------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: io_ring_file_ref_switch+0x0/0xac0 fs/io_uring.c:5651 WARNING: CPU: 1 PID: 10818 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 lib/debugobjects.c:481 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 10818 Comm: syz-executor.0 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:176 [inline] fixup_bug arch/x86/kernel/traps.c:171 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:269 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:288 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:481 Code: dd 00 d4 91 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 00 d4 91 88 48 c7 c7 60 c9 91 88 e8 57 9c a1 fd <0f> 0b 83 05 e3 13 01 07 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffffc90004937ba0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 00000000000143a3 RSI: ffffffff815eb7c6 RDI: fffff52000926f66 RBP: ffffc90004937be0 R08: ffff8880566d04c0 R09: ffffed1015d245c9 R10: ffffed1015d245c8 R11: ffff8880ae922e43 R12: 0000000000000001 R13: ffffffff89b7e460 R14: ffffffff814c81f0 R15: ffff88809790ec08 __debug_check_no_obj_freed lib/debugobjects.c:963 [inline] debug_check_no_obj_freed+0x2d4/0x43f lib/debugobjects.c:994 kfree+0xf8/0x2c0 mm/slab.c:3756 io_sqe_files_unregister+0x3b1/0x6c0 fs/io_uring.c:5095 __io_uring_register+0x389/0x2970 fs/io_uring.c:6606 __do_sys_io_uring_register fs/io_uring.c:6664 [inline] __se_sys_io_uring_register fs/io_uring.c:6646 [inline] __x64_sys_io_uring_register+0x1a1/0x570 fs/io_uring.c:6646 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa4c1427c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 00007fa4c14286d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000001fc R14: 00000000004d14b8 R15: 000000000075bf2c Kernel Offset: disabled Rebooting in 86400 seconds..