[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.124284] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.071038] random: sshd: uninitialized urandom read (32 bytes read) [ 21.480279] random: sshd: uninitialized urandom read (32 bytes read) [ 22.270458] random: sshd: uninitialized urandom read (32 bytes read) [ 22.395573] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 27.833402] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.916109] md: md0 stopped. [ 27.920687] md: md0 stopped. [ 27.924593] ------------[ cut here ]------------ [ 27.924611] WARNING: CPU: 1 PID: 3807 at drivers/md/md.c:6847 md_ioctl+0x311d/0x5280 [ 27.924615] Kernel panic - not syncing: panic_on_warn set ... [ 27.924615] [ 27.924624] CPU: 1 PID: 3807 Comm: syz-executor174 Not tainted 4.9.96-g71fce1e #10 [ 27.924628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.924642] ffff8801d971f7b0 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 27.924650] 0000000000000000 0000000000000001 0000000000001abf ffff8801d971f870 [ 27.924659] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 27.924661] Call Trace: [ 27.924672] [] dump_stack+0xc1/0x128 [ 27.924681] [] panic+0x1bf/0x3bc [ 27.924689] [] ? add_taint.cold.6+0x16/0x16 [ 27.924697] [] ? __warn.cold.9+0xa6/0x17f [ 27.924704] [] ? md_ioctl+0x311d/0x5280 [ 27.924711] [] __warn.cold.9+0xc1/0x17f [ 27.924721] [] warn_slowpath_null+0x2c/0x40 [ 27.924728] [] md_ioctl+0x311d/0x5280 [ 27.924739] [] ? refill_pi_state_cache.part.8+0x200/0x200 [ 27.924747] [] ? add_new_disk+0x1500/0x1500 [ 27.924757] [] ? debug_check_no_locks_freed+0x210/0x210 [ 27.924765] [] ? futex_wait+0x305/0x5d0 [ 27.924774] [] ? futex_wait_setup+0x330/0x330 [ 27.924781] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 27.924791] [] ? check_preemption_disabled+0x3b/0x170 [ 27.924800] [] ? avc_has_extended_perms+0x5ad/0xf00 [ 27.924808] [] ? avc_has_extended_perms+0x6ec/0xf00 [ 27.924814] [] ? avc_has_extended_perms+0xe1/0xf00 [ 27.924822] [] ? putname+0xdb/0x110 [ 27.924828] [] ? save_stack+0xa9/0xd0 [ 27.924833] [] ? add_new_disk+0x1500/0x1500 [ 27.924841] [] blkdev_ioctl+0x7b6/0x1a70 [ 27.924847] [] ? blkpg_ioctl+0x920/0x920 [ 27.924853] [] ? __lock_acquire+0x654/0x4070 [ 27.924860] [] ? exit_robust_list+0x220/0x220 [ 27.924869] [] block_ioctl+0xde/0x120 [ 27.924876] [] ? blkdev_fallocate+0x440/0x440 [ 27.924882] [] do_vfs_ioctl+0x1ac/0x11a0 [ 27.924888] [] ? ioctl_preallocate+0x220/0x220 [ 27.924896] [] ? selinux_capable+0x40/0x40 [ 27.924904] [] ? __fget+0x20a/0x3b0 [ 27.924911] [] ? __fget+0x231/0x3b0 [ 27.924918] [] ? __fget+0x47/0x3b0 [ 27.924925] [] ? security_file_ioctl+0x8f/0xc0 [ 27.924930] [] SyS_ioctl+0x8f/0xc0 [ 27.924936] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 27.924944] [] do_syscall_64+0x1a6/0x490 [ 27.924952] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.925753] Dumping ftrace buffer: [ 27.925794] (ftrace buffer empty) [ 27.925796] Kernel Offset: disabled [ 28.223232] Rebooting in 86400 seconds..