Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.76' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 31.760087] ================================================================== [ 31.767482] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1360/0x17d0 [ 31.774874] Read of size 8 at addr ffff8880ba407ca8 by task syz-executor113/8609 [ 31.782393] [ 31.784015] CPU: 0 PID: 8609 Comm: syz-executor113 Not tainted 4.14.228-syzkaller #0 [ 31.791907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.801252] Call Trace: [ 31.803827] [ 31.805975] dump_stack+0x1b2/0x281 [ 31.809623] print_address_description.cold+0x54/0x1d3 [ 31.815002] kasan_report_error.cold+0x8a/0x191 [ 31.819671] ? unwind_next_frame+0x1360/0x17d0 [ 31.824254] __asan_report_load8_noabort+0x68/0x70 [ 31.829178] ? unwind_next_frame+0x1360/0x17d0 [ 31.833782] unwind_next_frame+0x1360/0x17d0 [ 31.838215] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.843575] ? deref_stack_reg+0x1a0/0x1a0 [ 31.847839] ? perf_output_copy+0x210/0x210 [ 31.852157] ? check_preemption_disabled+0x35/0x240 [ 31.857169] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.862529] perf_callchain_kernel+0x38c/0x520 [ 31.867110] ? arch_perf_update_userpage+0x300/0x300 [ 31.872212] ? check_preemption_disabled+0x35/0x240 [ 31.877223] ? kernel_text_address+0xbd/0xf0 [ 31.881630] ? check_preemption_disabled+0x35/0x240 [ 31.886644] get_perf_callchain+0x2de/0x740 [ 31.890963] ? put_callchain_buffers+0x60/0x60 [ 31.895543] ? perf_tp_event+0x3e0/0x6e0 [ 31.899606] perf_callchain+0x147/0x190 [ 31.903585] perf_prepare_sample+0xd77/0x1380 [ 31.908076] ? perf_event_output_forward+0x143/0x1f0 [ 31.913176] ? perf_output_sample+0x16f0/0x16f0 [ 31.917844] perf_event_output_forward+0xc9/0x1f0 [ 31.922703] ? perf_prepare_sample+0x1380/0x1380 [ 31.927452] ? __perf_event_overflow+0x1b6/0x310 [ 31.932205] ? check_preemption_disabled+0x35/0x240 [ 31.937241] __perf_event_overflow+0x113/0x310 [ 31.941832] perf_swevent_event+0x3c8/0x460 [ 31.946155] perf_tp_event+0x540/0x6e0 [ 31.950039] ? perf_swevent_event+0x460/0x460 [ 31.954553] ? perf_trace_run_bpf_submit+0x119/0x200 [ 31.959658] ? trace_hardirqs_on+0x10/0x10 [ 31.963915] ? HARDIRQ_verbose+0x10/0x10 [ 31.967992] ? __save_stack_trace+0x63/0x160 [ 31.972396] ? deref_stack_reg+0x124/0x1a0 [ 31.976630] ? is_bpf_text_address+0x91/0x150 [ 31.981123] ? lock_acquire+0x170/0x3f0 [ 31.985090] ? lock_downgrade+0x740/0x740 [ 31.989240] ? is_bpf_text_address+0xb8/0x150 [ 31.993765] ? kernel_text_address+0xbd/0xf0 [ 31.998172] ? perf_trace_run_bpf_submit+0x119/0x200 [ 32.003269] ? __kernel_text_address+0x9/0x30 [ 32.007779] ? unwind_get_return_address+0x51/0x90 [ 32.012714] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.018070] ? __save_stack_trace+0xa0/0x160 [ 32.022474] ? perf_trace_run_bpf_submit+0x119/0x200 [ 32.027580] ? check_preemption_disabled+0x35/0x240 [ 32.032597] perf_trace_run_bpf_submit+0x119/0x200 [ 32.037524] perf_trace_lock_acquire+0x332/0x510 [ 32.042274] ? apic_timer_interrupt+0x93/0xa0 [ 32.046762] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 32.051858] ? debug_check_no_obj_freed+0x2c0/0x680 [ 32.056894] ? HARDIRQ_verbose+0x10/0x10 [ 32.060953] ? SyS_exit_group+0x19/0x20 [ 32.064923] ? do_syscall_64+0x1d5/0x640 [ 32.068975] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.074333] lock_acquire+0x2b8/0x3f0 [ 32.078135] ? debug_object_active_state+0xe7/0x330 [ 32.083148] _raw_spin_lock_irqsave+0x8c/0xc0 [ 32.087636] ? debug_object_active_state+0xe7/0x330 [ 32.092671] debug_object_active_state+0xe7/0x330 [ 32.097509] ? debug_object_free+0x320/0x320 [ 32.101912] ? lock_downgrade+0x740/0x740 [ 32.106051] ? find_get_pid+0x200/0x200 [ 32.110022] rcu_process_callbacks+0x82d/0x1180 [ 32.114708] ? note_gp_changes+0x2f0/0x2f0 [ 32.118940] ? sched_clock+0x2a/0x40 [ 32.122650] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 32.128097] __do_softirq+0x24d/0x9ff [ 32.131891] ? check_preemption_disabled+0x35/0x240 [ 32.136903] irq_exit+0x193/0x240 [ 32.140350] smp_apic_timer_interrupt+0x141/0x5e0 [ 32.145209] apic_timer_interrupt+0x93/0xa0 [ 32.149519] [ 32.151782] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 [ 32.157479] RSP: 0018:ffff8880a48379c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 32.165180] RAX: 1ffffffff11e1259 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.172440] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 [ 32.179728] RBP: ffffffff8c09e788 R08: ffffffff8b997ba8 R09: 0000000000000000 [ 32.187015] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808c000000 [ 32.194277] R13: 0000000000000000 R14: ffffffff8c09e788 R15: 0000000000000000 [ 32.201554] debug_check_no_obj_freed+0x2c0/0x680 [ 32.206424] ? free_transhuge_page+0x1e8/0x290 [ 32.211004] ? debug_object_activate+0x490/0x490 [ 32.215755] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 32.221200] __free_pages_ok+0x215/0xeb0 [ 32.225280] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 32.230378] ? free_transhuge_page+0x1e8/0x290 [ 32.234955] release_pages+0x779/0xbf0 [ 32.238841] ? __put_compound_page+0xb0/0xb0 [ 32.243241] ? free_pages_and_swap_cache+0x166/0x210 [ 32.248338] tlb_flush_mmu_free+0xc1/0x1a0 [ 32.252574] tlb_finish_mmu+0xf3/0x1e0 [ 32.256455] exit_mmap+0x290/0x4d0 [ 32.259987] ? SyS_remap_file_pages+0x6a0/0x6a0 [ 32.264653] ? kmem_cache_free+0x23a/0x2b0 [ 32.268886] ? __khugepaged_exit+0x29b/0x3c0 [ 32.273291] mmput+0xfa/0x420 [ 32.276413] do_exit+0x984/0x2850 [ 32.279864] ? __do_page_fault+0x571/0xad0 [ 32.284093] ? mm_update_next_owner+0x5b0/0x5b0 [ 32.288754] ? lock_downgrade+0x740/0x740 [ 32.292900] do_group_exit+0x100/0x2e0 [ 32.296783] SyS_exit_group+0x19/0x20 [ 32.300584] ? do_group_exit+0x2e0/0x2e0 [ 32.304642] do_syscall_64+0x1d5/0x640 [ 32.308527] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.313713] RIP: 0033:0x43e989 [ 32.316917] RSP: 002b:00007ffebcf06408 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.324617] RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043e989 [ 32.331878] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 32.339165] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 32.346456] R10: 0000000000000800 R11: 0000000000000246 R12: 00000000004b02f0 [ 32.353717] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 32.360981] [ 32.362596] The buggy address belongs to the page: [ 32.367515] page:ffffea0002e901c0 count:1 mapcount:0 mapping: (null) index:0x0 [ 32.375648] flags: 0xfff00000000800(reserved) [ 32.380159] raw: 00fff00000000800 0000000000000000 0000000000000000 00000001ffffffff [ 32.388035] raw: ffffea0002e901e0 ffffea0002e901e0 0000000000000000 0000000000000000 [ 32.395905] page dumped because: kasan: bad access detected [ 32.401601] [ 32.403248] Memory state around the buggy address: [ 32.408165] ffff8880ba407b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 32.415515] ffff8880ba407c00: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 [ 32.422864] >ffff8880ba407c80: f1 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 [ 32.430210] ^ [ 32.434892] ffff8880ba407d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 32.442265] ffff8880ba407d80: 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 f3 f3 [ 32.449639] ================================================================== [ 32.456985] Disabling lock debugging due to kernel taint [ 32.462546] Kernel panic - not syncing: panic_on_warn set ... [ 32.462546] [ 32.469907] CPU: 0 PID: 8609 Comm: syz-executor113 Tainted: G B 4.14.228-syzkaller #0 [ 32.478993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.488338] Call Trace: [ 32.490936] [ 32.493087] dump_stack+0x1b2/0x281 [ 32.496715] panic+0x1f9/0x42d [ 32.499901] ? add_taint.cold+0x16/0x16 [ 32.503895] ? lock_downgrade+0x740/0x740 [ 32.508040] kasan_end_report+0x43/0x49 [ 32.512021] kasan_report_error.cold+0xa7/0x191 [ 32.516695] ? unwind_next_frame+0x1360/0x17d0 [ 32.521274] __asan_report_load8_noabort+0x68/0x70 [ 32.526198] ? unwind_next_frame+0x1360/0x17d0 [ 32.530795] unwind_next_frame+0x1360/0x17d0 [ 32.535199] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.540570] ? deref_stack_reg+0x1a0/0x1a0 [ 32.544803] ? perf_output_copy+0x210/0x210 [ 32.549122] ? check_preemption_disabled+0x35/0x240 [ 32.554133] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.559494] perf_callchain_kernel+0x38c/0x520 [ 32.564075] ? arch_perf_update_userpage+0x300/0x300 [ 32.569194] ? check_preemption_disabled+0x35/0x240 [ 32.574230] ? kernel_text_address+0xbd/0xf0 [ 32.578631] ? check_preemption_disabled+0x35/0x240 [ 32.583643] get_perf_callchain+0x2de/0x740 [ 32.587962] ? put_callchain_buffers+0x60/0x60 [ 32.592540] ? perf_tp_event+0x3e0/0x6e0 [ 32.596596] perf_callchain+0x147/0x190 [ 32.600566] perf_prepare_sample+0xd77/0x1380 [ 32.605054] ? perf_event_output_forward+0x143/0x1f0 [ 32.610150] ? perf_output_sample+0x16f0/0x16f0 [ 32.614814] perf_event_output_forward+0xc9/0x1f0 [ 32.619650] ? perf_prepare_sample+0x1380/0x1380 [ 32.624397] ? __perf_event_overflow+0x1b6/0x310 [ 32.629150] ? check_preemption_disabled+0x35/0x240 [ 32.634191] __perf_event_overflow+0x113/0x310 [ 32.638768] perf_swevent_event+0x3c8/0x460 [ 32.643084] perf_tp_event+0x540/0x6e0 [ 32.646966] ? perf_swevent_event+0x460/0x460 [ 32.651454] ? perf_trace_run_bpf_submit+0x119/0x200 [ 32.656553] ? trace_hardirqs_on+0x10/0x10 [ 32.660811] ? HARDIRQ_verbose+0x10/0x10 [ 32.664866] ? __save_stack_trace+0x63/0x160 [ 32.669272] ? deref_stack_reg+0x124/0x1a0 [ 32.673502] ? is_bpf_text_address+0x91/0x150 [ 32.677992] ? lock_acquire+0x170/0x3f0 [ 32.681957] ? lock_downgrade+0x740/0x740 [ 32.686099] ? is_bpf_text_address+0xb8/0x150 [ 32.690611] ? kernel_text_address+0xbd/0xf0 [ 32.695012] ? perf_trace_run_bpf_submit+0x119/0x200 [ 32.700108] ? __kernel_text_address+0x9/0x30 [ 32.704598] ? unwind_get_return_address+0x51/0x90 [ 32.709523] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.714899] ? __save_stack_trace+0xa0/0x160 [ 32.719304] ? perf_trace_run_bpf_submit+0x119/0x200 [ 32.724407] ? check_preemption_disabled+0x35/0x240 [ 32.729419] perf_trace_run_bpf_submit+0x119/0x200 [ 32.734348] perf_trace_lock_acquire+0x332/0x510 [ 32.739108] ? apic_timer_interrupt+0x93/0xa0 [ 32.743627] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 32.748723] ? debug_check_no_obj_freed+0x2c0/0x680 [ 32.753734] ? HARDIRQ_verbose+0x10/0x10 [ 32.757791] ? SyS_exit_group+0x19/0x20 [ 32.761757] ? do_syscall_64+0x1d5/0x640 [ 32.765810] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.771168] lock_acquire+0x2b8/0x3f0 [ 32.774965] ? debug_object_active_state+0xe7/0x330 [ 32.779978] _raw_spin_lock_irqsave+0x8c/0xc0 [ 32.784471] ? debug_object_active_state+0xe7/0x330 [ 32.789484] debug_object_active_state+0xe7/0x330 [ 32.794322] ? debug_object_free+0x320/0x320 [ 32.798728] ? lock_downgrade+0x740/0x740 [ 32.802868] ? find_get_pid+0x200/0x200 [ 32.806837] rcu_process_callbacks+0x82d/0x1180 [ 32.811506] ? note_gp_changes+0x2f0/0x2f0 [ 32.815748] ? sched_clock+0x2a/0x40 [ 32.819460] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 32.824908] __do_softirq+0x24d/0x9ff [ 32.828704] ? check_preemption_disabled+0x35/0x240 [ 32.833716] irq_exit+0x193/0x240 [ 32.837160] smp_apic_timer_interrupt+0x141/0x5e0 [ 32.842007] apic_timer_interrupt+0x93/0xa0 [ 32.846319] [ 32.848639] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 [ 32.854377] RSP: 0018:ffff8880a48379c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 32.862074] RAX: 1ffffffff11e1259 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.869336] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 [ 32.876597] RBP: ffffffff8c09e788 R08: ffffffff8b997ba8 R09: 0000000000000000 [ 32.883858] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808c000000 [ 32.891122] R13: 0000000000000000 R14: ffffffff8c09e788 R15: 0000000000000000 [ 32.898399] debug_check_no_obj_freed+0x2c0/0x680 [ 32.903262] ? free_transhuge_page+0x1e8/0x290 [ 32.907952] ? debug_object_activate+0x490/0x490 [ 32.912704] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 32.918173] __free_pages_ok+0x215/0xeb0 [ 32.922243] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 32.927342] ? free_transhuge_page+0x1e8/0x290 [ 32.931918] release_pages+0x779/0xbf0 [ 32.935803] ? __put_compound_page+0xb0/0xb0 [ 32.940212] ? free_pages_and_swap_cache+0x166/0x210 [ 32.945312] tlb_flush_mmu_free+0xc1/0x1a0 [ 32.949539] tlb_finish_mmu+0xf3/0x1e0 [ 32.953437] exit_mmap+0x290/0x4d0 [ 32.956969] ? SyS_remap_file_pages+0x6a0/0x6a0 [ 32.961638] ? kmem_cache_free+0x23a/0x2b0 [ 32.965870] ? __khugepaged_exit+0x29b/0x3c0 [ 32.970275] mmput+0xfa/0x420 [ 32.973376] do_exit+0x984/0x2850 [ 32.976826] ? __do_page_fault+0x571/0xad0 [ 32.981056] ? mm_update_next_owner+0x5b0/0x5b0 [ 32.985718] ? lock_downgrade+0x740/0x740 [ 32.989862] do_group_exit+0x100/0x2e0 [ 32.993745] SyS_exit_group+0x19/0x20 [ 32.997541] ? do_group_exit+0x2e0/0x2e0 [ 33.001598] do_syscall_64+0x1d5/0x640 [ 33.005484] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 33.010668] RIP: 0033:0x43e989 [ 33.013854] RSP: 002b:00007ffebcf06408 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.021555] RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043e989 [ 33.028818] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 33.036081] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 33.043364] R10: 0000000000000800 R11: 0000000000000246 R12: 00000000004b02f0 [ 33.050622] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 33.058387] Kernel Offset: disabled [ 33.062000] Rebooting in 86400 seconds..