[ 73.893682][ T27] audit: type=1800 audit(1578547562.293:26): pid=9826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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. [ 74.850542][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 74.850554][ T27] audit: type=1800 audit(1578547563.273:29): pid=9826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 74.877387][ T27] audit: type=1800 audit(1578547563.273:30): pid=9826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.129' (ECDSA) to the list of known hosts. 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 syzkaller login: [ 86.694580][T10103] ------------[ cut here ]------------ [ 86.700125][T10103] ODEBUG: free active (active state 0) object type: work_struct hint: io_ring_file_ref_switch+0x0/0xac0 [ 86.711518][T10103] WARNING: CPU: 0 PID: 10103 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 86.721243][T10103] Kernel panic - not syncing: panic_on_warn set ... [ 86.727832][T10103] CPU: 0 PID: 10103 Comm: syz-executor179 Not tainted 5.5.0-rc5-next-20200108-syzkaller #0 [ 86.737788][T10103] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.747828][T10103] Call Trace: [ 86.751110][T10103] dump_stack+0x197/0x210 [ 86.755423][T10103] ? debug_print_object+0xe0/0x250 [ 86.760547][T10103] panic+0x2e3/0x75c [ 86.764451][T10103] ? add_taint.cold+0x16/0x16 [ 86.769118][T10103] ? __kasan_check_write+0x14/0x20 [ 86.774267][T10103] ? __warn.cold+0x14/0x3e [ 86.778677][T10103] ? __warn+0xd9/0x1cf [ 86.782729][T10103] ? debug_print_object+0x168/0x250 [ 86.787921][T10103] __warn.cold+0x2f/0x3e [ 86.792160][T10103] ? debug_print_object+0x168/0x250 [ 86.797354][T10103] report_bug+0x289/0x300 [ 86.801669][T10103] do_error_trap+0x11b/0x200 [ 86.806247][T10103] do_invalid_op+0x37/0x50 [ 86.810643][T10103] ? debug_print_object+0x168/0x250 [ 86.815823][T10103] invalid_op+0x23/0x30 [ 86.819982][T10103] RIP: 0010:debug_print_object+0x168/0x250 [ 86.825787][T10103] Code: dd 80 8b 91 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 80 8b 91 88 48 c7 c7 e0 80 91 88 e8 87 96 a2 fd <0f> 0b 83 05 43 e5 00 07 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 86.845398][T10103] RSP: 0018:ffffc90002457ae0 EFLAGS: 00010086 [ 86.851450][T10103] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 86.859404][T10103] RDX: 0000000000000000 RSI: ffffffff815e7896 RDI: fffff5200048af4e [ 86.867360][T10103] RBP: ffffc90002457b20 R08: ffff888094f22140 R09: ffffed1015d045c9 [ 86.875323][T10103] R10: ffffed1015d045c8 R11: ffff8880ae822e43 R12: 0000000000000001 [ 86.883343][T10103] R13: ffffffff89b7c540 R14: ffffffff814c5450 R15: ffff88809f6f2700 [ 86.891538][T10103] ? __exit_umh+0x2e0/0x2e0 [ 86.896062][T10103] ? vprintk_func+0x86/0x189 [ 86.900650][T10103] debug_check_no_obj_freed+0x2d4/0x43f [ 86.906367][T10103] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 86.911900][T10103] kfree+0xf8/0x2c0 [ 86.916239][T10103] io_sqe_files_unregister+0x1fb/0x2f0 [ 86.921717][T10103] io_ring_ctx_wait_and_kill+0x430/0x9a0 [ 86.927458][T10103] ? write_comp_data+0x30/0x70 [ 86.932229][T10103] io_uring_release+0x42/0x50 [ 86.936910][T10103] __fput+0x2ff/0x890 [ 86.940904][T10103] ? io_ring_ctx_wait_and_kill+0x9a0/0x9a0 [ 86.946722][T10103] ____fput+0x16/0x20 [ 86.950722][T10103] task_work_run+0x145/0x1c0 [ 86.955326][T10103] do_exit+0xbcb/0x2f70 [ 86.959474][T10103] ? mm_update_next_owner+0x7c0/0x7c0 [ 86.964831][T10103] ? up_read+0x1cd/0x810 [ 86.969075][T10103] ? down_read_non_owner+0x490/0x490 [ 86.974361][T10103] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 86.979808][T10103] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 86.985257][T10103] do_group_exit+0x135/0x360 [ 86.989856][T10103] __x64_sys_exit_group+0x44/0x50 [ 86.994884][T10103] do_syscall_64+0xfa/0x790 [ 86.999481][T10103] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 87.005374][T10103] RIP: 0033:0x43fef8 [ 87.009267][T10103] Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 [ 87.028857][T10103] RSP: 002b:00007ffd60e054d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 87.037348][T10103] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043fef8 [ 87.045320][T10103] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 87.053287][T10103] RBP: 00000000004bf790 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 87.061250][T10103] R10: 40000000000001b2 R11: 0000000000000246 R12: 0000000000000001 [ 87.069208][T10103] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 87.079214][T10103] Kernel Offset: disabled [ 87.083601][T10103] Rebooting in 86400 seconds..