================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x104/0x7280 kernel/locking/lockdep.c:5036 Read of size 8 at addr ffff0000d7ef4bb0 by task gfs2_quotad/4658 CPU: 1 PID: 4658 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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+0x104/0x7280 kernel/locking/lockdep.c:5036 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 __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 5726: 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_node+0xdc/0x184 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x88/0x1d4 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] bpf_check+0x178/0xe03c kernel/bpf/verifier.c:15526 bpf_prog_load+0xe2c/0x12c0 kernel/bpf/syscall.c:2651 __sys_bpf+0x494/0x660 kernel/bpf/syscall.c:5035 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline] __se_sys_bpf kernel/bpf/syscall.c:5137 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5137 __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+0x58/0x12c 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 Freed by task 5726: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x21c mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 kvfree+0x40/0x50 mm/util.c:627 bpf_check+0x8c68/0xe03c kernel/bpf/verifier.c:15747 bpf_prog_load+0xe2c/0x12c0 kernel/bpf/syscall.c:2651 __sys_bpf+0x494/0x660 kernel/bpf/syscall.c:5035 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline] __se_sys_bpf kernel/bpf/syscall.c:5137 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5137 __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+0x58/0x12c 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 ffff0000d7ef4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff0000d7ef4000, ffff0000d7ef6000) The buggy address belongs to the physical page: page:0000000021013a23 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117ef0 head:0000000021013a23 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc000365a400 dead000000000004 ffff0000c0002c00 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d7ef4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d7ef4b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d7ef4b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d7ef4c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d7ef4c80: 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: 1 PID: 4658 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 dump_stack+0x1c/0x5c lib/dump_stack.c:113 assign_lock_key+0x230/0x264 kernel/locking/lockdep.c:1004 register_lock_class+0x1ac/0x698 kernel/locking/lockdep.c:1317 __lock_acquire+0x258/0x7280 kernel/locking/lockdep.c:5048 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 __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 list_del corruption. prev->next should be ffff800022307d98, but was 0000000000000000. (prev=ffff0000d7ef4bd8) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4658 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 : ffff800022307c70 x29: ffff800022307c70 x28: 0000000000000000 x27: 0000000000000bb8 x26: 0000000000000bb8 x25: 0000000000001770 x24: ffff800022307d98 x23: dfff800000000000 x22: dfff800000000000 x21: ffff0000d7ef4bd8 x20: ffff0000d7ef4bd8 x19: ffff800022307d98 x18: 1fffe00033c1c97e x17: 20747562202c3839 x16: ffff800011bcac18 x15: 3038666666662065 x14: 0000000000000001 x13: 1fffe00033c1c9a3 x12: 0000000000000000 x11: ff008000083170c8 x10: 0000000000000000 x9 : 5d1758286024b900 x8 : 5d1758286024b900 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800022307738 x4 : ffff800016504f40 x3 : ffff800008542ee8 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:141 [inline] list_del_init include/linux/list.h:213 [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: 910f0000 aa1303e1 aa1503e3 95c59ee3 (d4210000) ---[ end trace 0000000000000000 ]---