change2+0xa78/0xdf0 [ 35.217189] [] __warn.cold.9+0xc1/0x17f [ 35.222800] [] warn_slowpath_null+0x2c/0x40 [ 35.228756] [] notify_change2+0xa78/0xdf0 [ 35.234534] [] ? cap_inode_need_killpriv+0x40/0x60 [ 35.241108] [] ? security_inode_need_killpriv+0x7f/0xb0 [ 35.248096] [] file_remove_privs+0x279/0x480 [ 35.254128] [] ? clear_nlink+0xb0/0xb0 [ 35.259646] [] __generic_file_write_iter+0x161/0x540 [ 35.267024] [] ? __lock_acquire+0x654/0x4070 [ 35.273056] [] blkdev_write_iter+0x1b7/0x370 [ 35.279097] [] ? __lock_acquire+0x654/0x4070 [ 35.285134] [] ? bd_acquire+0x250/0x250 [ 35.290729] [] ? iov_iter_init+0xaf/0x1d0 [ 35.296497] [] __vfs_write+0x3e0/0x580 [ 35.302002] [] ? default_llseek+0x280/0x280 [ 35.307946] [] ? avc_policy_seqno+0x9/0x20 [ 35.313803] [] ? selinux_file_permission+0x82/0x470 [ 35.320442] [] ? rw_verify_area+0xe5/0x2b0 [ 35.326319] [] vfs_write+0x187/0x530 [ 35.331657] [] SyS_write+0xd9/0x1c0 [ 35.336903] [] ? SyS_read+0x1c0/0x1c0 [ 35.342326] [] ? do_syscall_64+0x48/0x490 [ 35.348102] [] ? SyS_read+0x1c0/0x1c0 [ 35.353522] [] do_syscall_64+0x1a6/0x490 [ 35.359205] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.366607] Dumping ftrace buffer: [ 35.370156] (ftrace buffer empty) [ 35.373839] Kernel Offset: disabled [ 35.377448] Rebooting in 86400 seconds..