[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 70.204742][ T27] audit: type=1800 audit(1577569577.594:25): pid=9292 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 70.232826][ T27] audit: type=1800 audit(1577569577.594:26): pid=9292 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 70.284777][ T27] audit: type=1800 audit(1577569577.594:27): pid=9292 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 '10.128.0.124' (ECDSA) to the list of known hosts. syzkaller login: [ 82.903053][ T9444] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 104.712691][T10017] ------------[ cut here ]------------ [ 104.718252][T10017] ODEBUG: free active (active state 0) object type: work_struct hint: io_ring_file_ref_switch+0x0/0xac0 [ 104.729648][T10017] WARNING: CPU: 1 PID: 10017 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 104.739444][T10017] Kernel panic - not syncing: panic_on_warn set ... [ 104.746065][T10017] CPU: 1 PID: 10017 Comm: syz-executor148 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 104.756184][T10017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 104.766228][T10017] Call Trace: [ 104.769529][T10017] dump_stack+0x197/0x210 [ 104.773866][T10017] ? debug_print_object+0x110/0x250 [ 104.779055][T10017] panic+0x2e3/0x75c [ 104.782953][T10017] ? add_taint.cold+0x16/0x16 [ 104.788333][T10017] ? __kasan_check_write+0x14/0x20 [ 104.793459][T10017] ? __warn.cold+0x14/0x3e [ 104.797885][T10017] ? __warn+0xd9/0x1cf [ 104.801960][T10017] ? debug_print_object+0x168/0x250 [ 104.807163][T10017] __warn.cold+0x2f/0x3e [ 104.811537][T10017] ? debug_print_object+0x168/0x250 [ 104.816870][T10017] report_bug+0x289/0x300 [ 104.821220][T10017] do_error_trap+0x11b/0x200 [ 104.825964][T10017] do_invalid_op+0x37/0x50 [ 104.830389][T10017] ? debug_print_object+0x168/0x250 [ 104.835604][T10017] invalid_op+0x23/0x30 [ 104.839752][T10017] RIP: 0010:debug_print_object+0x168/0x250 [ 104.845556][T10017] Code: dd c0 24 70 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd c0 24 70 88 48 c7 c7 20 1a 70 88 e8 67 6c b1 fd <0f> 0b 83 05 53 2d ed 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 104.865415][T10017] RSP: 0018:ffffc9000331fc30 EFLAGS: 00010082 [ 104.871487][T10017] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 104.879813][T10017] RDX: 0000000000000000 RSI: ffffffff815e9f66 RDI: fffff52000663f78 [ 104.887775][T10017] RBP: ffffc9000331fc70 R08: ffff8880975da340 R09: ffffed1015d245c9 [ 104.895742][T10017] R10: ffffed1015d245c8 R11: ffff8880ae922e43 R12: 0000000000000001 [ 104.903710][T10017] R13: ffffffff8997da40 R14: ffffffff814c75d0 R15: ffff888216f92118 [ 104.911679][T10017] ? __exit_umh+0x2e0/0x2e0 [ 104.916308][T10017] ? vprintk_func+0x86/0x189 [ 104.920927][T10017] debug_check_no_obj_freed+0x2d4/0x43f [ 104.926479][T10017] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 104.932016][T10017] kfree+0xf8/0x2c0 [ 104.935824][T10017] io_sqe_files_unregister+0x1fb/0x2f0 [ 104.941283][T10017] io_ring_ctx_wait_and_kill+0x430/0x9a0 [ 104.946908][T10017] ? __sanitizer_cov_trace_const_cmp2+0x10/0x20 [ 104.953165][T10017] io_uring_release+0x42/0x50 [ 104.957837][T10017] __fput+0x2ff/0x890 [ 104.961823][T10017] ? io_ring_ctx_wait_and_kill+0x9a0/0x9a0 [ 104.967627][T10017] ____fput+0x16/0x20 [ 104.971597][T10017] task_work_run+0x145/0x1c0 [ 104.976213][T10017] exit_to_usermode_loop+0x316/0x380 [ 104.981552][T10017] do_syscall_64+0x676/0x790 [ 104.986137][T10017] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 104.992045][T10017] RIP: 0033:0x4035a0 [ 104.995933][T10017] Code: 01 f0 ff ff 0f 83 c0 0f 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d ad 07 2e 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0f 00 00 c3 48 83 ec 08 e8 fa 04 00 00 [ 105.015561][T10017] RSP: 002b:00007ffcba7e1fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 105.023968][T10017] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004035a0 [ 105.031939][T10017] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 [ 105.039911][T10017] RBP: 0000000000000000 R08: 00000000000003e8 R09: 00000000000003e8 [ 105.047887][T10017] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000008f [ 105.056029][T10017] R13: 0000000000000003 R14: 0000000000000004 R15: 00007ffcba7e2280 [ 105.065709][T10017] Kernel Offset: disabled [ 105.070278][T10017] Rebooting in 86400 seconds..