BUG: unable to handle kernel paging request in debug_check_no_obj_freed

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 255b58a2 Linux 4.19.176
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=112d467ad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b270830ae46c1d6f
dashboard link: https://syzkaller.appspot.com/bug?extid=d5211fcf398fec4b6d3f

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d5211f...@syzkaller.appspotmail.com

A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
BUG: unable to handle kernel paging request at ffffdc0000000000
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9757 Comm: systemd-udevd Not tainted 4.19.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1c9/0x490 lib/debugobjects.c:817
Code: 48 b8 00 01 00 00 00 00 ad de 4d 89 60 08 4c 89 c7 49 89 00 e8 a8 d6 ff ff 09 c3 4d 85 f6 74 2c 4d 89 f0 4c 89 c0 48 c1 e8 03 <42> 80 3c 38 00 0f 84 23 ff ff ff 4c 89 c7 4c 89 44 24 38 e8 bf 46
RSP: 0018:ffff88822c09fda0 EFLAGS: 00010806
RAX: 1fffe00000000000 RBX: 0000000000000000 RCX: ffffffff814bc41b
RDX: 1ffffffff1a75bcb RSI: 0000000000000004 RDI: ffff888000194a28
RBP: 0000000000000016 R08: ffff000000000000 R09: ffff888049809970
R10: ffffffff8d3ade4b R11: 0000000000000000 R12: dead000000000200
R13: ffff8880a6bcb600 R14: ffff000000000000 R15: dffffc0000000000
FS: 00007f12426088c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 000000003ccab000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kmem_cache_free+0xff/0x260 mm/slab.c:3764
__put_cred+0x1de/0x250 kernel/cred.c:151
put_cred include/linux/cred.h:276 [inline]
do_faccessat+0x64e/0x7a0 fs/open.c:438
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f124147b9c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcc2e6c9c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00005577725496d0 RCX: 00007f124147b9c7
RDX: 00746e657665752f RSI: 0000000000000000 RDI: 00007ffcc2e6c9d0
RBP: 00007ffcc2e6ca40 R08: 0000000000000000 R09: 0000000000001010
R10: 0000000000000020 R11: 0000000000000246 R12: 0000557770789856
R13: 0000557772550560 R14: 00007ffcc2e6c9d0 R15: 000055777254e3f8
Modules linked in:
CR2: ffffdc0000000000
---[ end trace 5d5c1cbb626d091e ]---
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1c9/0x490 lib/debugobjects.c:817
Code: 48 b8 00 01 00 00 00 00 ad de 4d 89 60 08 4c 89 c7 49 89 00 e8 a8 d6 ff ff 09 c3 4d 85 f6 74 2c 4d 89 f0 4c 89 c0 48 c1 e8 03 <42> 80 3c 38 00 0f 84 23 ff ff ff 4c 89 c7 4c 89 44 24 38 e8 bf 46
RSP: 0018:ffff88822c09fda0 EFLAGS: 00010806
RAX: 1fffe00000000000 RBX: 0000000000000000 RCX: ffffffff814bc41b
RDX: 1ffffffff1a75bcb RSI: 0000000000000004 RDI: ffff888000194a28
RBP: 0000000000000016 R08: ffff000000000000 R09: ffff888049809970
R10: ffffffff8d3ade4b R11: 0000000000000000 R12: dead000000000200
R13: ffff8880a6bcb600 R14: ffff000000000000 R15: dffffc0000000000
FS: 00007f12426088c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 000000003ccab000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.