[ 35.394481] audit: type=1800 audit(1539016925.384:24): pid=5919 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.918583] audit: type=1800 audit(1539016925.974:25): pid=5919 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.952193] audit: type=1800 audit(1539016925.974:26): pid=5919 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.118' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.187056] ------------[ cut here ]------------ [ 50.191838] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 50.200684] WARNING: CPU: 0 PID: 6074 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 50.209459] Kernel panic - not syncing: panic_on_warn set ... [ 50.209459] [ 50.216815] CPU: 0 PID: 6074 Comm: syz-executor256 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 50.225371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.234815] Call Trace: [ 50.237442] dump_stack+0x244/0x3ab [ 50.241066] ? dump_stack_print_info.cold.2+0x52/0x52 [ 50.246246] panic+0x238/0x4e7 [ 50.249426] ? add_taint.cold.5+0x16/0x16 [ 50.253610] ? __warn.cold.8+0x148/0x1ba [ 50.257663] ? __warn.cold.8+0x117/0x1ba [ 50.261712] ? debug_print_object+0x16a/0x210 [ 50.266195] __warn.cold.8+0x163/0x1ba [ 50.270113] ? debug_print_object+0x16a/0x210 [ 50.274601] report_bug+0x254/0x2d0 [ 50.278212] do_error_trap+0x11b/0x200 [ 50.282088] do_invalid_op+0x36/0x40 [ 50.285921] ? debug_print_object+0x16a/0x210 [ 50.290410] invalid_op+0x14/0x20 [ 50.293866] RIP: 0010:debug_print_object+0x16a/0x210 [ 50.298959] Code: 41 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 60 02 41 88 4c 89 fe 48 c7 c7 00 f8 40 88 e8 36 2f b4 fd <0f> 0b 83 05 a9 f4 5e 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f [ 50.317858] RSP: 0018:ffff8801bbfe6da8 EFLAGS: 00010086 [ 50.323216] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 50.330467] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 50.337717] RBP: ffff8801bbfe6de8 R08: ffff8801d599e2c0 R09: ffffed003b5c3eda [ 50.344977] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 50.352229] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 50.359496] ? vprintk_func+0x85/0x181 [ 50.363370] ? debug_print_object+0x16a/0x210 [ 50.367870] debug_check_no_obj_freed+0x3ae/0x58d [ 50.372713] ? debug_object_activate+0x600/0x600 [ 50.377455] ? trace_hardirqs_on+0x310/0x310 [ 50.381886] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 50.387584] kmem_cache_free+0x202/0x290 [ 50.391629] free_task+0x16e/0x1f0 [ 50.395162] ? arch_release_task_struct+0x10/0x10 [ 50.400002] ? atomic_notifier_call_chain+0xed/0x190 [ 50.405094] __put_task_struct+0x2e6/0x620 [ 50.409315] ? free_task+0x1f0/0x1f0 [ 50.413019] ? free_unref_page+0x960/0x960 [ 50.417300] ? __phys_addr+0xa6/0x120 [ 50.421105] finish_task_switch+0x66c/0x900 [ 50.425415] ? __switch_to_asm+0x40/0x70 [ 50.429473] ? preempt_notifier_register+0x200/0x200 [ 50.434581] ? __switch_to_asm+0x34/0x70 [ 50.438630] ? __switch_to_asm+0x34/0x70 [ 50.442676] ? __switch_to_asm+0x40/0x70 [ 50.446718] ? __switch_to_asm+0x34/0x70 [ 50.450814] ? __switch_to_asm+0x40/0x70 [ 50.454872] ? __switch_to_asm+0x34/0x70 [ 50.458917] ? __switch_to_asm+0x40/0x70 [ 50.462962] ? __switch_to_asm+0x34/0x70 [ 50.467067] ? __switch_to_asm+0x34/0x70 [ 50.471170] ? __switch_to_asm+0x40/0x70 [ 50.475220] ? __switch_to_asm+0x34/0x70 [ 50.479272] ? __switch_to_asm+0x40/0x70 [ 50.483327] ? __switch_to_asm+0x34/0x70 [ 50.487373] ? __switch_to_asm+0x40/0x70 [ 50.491423] __schedule+0x8d7/0x21d0 [ 50.495122] ? __sched_text_start+0x8/0x8 [ 50.499256] ? plist_check_head+0xea/0x150 [ 50.503481] ? plist_check_list+0xa0/0xa0 [ 50.507613] ? mark_held_locks+0x130/0x130 [ 50.511883] ? plist_add+0x601/0x7a0 [ 50.515591] ? lock_downgrade+0x900/0x900 [ 50.519731] ? plist_check_head+0x150/0x150 [ 50.524040] schedule+0xfe/0x460 [ 50.527390] ? lock_downgrade+0x900/0x900 [ 50.531562] ? __schedule+0x21d0/0x21d0 [ 50.535524] ? kasan_check_read+0x11/0x20 [ 50.539654] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.544094] ? do_raw_spin_trylock+0x270/0x270 [ 50.548667] ? lock_acquire+0x1ed/0x520 [ 50.552642] futex_wait_queue_me+0x3f9/0x840 [ 50.557040] ? refill_pi_state_cache.part.8+0x310/0x310 [ 50.562398] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.567927] ? get_futex_value_locked+0xcb/0xf0 [ 50.572627] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.577638] ? futex_wait_setup+0x266/0x3e0 [ 50.581945] ? lock_downgrade+0x900/0x900 [ 50.586095] ? futex_wake+0x760/0x760 [ 50.589882] ? dput.part.25+0x241/0x860 [ 50.593847] ? lock_downgrade+0x900/0x900 [ 50.597985] futex_wait+0x45c/0xa50 [ 50.601601] ? mntput_no_expire+0x1e6/0xc00 [ 50.605912] ? futex_wait_setup+0x3e0/0x3e0 [ 50.610320] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 50.615500] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 50.620590] ? futex_wake+0x304/0x760 [ 50.624384] ? is_bpf_text_address+0xac/0x170 [ 50.628864] ? lock_downgrade+0x900/0x900 [ 50.633003] do_futex+0x31a/0x26d0 [ 50.636530] ? kasan_check_read+0x11/0x20 [ 50.640666] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 50.645927] ? rcu_softirq_qs+0x20/0x20 [ 50.649890] ? unwind_dump+0x190/0x190 [ 50.653760] ? exit_robust_list+0x280/0x280 [ 50.658070] ? kernel_text_address+0x79/0xf0 [ 50.662469] ? __kernel_text_address+0xd/0x40 [ 50.666952] ? unwind_get_return_address+0x61/0xa0 [ 50.671880] ? __save_stack_trace+0x8d/0xf0 [ 50.676194] ? save_stack+0xa9/0xd0 [ 50.679811] ? save_stack+0x43/0xd0 [ 50.683463] ? __kasan_slab_free+0x102/0x150 [ 50.687859] ? kasan_slab_free+0xe/0x10 [ 50.691831] ? kmem_cache_free+0x83/0x290 [ 50.695965] ? putname+0xf2/0x130 [ 50.699409] ? do_sys_open+0x54d/0x700 [ 50.703368] ? __x64_sys_openat+0x9d/0x100 [ 50.707596] ? do_syscall_64+0x1b9/0x820 [ 50.711645] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.717000] ? trace_hardirqs_off+0xb8/0x310 [ 50.721395] ? kasan_check_read+0x11/0x20 [ 50.725524] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.729992] ? trace_hardirqs_on+0x310/0x310 [ 50.734446] ? trace_hardirqs_off+0xb8/0x310 [ 50.738865] ? trace_hardirqs_on+0x310/0x310 [ 50.743309] ? debug_check_no_obj_freed+0x305/0x58d [ 50.748365] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.753901] ? check_preemption_disabled+0x48/0x200 [ 50.758903] ? trace_hardirqs_on+0xbd/0x310 [ 50.763212] ? putname+0xf2/0x130 [ 50.766650] ? trace_hardirqs_off_caller+0x300/0x300 [ 50.771743] ? __kasan_slab_free+0x119/0x150 [ 50.776141] ? putname+0xf2/0x130 [ 50.779579] ? kmem_cache_free+0x21a/0x290 [ 50.783803] __x64_sys_futex+0x472/0x6a0 [ 50.787852] ? do_futex+0x26d0/0x26d0 [ 50.791640] ? trace_hardirqs_on+0xbd/0x310 [ 50.795949] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.801301] ? trace_hardirqs_off_caller+0x300/0x300 [ 50.806441] do_syscall_64+0x1b9/0x820 [ 50.810324] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.815672] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.820587] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.825419] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.830427] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.835432] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.840432] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.845723] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.850895] RIP: 0033:0x446679 [ 50.854075] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 50.872960] RSP: 002b:00007f8878372da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 50.880661] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446679 [ 50.887927] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 [ 50.895194] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 50.902446] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 50.909699] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd4c [ 50.917940] Kernel Offset: disabled [ 50.921581] Rebooting in 86400 seconds..