================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6800 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000cc8ecbb0 by task gfs2_quotad/4993 CPU: 1 PID: 4993 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 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 5605: 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_track_caller+0xe0/0x16c mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x264/0x714 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1303 [inline] netlink_dump+0x160/0xb18 net/netlink/af_netlink.c:2196 netlink_recvmsg+0x504/0xae0 net/netlink/af_netlink.c:1954 sock_recvmsg_nosec net/socket.c:1022 [inline] ____sys_recvmsg+0x678/0x768 net/socket.c:2735 ___sys_recvmsg net/socket.c:2779 [inline] do_recvmmsg+0x388/0xa0c net/socket.c:2873 __sys_recvmmsg net/socket.c:2954 [inline] __do_sys_recvmmsg net/socket.c:2975 [inline] __se_sys_recvmmsg net/socket.c:2968 [inline] __arm64_sys_recvmmsg+0x19c/0x23c net/socket.c:2968 __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 ffff0000cc8ec000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff0000cc8ec000, ffff0000cc8ee000) The buggy address belongs to the physical page: page:000000005f13c0f9 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000cc8ec000 pfn:0x10c8e8 head:000000005f13c0f9 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00034faa08 fffffc000330c608 ffff0000c0002c00 raw: ffff0000cc8ec000 0000000000020001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cc8eca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cc8ecb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000cc8ecb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cc8ecc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cc8ecc80: 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: 4993 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 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 ffff800021c87d98, but was 0000000000000000. (prev=ffff0000cc8ecbd8) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4993 Comm: gfs2_quotad Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 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 : ffff800021c87c70 x29: ffff800021c87c70 x28: 0000000000000000 x27: 0000000000000bb8 x26: 0000000000001770 x25: dfff800000000000 x24: dfff800000000000 x23: ffff0000cc8ec7c0 x22: dfff800000000000 x21: ffff0000cc8ecbd8 x20: ffff0000cc8ecbd8 x19: ffff800021c87d98 x18: ffff800011b9bf60 x17: 20747562202c3839 x16: ffff8000082eef80 x15: 0000000000000000 x14: 0000000000000001 x13: 1fffe00033eaa5a3 x12: 0000000000ff0100 x11: ff00800008311668 x10: 0000000000000000 x9 : 9145dabac0083800 x8 : 9145dabac0083800 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021c87738 x4 : ffff800015304cc0 x3 : ffff800008538848 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: 91300000 aa1303e1 aa1503e3 95c1ea98 (d4210000) ---[ end trace 0000000000000000 ]---