[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.591762] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.231637] random: sshd: uninitialized urandom read (32 bytes read) [ 18.704014] random: sshd: uninitialized urandom read (32 bytes read) [ 19.429436] random: sshd: uninitialized urandom read (32 bytes read) [ 19.567569] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 25.169326] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.779268] ================================================================== [ 30.786667] BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 [ 30.793046] Read of size 8 at addr ffff8801cdd77820 by task syz-executor361/7570 [ 30.800564] [ 30.802177] CPU: 1 PID: 7570 Comm: syz-executor361 Not tainted 4.9.97-g19bd3e3 #12 [ 30.809859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.819200] ffff8801cefdf888 ffffffff81eb0b69 ffffea0007375dc0 ffff8801cdd77820 [ 30.827203] 0000000000000000 ffff8801cdd77828 ffff8801cefdf9c0 ffff8801cefdf8c0 [ 30.835198] ffffffff8156540b ffff8801cdd77820 0000000000000008 0000000000000000 [ 30.843284] Call Trace: [ 30.845846] [] dump_stack+0xc1/0x128 [ 30.851186] [] print_address_description+0x6c/0x234 [ 30.857824] [] kasan_report.cold.6+0x242/0x2fe [ 30.864121] [] ? __unwind_start+0x37c/0x3c0 [ 30.870068] [] __asan_report_load8_noabort+0x14/0x20 [ 30.876793] [] __unwind_start+0x37c/0x3c0 [ 30.882573] [] ? ptrace_may_access+0x24/0x50 [ 30.888610] [] __save_stack_trace+0x59/0xf0 [ 30.894573] [] save_stack_trace_tsk+0x48/0x70 [ 30.900811] [] proc_pid_stack+0x148/0x220 [ 30.906582] [] ? lock_trace+0xc0/0xc0 [ 30.912007] [] proc_single_show+0xfd/0x170 [ 30.917876] [] seq_read+0x4b6/0x12e0 [ 30.923214] [] ? seq_dentry+0x290/0x290 [ 30.928824] [] ? fsnotify+0x114/0x1100 [ 30.934345] [] ? __lock_is_held+0xa2/0xf0 [ 30.940118] [] __vfs_read+0x115/0x570 [ 30.945540] [] ? seq_dentry+0x290/0x290 [ 30.951137] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 30.957606] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 30.966080] [] ? fsnotify+0x1100/0x1100 [ 30.971683] [] ? avc_policy_seqno+0x9/0x20 [ 30.977549] [] ? selinux_file_permission+0x82/0x470 [ 30.984187] [] ? security_file_permission+0x8f/0x1f0 [ 30.991000] [] ? rw_verify_area+0xe5/0x2b0 [ 30.996865] [] vfs_read+0x120/0x380 [ 31.002122] [] SyS_read+0xd9/0x1c0 [ 31.007294] [] ? vfs_copy_file_range+0x850/0x850 [ 31.013688] [] ? do_syscall_64+0x48/0x490 [ 31.019461] [] ? vfs_copy_file_range+0x850/0x850 [ 31.025839] [] do_syscall_64+0x1a6/0x490 [ 31.031962] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.038871] [ 31.040471] The buggy address belongs to the page: [ 31.045375] page:ffffea0007375dc0 count:0 mapcount:0 mapping: (null) index:0x0 [ 31.053605] flags: 0x8000000000000000() [ 31.057553] page dumped because: kasan: bad access detected [ 31.063243] [ 31.064842] Memory state around the buggy address: [ 31.069753] ffff8801cdd77700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.077101] ffff8801cdd77780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.084615] >ffff8801cdd77800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.091951] ^ [ 31.096594] ffff8801cdd77880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.103930] ffff8801cdd77900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.111258] ================================================================== [ 31.118585] Disabling lock debugging due to kernel taint [ 31.124190] Kernel panic - not syncing: panic_on_warn set ... [ 31.124190] [ 31.131544] CPU: 1 PID: 7570 Comm: syz-executor361 Tainted: G B 4.9.97-g19bd3e3 #12 [ 31.140440] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.149771] ffff8801cefdf7e8 ffffffff81eb0b69 ffffffff843c4d05 00000000ffffffff [ 31.157764] 0000000000000000 0000000000000001 ffff8801cefdf9c0 ffff8801cefdf8a8 [ 31.165779] ffffffff8141f975 0000000041b58ab3 ffffffff843b8408 ffffffff8141f7b6 [ 31.173771] Call Trace: [ 31.176333] [] dump_stack+0xc1/0x128 [ 31.181677] [] panic+0x1bf/0x3bc [ 31.186669] [] ? add_taint.cold.6+0x16/0x16 [ 31.192617] [] ? ___preempt_schedule+0x16/0x18 [ 31.198836] [] kasan_end_report+0x47/0x4f [ 31.204606] [] kasan_report.cold.6+0x76/0x2fe [ 31.210744] [] ? __unwind_start+0x37c/0x3c0 [ 31.216698] [] __asan_report_load8_noabort+0x14/0x20 [ 31.223424] [] __unwind_start+0x37c/0x3c0 [ 31.229208] [] ? ptrace_may_access+0x24/0x50 [ 31.235239] [] __save_stack_trace+0x59/0xf0 [ 31.241183] [] save_stack_trace_tsk+0x48/0x70 [ 31.247312] [] proc_pid_stack+0x148/0x220 [ 31.253088] [] ? lock_trace+0xc0/0xc0 [ 31.258525] [] proc_single_show+0xfd/0x170 [ 31.264498] [] seq_read+0x4b6/0x12e0 [ 31.269843] [] ? seq_dentry+0x290/0x290 [ 31.275441] [] ? fsnotify+0x114/0x1100 [ 31.281042] [] ? __lock_is_held+0xa2/0xf0 [ 31.286815] [] __vfs_read+0x115/0x570 [ 31.292241] [] ? seq_dentry+0x290/0x290 [ 31.297839] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 31.304307] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 31.312770] [] ? fsnotify+0x1100/0x1100 [ 31.318376] [] ? avc_policy_seqno+0x9/0x20 [ 31.324235] [] ? selinux_file_permission+0x82/0x470 [ 31.330886] [] ? security_file_permission+0x8f/0x1f0 [ 31.337620] [] ? rw_verify_area+0xe5/0x2b0 [ 31.343475] [] vfs_read+0x120/0x380 [ 31.348727] [] SyS_read+0xd9/0x1c0 [ 31.353974] [] ? vfs_copy_file_range+0x850/0x850 [ 31.360357] [] ? do_syscall_64+0x48/0x490 [ 31.366126] [] ? vfs_copy_file_range+0x850/0x850 [ 31.372504] [] do_syscall_64+0x1a6/0x490 [ 31.378198] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.385578] Dumping ftrace buffer: [ 31.389091] (ftrace buffer empty) [ 31.392774] Kernel Offset: disabled [ 31.396371] Rebooting in 86400 seconds..