[....] Starting OpenBSD Secure Shell server: sshd[ 11.402005] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 40.400915] random: sshd: uninitialized urandom read (32 bytes read) [ 40.875221] audit: type=1400 audit(1569315868.037:6): avc: denied { map } for pid=1777 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 40.925323] random: sshd: uninitialized urandom read (32 bytes read) [ 41.451727] random: sshd: uninitialized urandom read (32 bytes read) [ 41.652003] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.149' (ECDSA) to the list of known hosts. [ 47.121712] 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 [ 47.223397] audit: type=1400 audit(1569315874.387:7): avc: denied { map } for pid=1795 comm="syz-executor814" path="/root/syz-executor814410779" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.770668] ================================================================== [ 49.778363] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x169f/0x1810 [ 49.785725] Read of size 8 at addr ffff8881c3007860 by task syz-executor814/2365 [ 49.793752] [ 49.795379] CPU: 0 PID: 2365 Comm: syz-executor814 Not tainted 4.14.146+ #0 [ 49.802478] Call Trace: [ 49.805080] dump_stack+0xca/0x134 [ 49.808632] ? unwind_next_frame+0x169f/0x1810 [ 49.813224] ? unwind_next_frame+0x169f/0x1810 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.817809] print_address_description+0x60/0x226 [ 49.822664] ? unwind_next_frame+0x169f/0x1810 [ 49.827258] ? unwind_next_frame+0x169f/0x1810 [ 49.831845] __kasan_report.cold+0x1a/0x41 [ 49.836114] ? unwind_next_frame+0x169f/0x1810 [ 49.840705] unwind_next_frame+0x169f/0x1810 [ 49.845118] ? retint_kernel+0x2d/0x2d [ 49.849051] ? perf_callchain_user+0x4a7/0xf80 [ 49.853642] ? deref_stack_reg+0xe0/0xe0 [ 49.857717] ? perf_callchain_user+0x2d1/0xf80 [ 49.862513] ? retint_kernel+0x2d/0x2d [ 49.866414] perf_callchain_kernel+0x3a0/0x540 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.871001] ? perf_callchain_kernel+0x540/0x540 [ 49.875793] ? arch_perf_update_userpage+0x330/0x330 [ 49.880908] ? futex_wait_setup+0x132/0x330 [ 49.885242] get_perf_callchain+0x2f5/0x770 [ 49.889575] ? put_callchain_buffers+0x60/0x60 [ 49.894166] ? perf_callchain+0x150/0x190 [ 49.898326] perf_callchain+0x147/0x190 [ 49.902743] perf_prepare_sample+0x6a8/0x1360 [ 49.907249] ? perf_output_sample+0x1700/0x1700 [ 49.911927] ? perf_prepare_sample+0x1360/0x1360 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.916803] ? perf_event_output_forward+0x12f/0x220 [ 49.921922] ? lock_downgrade+0x5d0/0x5d0 [ 49.926081] perf_event_output_forward+0xdc/0x220 [ 49.930971] ? perf_prepare_sample+0x1360/0x1360 [ 49.935737] ? __perf_event_overflow+0x1cc/0x340 [ 49.940498] ? check_preemption_disabled+0x35/0x1f0 [ 49.945524] __perf_event_overflow+0x12d/0x340 [ 49.950119] perf_swevent_overflow+0x7a/0xf0 [ 49.954535] perf_swevent_event+0x112/0x270 [ 49.958870] perf_tp_event+0x633/0x7f0 [ 49.962775] ? perf_swevent_put_recursion_context+0xa0/0xa0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.968499] ? trace_hardirqs_on+0x10/0x10 [ 49.972743] ? __lock_acquire+0x5d7/0x4320 [ 49.976995] ? perf_trace_run_bpf_submit+0x113/0x170 [ 49.982109] ? check_preemption_disabled+0x35/0x1f0 [ 49.987133] perf_trace_run_bpf_submit+0x113/0x170 [ 49.992083] perf_trace_lock_acquire+0x341/0x4e0 [ 49.996960] ? HARDIRQ_verbose+0x10/0x10 [ 50.001028] ? retint_kernel+0x2d/0x2d [ 50.004925] ? get_futex_key+0x4c1/0xf90 [ 50.009012] lock_acquire+0x279/0x360 [ 50.012830] ? futex_wait_setup+0x132/0x330 [ 50.017196] _raw_spin_lock+0x2a/0x40 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.021028] ? futex_wait_setup+0x132/0x330 [ 50.025356] futex_wait_setup+0x132/0x330 [ 50.029516] ? futex_wake+0x440/0x440 [ 50.033325] futex_wait+0x1ad/0x570 [ 50.036965] ? futex_wait_setup+0x330/0x330 [ 50.041464] ? wake_up_q+0xea/0x150 [ 50.045098] ? drop_futex_key_refs.isra.0+0x17/0xb0 [ 50.050128] ? futex_wake+0x15b/0x440 [ 50.053942] ? HARDIRQ_verbose+0x10/0x10 [ 50.058006] ? SyS_perf_event_open+0x1a4d/0x2560 [ 50.062773] do_futex+0x13f/0x1980 [ 50.066320] ? lock_downgrade+0x5d0/0x5d0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.070473] ? lock_acquire+0x12b/0x360 [ 50.074454] ? check_preemption_disabled+0x35/0x1f0 [ 50.079485] ? exit_robust_list+0x240/0x240 [ 50.083820] ? __mutex_unlock_slowpath+0xff/0x690 [ 50.088671] ? get_unused_fd_flags+0xc0/0xc0 [ 50.093083] ? SyS_perf_event_open+0x19c3/0x2560 [ 50.097849] ? wait_for_completion_io+0x10/0x10 [ 50.102525] ? mark_held_locks+0xa6/0xf0 [ 50.106594] ? do_raw_spin_lock+0xb4/0x1d0 [ 50.110845] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 50.115958] ? SyS_perf_event_open+0x633/0x2560 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.120638] SyS_futex+0x1c5/0x2c3 [ 50.124195] ? do_futex+0x1980/0x1980 [ 50.128004] ? do_syscall_64+0x43/0x520 [ 50.131985] ? do_futex+0x1980/0x1980 [ 50.135790] do_syscall_64+0x19b/0x520 [ 50.139799] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 50.145632] RIP: 0033:0x4467e9 [ 50.148825] RSP: 002b:00007f62e97c7db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 50.156533] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467e9 [ 50.163820] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.171094] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 50.178363] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 50.185767] R13: 00007ffd7bee07ef R14: 00007f62e97c89c0 R15: 0000000000000000 [ 50.193040] [ 50.194664] The buggy address belongs to the page: [ 50.199591] page:ffffea00070c01c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 50.207733] flags: 0x4000000000000000() [ 50.211712] raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.219597] raw: 0000000000000000 ffffea00070c01e0 0000000000000000 0000000000000000 [ 50.227483] page dumped because: kasan: bad access detected [ 50.233192] [ 50.234823] Memory state around the buggy address: [ 50.239754] ffff8881c3007700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 50.247117] ffff8881c3007780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 50.254595] >ffff8881c3007800: 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3 00 [ 50.261954] ^ executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.268448] ffff8881c3007880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 50.275896] ffff8881c3007900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 50.283259] ================================================================== [ 50.290647] Disabling lock debugging due to kernel taint [ 50.296096] Kernel panic - not syncing: panic_on_warn set ... [ 50.296096] [ 50.303469] CPU: 0 PID: 2365 Comm: syz-executor814 Tainted: G B 4.14.146+ #0 [ 50.311786] Call Trace: [ 50.314384] dump_stack+0xca/0x134 [ 50.317932] panic+0x1ea/0x3d3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.321228] ? add_taint.cold+0x16/0x16 [ 50.325209] ? lock_downgrade+0x5d0/0x5d0 [ 50.329377] ? unwind_next_frame+0x169f/0x1810 [ 50.334059] end_report+0x43/0x49 [ 50.337579] ? unwind_next_frame+0x169f/0x1810 [ 50.342166] __kasan_report.cold+0xd/0x41 [ 50.346325] ? unwind_next_frame+0x169f/0x1810 [ 50.351001] unwind_next_frame+0x169f/0x1810 [ 50.355519] ? retint_kernel+0x2d/0x2d [ 50.359410] ? perf_callchain_user+0x4a7/0xf80 [ 50.364003] ? deref_stack_reg+0xe0/0xe0 [ 50.368354] ? perf_callchain_user+0x2d1/0xf80 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.373029] ? retint_kernel+0x2d/0x2d [ 50.376928] perf_callchain_kernel+0x3a0/0x540 [ 50.381520] ? perf_callchain_kernel+0x540/0x540 [ 50.386293] ? arch_perf_update_userpage+0x330/0x330 [ 50.391406] ? futex_wait_setup+0x132/0x330 [ 50.395753] get_perf_callchain+0x2f5/0x770 [ 50.400187] ? put_callchain_buffers+0x60/0x60 [ 50.404785] ? perf_callchain+0x150/0x190 [ 50.408947] perf_callchain+0x147/0x190 [ 50.412933] perf_prepare_sample+0x6a8/0x1360 [ 50.417437] ? perf_output_sample+0x1700/0x1700 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.422288] ? perf_prepare_sample+0x1360/0x1360 [ 50.427052] ? perf_event_output_forward+0x12f/0x220 [ 50.432198] ? lock_downgrade+0x5d0/0x5d0 [ 50.436360] perf_event_output_forward+0xdc/0x220 [ 50.441339] ? perf_prepare_sample+0x1360/0x1360 [ 50.446104] ? __perf_event_overflow+0x1cc/0x340 [ 50.450869] ? check_preemption_disabled+0x35/0x1f0 [ 50.455897] __perf_event_overflow+0x12d/0x340 [ 50.460493] perf_swevent_overflow+0x7a/0xf0 [ 50.464911] perf_swevent_event+0x112/0x270 [ 50.469242] perf_tp_event+0x633/0x7f0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.473140] ? perf_swevent_put_recursion_context+0xa0/0xa0 [ 50.478875] ? trace_hardirqs_on+0x10/0x10 [ 50.483121] ? __lock_acquire+0x5d7/0x4320 [ 50.487368] ? perf_trace_run_bpf_submit+0x113/0x170 [ 50.496124] ? check_preemption_disabled+0x35/0x1f0 [ 50.501321] perf_trace_run_bpf_submit+0x113/0x170 [ 50.506259] perf_trace_lock_acquire+0x341/0x4e0 [ 50.511032] ? HARDIRQ_verbose+0x10/0x10 [ 50.515094] ? retint_kernel+0x2d/0x2d [ 50.519118] ? get_futex_key+0x4c1/0xf90 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.523186] lock_acquire+0x279/0x360 [ 50.527861] ? futex_wait_setup+0x132/0x330 [ 50.532191] _raw_spin_lock+0x2a/0x40 [ 50.537052] ? futex_wait_setup+0x132/0x330 [ 50.541376] futex_wait_setup+0x132/0x330 [ 50.545557] ? futex_wake+0x440/0x440 [ 50.549366] futex_wait+0x1ad/0x570 [ 50.552997] ? futex_wait_setup+0x330/0x330 [ 50.557504] ? wake_up_q+0xea/0x150 [ 50.561139] ? drop_futex_key_refs.isra.0+0x17/0xb0 [ 50.566158] ? futex_wake+0x15b/0x440 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.569968] ? HARDIRQ_verbose+0x10/0x10 [ 50.575168] ? SyS_perf_event_open+0x1a4d/0x2560 [ 50.579929] do_futex+0x13f/0x1980 [ 50.583912] ? lock_downgrade+0x5d0/0x5d0 [ 50.588218] ? lock_acquire+0x12b/0x360 [ 50.592342] ? check_preemption_disabled+0x35/0x1f0 [ 50.597628] ? exit_robust_list+0x240/0x240 [ 50.601956] ? __mutex_unlock_slowpath+0xff/0x690 [ 50.606806] ? get_unused_fd_flags+0xc0/0xc0 [ 50.611252] ? SyS_perf_event_open+0x19c3/0x2560 [ 50.616108] ? wait_for_completion_io+0x10/0x10 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.620782] ? mark_held_locks+0xa6/0xf0 [ 50.624930] ? do_raw_spin_lock+0xb4/0x1d0 [ 50.629169] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 50.634278] ? SyS_perf_event_open+0x633/0x2560 [ 50.639091] SyS_futex+0x1c5/0x2c3 [ 50.642639] ? do_futex+0x1980/0x1980 [ 50.646449] ? do_syscall_64+0x43/0x520 [ 50.650432] ? do_futex+0x1980/0x1980 [ 50.654237] do_syscall_64+0x19b/0x520 [ 50.658135] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 50.663325] RIP: 0033:0x4467e9 [ 50.666513] RSP: 002b:00007f62e97c7db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.674405] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467e9 [ 50.681673] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 [ 50.689024] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 50.696486] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 50.703762] R13: 00007ffd7bee07ef R14: 00007f62e97c89c0 R15: 0000000000000000 [ 50.711948] Kernel Offset: 0x1800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 50.722942] Rebooting in 86400 seconds..