[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.361869] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.964383] random: sshd: uninitialized urandom read (32 bytes read) [ 22.217918] random: sshd: uninitialized urandom read (32 bytes read) [ 23.105016] random: sshd: uninitialized urandom read (32 bytes read) [ 40.617103] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 46.258870] 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 [ 55.280578] ================================================================== [ 55.287964] BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 [ 55.294340] Read of size 8 at addr ffff8801cd297828 by task syz-executor273/10177 [ 55.301939] [ 55.303541] CPU: 0 PID: 10177 Comm: syz-executor273 Not tainted 4.9.102-gd054505 #31 [ 55.311552] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.320890] ffff8801b6c4f688 ffffffff81eb3489 ffffea000734a5c0 ffff8801cd297828 [ 55.328899] 0000000000000000 ffff8801cd297830 ffff8801b6c4f7c0 ffff8801b6c4f6c0 [ 55.336885] ffffffff815676bb ffff8801cd297828 0000000000000008 0000000000000000 [ 55.344866] Call Trace: [ 55.347429] [] dump_stack+0xc1/0x128 [ 55.352771] [] print_address_description+0x6c/0x234 [ 55.359409] [] kasan_report.cold.6+0x242/0x2fe [ 55.365611] [] ? __unwind_start+0x37c/0x3c0 [ 55.371656] [] __asan_report_load8_noabort+0x14/0x20 [ 55.378386] [] __unwind_start+0x37c/0x3c0 [ 55.384160] [] ? ptrace_may_access+0x24/0x50 [ 55.390191] [] __save_stack_trace+0x59/0xf0 [ 55.396142] [] save_stack_trace_tsk+0x48/0x70 [ 55.402257] [] proc_pid_stack+0x148/0x220 [ 55.408024] [] ? lock_trace+0xc0/0xc0 [ 55.413446] [] proc_single_show+0xfd/0x170 [ 55.419301] [] traverse+0x363/0x920 [ 55.424547] [] ? seq_buf_alloc+0x80/0x80 [ 55.430230] [] seq_read+0xd19/0x12e0 [ 55.435575] [] ? seq_dentry+0x290/0x290 [ 55.441176] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 55.449635] [] ? fsnotify+0x1100/0x1100 [ 55.455239] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 55.462138] [] do_readv_writev+0x565/0x7a0 [ 55.467992] [] ? vfs_write+0x530/0x530 [ 55.473508] [] ? check_preemption_disabled+0x3b/0x170 [ 55.480319] [] ? __fget+0x20a/0x3b0 [ 55.485565] [] ? __fget+0x231/0x3b0 [ 55.490826] [] ? __fget+0x47/0x3b0 [ 55.495984] [] vfs_readv+0x84/0xc0 [ 55.501144] [] do_preadv+0x197/0x240 [ 55.506489] [] ? do_readv+0x260/0x260 [ 55.511933] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 55.518257] [] SyS_preadv+0x30/0x40 [ 55.523512] [] ? SyS_writev+0x30/0x30 [ 55.528939] [] do_syscall_64+0x1a6/0x490 [ 55.534626] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 55.541520] [ 55.543120] The buggy address belongs to the page: [ 55.548023] page:ffffea000734a5c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 55.556253] flags: 0x8000000000000000() [ 55.560194] page dumped because: kasan: bad access detected [ 55.565885] [ 55.567483] Memory state around the buggy address: [ 55.572380] ffff8801cd297700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 executing program executing program [ 55.579710] ffff8801cd297780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 55.587041] >ffff8801cd297800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 55.594369] ^ [ 55.599267] ffff8801cd297880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 55.606596] ffff8801cd297900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 55.613923] ================================================================== [ 55.621262] Disabling lock debugging due to kernel taint executing program [ 55.632536] Kernel panic - not syncing: panic_on_warn set ... [ 55.632536] [ 55.639919] CPU: 1 PID: 10177 Comm: syz-executor273 Tainted: G B 4.9.102-gd054505 #31 [ 55.649111] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.658536] ffff8801b6c4f5e8 ffffffff81eb3489 ffffffff843c5d7d 00000000ffffffff [ 55.666529] 0000000000000000 0000000000000001 ffff8801b6c4f7c0 ffff8801b6c4f6a8 [ 55.674525] ffffffff81421aa5 0000000041b58ab3 ffffffff843b94b0 ffffffff814218e6 [ 55.682524] Call Trace: [ 55.685091] [] dump_stack+0xc1/0x128 [ 55.690435] [] panic+0x1bf/0x3bc [ 55.695509] [] ? add_taint.cold.6+0x16/0x16 [ 55.701458] [] ? ___preempt_schedule+0x16/0x18 [ 55.707680] [] kasan_end_report+0x47/0x4f [ 55.713450] [] kasan_report.cold.6+0x76/0x2fe [ 55.719586] [] ? __unwind_start+0x37c/0x3c0 [ 55.725536] [] __asan_report_load8_noabort+0x14/0x20 [ 55.732260] [] __unwind_start+0x37c/0x3c0 [ 55.738040] [] ? ptrace_may_access+0x24/0x50 [ 55.744074] [] __save_stack_trace+0x59/0xf0 [ 55.750020] [] save_stack_trace_tsk+0x48/0x70 [ 55.756144] [] proc_pid_stack+0x148/0x220 [ 55.761915] [] ? lock_trace+0xc0/0xc0 [ 55.767344] [] proc_single_show+0xfd/0x170 [ 55.773203] [] traverse+0x363/0x920 [ 55.778456] [] ? seq_buf_alloc+0x80/0x80 [ 55.784142] [] seq_read+0xd19/0x12e0 [ 55.789480] [] ? seq_dentry+0x290/0x290 [ 55.795087] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 55.803558] [] ? fsnotify+0x1100/0x1100 [ 55.809156] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 55.816058] [] do_readv_writev+0x565/0x7a0 [ 55.821918] [] ? vfs_write+0x530/0x530 [ 55.827511] [] ? check_preemption_disabled+0x3b/0x170 [ 55.834326] [] ? __fget+0x20a/0x3b0 [ 55.839578] [] ? __fget+0x231/0x3b0 [ 55.844835] [] ? __fget+0x47/0x3b0 [ 55.850008] [] vfs_readv+0x84/0xc0 [ 55.855178] [] do_preadv+0x197/0x240 [ 55.860516] [] ? do_readv+0x260/0x260 [ 55.865943] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 55.872236] [] SyS_preadv+0x30/0x40 [ 55.877486] [] ? SyS_writev+0x30/0x30 [ 55.882909] [] do_syscall_64+0x1a6/0x490 [ 55.888594] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 55.896015] Dumping ftrace buffer: [ 55.899534] (ftrace buffer empty) [ 55.903233] Kernel Offset: disabled [ 55.906936] Rebooting in 86400 seconds..