[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 31.628747] audit: type=1800 audit(1539330635.716:25): pid=5841 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 31.672020] audit: type=1800 audit(1539330635.716:26): pid=5841 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 31.698222] audit: type=1800 audit(1539330635.716:27): pid=5841 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.434611] ------------[ cut here ]------------ [ 57.439401] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 57.448303] WARNING: CPU: 0 PID: 6001 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 57.457783] Kernel panic - not syncing: panic_on_warn set ... [ 57.457783] [ 57.465135] CPU: 0 PID: 6001 Comm: syz-executor995 Not tainted 4.19.0-rc7-next-20181011+ #92 [ 57.473694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.483160] Call Trace: [ 57.485753] dump_stack+0x244/0x3ab [ 57.489383] ? dump_stack_print_info.cold.2+0x52/0x52 [ 57.494574] panic+0x238/0x4e7 [ 57.497761] ? add_taint.cold.5+0x16/0x16 [ 57.501897] ? __warn.cold.8+0x148/0x1ba [ 57.505946] ? __warn.cold.8+0x117/0x1ba [ 57.509991] ? debug_print_object+0x16a/0x210 [ 57.514468] __warn.cold.8+0x163/0x1ba [ 57.518343] ? debug_print_object+0x16a/0x210 [ 57.522822] report_bug+0x254/0x2d0 [ 57.526439] do_error_trap+0x11b/0x200 [ 57.530309] do_invalid_op+0x36/0x40 [ 57.534004] ? debug_print_object+0x16a/0x210 [ 57.538485] invalid_op+0x14/0x20 [ 57.542056] RIP: 0010:debug_print_object+0x16a/0x210 [ 57.547152] Code: 41 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd a0 07 41 88 4c 89 fe 48 c7 c7 40 fd 40 88 e8 86 e2 b3 fd <0f> 0b 83 05 39 e1 5e 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f [ 57.566072] RSP: 0018:ffff8801bbc7eda8 EFLAGS: 00010086 [ 57.571424] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 57.578679] RDX: 0000000000000000 RSI: ffffffff8164bc15 RDI: 0000000000000005 [ 57.585932] RBP: ffff8801bbc7ede8 R08: ffff8801d79ce1c0 R09: ffffed003b5c3eda [ 57.593184] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 57.600439] R13: ffffffff8939a4e0 R14: 0000000000000000 R15: ffffffff884101e0 [ 57.607717] ? vprintk_func+0x85/0x181 [ 57.611607] ? debug_print_object+0x16a/0x210 [ 57.616089] debug_check_no_obj_freed+0x3ae/0x58d [ 57.620919] ? debug_object_activate+0x600/0x600 [ 57.625662] ? trace_hardirqs_on+0x310/0x310 [ 57.630055] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 57.635763] kmem_cache_free+0x202/0x290 [ 57.639813] free_task+0x16e/0x1f0 [ 57.643336] ? arch_release_task_struct+0x10/0x10 [ 57.648164] ? atomic_notifier_call_chain+0xed/0x190 [ 57.653264] __put_task_struct+0x2e6/0x620 [ 57.657484] ? free_task+0x1f0/0x1f0 [ 57.661196] ? free_unref_page+0x960/0x960 [ 57.665417] ? __phys_addr+0xa6/0x120 [ 57.669212] finish_task_switch+0x66c/0x900 [ 57.673541] ? __switch_to_asm+0x40/0x70 [ 57.677602] ? preempt_notifier_register+0x200/0x200 [ 57.682685] ? __switch_to_asm+0x34/0x70 [ 57.686734] ? __switch_to_asm+0x34/0x70 [ 57.690794] ? __switch_to_asm+0x40/0x70 [ 57.694835] ? __switch_to_asm+0x34/0x70 [ 57.698880] ? __switch_to_asm+0x40/0x70 [ 57.702924] ? __switch_to_asm+0x34/0x70 [ 57.706969] ? __switch_to_asm+0x40/0x70 [ 57.711011] ? __switch_to_asm+0x34/0x70 [ 57.715055] ? __switch_to_asm+0x34/0x70 [ 57.719098] ? __switch_to_asm+0x40/0x70 [ 57.723138] ? __switch_to_asm+0x34/0x70 [ 57.727178] ? __switch_to_asm+0x40/0x70 [ 57.731221] ? __switch_to_asm+0x34/0x70 [ 57.735446] ? __switch_to_asm+0x40/0x70 [ 57.739502] __schedule+0x8d7/0x21d0 [ 57.743206] ? __sched_text_start+0x8/0x8 [ 57.747340] ? plist_check_head+0xea/0x150 [ 57.751561] ? plist_check_list+0xa0/0xa0 [ 57.755691] ? __schedule+0x8d7/0x21d0 [ 57.759564] ? check_preempt_wakeup+0x6a8/0x1280 [ 57.764306] ? plist_add+0x601/0x7a0 [ 57.768007] ? plist_check_head+0x150/0x150 [ 57.772316] schedule+0xfe/0x460 [ 57.775681] ? lock_downgrade+0x900/0x900 [ 57.779817] ? __schedule+0x21d0/0x21d0 [ 57.783789] ? kasan_check_read+0x11/0x20 [ 57.787921] ? do_raw_spin_unlock+0xa7/0x2f0 [ 57.792311] ? do_raw_spin_trylock+0x270/0x270 [ 57.796886] ? lock_acquire+0x1ed/0x520 [ 57.800867] futex_wait_queue_me+0x3f9/0x840 [ 57.805266] ? refill_pi_state_cache.part.8+0x310/0x310 [ 57.810617] ? _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 57.815708] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.821232] ? get_futex_value_locked+0xcb/0xf0 [ 57.825885] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 57.830886] ? futex_wait_setup+0x266/0x3e0 [ 57.835193] ? futex_wake+0x760/0x760 [ 57.838979] ? futex_wake+0x613/0x760 [ 57.842783] futex_wait+0x45c/0xa50 [ 57.846408] ? futex_wait_setup+0x3e0/0x3e0 [ 57.850714] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 57.855891] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 57.860980] ? futex_wake+0x304/0x760 [ 57.864781] ? kasan_check_write+0x14/0x20 [ 57.869003] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 57.873918] ? radix_tree_insert+0x870/0x870 [ 57.878309] ? wait_for_completion+0x8a0/0x8a0 [ 57.882879] do_futex+0x31a/0x26d0 [ 57.886417] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 57.891333] ? lock_downgrade+0x900/0x900 [ 57.895477] ? exit_robust_list+0x280/0x280 [ 57.899803] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 57.905332] ? ucma_put_ctx+0x39/0x60 [ 57.909129] ? ucma_resolve_ip+0x171/0x2a0 [ 57.913349] ? ucma_query+0xb20/0xb20 [ 57.917140] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.922664] ? _copy_from_user+0xdf/0x150 [ 57.926797] ? ucma_query+0xb20/0xb20 [ 57.930593] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.936134] ? ucma_write+0x12b/0x420 [ 57.939925] ? ucma_open+0x3f0/0x3f0 [ 57.943632] ? __vfs_write+0x121/0x9f0 [ 57.947503] ? ucma_open+0x3f0/0x3f0 [ 57.951201] ? kernel_read+0x120/0x120 [ 57.955078] ? apparmor_path_rmdir+0x30/0x30 [ 57.959473] ? apparmor_file_permission+0x24/0x30 [ 57.964301] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.969830] ? security_file_permission+0x1c2/0x220 [ 57.974836] ? rw_verify_area+0x118/0x360 [ 57.978973] __x64_sys_futex+0x472/0x6a0 [ 57.983021] ? do_futex+0x26d0/0x26d0 [ 57.986805] ? trace_hardirqs_on+0xbd/0x310 [ 57.991136] ? __ia32_sys_read+0xb0/0xb0 [ 57.995194] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.000542] ? trace_hardirqs_off_caller+0x300/0x300 [ 58.005629] ? trace_hardirqs_off+0xb8/0x310 [ 58.010025] do_syscall_64+0x1b9/0x820 [ 58.013904] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 58.019250] ? syscall_return_slowpath+0x5e0/0x5e0 [ 58.024168] ? trace_hardirqs_on_caller+0x310/0x310 [ 58.029170] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 58.034172] ? post_copy_siginfo_from_user.isra.25.part.26+0x250/0x250 [ 58.040927] ? __switch_to_asm+0x40/0x70 [ 58.044972] ? __switch_to_asm+0x34/0x70 [ 58.049027] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.053859] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.059032] RIP: 0033:0x446669 [ 58.062212] 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 [ 58.081263] RSP: 002b:00007fd2de35bda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 58.088983] RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446669 [ 58.096261] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc68 [ 58.103517] RBP: 00000000006dbc60 R08: 0000000000000000 R09: 0000000000000000 [ 58.110775] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c [ 58.118025] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd4c [ 58.126143] Kernel Offset: disabled [ 58.129787] Rebooting in 86400 seconds..