[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.217661] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.632739] random: sshd: uninitialized urandom read (32 bytes read) [ 14.190645] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.924652] random: sshd: uninitialized urandom read (32 bytes read) [ 15.057472] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 20.530533] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 21.134412] ================================================================== [ 21.141812] BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 [ 21.148186] Read of size 8 at addr ffff8801b6387820 by task syz-executor797/3793 [ 21.155684] [ 21.157287] CPU: 1 PID: 3793 Comm: syz-executor797 Not tainted 4.9.97-g19bd3e3 #12 [ 21.164963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.174287] ffff8801b5d07888 ffffffff81eb0b69 ffffea0006d8e1c0 ffff8801b6387820 executing program executing program [ 21.182261] 0000000000000000 ffff8801b6387828 ffff8801b5d079c0 ffff8801b5d078c0 [ 21.190230] ffffffff8156540b ffff8801b6387820 0000000000000008 0000000000000000 [ 21.198211] Call Trace: [ 21.200772] [] dump_stack+0xc1/0x128 [ 21.206103] [] print_address_description+0x6c/0x234 [ 21.212743] [] kasan_report.cold.6+0x242/0x2fe [ 21.218946] [] ? __unwind_start+0x37c/0x3c0 [ 21.224890] [] __asan_report_load8_noabort+0x14/0x20 executing program [ 21.231622] [] __unwind_start+0x37c/0x3c0 [ 21.237390] [] ? ptrace_may_access+0x24/0x50 [ 21.243416] [] __save_stack_trace+0x59/0xf0 [ 21.249355] [] save_stack_trace_tsk+0x48/0x70 [ 21.255470] [] proc_pid_stack+0x148/0x220 [ 21.261242] [] ? lock_trace+0xc0/0xc0 [ 21.266664] [] proc_single_show+0xfd/0x170 [ 21.272520] [] seq_read+0x4b6/0x12e0 [ 21.277854] [] ? seq_dentry+0x290/0x290 executing program executing program [ 21.283452] [] ? fsnotify+0x114/0x1100 [ 21.288975] [] ? __lock_is_held+0xa2/0xf0 [ 21.294743] [] __vfs_read+0x115/0x570 [ 21.300186] [] ? seq_dentry+0x290/0x290 [ 21.305784] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 21.312250] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 21.320714] [] ? fsnotify+0x1100/0x1100 [ 21.326309] [] ? avc_policy_seqno+0x9/0x20 executing program executing program [ 21.332163] [] ? selinux_file_permission+0x82/0x470 [ 21.338798] [] ? security_file_permission+0x8f/0x1f0 [ 21.345532] [] ? rw_verify_area+0xe5/0x2b0 [ 21.351389] [] vfs_read+0x120/0x380 [ 21.356634] [] SyS_read+0xd9/0x1c0 [ 21.361790] [] ? vfs_copy_file_range+0x850/0x850 [ 21.368163] [] ? do_syscall_64+0x48/0x490 [ 21.373929] [] ? vfs_copy_file_range+0x850/0x850 executing program [ 21.380309] [] do_syscall_64+0x1a6/0x490 [ 21.385990] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.392883] [ 21.394479] The buggy address belongs to the page: [ 21.399377] page:ffffea0006d8e1c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 21.407602] flags: 0x8000000000000000() [ 21.411546] page dumped because: kasan: bad access detected [ 21.417220] [ 21.418817] Memory state around the buggy address: [ 21.423713] ffff8801b6387700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 executing program executing program [ 21.431039] ffff8801b6387780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.438365] >ffff8801b6387800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.445693] ^ [ 21.450332] ffff8801b6387880: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 [ 21.457667] ffff8801b6387900: f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 [ 21.464992] ================================================================== [ 21.472319] Disabling lock debugging due to kernel taint [ 21.478161] Kernel panic - not syncing: panic_on_warn set ... [ 21.478161] [ 21.485523] CPU: 0 PID: 3793 Comm: syz-executor797 Tainted: G B 4.9.97-g19bd3e3 #12 [ 21.494411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.503734] ffff8801b5d077e8 ffffffff81eb0b69 ffffffff843c4d05 00000000ffffffff [ 21.511705] 0000000000000000 0000000000000000 ffff8801b5d079c0 ffff8801b5d078a8 [ 21.519675] ffffffff8141f975 0000000041b58ab3 ffffffff843b8408 ffffffff8141f7b6 [ 21.527640] Call Trace: [ 21.530197] [] dump_stack+0xc1/0x128 [ 21.535532] [] panic+0x1bf/0x3bc [ 21.540516] [] ? add_taint.cold.6+0x16/0x16 [ 21.546459] [] ? ___preempt_schedule+0x16/0x18 [ 21.552659] [] kasan_end_report+0x47/0x4f [ 21.558423] [] kasan_report.cold.6+0x76/0x2fe [ 21.564535] [] ? __unwind_start+0x37c/0x3c0 [ 21.570479] [] __asan_report_load8_noabort+0x14/0x20 [ 21.577199] [] __unwind_start+0x37c/0x3c0 [ 21.582965] [] ? ptrace_may_access+0x24/0x50 [ 21.588993] [] __save_stack_trace+0x59/0xf0 [ 21.594936] [] save_stack_trace_tsk+0x48/0x70 [ 21.601052] [] proc_pid_stack+0x148/0x220 [ 21.606818] [] ? lock_trace+0xc0/0xc0 [ 21.612239] [] proc_single_show+0xfd/0x170 [ 21.618091] [] seq_read+0x4b6/0x12e0 [ 21.623422] [] ? seq_dentry+0x290/0x290 [ 21.629015] [] ? fsnotify+0x114/0x1100 [ 21.634532] [] ? __lock_is_held+0xa2/0xf0 [ 21.640304] [] __vfs_read+0x115/0x570 [ 21.645724] [] ? seq_dentry+0x290/0x290 [ 21.651317] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 21.657778] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 21.666233] [] ? fsnotify+0x1100/0x1100 [ 21.671827] [] ? avc_policy_seqno+0x9/0x20 [ 21.677679] [] ? selinux_file_permission+0x82/0x470 [ 21.684312] [] ? security_file_permission+0x8f/0x1f0 [ 21.691033] [] ? rw_verify_area+0xe5/0x2b0 [ 21.696905] [] vfs_read+0x120/0x380 [ 21.702155] [] SyS_read+0xd9/0x1c0 [ 21.707313] [] ? vfs_copy_file_range+0x850/0x850 [ 21.713686] [] ? do_syscall_64+0x48/0x490 [ 21.719451] [] ? vfs_copy_file_range+0x850/0x850 [ 21.725823] [] do_syscall_64+0x1a6/0x490 [ 21.731505] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.738866] Dumping ftrace buffer: [ 21.742376] (ftrace buffer empty) [ 21.746058] Kernel Offset: disabled [ 21.749659] Rebooting in 86400 seconds..