================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6800 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff00011083cbb0 by task gfs2_quotad/7102 CPU: 1 PID: 7102 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 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 7485: 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] cryptomgr_schedule_probe crypto/algboss.c:85 [inline] cryptomgr_notify+0x164/0x8d4 crypto/algboss.c:238 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0xf0/0x198 kernel/notifier.c:382 crypto_probing_notify crypto/api.c:306 [inline] crypto_alg_mod_lookup+0x194/0x4fc crypto/api.c:336 crypto_find_alg+0xa0/0x114 crypto/api.c:588 crypto_grab_spawn+0x84/0x2e0 crypto/algapi.c:719 crypto_grab_cipher include/crypto/internal/cipher.h:190 [inline] skcipher_alloc_instance_simple+0x12c/0x538 crypto/skcipher.c:947 crypto_cbc_create+0x2c/0x190 crypto/cbc.c:180 cryptomgr_probe+0x70/0x168 crypto/algboss.c:61 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Freed by task 7485: 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/0x218 mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 cryptomgr_notify+0x5a4/0x8d4 crypto/algboss.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0xf0/0x198 kernel/notifier.c:382 crypto_probing_notify crypto/api.c:306 [inline] crypto_alg_mod_lookup+0x194/0x4fc crypto/api.c:336 crypto_find_alg+0xa0/0x114 crypto/api.c:588 crypto_grab_spawn+0x84/0x2e0 crypto/algapi.c:719 crypto_grab_cipher include/crypto/internal/cipher.h:190 [inline] skcipher_alloc_instance_simple+0x12c/0x538 crypto/skcipher.c:947 crypto_cbc_create+0x2c/0x190 crypto/cbc.c:180 cryptomgr_probe+0x70/0x168 crypto/algboss.c:61 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff00011083c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff00011083c000, ffff00011083e000) The buggy address belongs to the physical page: page:000000001d95f50a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x150838 head:000000001d95f50a order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc000442ec00 dead000000000002 ffff0000c0002c00 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00011083ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00011083cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00011083cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00011083cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00011083cc80: 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: 7102 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 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 ffff800021eb7d98, but was 0000000000000000. (prev=ffff00011083cbd8) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 7102 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 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 : ffff800021eb7c70 x29: ffff800021eb7c70 x28: 0000000000000000 x27: 0000000000000bb8 x26: 0000000000001770 x25: dfff800000000000 x24: dfff800000000000 x23: ffff00011083c7c0 x22: dfff800000000000 x21: ffff00011083cbd8 x20: ffff00011083cbd8 x19: ffff800021eb7d98 x18: ffff800011babf60 x17: 20747562202c3839 x16: ffff800011a529a8 x15: 0000000000000000 x14: 0000000000000001 x13: 1fffe00033ea39a3 x12: 0000000000ff0100 x11: ff008000083121f4 x10: 0000000000000000 x9 : c6b8628107e17d00 x8 : c6b8628107e17d00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021eb7738 x4 : ffff800015324ea0 x3 : ffff80000853974c 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: 911b0000 aa1303e1 aa1503e3 95c246f3 (d4210000) ---[ end trace 0000000000000000 ]---