[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.112249] audit: type=1800 audit(1539055866.691:25): pid=5862 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.137833] audit: type=1800 audit(1539055866.701:26): pid=5862 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.158411] audit: type=1800 audit(1539055866.701:27): pid=5862 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 '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.085519] ------------[ cut here ]------------ [ 46.090298] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 46.099156] WARNING: CPU: 0 PID: 6017 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 46.107914] Kernel panic - not syncing: panic_on_warn set ... [ 46.107914] [ 46.115287] CPU: 0 PID: 6017 Comm: syz-executor196 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 46.123843] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.133194] Call Trace: [ 46.135771] dump_stack+0x244/0x3ab [ 46.139380] ? dump_stack_print_info.cold.2+0x52/0x52 [ 46.144558] panic+0x238/0x4e7 [ 46.147736] ? add_taint.cold.5+0x16/0x16 [ 46.151868] ? __warn.cold.8+0x148/0x1ba [ 46.155909] ? __warn.cold.8+0x117/0x1ba [ 46.159954] ? debug_print_object+0x16a/0x210 [ 46.164433] __warn.cold.8+0x163/0x1ba [ 46.168307] ? debug_print_object+0x16a/0x210 [ 46.172789] report_bug+0x254/0x2d0 [ 46.176400] do_error_trap+0x11b/0x200 [ 46.180270] do_invalid_op+0x36/0x40 [ 46.183975] ? debug_print_object+0x16a/0x210 [ 46.188458] invalid_op+0x14/0x20 [ 46.191913] RIP: 0010:debug_print_object+0x16a/0x210 [ 46.197000] 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 [ 46.215889] RSP: 0018:ffff8801d77a6da8 EFLAGS: 00010086 [ 46.221239] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 46.228494] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 46.235746] RBP: ffff8801d77a6de8 R08: ffff8801d7846440 R09: ffffed003b5c3eda [ 46.242997] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 46.250251] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 46.257582] ? vprintk_func+0x85/0x181 [ 46.261467] ? debug_print_object+0x16a/0x210 [ 46.265955] debug_check_no_obj_freed+0x3ae/0x58d [ 46.270785] ? debug_object_activate+0x600/0x600 [ 46.275552] ? trace_hardirqs_on+0x310/0x310 [ 46.279996] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 46.285708] kmem_cache_free+0x202/0x290 [ 46.289762] free_task+0x16e/0x1f0 [ 46.293301] ? arch_release_task_struct+0x10/0x10 [ 46.298133] ? atomic_notifier_call_chain+0xed/0x190 [ 46.303231] __put_task_struct+0x2e6/0x620 [ 46.307538] ? free_task+0x1f0/0x1f0 [ 46.311249] ? free_unref_page+0x960/0x960 [ 46.315578] ? __phys_addr+0xa6/0x120 [ 46.319413] finish_task_switch+0x66c/0x900 [ 46.323722] ? __switch_to_asm+0x40/0x70 [ 46.327779] ? preempt_notifier_register+0x200/0x200 [ 46.332866] ? __switch_to_asm+0x34/0x70 [ 46.336918] ? __switch_to_asm+0x34/0x70 [ 46.340963] ? __switch_to_asm+0x40/0x70 [ 46.345007] ? __switch_to_asm+0x34/0x70 [ 46.349052] ? __switch_to_asm+0x40/0x70 [ 46.353095] ? __switch_to_asm+0x34/0x70 [ 46.357269] ? __switch_to_asm+0x40/0x70 [ 46.361324] ? __switch_to_asm+0x34/0x70 [ 46.365373] ? __switch_to_asm+0x34/0x70 [ 46.369418] ? __switch_to_asm+0x40/0x70 [ 46.373529] ? __switch_to_asm+0x34/0x70 [ 46.377581] ? __switch_to_asm+0x40/0x70 [ 46.381623] ? __switch_to_asm+0x34/0x70 [ 46.385667] ? __switch_to_asm+0x40/0x70 [ 46.389777] __schedule+0x8d7/0x21d0 [ 46.393481] ? __sched_text_start+0x8/0x8 [ 46.397612] ? plist_check_head+0xea/0x150 [ 46.401942] ? plist_check_list+0xa0/0xa0 [ 46.406079] ? plist_add+0x601/0x7a0 [ 46.409784] ? __x2apic_send_IPI_dest+0x5c/0x80 [ 46.414445] ? plist_check_head+0x150/0x150 [ 46.418750] ? x2apic_send_IPI+0x6f/0x95 [ 46.422836] schedule+0xfe/0x460 [ 46.426319] ? lock_downgrade+0x900/0x900 [ 46.430457] ? __schedule+0x21d0/0x21d0 [ 46.434419] ? kasan_check_read+0x11/0x20 [ 46.438555] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.442947] ? do_raw_spin_trylock+0x270/0x270 [ 46.447514] ? lock_acquire+0x1ed/0x520 [ 46.451478] futex_wait_queue_me+0x3f9/0x840 [ 46.455878] ? refill_pi_state_cache.part.8+0x310/0x310 [ 46.461233] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 46.466323] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.471853] ? get_futex_value_locked+0xcb/0xf0 [ 46.476509] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 46.481509] ? futex_wait_setup+0x266/0x3e0 [ 46.485820] ? futex_wake+0x760/0x760 [ 46.489613] ? futex_wake+0x613/0x760 [ 46.493406] futex_wait+0x45c/0xa50 [ 46.497020] ? futex_wait_setup+0x3e0/0x3e0 [ 46.501326] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 46.506503] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 46.511597] ? futex_wake+0x304/0x760 [ 46.515447] ? kasan_check_write+0x14/0x20 [ 46.519673] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 46.524594] ? radix_tree_insert+0x870/0x870 [ 46.528987] ? wait_for_completion+0x8a0/0x8a0 [ 46.533553] do_futex+0x31a/0x26d0 [ 46.537077] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 46.541991] ? lock_downgrade+0x900/0x900 [ 46.546125] ? exit_robust_list+0x280/0x280 [ 46.550482] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.556014] ? ucma_put_ctx+0x39/0x60 [ 46.559802] ? ucma_resolve_ip+0x171/0x2a0 [ 46.564020] ? ucma_query+0xb20/0xb20 [ 46.567807] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.573326] ? _copy_from_user+0xdf/0x150 [ 46.577523] ? ucma_query+0xb20/0xb20 [ 46.581323] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.586847] ? ucma_write+0x12b/0x420 [ 46.590637] ? ucma_open+0x3f0/0x3f0 [ 46.594341] ? check_preemption_disabled+0x48/0x200 [ 46.599348] ? __vfs_write+0x121/0x9f0 [ 46.603218] ? ucma_open+0x3f0/0x3f0 [ 46.606916] ? kernel_read+0x120/0x120 [ 46.610786] ? apparmor_path_rmdir+0x30/0x30 [ 46.615267] ? get_unused_fd_flags+0x1a0/0x1a0 [ 46.619852] ? fsnotify_first_mark+0x350/0x350 [ 46.624419] ? apparmor_file_permission+0x24/0x30 [ 46.629245] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.634765] ? security_file_permission+0x1c2/0x220 [ 46.639764] ? rw_verify_area+0x118/0x360 [ 46.643897] __x64_sys_futex+0x472/0x6a0 [ 46.647946] ? do_futex+0x26d0/0x26d0 [ 46.651732] ? trace_hardirqs_on+0xbd/0x310 [ 46.656038] ? __ia32_sys_read+0xb0/0xb0 [ 46.660081] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.665514] ? trace_hardirqs_off_caller+0x300/0x300 [ 46.670605] ? trace_hardirqs_off+0xb8/0x310 [ 46.675002] do_syscall_64+0x1b9/0x820 [ 46.678875] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 46.684298] ? syscall_return_slowpath+0x5e0/0x5e0 [ 46.689220] ? trace_hardirqs_on_caller+0x310/0x310 [ 46.694291] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 46.699304] ? __bpf_trace_signal_deliver+0x40/0x40 [ 46.704304] ? __switch_to_asm+0x40/0x70 [ 46.708346] ? __switch_to_asm+0x34/0x70 [ 46.712398] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.717230] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.722455] RIP: 0033:0x446589 [ 46.725642] 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 [ 46.744534] RSP: 002b:00007f1934209da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 46.752228] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446589 [ 46.759486] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc58 [ 46.766744] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 46.774039] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c [ 46.781301] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd4c [ 46.789630] Kernel Offset: disabled [ 46.793257] Rebooting in 86400 seconds..