[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.493417] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.246652] random: sshd: uninitialized urandom read (32 bytes read) [ 15.512628] random: sshd: uninitialized urandom read (32 bytes read) [ 16.289131] random: sshd: uninitialized urandom read (32 bytes read) [ 32.791995] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 38.250650] 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 [ 42.185290] ================================================================== [ 42.192705] BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 [ 42.199082] Read of size 8 at addr ffff8801bdda7820 by task syz-executor055/3806 [ 42.206580] [ 42.208181] CPU: 1 PID: 3806 Comm: syz-executor055 Not tainted 4.9.97-g2bcbbd5 #14 [ 42.215865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.225190] ffff8801d946f058 ffffffff81eb0b69 ffffea0006f769c0 ffff8801bdda7820 [ 42.233165] 0000000000000000 ffff8801bdda7828 ffff8801d946f190 ffff8801d946f090 [ 42.241143] ffffffff8156540b ffff8801bdda7820 0000000000000008 0000000000000000 [ 42.249121] Call Trace: [ 42.251682] [] dump_stack+0xc1/0x128 [ 42.257018] [] print_address_description+0x6c/0x234 [ 42.263654] [] kasan_report.cold.6+0x242/0x2fe [ 42.269858] [] ? __unwind_start+0x37c/0x3c0 [ 42.275805] [] __asan_report_load8_noabort+0x14/0x20 executing program [ 42.282525] [] __unwind_start+0x37c/0x3c0 [ 42.288292] [] ? ptrace_may_access+0x24/0x50 [ 42.294321] [] __save_stack_trace+0x59/0xf0 [ 42.300264] [] save_stack_trace_tsk+0x48/0x70 [ 42.306381] [] proc_pid_stack+0x148/0x220 [ 42.312149] [] ? lock_trace+0xc0/0xc0 [ 42.317570] [] proc_single_show+0xfd/0x170 [ 42.323426] [] traverse+0x363/0x920 [ 42.328673] [] ? seq_buf_alloc+0x80/0x80 executing program [ 42.334354] [] ? __lock_is_held+0xa2/0xf0 [ 42.340122] [] seq_read+0xd19/0x12e0 [ 42.345455] [] ? seq_dentry+0x290/0x290 [ 42.351053] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 42.359509] [] ? fsnotify+0x1100/0x1100 [ 42.365103] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 42.371997] [] do_readv_writev+0x565/0x7a0 [ 42.377850] [] ? vfs_write+0x530/0x530 executing program [ 42.383356] [] ? kasan_unpoison_shadow+0x35/0x50 [ 42.389731] [] ? push_pipe+0x3f4/0x780 [ 42.395238] [] ? iov_iter_get_pages_alloc+0x2bb/0xf10 [ 42.402050] [] vfs_readv+0x84/0xc0 [ 42.407211] [] default_file_splice_read+0x44b/0x7e0 [ 42.413848] [] ? do_splice_direct+0x270/0x270 [ 42.419965] [] ? __might_sleep+0x95/0x1a0 [ 42.425733] [] ? futex_wait_queue_me+0x3d1/0x5c0 executing program [ 42.432106] [] ? refill_pi_state_cache.part.8+0x200/0x200 [ 42.439263] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.446075] [] ? security_file_permission+0x8f/0x1f0 [ 42.452796] [] ? do_splice_direct+0x270/0x270 [ 42.458909] [] do_splice_to+0x10c/0x170 [ 42.464504] [] splice_direct_to_actor+0x23f/0x7e0 [ 42.470964] [] ? pipe_to_sendpage+0x330/0x330 [ 42.477078] [] ? do_splice_to+0x170/0x170 [ 42.482846] [] ? security_file_permission+0x8f/0x1f0 [ 42.489569] [] ? rw_verify_area+0xe5/0x2b0 [ 42.495426] [] do_splice_direct+0x1a3/0x270 [ 42.501368] [] ? splice_direct_to_actor+0x7e0/0x7e0 [ 42.508017] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 42.514568] [] ? __sb_start_write+0x161/0x300 [ 42.520684] [] do_sendfile+0x4f0/0xc60 [ 42.526191] [] ? do_compat_pwritev64+0x180/0x180 executing program [ 42.532568] [] ? __might_fault+0x114/0x1d0 [ 42.538425] [] SyS_sendfile64+0xd1/0x160 [ 42.544107] [] ? SyS_sendfile+0x160/0x160 [ 42.549884] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.556690] [] ? do_syscall_64+0x48/0x490 [ 42.562459] [] ? SyS_sendfile+0x160/0x160 [ 42.568227] [] do_syscall_64+0x1a6/0x490 [ 42.573911] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 42.580807] executing program [ 42.582405] The buggy address belongs to the page: [ 42.587305] page:ffffea0006f769c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 42.595534] flags: 0x8000000000000000() [ 42.599475] page dumped because: kasan: bad access detected [ 42.605151] [ 42.606746] Memory state around the buggy address: [ 42.611644] ffff8801bdda7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.618971] ffff8801bdda7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.626313] >ffff8801bdda7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.626315] ^ [ 42.626318] ffff8801bdda7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.626321] ffff8801bdda7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.626322] ================================================================== [ 42.626323] Disabling lock debugging due to kernel taint [ 42.626839] Kernel panic - not syncing: panic_on_warn set ... [ 42.626839] [ 42.626845] CPU: 1 PID: 3806 Comm: syz-executor055 Tainted: G B 4.9.97-g2bcbbd5 #14 [ 42.626847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.626854] ffff8801d946efb8 ffffffff81eb0b69 ffffffff843c4d05 00000000ffffffff [ 42.626859] 0000000000000000 0000000000000001 ffff8801d946f190 ffff8801d946f078 [ 42.626865] ffffffff8141f975 0000000041b58ab3 ffffffff843b8408 ffffffff8141f7b6 [ 42.626866] Call Trace: [ 42.626872] [] dump_stack+0xc1/0x128 [ 42.626878] [] panic+0x1bf/0x3bc [ 42.626882] [] ? add_taint.cold.6+0x16/0x16 [ 42.626886] [] ? ___preempt_schedule+0x16/0x18 [ 42.626891] [] kasan_end_report+0x47/0x4f [ 42.626894] [] kasan_report.cold.6+0x76/0x2fe [ 42.626900] [] ? __unwind_start+0x37c/0x3c0 [ 42.626905] [] __asan_report_load8_noabort+0x14/0x20 [ 42.626909] [] __unwind_start+0x37c/0x3c0 [ 42.626914] [] ? ptrace_may_access+0x24/0x50 [ 42.626918] [] __save_stack_trace+0x59/0xf0 [ 42.626922] [] save_stack_trace_tsk+0x48/0x70 [ 42.626928] [] proc_pid_stack+0x148/0x220 [ 42.626932] [] ? lock_trace+0xc0/0xc0 [ 42.626936] [] proc_single_show+0xfd/0x170 [ 42.626941] [] traverse+0x363/0x920 [ 42.626945] [] ? seq_buf_alloc+0x80/0x80 [ 42.626950] [] ? __lock_is_held+0xa2/0xf0 [ 42.626955] [] seq_read+0xd19/0x12e0 [ 42.626959] [] ? seq_dentry+0x290/0x290 [ 42.626965] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 42.626969] [] ? fsnotify+0x1100/0x1100 [ 42.626974] [] do_loop_readv_writev.part.18+0xd5/0x280 [ 42.626978] [] do_readv_writev+0x565/0x7a0 [ 42.626982] [] ? vfs_write+0x530/0x530 [ 42.626986] [] ? kasan_unpoison_shadow+0x35/0x50 [ 42.626991] [] ? push_pipe+0x3f4/0x780 [ 42.626996] [] ? iov_iter_get_pages_alloc+0x2bb/0xf10 [ 42.627000] [] vfs_readv+0x84/0xc0 [ 42.627005] [] default_file_splice_read+0x44b/0x7e0 [ 42.627009] [] ? do_splice_direct+0x270/0x270 [ 42.627014] [] ? __might_sleep+0x95/0x1a0 [ 42.627020] [] ? futex_wait_queue_me+0x3d1/0x5c0 [ 42.627024] [] ? refill_pi_state_cache.part.8+0x200/0x200 [ 42.627028] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.627035] [] ? security_file_permission+0x8f/0x1f0 [ 42.627039] [] ? do_splice_direct+0x270/0x270 [ 42.627043] [] do_splice_to+0x10c/0x170 [ 42.627047] [] splice_direct_to_actor+0x23f/0x7e0 [ 42.627051] [] ? pipe_to_sendpage+0x330/0x330 [ 42.627055] [] ? do_splice_to+0x170/0x170 [ 42.627059] [] ? security_file_permission+0x8f/0x1f0 [ 42.627063] [] ? rw_verify_area+0xe5/0x2b0 [ 42.627067] [] do_splice_direct+0x1a3/0x270 [ 42.627071] [] ? splice_direct_to_actor+0x7e0/0x7e0 [ 42.627077] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 42.627081] [] ? __sb_start_write+0x161/0x300 [ 42.627085] [] do_sendfile+0x4f0/0xc60 [ 42.627089] [] ? do_compat_pwritev64+0x180/0x180 [ 42.627094] [] ? __might_fault+0x114/0x1d0 [ 42.627098] [] SyS_sendfile64+0xd1/0x160 [ 42.627102] [] ? SyS_sendfile+0x160/0x160 [ 42.627106] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.627110] [] ? do_syscall_64+0x48/0x490 [ 42.627114] [] ? SyS_sendfile+0x160/0x160 [ 42.627117] [] do_syscall_64+0x1a6/0x490 [ 42.627122] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 42.634064] Dumping ftrace buffer: [ 42.634067] (ftrace buffer empty) [ 42.634068] Kernel Offset: disabled [ 43.072426] Rebooting in 86400 seconds..