[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.089288] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.371842] random: sshd: uninitialized urandom read (32 bytes read) [ 22.781931] random: sshd: uninitialized urandom read (32 bytes read) [ 23.374722] random: sshd: uninitialized urandom read (32 bytes read) [ 34.997641] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 40.480608] 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 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 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 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 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 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 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 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 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 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 40.696037] ================================================================== [ 40.703411] BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 [ 40.709784] Read of size 8 at addr ffff8801b6457820 by task syz-executor386/3809 [ 40.717283] [ 40.718891] CPU: 1 PID: 3809 Comm: syz-executor386 Not tainted 4.9.98-g0e25e2c #15 [ 40.726563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.735899] ffff8801d95a7770 ffffffff81eb0fc9 ffffea0006d915c0 ffff8801b6457820 executing program executing program [ 40.743873] 0000000000000000 ffff8801b6457828 ffff8801d95a78a8 ffff8801d95a77a8 [ 40.751846] ffffffff8156540b ffff8801b6457820 0000000000000008 0000000000000000 [ 40.759817] Call Trace: [ 40.762375] [] dump_stack+0xc1/0x128 [ 40.767711] [] print_address_description+0x6c/0x234 [ 40.774346] [] kasan_report.cold.6+0x242/0x2fe [ 40.780549] [] ? __unwind_start+0x37c/0x3c0 [ 40.786505] [] __asan_report_load8_noabort+0x14/0x20 executing program [ 40.793227] [] __unwind_start+0x37c/0x3c0 [ 40.798997] [] ? ptrace_may_access+0x24/0x50 [ 40.805025] [] __save_stack_trace+0x59/0xf0 [ 40.810968] [] save_stack_trace_tsk+0x48/0x70 [ 40.817087] [] proc_pid_stack+0x148/0x220 [ 40.822854] [] ? lock_trace+0xc0/0xc0 [ 40.828274] [] proc_single_show+0xfd/0x170 [ 40.834128] [] seq_read+0x4b6/0x12e0 [ 40.839460] [] ? seq_dentry+0x290/0x290 executing program executing program [ 40.845054] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 40.853514] [] ? fsnotify+0x1100/0x1100 [ 40.859111] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 40.866007] [] do_readv_writev+0x565/0x7a0 [ 40.871862] [] ? vfs_write+0x530/0x530 [ 40.877372] [] ? mark_held_locks+0xc7/0x130 [ 40.883312] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.890134] [] ? mutex_lock_nested+0x596/0x870 executing program executing program [ 40.896336] [] ? __fdget_pos+0xac/0xd0 [ 40.901845] [] ? __fget+0x20a/0x3b0 [ 40.907089] [] ? mutex_trylock+0x3e0/0x3e0 [ 40.912942] [] ? __fget+0x231/0x3b0 [ 40.918193] [] ? __fget+0x47/0x3b0 [ 40.923354] [] vfs_readv+0x84/0xc0 [ 40.928516] [] do_readv+0xe6/0x260 [ 40.933684] [] ? vfs_readv+0xc0/0xc0 [ 40.939014] [] SyS_readv+0x27/0x30 executing program [ 40.944173] [] ? rw_copy_check_uvector+0x330/0x330 [ 40.950724] [] do_syscall_64+0x1a6/0x490 [ 40.956404] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.963296] [ 40.964891] The buggy address belongs to the page: [ 40.969787] page:ffffea0006d915c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 40.978013] flags: 0x8000000000000000() [ 40.981954] page dumped because: kasan: bad access detected [ 40.987631] [ 40.989228] Memory state around the buggy address: executing program executing program [ 40.994126] ffff8801b6457700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.001452] ffff8801b6457780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.008782] >ffff8801b6457800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.016109] ^ [ 41.020749] ffff8801b6457880: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 [ 41.028079] ffff8801b6457900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.035403] ================================================================== executing program executing program [ 41.042727] Disabling lock debugging due to kernel taint [ 41.048307] Kernel panic - not syncing: panic_on_warn set ... [ 41.048307] [ 41.055650] CPU: 1 PID: 3809 Comm: syz-executor386 Tainted: G B 4.9.98-g0e25e2c #15 [ 41.064538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.073863] ffff8801d95a76d0 ffffffff81eb0fc9 ffffffff843c4fe5 00000000ffffffff [ 41.081835] 0000000000000000 0000000000000001 ffff8801d95a78a8 ffff8801d95a7790 [ 41.089810] ffffffff8141f975 0000000041b58ab3 ffffffff843b86e8 ffffffff8141f7b6 executing program [ 41.097781] Call Trace: [ 41.100340] [] dump_stack+0xc1/0x128 [ 41.105674] [] panic+0x1bf/0x3bc [ 41.110664] [] ? add_taint.cold.6+0x16/0x16 [ 41.116604] [] ? ___preempt_schedule+0x16/0x18 [ 41.122804] [] kasan_end_report+0x47/0x4f [ 41.128571] [] kasan_report.cold.6+0x76/0x2fe [ 41.134688] [] ? __unwind_start+0x37c/0x3c0 [ 41.140634] [] __asan_report_load8_noabort+0x14/0x20 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 executing program [ 41.147356] [] __unwind_start+0x37c/0x3c0 [ 41.153125] [] ? ptrace_may_access+0x24/0x50 [ 41.159155] [] __save_stack_trace+0x59/0xf0 [ 41.165097] [] save_stack_trace_tsk+0x48/0x70 [ 41.171212] [] proc_pid_stack+0x148/0x220 [ 41.176978] [] ? lock_trace+0xc0/0xc0 [ 41.182396] [] proc_single_show+0xfd/0x170 [ 41.188252] [] seq_read+0x4b6/0x12e0 [ 41.193585] [] ? seq_dentry+0x290/0x290 [ 41.199182] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 41.207644] [] ? fsnotify+0x1100/0x1100 [ 41.213241] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 41.220138] [] do_readv_writev+0x565/0x7a0 [ 41.225993] [] ? vfs_write+0x530/0x530 [ 41.231500] [] ? mark_held_locks+0xc7/0x130 [ 41.237440] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 41.244249] [] ? mutex_lock_nested+0x596/0x870 [ 41.250448] [] ? __fdget_pos+0xac/0xd0 [ 41.255955] [] ? __fget+0x20a/0x3b0 [ 41.261200] [] ? mutex_trylock+0x3e0/0x3e0 [ 41.267055] [] ? __fget+0x231/0x3b0 [ 41.272299] [] ? __fget+0x47/0x3b0 [ 41.277459] [] vfs_readv+0x84/0xc0 [ 41.282617] [] do_readv+0xe6/0x260 [ 41.287776] [] ? vfs_readv+0xc0/0xc0 [ 41.293117] [] SyS_readv+0x27/0x30 [ 41.298277] [] ? rw_copy_check_uvector+0x330/0x330 [ 41.304827] [] do_syscall_64+0x1a6/0x490 [ 41.310506] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 41.317764] Dumping ftrace buffer: [ 41.321274] (ftrace buffer empty) [ 41.324955] Kernel Offset: disabled [ 41.328554] Rebooting in 86400 seconds..