================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x106/0x7d10 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff88803019cbb0 by task gfs2_quotad/5115 CPU: 1 PID: 5115 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __lock_acquire+0x106/0x7d10 kernel/locking/lockdep.c:4919 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 finish_wait+0xb8/0x1d0 kernel/sched/wait.c:410 gfs2_quotad+0x4f3/0x680 fs/gfs2/quota.c:1579 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 5353: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] audit_log_d_path+0xc0/0x260 kernel/audit.c:2151 audit_log_d_path_exe+0x3e/0x70 kernel/audit.c:2222 audit_log_task+0x219/0x2e0 kernel/auditsc.c:2948 audit_seccomp+0x81/0x180 kernel/auditsc.c:2995 seccomp_log kernel/seccomp.c:994 [inline] __seccomp_filter+0xad3/0x1bf0 kernel/seccomp.c:1278 syscall_trace_enter+0xa7/0x150 kernel/entry/common.c:72 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 5353: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700 audit_log_d_path_exe+0x3e/0x70 kernel/audit.c:2222 audit_log_task+0x219/0x2e0 kernel/auditsc.c:2948 audit_seccomp+0x81/0x180 kernel/auditsc.c:2995 seccomp_log kernel/seccomp.c:994 [inline] __seccomp_filter+0xad3/0x1bf0 kernel/seccomp.c:1278 syscall_trace_enter+0xa7/0x150 kernel/entry/common.c:72 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88803019c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff88803019c000, ffff88803019e000) The buggy address belongs to the physical page: page:ffffea0000c06600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x30198 head:ffffea0000c06600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00014bbc00 dead000000000003 ffff888017442280 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 25340069696, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kmalloc_array include/linux/slab.h:614 [inline] kcalloc include/linux/slab.h:646 [inline] ovs_vport_init+0x42/0x60 net/openvswitch/vport.c:37 dp_init+0x6f/0x13e net/openvswitch/datapath.c:2705 do_one_initcall+0x26a/0x840 init/main.c:1310 do_initcall_level+0x137/0x1e4 init/main.c:1383 do_initcalls+0x4b/0x8a init/main.c:1399 kernel_init_freeable+0x415/0x5be init/main.c:1638 kernel_init+0x19/0x1b0 init/main.c:1526 page_owner free stack trace missing Memory state around the buggy address: ffff88803019ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803019cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803019cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803019cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803019cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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