==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6800 kernel/locking/lockdep.c:4919
Read of size 8 at addr ffff0000c3234bb0 by task gfs2_quotad/4443

CPU: 0 PID: 4443 Comm: gfs2_quotad Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 __lock_acquire+0x104/0x6800 kernel/locking/lockdep.c:4919
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 finish_wait+0xc8/0x1ac kernel/sched/wait.c:410
 gfs2_quotad+0x390/0x500 fs/gfs2/quota.c:1579
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Allocated by task 4908:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xec/0x178 mm/slab_common.c:949
 kmalloc_array include/linux/slab.h:615 [inline]
 kcalloc include/linux/slab.h:646 [inline]
 snd_seq_oss_readq_new+0x7c/0x218 sound/core/seq/oss/seq_oss_readq.c:41
 snd_seq_oss_open+0x660/0xc90 sound/core/seq/oss/seq_oss_init.c:231
 odev_open+0x84/0xbc sound/core/seq/oss/seq_oss.c:128
 soundcore_open+0x2f8/0x47c sound/sound_core.c:593
 chrdev_open+0x3d4/0x518 fs/char_dev.c:414
 do_dentry_open+0x72c/0xf98 fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1f8c/0x26bc fs/namei.c:3791
 do_filp_open+0x194/0x384 fs/namei.c:3818
 do_sys_openat2+0x134/0x3f4 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x118/0x14c fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000c3234000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2992 bytes inside of
 8192-byte region [ffff0000c3234000, ffff0000c3236000)

The buggy address belongs to the physical page:
page:0000000027c6cb59 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c3234000 pfn:0x103230
head:0000000027c6cb59 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc000331d400 dead000000000002 ffff0000c0002c00
raw: ffff0000c3234000 0000000080020001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c3234a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c3234b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c3234b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000c3234c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c3234c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 4443 Comm: gfs2_quotad Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 assign_lock_key+0x230/0x264 kernel/locking/lockdep.c:974
 register_lock_class+0x1ac/0x694 kernel/locking/lockdep.c:1287
 __lock_acquire+0x164/0x6800 kernel/locking/lockdep.c:4928
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 finish_wait+0xc8/0x1ac kernel/sched/wait.c:410
 gfs2_quotad+0x390/0x500 fs/gfs2/quota.c:1579
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
list_del corruption. prev->next should be ffff800021167d98, but was 0000000000000000. (prev=ffff0000c3234bd8)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4443 Comm: gfs2_quotad Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __list_del_entry_valid+0x13c/0x158 lib/list_debug.c:59
lr : __list_del_entry_valid+0x13c/0x158 lib/list_debug.c:59
sp : ffff800021167c70
x29: ffff800021167c70 x28: 0000000000000000 x27: 0000000000000bb8
x26: 0000000000001770 x25: dfff800000000000 x24: dfff800000000000
x23: ffff0000c32347c0 x22: dfff800000000000 x21: ffff0000c3234bd8
x20: ffff0000c3234bd8
 x19: ffff800021167d98
 x18: ffff800011b7bf60

x17: 20747562202c3839
 x16: ffff8000082ef028
 x15: 0000000000000000

x14: 0000000000000001
 x13: 1fffe00033eaaba3
 x12: 0000000000ff0100

x11: ff00800008311710
 x10: 0000000000000000
 x9 : d5670e3b029e3000

x8 : d5670e3b029e3000
 x7 : 0000000000000001
 x6 : 0000000000000001

x5 : ffff800021167738
 x4 : ffff8000152e4cc0
 x3 : ffff800008538160
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 000000000000006d
Call trace:
 __list_del_entry_valid+0x13c/0x158 lib/list_debug.c:59
 __list_del_entry include/linux/list.h:134 [inline]
 list_del_init include/linux/list.h:206 [inline]
 finish_wait+0xd4/0x1ac kernel/sched/wait.c:411
 gfs2_quotad+0x390/0x500 fs/gfs2/quota.c:1579
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 91250000 aa1303e1 aa1503e3 95c1a426 (d4210000) 
---[ end trace 0000000000000000 ]---