==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933
Read of size 8 at addr ffff0000c3564bb0 by task gfs2_quotad/5211

CPU: 0 PID: 5211 Comm: gfs2_quotad Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0x104/0x6634 kernel/locking/lockdep.c:4933
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 __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+0x3c4/0x520 fs/gfs2/quota.c:1579
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Allocated by task 5859:
 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]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 init_sbd fs/gfs2/ops_fstype.c:77 [inline]
 gfs2_fill_super+0x10c/0x19e0 fs/gfs2/ops_fstype.c:1148
 get_tree_bdev+0x35c/0x54c fs/super.c:1377
 gfs2_get_tree+0x58/0x1b8 fs/gfs2/ops_fstype.c:1327
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 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 ffff0000c3564000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2992 bytes inside of
 8192-byte region [ffff0000c3564000, ffff0000c3566000)

The buggy address belongs to the physical page:
page:00000000857d4134 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c3564000 pfn:0x103560
head:00000000857d4134 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc0003516608 fffffc0003728808 ffff0000c0002c00
raw: ffff0000c3564000 0000000000020001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c3564a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c3564b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c3564b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000c3564c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c3564c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
list_del corruption. prev->next should be ffff8000211c7d98, but was ffff0000c3564bd8. (prev=ffff0000c3564bd8)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5211 Comm: gfs2_quotad Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __list_del_entry_valid+0x140/0x15c lib/list_debug.c:59
lr : __list_del_entry_valid+0x140/0x15c lib/list_debug.c:59
sp : ffff8000211c7c70
x29: ffff8000211c7c70 x28: 0000000000000000 x27: 0000000000000bb8
x26: 0000000000000bb8 x25: 0000000000001770 x24: ffff8000211c7d98
x23: dfff800000000000 x22: dfff800000000000 x21: ffff0000c3564bd8
x20: ffff0000c3564bd8 x19: ffff8000211c7d98 x18: 0000000000000000
x17: 20747562202c3839 x16: ffff800011b4ad90 x15: 3038666666662065
x14: 0000000000000001 x13: 1fffe00033e7dba3 x12: 0000000000000000
x11: ff00800008315498 x10: 0000000000000000 x9 : 7ec72a49dc3c5600
x8 : 7ec72a49dc3c5600 x7 : fffffffffffcd390 x6 : fffffffffffcd368
x5 : ffff8000211c7738 x4 : ffff8000153f9c50 x3 : ffff800008540dd8
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 000000000000006d
Call trace:
 __list_del_entry_valid+0x140/0x15c 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+0x3c4/0x520 fs/gfs2/quota.c:1579
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 913b0000 aa1303e1 aa1503e3 95c5000a (d4210000) 
---[ end trace 0000000000000000 ]---