[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.824668] audit: type=1800 audit(1539003507.687:25): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.849514] audit: type=1800 audit(1539003507.687:26): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 34.874110] audit: type=1800 audit(1539003507.697:27): pid=5873 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 '10.128.10.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.834510] ------------[ cut here ]------------ [ 52.839423] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 52.848289] WARNING: CPU: 0 PID: 6030 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 52.857024] Kernel panic - not syncing: panic_on_warn set ... [ 52.857024] [ 52.864374] CPU: 0 PID: 6030 Comm: syz-executor494 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 52.873070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.882413] Call Trace: [ 52.884988] dump_stack+0x244/0x3ab [ 52.888720] ? dump_stack_print_info.cold.2+0x52/0x52 [ 52.893917] panic+0x238/0x4e7 [ 52.897113] ? add_taint.cold.5+0x16/0x16 [ 52.901279] ? __warn.cold.8+0x148/0x1ba [ 52.905439] ? __warn.cold.8+0x117/0x1ba [ 52.909499] ? debug_print_object+0x16a/0x210 [ 52.913985] __warn.cold.8+0x163/0x1ba [ 52.917863] ? debug_print_object+0x16a/0x210 [ 52.922351] report_bug+0x254/0x2d0 [ 52.926077] do_error_trap+0x11b/0x200 [ 52.929960] do_invalid_op+0x36/0x40 [ 52.933661] ? debug_print_object+0x16a/0x210 [ 52.938152] invalid_op+0x14/0x20 [ 52.941719] RIP: 0010:debug_print_object+0x16a/0x210 [ 52.946820] 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 [ 52.965714] RSP: 0018:ffff8801d5abeda8 EFLAGS: 00010086 [ 52.971072] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 52.978446] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 52.985704] RBP: ffff8801d5abede8 R08: ffff8801d7462380 R09: ffffed003b5c3eda [ 52.992967] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 53.000219] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 53.007494] ? vprintk_func+0x85/0x181 [ 53.011381] ? debug_print_object+0x16a/0x210 [ 53.015864] debug_check_no_obj_freed+0x3ae/0x58d [ 53.020694] ? debug_object_activate+0x600/0x600 [ 53.025563] ? trace_hardirqs_on+0x310/0x310 [ 53.029978] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 53.035803] kmem_cache_free+0x202/0x290 [ 53.039855] free_task+0x16e/0x1f0 [ 53.043383] ? arch_release_task_struct+0x10/0x10 [ 53.048285] ? atomic_notifier_call_chain+0xed/0x190 [ 53.053401] __put_task_struct+0x2e6/0x620 [ 53.057629] ? free_task+0x1f0/0x1f0 [ 53.061329] ? free_unref_page+0x960/0x960 [ 53.065550] ? __phys_addr+0xa6/0x120 [ 53.069348] finish_task_switch+0x66c/0x900 [ 53.073657] ? __switch_to_asm+0x40/0x70 [ 53.077704] ? preempt_notifier_register+0x200/0x200 [ 53.082888] ? __switch_to_asm+0x34/0x70 [ 53.087040] ? __switch_to_asm+0x34/0x70 [ 53.091088] ? __switch_to_asm+0x40/0x70 [ 53.095163] ? __switch_to_asm+0x34/0x70 [ 53.099229] ? __switch_to_asm+0x40/0x70 [ 53.103279] ? __switch_to_asm+0x34/0x70 [ 53.107329] ? __switch_to_asm+0x40/0x70 [ 53.111378] ? __switch_to_asm+0x34/0x70 [ 53.115427] ? __switch_to_asm+0x34/0x70 [ 53.119471] ? __switch_to_asm+0x40/0x70 [ 53.123523] ? __switch_to_asm+0x34/0x70 [ 53.127582] ? __switch_to_asm+0x40/0x70 [ 53.131745] ? __switch_to_asm+0x34/0x70 [ 53.135808] ? __switch_to_asm+0x40/0x70 [ 53.139856] __schedule+0x8d7/0x21d0 [ 53.143558] ? __sched_text_start+0x8/0x8 [ 53.147693] ? plist_check_head+0xea/0x150 [ 53.151911] ? plist_check_list+0xa0/0xa0 [ 53.156053] ? plist_add+0x601/0x7a0 [ 53.159756] ? __x2apic_send_IPI_dest+0x5c/0x80 [ 53.164410] ? plist_check_head+0x150/0x150 [ 53.168716] ? x2apic_send_IPI+0x6f/0x95 [ 53.172761] schedule+0xfe/0x460 [ 53.176120] ? lock_downgrade+0x900/0x900 [ 53.180250] ? __schedule+0x21d0/0x21d0 [ 53.184220] ? kasan_check_read+0x11/0x20 [ 53.188361] ? do_raw_spin_unlock+0xa7/0x2f0 [ 53.192768] ? do_raw_spin_trylock+0x270/0x270 [ 53.197347] ? lock_acquire+0x1ed/0x520 [ 53.201323] futex_wait_queue_me+0x3f9/0x840 [ 53.205726] ? refill_pi_state_cache.part.8+0x310/0x310 [ 53.211082] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 53.216184] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.221724] ? get_futex_value_locked+0xcb/0xf0 [ 53.226382] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 53.231445] ? futex_wait_setup+0x266/0x3e0 [ 53.235786] ? futex_wake+0x760/0x760 [ 53.239576] ? futex_wake+0x613/0x760 [ 53.243367] futex_wait+0x45c/0xa50 [ 53.246982] ? futex_wait_setup+0x3e0/0x3e0 [ 53.251287] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 53.256471] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 53.261575] ? futex_wake+0x304/0x760 [ 53.265375] ? kasan_check_write+0x14/0x20 [ 53.269606] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 53.274522] ? radix_tree_insert+0x870/0x870 [ 53.278911] ? wait_for_completion+0x8a0/0x8a0 [ 53.283475] do_futex+0x31a/0x26d0 [ 53.287001] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 53.291916] ? lock_downgrade+0x900/0x900 [ 53.296063] ? exit_robust_list+0x280/0x280 [ 53.300544] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.306086] ? ucma_put_ctx+0x39/0x60 [ 53.309880] ? ucma_resolve_ip+0x171/0x2a0 [ 53.314107] ? ucma_query+0xb20/0xb20 [ 53.317914] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.323457] ? _copy_from_user+0xdf/0x150 [ 53.327717] ? ucma_query+0xb20/0xb20 [ 53.331618] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.337164] ? ucma_write+0x12b/0x420 [ 53.340957] ? ucma_open+0x3f0/0x3f0 [ 53.344659] ? check_preemption_disabled+0x48/0x200 [ 53.349664] ? __vfs_write+0x121/0x9f0 [ 53.353545] ? ucma_open+0x3f0/0x3f0 [ 53.357256] ? kernel_read+0x120/0x120 [ 53.361149] ? apparmor_path_rmdir+0x30/0x30 [ 53.365546] ? get_unused_fd_flags+0x1a0/0x1a0 [ 53.370122] ? fsnotify_first_mark+0x350/0x350 [ 53.374690] ? apparmor_file_permission+0x24/0x30 [ 53.379520] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.385055] ? security_file_permission+0x1c2/0x220 [ 53.390063] ? rw_verify_area+0x118/0x360 [ 53.394201] __x64_sys_futex+0x472/0x6a0 [ 53.398363] ? do_futex+0x26d0/0x26d0 [ 53.402164] ? trace_hardirqs_on+0xbd/0x310 [ 53.406475] ? __ia32_sys_read+0xb0/0xb0 [ 53.410524] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.415871] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.420968] ? trace_hardirqs_off+0xb8/0x310 [ 53.425381] do_syscall_64+0x1b9/0x820 [ 53.429368] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 53.434809] ? syscall_return_slowpath+0x5e0/0x5e0 [ 53.439741] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.444754] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 53.449755] ? __bpf_trace_signal_deliver+0x40/0x40 [ 53.454757] ? __switch_to_asm+0x40/0x70 [ 53.458805] ? __switch_to_asm+0x34/0x70 [ 53.462960] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.467799] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.472979] RIP: 0033:0x446589 [ 53.476156] 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 [ 53.495046] RSP: 002b:00007fbe36ea6da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 53.502745] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446589 [ 53.509999] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc58 [ 53.517250] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 53.524501] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c [ 53.531753] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd4c [ 53.540463] Kernel Offset: disabled [ 53.544116] Rebooting in 86400 seconds..