[syzbot] WARNING: ODEBUG bug in nci_free_device

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    af7a05689189 Merge tag 'mips-fixes_6.1_1' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17f74649880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7abe2506fc0b8c90
dashboard link: https://syzkaller.appspot.com/bug?extid=c8ba0eb624e8efbb37a1
compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm

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+c8ba0eb624e8efbb37a1@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
WARNING: CPU: 1 PID: 10093 at lib/debugobjects.c:502 debug_print_object+0xb0/0xc4 lib/debugobjects.c:502
ODEBUG: free active (active state 0) object type: timer_list hint: nci_cmd_timer+0x0/0x2c net/nfc/nci/core.c:625
Modules linked in:
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 10093 Comm: syz-executor.1 Not tainted 6.1.0-rc4-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<8173b47c>] (dump_backtrace) from [<8173b570>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:253)
 r7:81cfb8d0 r6:822228ec r5:600a0093 r4:81d09cb8
[<8173b558>] (show_stack) from [<81757650>] (__dump_stack lib/dump_stack.c:88 [inline])
[<8173b558>] (show_stack) from [<81757650>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<81757608>] (dump_stack_lvl) from [<81757674>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82448d14
[<8175765c>] (dump_stack) from [<8173c118>] (panic+0x11c/0x360 kernel/panic.c:274)
[<8173bffc>] (panic) from [<80241604>] (__warn+0x98/0x1a4 kernel/panic.c:621)
 r3:00000001 r2:00000000 r1:00000000 r0:81cfb8d0
 r7:807a8834
[<8024156c>] (__warn) from [<8173c3f8>] (warn_slowpath_fmt+0x9c/0xd4 kernel/panic.c:651)
 r8:00000009 r7:807a8834 r6:000001f6 r5:81d53dac r4:81d53d6c
[<8173c360>] (warn_slowpath_fmt) from [<807a8834>] (debug_print_object+0xb0/0xc4 lib/debugobjects.c:502)
 r8:81804850 r7:81d20a24 r6:841589a8 r5:824cc2cc r4:8220cd94
[<807a8784>] (debug_print_object) from [<807a9f9c>] (__debug_check_no_obj_freed lib/debugobjects.c:989 [inline])
[<807a8784>] (debug_print_object) from [<807a9f9c>] (debug_check_no_obj_freed+0x1e8/0x230 lib/debugobjects.c:1020)
 r8:81804850 r7:00000122 r6:84f3e000 r5:84f3e030 r4:841589a8
[<807a9db4>] (debug_check_no_obj_freed) from [<80481b64>] (slab_free_hook mm/slub.c:1699 [inline])
[<807a9db4>] (debug_check_no_obj_freed) from [<80481b64>] (slab_free_freelist_hook mm/slub.c:1750 [inline])
[<807a9db4>] (debug_check_no_obj_freed) from [<80481b64>] (slab_free mm/slub.c:3661 [inline])
[<807a9db4>] (debug_check_no_obj_freed) from [<80481b64>] (__kmem_cache_free+0x16c/0x340 mm/slub.c:3674)
 r10:5ac3c35a r9:00000000 r8:84ef8490 r7:816ca63c r6:ddeab3e0 r5:84f3e000
 r4:82801600
[<804819f8>] (__kmem_cache_free) from [<80425fa8>] (kfree+0x6c/0x158 mm/slab_common.c:1007)
 r10:5ac3c35a r9:7efffd08 r8:84ef8490 r7:833d4450 r6:816ca63c r5:ddeab3e0
 r4:84f3e000
[<80425f3c>] (kfree) from [<816ca63c>] (nci_free_device+0x2c/0x30 net/nfc/nci/core.c:1205)
 r7:833d4450 r6:834eaf68 r5:000e001b r4:84f3e000
[<816ca610>] (nci_free_device) from [<809f1974>] (virtual_ncidev_close+0x6c/0x7c drivers/nfc/virtual_ncidev.c:167)
 r5:000e001b r4:824fd054
[<809f1908>] (virtual_ncidev_close) from [<804a9600>] (__fput+0x84/0x264 fs/file_table.c:320)
 r5:000e001b r4:84303900
[<804a957c>] (__fput) from [<804a985c>] (____fput+0x10/0x14 fs/file_table.c:348)
 r9:7efffd08 r8:83e56fc4 r7:824495dc r6:83e56780 r5:83e56f94 r4:00000000
[<804a984c>] (____fput) from [<8026618c>] (task_work_run+0x8c/0xb4 kernel/task_work.c:179)
[<80266100>] (task_work_run) from [<8020c070>] (resume_user_mode_work include/linux/resume_user_mode.h:49 [inline])
[<80266100>] (task_work_run) from [<8020c070>] (do_work_pending+0x420/0x524 arch/arm/kernel/signal.c:630)
 r9:7efffd08 r8:80200288 r7:fffffe30 r6:80200288 r5:e031dfb0 r4:83e56780
[<8020bc50>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x20)
Exception stack(0xe031dfb0 to 0xe031dff8)
dfa0:                                     00000000 00000002 00000000 00000003
dfc0: 00000004 015c14c0 00000000 00000006 00140000 000003e8 0014c048 00000000
dfe0: 2ec60000 7ec52408 0002993c 00029df8 80000010 00000003
 r10:00000006 r9:83e56780 r8:80200288 r7:00000006 r6:00000000 r5:015c14c0
 r4:00000004
Rebooting in 86400 seconds..


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