[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.253' (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 syzkaller login: [ 28.318617] ================================================================== [ 28.326050] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x146f/0x17d0 [ 28.333385] Read of size 8 at addr ffff88809562fbe0 by task syz-executor421/8035 [ 28.340937] [ 28.342542] CPU: 0 PID: 8035 Comm: syz-executor421 Not tainted 4.14.212-syzkaller #0 [ 28.350394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.359721] Call Trace: [ 28.362332] dump_stack+0x1b2/0x283 [ 28.365952] print_address_description.cold+0x54/0x1d3 [ 28.371225] kasan_report_error.cold+0x8a/0x194 [ 28.375893] ? unwind_next_frame+0x146f/0x17d0 [ 28.380463] __asan_report_load8_noabort+0x68/0x70 [ 28.385376] ? unwind_next_frame+0x146f/0x17d0 [ 28.389934] unwind_next_frame+0x146f/0x17d0 [ 28.394320] ? retint_kernel+0x2d/0x2d [ 28.398181] ? deref_stack_reg+0x1a0/0x1a0 [ 28.402389] ? check_preemption_disabled+0x35/0x240 [ 28.407396] ? retint_kernel+0x2d/0x2d [ 28.411258] perf_callchain_kernel+0x38c/0x520 [ 28.415814] ? arch_perf_update_userpage+0x300/0x300 [ 28.420894] ? retint_kernel+0x2d/0x2d [ 28.424796] ? lock_downgrade+0x740/0x740 [ 28.428915] ? lock_downgrade+0x740/0x740 [ 28.433036] ? check_preemption_disabled+0x35/0x240 [ 28.438043] get_perf_callchain+0x2de/0x740 [ 28.442337] ? kernel_text_address+0xbd/0xf0 [ 28.446721] ? put_callchain_buffers+0x60/0x60 [ 28.451280] ? check_preemption_disabled+0x35/0x240 [ 28.456268] perf_callchain+0x147/0x190 [ 28.460217] perf_prepare_sample+0xd77/0x1380 [ 28.464697] ? get_perf_callchain+0x56e/0x740 [ 28.469253] ? perf_output_sample+0x16f0/0x16f0 [ 28.473906] perf_event_output_forward+0xc9/0x1f0 [ 28.478725] ? perf_prepare_sample+0x1380/0x1380 [ 28.483455] ? check_preemption_disabled+0x35/0x240 [ 28.488548] __perf_event_overflow+0x113/0x310 [ 28.493116] perf_swevent_event+0x3c8/0x460 [ 28.497411] perf_tp_event+0x540/0x6e0 [ 28.501271] ? perf_swevent_event+0x460/0x460 [ 28.505739] ? perf_swevent_event+0x3a2/0x460 [ 28.510207] ? tracing_generic_entry_update+0x162/0x1d0 [ 28.515543] ? perf_swevent_event+0xf8/0x460 [ 28.520188] ? perf_swevent_event+0x460/0x460 [ 28.524655] ? perf_tp_event+0x3e0/0x6e0 [ 28.528697] ? __lock_acquire+0x5fc/0x3f20 [ 28.532922] ? perf_trace_run_bpf_submit+0x119/0x200 [ 28.537998] perf_trace_run_bpf_submit+0x119/0x200 [ 28.542913] perf_trace_lock+0x2d6/0x490 [ 28.546954] ? perf_trace_lock_acquire+0x510/0x510 [ 28.551890] ? perf_trace_run_bpf_submit+0x119/0x200 [ 28.556971] ? check_preemption_disabled+0x35/0x240 [ 28.561962] ? retint_kernel+0x2d/0x2d [ 28.565827] ? debug_check_no_obj_freed+0x2c0/0x674 [ 28.570824] ? perf_trace_lock_acquire+0x510/0x510 [ 28.575726] lock_release+0x4df/0x870 [ 28.579517] ? lock_acquire+0x170/0x3f0 [ 28.583498] ? lock_downgrade+0x740/0x740 [ 28.587640] _raw_spin_unlock_irqrestore+0x1b/0xe0 [ 28.592548] debug_check_no_obj_freed+0x2c0/0x674 [ 28.597369] ? debug_object_activate+0x490/0x490 [ 28.602101] kmem_cache_free+0x156/0x2b0 [ 28.606136] __khugepaged_exit+0x29b/0x3c0 [ 28.610370] mmput+0x343/0x420 [ 28.613552] do_exit+0x984/0x2850 [ 28.616981] ? __do_page_fault+0x571/0xad0 [ 28.621188] ? mm_update_next_owner+0x5b0/0x5b0 [ 28.625828] ? lock_downgrade+0x740/0x740 [ 28.629950] do_group_exit+0x100/0x2e0 [ 28.633811] SyS_exit_group+0x19/0x20 [ 28.637594] ? do_group_exit+0x2e0/0x2e0 [ 28.641713] do_syscall_64+0x1d5/0x640 [ 28.645576] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.650832] RIP: 0033:0x43ff58 [ 28.654099] RSP: 002b:00007fff7f84d5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.661778] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff58 [ 28.669020] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.676263] RBP: 00000000004bf7f0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.683505] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 28.690762] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 28.698020] [ 28.699622] The buggy address belongs to the page: [ 28.704524] page:ffffea0002558bc0 count:0 mapcount:0 mapping: (null) index:0x0 [ 28.712767] flags: 0xfff00000000000() [ 28.716549] raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff [ 28.724532] raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 [ 28.732384] page dumped because: kasan: bad access detected [ 28.738066] [ 28.739667] Memory state around the buggy address: [ 28.744568] ffff88809562fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.751897] ffff88809562fb00: f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3 00 00 00 00 [ 28.759273] >ffff88809562fb80: 00 00 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 00 00 [ 28.766602] ^ [ 28.773071] ffff88809562fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.780400] ffff88809562fc80: 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3 00 00 00 [ 28.787772] ================================================================== [ 28.795123] Disabling lock debugging due to kernel taint [ 28.800544] Kernel panic - not syncing: panic_on_warn set ... [ 28.800544] [ 28.807879] CPU: 0 PID: 8035 Comm: syz-executor421 Tainted: G B 4.14.212-syzkaller #0 [ 28.816963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.826290] Call Trace: [ 28.828856] dump_stack+0x1b2/0x283 [ 28.832458] panic+0x1f9/0x42d [ 28.835624] ? add_taint.cold+0x16/0x16 [ 28.839573] ? lock_downgrade+0x740/0x740 [ 28.843696] kasan_end_report+0x43/0x49 [ 28.847643] kasan_report_error.cold+0xa7/0x194 [ 28.852285] ? unwind_next_frame+0x146f/0x17d0 [ 28.856838] __asan_report_load8_noabort+0x68/0x70 [ 28.861739] ? unwind_next_frame+0x146f/0x17d0 [ 28.866293] unwind_next_frame+0x146f/0x17d0 [ 28.870689] ? retint_kernel+0x2d/0x2d [ 28.874552] ? deref_stack_reg+0x1a0/0x1a0 [ 28.878762] ? check_preemption_disabled+0x35/0x240 [ 28.883754] ? retint_kernel+0x2d/0x2d [ 28.887619] perf_callchain_kernel+0x38c/0x520 [ 28.892176] ? arch_perf_update_userpage+0x300/0x300 [ 28.897373] ? retint_kernel+0x2d/0x2d [ 28.901238] ? lock_downgrade+0x740/0x740 [ 28.905366] ? lock_downgrade+0x740/0x740 [ 28.909490] ? check_preemption_disabled+0x35/0x240 [ 28.914483] get_perf_callchain+0x2de/0x740 [ 28.918779] ? kernel_text_address+0xbd/0xf0 [ 28.923159] ? put_callchain_buffers+0x60/0x60 [ 28.927715] ? check_preemption_disabled+0x35/0x240 [ 28.932707] perf_callchain+0x147/0x190 [ 28.936663] perf_prepare_sample+0xd77/0x1380 [ 28.941177] ? get_perf_callchain+0x56e/0x740 [ 28.945647] ? perf_output_sample+0x16f0/0x16f0 [ 28.950306] perf_event_output_forward+0xc9/0x1f0 [ 28.955129] ? perf_prepare_sample+0x1380/0x1380 [ 28.959868] ? check_preemption_disabled+0x35/0x240 [ 28.964862] __perf_event_overflow+0x113/0x310 [ 28.969427] perf_swevent_event+0x3c8/0x460 [ 28.973723] perf_tp_event+0x540/0x6e0 [ 28.977730] ? perf_swevent_event+0x460/0x460 [ 28.982233] ? perf_swevent_event+0x3a2/0x460 [ 28.986744] ? tracing_generic_entry_update+0x162/0x1d0 [ 28.992080] ? perf_swevent_event+0xf8/0x460 [ 28.996590] ? perf_swevent_event+0x460/0x460 [ 29.001167] ? perf_tp_event+0x3e0/0x6e0 [ 29.005212] ? __lock_acquire+0x5fc/0x3f20 [ 29.009432] ? perf_trace_run_bpf_submit+0x119/0x200 [ 29.014512] perf_trace_run_bpf_submit+0x119/0x200 [ 29.019420] perf_trace_lock+0x2d6/0x490 [ 29.023477] ? perf_trace_lock_acquire+0x510/0x510 [ 29.028403] ? perf_trace_run_bpf_submit+0x119/0x200 [ 29.033500] ? check_preemption_disabled+0x35/0x240 [ 29.038491] ? retint_kernel+0x2d/0x2d [ 29.042367] ? debug_check_no_obj_freed+0x2c0/0x674 [ 29.047357] ? perf_trace_lock_acquire+0x510/0x510 [ 29.052259] lock_release+0x4df/0x870 [ 29.056047] ? lock_acquire+0x170/0x3f0 [ 29.060048] ? lock_downgrade+0x740/0x740 [ 29.064176] _raw_spin_unlock_irqrestore+0x1b/0xe0 [ 29.069081] debug_check_no_obj_freed+0x2c0/0x674 [ 29.073900] ? debug_object_activate+0x490/0x490 [ 29.078683] kmem_cache_free+0x156/0x2b0 [ 29.082766] __khugepaged_exit+0x29b/0x3c0 [ 29.086978] mmput+0x343/0x420 [ 29.090146] do_exit+0x984/0x2850 [ 29.093577] ? __do_page_fault+0x571/0xad0 [ 29.097785] ? mm_update_next_owner+0x5b0/0x5b0 [ 29.102426] ? lock_downgrade+0x740/0x740 [ 29.106547] do_group_exit+0x100/0x2e0 [ 29.110408] SyS_exit_group+0x19/0x20 [ 29.114179] ? do_group_exit+0x2e0/0x2e0 [ 29.118212] do_syscall_64+0x1d5/0x640 [ 29.122089] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.127268] RIP: 0033:0x43ff58 [ 29.130435] RSP: 002b:00007fff7f84d5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.138117] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff58 [ 29.145377] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.152622] RBP: 00000000004bf7f0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.159863] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 29.167106] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 29.174992] Kernel Offset: disabled [ 29.178594] Rebooting in 86400 seconds..