[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.511730] audit: type=1800 audit(1538998198.579:25): pid=5859 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.536302] audit: type=1800 audit(1538998198.579:26): pid=5859 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.556223] audit: type=1800 audit(1538998198.579:27): pid=5859 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.265107] ------------[ cut here ]------------ [ 45.269891] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 45.278764] WARNING: CPU: 0 PID: 6016 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 45.287503] Kernel panic - not syncing: panic_on_warn set ... [ 45.287503] [ 45.294897] CPU: 0 PID: 6016 Comm: syz-executor863 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 45.303450] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.312784] Call Trace: [ 45.315360] dump_stack+0x244/0x3ab [ 45.318973] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.324160] panic+0x238/0x4e7 [ 45.327346] ? add_taint.cold.5+0x16/0x16 [ 45.331492] ? __warn.cold.8+0x148/0x1ba [ 45.335535] ? __warn.cold.8+0x117/0x1ba [ 45.339596] ? debug_print_object+0x16a/0x210 [ 45.344075] __warn.cold.8+0x163/0x1ba [ 45.347946] ? debug_print_object+0x16a/0x210 [ 45.352425] report_bug+0x254/0x2d0 [ 45.356034] do_error_trap+0x11b/0x200 [ 45.359906] do_invalid_op+0x36/0x40 [ 45.363615] ? debug_print_object+0x16a/0x210 [ 45.368095] invalid_op+0x14/0x20 [ 45.371531] RIP: 0010:debug_print_object+0x16a/0x210 [ 45.376616] 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 [ 45.395500] RSP: 0018:ffff8801d7776da8 EFLAGS: 00010086 [ 45.400853] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 45.408129] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 45.415384] RBP: ffff8801d7776de8 R08: ffff8801d7f62380 R09: ffffed003b5c3eda [ 45.422637] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 45.429892] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 45.437156] ? vprintk_func+0x85/0x181 [ 45.441032] ? debug_print_object+0x16a/0x210 [ 45.445509] debug_check_no_obj_freed+0x3ae/0x58d [ 45.450336] ? debug_object_activate+0x600/0x600 [ 45.455175] ? trace_hardirqs_on+0x310/0x310 [ 45.459567] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 45.465263] kmem_cache_free+0x202/0x290 [ 45.469306] free_task+0x16e/0x1f0 [ 45.472826] ? arch_release_task_struct+0x10/0x10 [ 45.477670] ? atomic_notifier_call_chain+0xed/0x190 [ 45.482757] __put_task_struct+0x2e6/0x620 [ 45.486973] ? free_task+0x1f0/0x1f0 [ 45.490672] ? free_unref_page+0x960/0x960 [ 45.494885] ? __phys_addr+0xa6/0x120 [ 45.498690] finish_task_switch+0x66c/0x900 [ 45.503012] ? __switch_to_asm+0x40/0x70 [ 45.507063] ? preempt_notifier_register+0x200/0x200 [ 45.512149] ? __switch_to_asm+0x34/0x70 [ 45.516191] ? __switch_to_asm+0x34/0x70 [ 45.520234] ? __switch_to_asm+0x40/0x70 [ 45.524284] ? __switch_to_asm+0x34/0x70 [ 45.528327] ? __switch_to_asm+0x40/0x70 [ 45.532368] ? __switch_to_asm+0x34/0x70 [ 45.536413] ? __switch_to_asm+0x40/0x70 [ 45.540455] ? __switch_to_asm+0x34/0x70 [ 45.544497] ? __switch_to_asm+0x34/0x70 [ 45.548542] ? __switch_to_asm+0x40/0x70 [ 45.552586] ? __switch_to_asm+0x34/0x70 [ 45.556626] ? __switch_to_asm+0x40/0x70 [ 45.560674] ? __switch_to_asm+0x34/0x70 [ 45.564722] ? __switch_to_asm+0x40/0x70 [ 45.568771] __schedule+0x8d7/0x21d0 [ 45.572468] ? __sched_text_start+0x8/0x8 [ 45.576601] ? plist_check_head+0xea/0x150 [ 45.580817] ? plist_check_list+0xa0/0xa0 [ 45.584960] ? mark_held_locks+0x130/0x130 [ 45.589180] ? plist_add+0x601/0x7a0 [ 45.592877] ? lock_downgrade+0x900/0x900 [ 45.597004] ? plist_check_head+0x150/0x150 [ 45.601307] schedule+0xfe/0x460 [ 45.604664] ? lock_downgrade+0x900/0x900 [ 45.608789] ? __schedule+0x21d0/0x21d0 [ 45.612758] ? kasan_check_read+0x11/0x20 [ 45.616887] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.621280] ? do_raw_spin_trylock+0x270/0x270 [ 45.625854] ? lock_acquire+0x1ed/0x520 [ 45.629828] futex_wait_queue_me+0x3f9/0x840 [ 45.634219] ? refill_pi_state_cache.part.8+0x310/0x310 [ 45.639574] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.645098] ? get_futex_value_locked+0xcb/0xf0 [ 45.649747] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.654754] ? futex_wait_setup+0x266/0x3e0 [ 45.659068] ? lock_downgrade+0x900/0x900 [ 45.663207] ? futex_wake+0x760/0x760 [ 45.666988] ? dput.part.25+0x241/0x860 [ 45.670942] ? lock_downgrade+0x900/0x900 [ 45.675077] futex_wait+0x45c/0xa50 [ 45.678691] ? mntput_no_expire+0x1e6/0xc00 [ 45.682996] ? futex_wait_setup+0x3e0/0x3e0 [ 45.687314] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 45.692499] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 45.697602] ? futex_wake+0x304/0x760 [ 45.701405] ? is_bpf_text_address+0xac/0x170 [ 45.705883] ? lock_downgrade+0x900/0x900 [ 45.710018] do_futex+0x31a/0x26d0 [ 45.713896] ? kasan_check_read+0x11/0x20 [ 45.718029] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 45.723289] ? rcu_softirq_qs+0x20/0x20 [ 45.727244] ? unwind_dump+0x190/0x190 [ 45.731112] ? exit_robust_list+0x280/0x280 [ 45.735416] ? kernel_text_address+0x79/0xf0 [ 45.739805] ? __kernel_text_address+0xd/0x40 [ 45.744281] ? unwind_get_return_address+0x61/0xa0 [ 45.749193] ? __save_stack_trace+0x8d/0xf0 [ 45.753500] ? save_stack+0xa9/0xd0 [ 45.757112] ? save_stack+0x43/0xd0 [ 45.760720] ? __kasan_slab_free+0x102/0x150 [ 45.765108] ? kasan_slab_free+0xe/0x10 [ 45.769064] ? kmem_cache_free+0x83/0x290 [ 45.773192] ? putname+0xf2/0x130 [ 45.776634] ? do_sys_open+0x54d/0x700 [ 45.780511] ? __x64_sys_openat+0x9d/0x100 [ 45.784734] ? do_syscall_64+0x1b9/0x820 [ 45.788785] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.794136] ? trace_hardirqs_off+0xb8/0x310 [ 45.798524] ? kasan_check_read+0x11/0x20 [ 45.802655] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.807062] ? trace_hardirqs_on+0x310/0x310 [ 45.811473] ? trace_hardirqs_off+0xb8/0x310 [ 45.815868] ? trace_hardirqs_on+0x310/0x310 [ 45.820257] ? debug_check_no_obj_freed+0x305/0x58d [ 45.825256] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.830774] ? check_preemption_disabled+0x48/0x200 [ 45.835785] ? trace_hardirqs_on+0xbd/0x310 [ 45.840105] ? putname+0xf2/0x130 [ 45.843554] ? trace_hardirqs_off_caller+0x300/0x300 [ 45.848647] ? __kasan_slab_free+0x119/0x150 [ 45.853062] ? putname+0xf2/0x130 [ 45.856501] ? kmem_cache_free+0x21a/0x290 [ 45.860718] __x64_sys_futex+0x472/0x6a0 [ 45.864759] ? do_futex+0x26d0/0x26d0 [ 45.868539] ? trace_hardirqs_on+0xbd/0x310 [ 45.872842] ? __ia32_sys_read+0xb0/0xb0 [ 45.876904] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.882253] ? trace_hardirqs_off_caller+0x300/0x300 [ 45.887356] do_syscall_64+0x1b9/0x820 [ 45.891228] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.896572] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.901482] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.906305] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.911304] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.916300] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.921304] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.926151] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.931324] RIP: 0033:0x446549 [ 45.934513] 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 [ 45.953398] RSP: 002b:00007f0883214da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 45.961088] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446549 [ 45.968340] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 [ 45.975590] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 45.982847] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 45.990113] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd2c [ 45.998459] Kernel Offset: disabled [ 46.002088] Rebooting in 86400 seconds..