================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x107/0x7bd0 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff888076d6cbb0 by task gfs2_quotad/6415 CPU: 1 PID: 6415 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x107/0x7bd0 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+0xbb/0x1c0 kernel/sched/wait.c:410 gfs2_quotad+0x501/0x690 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 6764: 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+0xb0/0x240 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x226/0x7d0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1303 [inline] netlink_dump+0x19f/0xcd0 net/netlink/af_netlink.c:2201 netlink_recvmsg+0x68f/0xe00 net/netlink/af_netlink.c:1959 ____sys_recvmsg+0x2c8/0x5b0 net/socket.c:-1 ___sys_recvmsg+0x210/0x590 net/socket.c:2780 do_recvmmsg+0x370/0x810 net/socket.c:2874 __sys_recvmmsg net/socket.c:2955 [inline] __do_sys_recvmmsg net/socket.c:2976 [inline] __se_sys_recvmmsg net/socket.c:2969 [inline] __x64_sys_recvmmsg+0x1b4/0x250 net/socket.c:2969 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 6764: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 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+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 skb_free_head net/core/skbuff.c:762 [inline] skb_release_data+0x5e9/0x7e0 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] consume_skb+0xa2/0x100 net/core/skbuff.c:1035 netlink_recvmsg+0x5e3/0xe00 net/netlink/af_netlink.c:1955 ____sys_recvmsg+0x2c8/0x5b0 net/socket.c:-1 ___sys_recvmsg+0x210/0x590 net/socket.c:2780 do_recvmmsg+0x370/0x810 net/socket.c:2874 __sys_recvmmsg net/socket.c:2955 [inline] __do_sys_recvmmsg net/socket.c:2976 [inline] __se_sys_recvmmsg net/socket.c:2969 [inline] __x64_sys_recvmmsg+0x1b4/0x250 net/socket.c:2969 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 ffff888076d6c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2992 bytes inside of 8192-byte region [ffff888076d6c000, ffff888076d6e000) The buggy address belongs to the physical page: page:ffffea0001db5a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76d68 head:ffffea0001db5a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001ed5800 dead000000000005 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 4257, tgid 4257 (kworker/1:3), ts 254815571244, free_ts 254730397381 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa3/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] snd_card_new+0x77/0x100 sound/core/init.c:176 snd_usb_audio_create+0x1b8/0x1470 sound/usb/card.c:627 usb_audio_probe+0x1711/0x1e70 sound/usb/card.c:838 usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:639 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:805 driver_probe_device+0x4f/0x420 drivers/base/dd.c:835 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:963 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x188/0x1e0 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/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3398 kmalloc_node_trace+0x22/0xe0 mm/slab_common.c:1039 kmalloc_node include/linux/slab.h:585 [inline] kzalloc_node include/linux/slab.h:710 [inline] __get_vm_area_node+0x122/0x330 mm/vmalloc.c:2506 __vmalloc_node_range+0x357/0x1380 mm/vmalloc.c:3203 __vmalloc_node mm/vmalloc.c:3308 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3381 alloc_counters+0xc8/0x720 net/ipv4/netfilter/ip_tables.c:801 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:823 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline] do_ipt_get_ctl+0xa8e/0x11a0 net/ipv4/netfilter/ip_tables.c:1667 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 Memory state around the buggy address: ffff888076d6ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076d6cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888076d6cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888076d6cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076d6cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================