[ OK ] Found device /dev/ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 28.538201] hrtimer: interrupt took 44782 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.280509] ================================================================== [ 29.287908] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x13c2/0x17d0 [ 29.295288] Read of size 8 at addr ffff8880ba507c90 by task syz-executor100/8002 [ 29.302805] [ 29.304424] CPU: 1 PID: 8002 Comm: syz-executor100 Not tainted 4.14.218-syzkaller #0 [ 29.312288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.321630] Call Trace: [ 29.324202] [ 29.326362] dump_stack+0x1b2/0x281 executing program [ 29.329985] print_address_description.cold+0x54/0x1d3 [ 29.335262] kasan_report_error.cold+0x8a/0x191 [ 29.339934] ? unwind_next_frame+0x13c2/0x17d0 [ 29.344510] __asan_report_load8_noabort+0x68/0x70 [ 29.349427] ? unwind_next_frame+0x13c2/0x17d0 [ 29.354030] unwind_next_frame+0x13c2/0x17d0 [ 29.358460] ? page_fault+0x45/0x50 [ 29.362064] ? kernel_text_address+0xbd/0xf0 [ 29.366497] ? deref_stack_reg+0x1a0/0x1a0 [ 29.370790] ? check_preemption_disabled+0x35/0x240 [ 29.375874] ? page_fault+0x45/0x50 [ 29.379491] perf_callchain_kernel+0x38c/0x520 [ 29.384057] ? perf_callchain_user+0x2a9/0xc60 [ 29.388621] ? arch_perf_update_userpage+0x300/0x300 [ 29.393715] ? page_fault+0x45/0x50 [ 29.397354] ? get_perf_callchain+0x56e/0x740 [ 29.401825] ? check_preemption_disabled+0x35/0x240 [ 29.406824] get_perf_callchain+0x2de/0x740 [ 29.411130] ? put_callchain_buffers+0x60/0x60 [ 29.415697] ? tracing_generic_entry_update+0x162/0x1d0 [ 29.421045] ? perf_swevent_event+0xf8/0x460 [ 29.425446] perf_callchain+0x147/0x190 [ 29.429397] perf_prepare_sample+0xd77/0x1380 [ 29.433895] ? perf_output_sample+0x16f0/0x16f0 [ 29.438544] ? perf_event_output_forward+0x143/0x1f0 [ 29.443654] perf_event_output_forward+0xc9/0x1f0 [ 29.448494] ? perf_prepare_sample+0x1380/0x1380 [ 29.453279] ? check_preemption_disabled+0x35/0x240 [ 29.458280] ? check_preemption_disabled+0x35/0x240 [ 29.463311] __perf_event_overflow+0x113/0x310 [ 29.467895] perf_swevent_event+0x3c8/0x460 [ 29.472217] perf_tp_event+0x540/0x6e0 [ 29.476088] ? __lock_acquire+0x5fc/0x3f20 [ 29.480309] ? perf_swevent_event+0x460/0x460 [ 29.484795] ? perf_trace_run_bpf_submit+0x119/0x200 [ 29.489893] ? HARDIRQ_verbose+0x10/0x10 [ 29.493940] ? __save_stack_trace+0x63/0x160 [ 29.498340] ? deref_stack_reg+0x124/0x1a0 [ 29.502552] ? is_bpf_text_address+0x91/0x150 [ 29.507022] ? lock_acquire+0x170/0x3f0 [ 29.510984] ? lock_downgrade+0x740/0x740 [ 29.515118] ? __lock_acquire+0x5fc/0x3f20 [ 29.519331] ? perf_trace_run_bpf_submit+0x119/0x200 [ 29.524420] ? check_preemption_disabled+0x35/0x240 [ 29.529420] ? check_preemption_disabled+0x35/0x240 [ 29.534417] perf_trace_run_bpf_submit+0x119/0x200 [ 29.539329] perf_trace_lock_acquire+0x332/0x510 [ 29.544065] ? smp_apic_timer_interrupt+0x141/0x5e0 [ 29.549106] ? HARDIRQ_verbose+0x10/0x10 [ 29.553149] ? page_fault+0x45/0x50 [ 29.556765] ? debug_object_active_state+0x236/0x330 [ 29.561847] lock_acquire+0x2b8/0x3f0 [ 29.565629] ? debug_object_deactivate+0xdf/0x2e0 [ 29.570492] _raw_spin_lock_irqsave+0x8c/0xc0 [ 29.575007] ? debug_object_deactivate+0xdf/0x2e0 [ 29.579852] debug_object_deactivate+0xdf/0x2e0 [ 29.584505] ? debug_stats_show+0xd0/0xd0 [ 29.588660] ? lock_downgrade+0x740/0x740 [ 29.592801] ? rcu_process_callbacks+0x780/0x1180 [ 29.597658] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 29.602653] ? get_max_files+0x10/0x10 [ 29.606534] rcu_process_callbacks+0x83c/0x1180 [ 29.611177] ? note_gp_changes+0x2f0/0x2f0 [ 29.615389] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 29.620830] __do_softirq+0x24d/0x9ff [ 29.624624] ? check_preemption_disabled+0x35/0x240 [ 29.629640] irq_exit+0x193/0x240 [ 29.633094] smp_apic_timer_interrupt+0x141/0x5e0 [ 29.637924] apic_timer_interrupt+0x93/0xa0 [ 29.642219] [ 29.644449] RIP: 0010:lock_acquire+0x1ec/0x3f0 [ 29.649009] RSP: 0000:ffff888095cefa88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 [ 29.656711] RAX: 1ffffffff11e1251 RBX: ffff88809b588280 RCX: 6e589fa09c8ac93c [ 29.663975] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 [ 29.671231] RBP: ffffffff88f776c0 R08: 0000000000000000 R09: 0000000000020012 [ 29.678582] R10: ffff88809b588b80 R11: ffff88809b588280 R12: 0000000000000000 [ 29.685834] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 [ 29.693094] lock_page_memcg+0x36/0x200 [ 29.697050] ? mem_cgroup_id_get_online+0xb0/0xb0 [ 29.701912] page_add_file_rmap+0x29/0x860 [ 29.706730] alloc_set_pte+0x38f/0x1610 [ 29.710709] filemap_map_pages+0xa2d/0xe40 [ 29.714936] ? generic_file_mmap+0x140/0x140 [ 29.719378] ? __lock_acquire+0x5fc/0x3f20 [ 29.723705] ? perf_trace_run_bpf_submit+0x119/0x200 [ 29.728798] ? check_preemption_disabled+0x35/0x240 [ 29.733856] do_fault_around+0x1fe/0x620 [ 29.737924] __handle_mm_fault+0x2b1f/0x4620 [ 29.742320] ? vm_insert_page+0x7c0/0x7c0 [ 29.746453] ? HARDIRQ_verbose+0x10/0x10 [ 29.750518] handle_mm_fault+0x391/0x860 [ 29.754569] __do_page_fault+0x549/0xad0 [ 29.758618] ? spurious_fault+0x640/0x640 [ 29.762756] ? do_page_fault+0x60/0x500 [ 29.766725] ? page_fault+0x2f/0x50 [ 29.770414] page_fault+0x45/0x50 [ 29.773871] RIP: 0001:0x4b0da0 [ 29.777040] RSP: 0001:00007fff9db42ad0 EFLAGS: 00000000 [ 29.777047] [ 29.784021] The buggy address belongs to the page: [ 29.788943] page:ffffea0002e941c0 count:1 mapcount:0 mapping: (null) index:0x0 [ 29.797067] flags: 0xfff00000000800(reserved) [ 29.801578] raw: 00fff00000000800 0000000000000000 0000000000000000 00000001ffffffff [ 29.809465] raw: ffffea0002e941e0 ffffea0002e941e0 0000000000000000 0000000000000000 [ 29.817340] page dumped because: kasan: bad access detected [ 29.823033] [ 29.824638] Memory state around the buggy address: [ 29.829561] ffff8880ba507b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.837181] ffff8880ba507c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 [ 29.844541] >ffff8880ba507c80: f1 f1 f1 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 [ 29.854837] ^ [ 29.858709] ffff8880ba507d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.866057] ffff8880ba507d80: 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 f3 f3 [ 29.873400] ================================================================== [ 29.880739] Disabling lock debugging due to kernel taint [ 29.886171] Kernel panic - not syncing: panic_on_warn set ... [ 29.886171] [ 29.893522] CPU: 1 PID: 8002 Comm: syz-executor100 Tainted: G B 4.14.218-syzkaller #0 [ 29.902616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.911959] Call Trace: [ 29.914526] [ 29.916675] dump_stack+0x1b2/0x281 [ 29.920299] panic+0x1f9/0x42d [ 29.923494] ? add_taint.cold+0x16/0x16 [ 29.927453] ? lock_downgrade+0x740/0x740 [ 29.931602] kasan_end_report+0x43/0x49 [ 29.935583] kasan_report_error.cold+0xa7/0x191 [ 29.940243] ? unwind_next_frame+0x13c2/0x17d0 [ 29.944807] __asan_report_load8_noabort+0x68/0x70 [ 29.949726] ? unwind_next_frame+0x13c2/0x17d0 [ 29.954296] unwind_next_frame+0x13c2/0x17d0 [ 29.958719] ? page_fault+0x45/0x50 [ 29.962333] ? kernel_text_address+0xbd/0xf0 [ 29.966741] ? deref_stack_reg+0x1a0/0x1a0 [ 29.970957] ? check_preemption_disabled+0x35/0x240 [ 29.976823] ? page_fault+0x45/0x50 [ 29.980435] perf_callchain_kernel+0x38c/0x520 [ 29.985011] ? perf_callchain_user+0x2a9/0xc60 [ 29.989579] ? arch_perf_update_userpage+0x300/0x300 [ 29.994665] ? page_fault+0x45/0x50 [ 29.998278] ? get_perf_callchain+0x56e/0x740 [ 30.002754] ? check_preemption_disabled+0x35/0x240 [ 30.007770] get_perf_callchain+0x2de/0x740 [ 30.012092] ? put_callchain_buffers+0x60/0x60 [ 30.016680] ? tracing_generic_entry_update+0x162/0x1d0 [ 30.022126] ? perf_swevent_event+0xf8/0x460 [ 30.026532] perf_callchain+0x147/0x190 [ 30.030487] perf_prepare_sample+0xd77/0x1380 [ 30.034977] ? perf_output_sample+0x16f0/0x16f0 [ 30.039632] ? perf_event_output_forward+0x143/0x1f0 [ 30.044723] perf_event_output_forward+0xc9/0x1f0 [ 30.049553] ? perf_prepare_sample+0x1380/0x1380 [ 30.054294] ? check_preemption_disabled+0x35/0x240 [ 30.059301] ? check_preemption_disabled+0x35/0x240 [ 30.064308] __perf_event_overflow+0x113/0x310 [ 30.068878] perf_swevent_event+0x3c8/0x460 [ 30.073185] perf_tp_event+0x540/0x6e0 [ 30.077075] ? __lock_acquire+0x5fc/0x3f20 [ 30.081303] ? perf_swevent_event+0x460/0x460 [ 30.085800] ? perf_trace_run_bpf_submit+0x119/0x200 [ 30.090894] ? HARDIRQ_verbose+0x10/0x10 [ 30.094932] ? __save_stack_trace+0x63/0x160 [ 30.099317] ? deref_stack_reg+0x124/0x1a0 [ 30.103541] ? is_bpf_text_address+0x91/0x150 [ 30.108035] ? lock_acquire+0x170/0x3f0 [ 30.112009] ? lock_downgrade+0x740/0x740 [ 30.116151] ? __lock_acquire+0x5fc/0x3f20 [ 30.120380] ? perf_trace_run_bpf_submit+0x119/0x200 [ 30.125473] ? check_preemption_disabled+0x35/0x240 [ 30.130464] ? check_preemption_disabled+0x35/0x240 [ 30.135470] perf_trace_run_bpf_submit+0x119/0x200 [ 30.140383] perf_trace_lock_acquire+0x332/0x510 [ 30.145119] ? smp_apic_timer_interrupt+0x141/0x5e0 [ 30.150114] ? HARDIRQ_verbose+0x10/0x10 [ 30.154168] ? page_fault+0x45/0x50 [ 30.157780] ? debug_object_active_state+0x236/0x330 [ 30.162875] lock_acquire+0x2b8/0x3f0 [ 30.166676] ? debug_object_deactivate+0xdf/0x2e0 [ 30.171496] _raw_spin_lock_irqsave+0x8c/0xc0 [ 30.175966] ? debug_object_deactivate+0xdf/0x2e0 [ 30.180790] debug_object_deactivate+0xdf/0x2e0 [ 30.185435] ? debug_stats_show+0xd0/0xd0 [ 30.189560] ? lock_downgrade+0x740/0x740 [ 30.193684] ? rcu_process_callbacks+0x780/0x1180 [ 30.198502] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 30.203504] ? get_max_files+0x10/0x10 [ 30.207377] rcu_process_callbacks+0x83c/0x1180 [ 30.212050] ? note_gp_changes+0x2f0/0x2f0 [ 30.216267] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 30.221693] __do_softirq+0x24d/0x9ff [ 30.225489] ? check_preemption_disabled+0x35/0x240 [ 30.230519] irq_exit+0x193/0x240 [ 30.233947] smp_apic_timer_interrupt+0x141/0x5e0 [ 30.238781] apic_timer_interrupt+0x93/0xa0 [ 30.243074] [ 30.245292] RIP: 0010:lock_acquire+0x1ec/0x3f0 [ 30.249847] RSP: 0000:ffff888095cefa88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 [ 30.257528] RAX: 1ffffffff11e1251 RBX: ffff88809b588280 RCX: 6e589fa09c8ac93c [ 30.264789] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 [ 30.272050] RBP: ffffffff88f776c0 R08: 0000000000000000 R09: 0000000000020012 [ 30.279311] R10: ffff88809b588b80 R11: ffff88809b588280 R12: 0000000000000000 [ 30.286558] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 [ 30.293813] lock_page_memcg+0x36/0x200 [ 30.297785] ? mem_cgroup_id_get_online+0xb0/0xb0 [ 30.302616] page_add_file_rmap+0x29/0x860 [ 30.306827] alloc_set_pte+0x38f/0x1610 [ 30.310782] filemap_map_pages+0xa2d/0xe40 [ 30.315001] ? generic_file_mmap+0x140/0x140 [ 30.319399] ? __lock_acquire+0x5fc/0x3f20 [ 30.323625] ? perf_trace_run_bpf_submit+0x119/0x200 [ 30.328719] ? check_preemption_disabled+0x35/0x240 [ 30.333718] do_fault_around+0x1fe/0x620 [ 30.337773] __handle_mm_fault+0x2b1f/0x4620 [ 30.342172] ? vm_insert_page+0x7c0/0x7c0 [ 30.346405] ? HARDIRQ_verbose+0x10/0x10 [ 30.350455] handle_mm_fault+0x391/0x860 [ 30.354511] __do_page_fault+0x549/0xad0 [ 30.358568] ? spurious_fault+0x640/0x640 [ 30.362690] ? do_page_fault+0x60/0x500 [ 30.366675] ? page_fault+0x2f/0x50 [ 30.370276] page_fault+0x45/0x50 [ 30.373705] RIP: 0001:0x4b0da0 [ 30.376891] RSP: 0001:00007fff9db42ad0 EFLAGS: 00000000 [ 30.377290] Kernel Offset: disabled [ 30.386238] Rebooting in 86400 seconds..