================================================================== BUG: KASAN: use-after-free in __lock_acquire+0xf7/0x7c50 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff88805ef00bb0 by task gfs2_quotad/7464 CPU: 1 PID: 7464 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x22e 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+0xf7/0x7c50 kernel/locking/lockdep.c:4919 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162 finish_wait+0xb8/0x1d0 kernel/sched/wait.c:410 gfs2_quotad+0x4e6/0x670 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 7936: 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 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956 __do_krealloc mm/slab_common.c:1336 [inline] krealloc+0x6a/0x100 mm/slab_common.c:1369 copy_array kernel/bpf/verifier.c:955 [inline] copy_stack_state kernel/bpf/verifier.c:1009 [inline] copy_func_state kernel/bpf/verifier.c:1130 [inline] copy_verifier_state+0x67e/0xb10 kernel/bpf/verifier.c:1166 is_state_visited kernel/bpf/verifier.c:12340 [inline] do_check kernel/bpf/verifier.c:12455 [inline] do_check_common+0x42b6/0xc6a0 kernel/bpf/verifier.c:14937 do_check_main kernel/bpf/verifier.c:15000 [inline] bpf_check+0x3ee1/0x10ca0 kernel/bpf/verifier.c:15577 bpf_prog_load+0x1072/0x15a0 kernel/bpf/syscall.c:2651 __sys_bpf+0x520/0x6d0 kernel/bpf/syscall.c:5030 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 7936: 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 free_func_state kernel/bpf/verifier.c:1093 [inline] free_verifier_state+0xd0/0x220 kernel/bpf/verifier.c:1110 free_states kernel/bpf/verifier.c:14864 [inline] do_check_common+0xc002/0xc6a0 kernel/bpf/verifier.c:14949 do_check_main kernel/bpf/verifier.c:15000 [inline] bpf_check+0x3ee1/0x10ca0 kernel/bpf/verifier.c:15577 bpf_prog_load+0x1072/0x15a0 kernel/bpf/syscall.c:2651 __sys_bpf+0x520/0x6d0 kernel/bpf/syscall.c:5030 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88805ef00000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff88805ef00000, ffff88805ef02000) The buggy address belongs to the physical page: page:ffffea00017bc000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ef00 head:ffffea00017bc000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000a50c00 dead000000000002 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6491, tgid 6491 (syz-executor), ts 208708177221, free_ts 208648379005 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 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+0xbc6/0x1230 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 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa0/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x6c/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvmalloc_array include/linux/slab.h:734 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x35f/0x6a0 net/sched/sch_generic.c:870 qdisc_create_dflt+0x11a/0x4b0 net/sched/sch_generic.c:1019 mq_init+0x2df/0x660 net/sched/sch_mq.c:90 qdisc_create_dflt+0x11a/0x4b0 net/sched/sch_generic.c:1019 attach_default_qdiscs net/sched/sch_generic.c:1199 [inline] dev_activate+0x1cc/0x11a0 net/sched/sch_generic.c:1253 __dev_open+0x334/0x420 net/core/dev.c:1497 __dev_change_flags+0x20a/0x6a0 net/core/dev.c:8638 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383 zswap_entry_cache_alloc mm/zswap.c:289 [inline] zswap_frontswap_store+0x3f9/0x1680 mm/zswap.c:1170 __frontswap_store+0x2d9/0x5b0 mm/frontswap.c:186 frontswap_store include/linux/frontswap.h:66 [inline] swap_writepage+0xc8/0x1a0 mm/page_io.c:200 pageout mm/vmscan.c:1287 [inline] shrink_folio_list+0x2e7b/0x7ae0 mm/vmscan.c:1950 reclaim_folio_list+0x85/0x2e0 mm/vmscan.c:2695 reclaim_pages+0x561/0x670 mm/vmscan.c:2731 madvise_cold_or_pageout_pte_range+0x1bfd/0x1e50 mm/madvise.c:403 Memory state around the buggy address: ffff88805ef00a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805ef00b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805ef00b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805ef00c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805ef00c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================