==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1b1/0x1d0 lib/list_debug.c:62
Read of size 8 at addr ffff88807f0a64c0 by task kworker/1:7/5767

CPU: 1 UID: 0 PID: 5767 Comm: kworker/1:7 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: events gfs2_withdraw_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1b1/0x1d0 lib/list_debug.c:62
 __list_del_entry_valid include/linux/list.h:140 [inline]
 __list_del_entry include/linux/list.h:261 [inline]
 list_del_init include/linux/list.h:333 [inline]
 gfs2_remove_from_ail+0x138/0x340 fs/gfs2/log.c:79
 gfs2_ail_empty_tr fs/gfs2/log.c:287 [inline]
 gfs2_ail_drain+0x39c/0x6b0 fs/gfs2/log.c:954
 do_withdraw+0xeb/0x300 fs/gfs2/util.c:126
 gfs2_withdraw_func+0x349/0x3d0 fs/gfs2/util.c:236
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 10057:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:351 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa17/0xfd0 fs/gfs2/ops_fstype.c:497
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
 do_mount fs/namespace.c:4350 [inline]
 __do_sys_mount fs/namespace.c:4566 [inline]
 __se_sys_mount fs/namespace.c:4543 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4543
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:264 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6509 [inline]
 kmem_cache_free+0x127/0x6c0 mm/slub.c:6636
 gfs2_glock_dealloc+0xd0/0x160 fs/gfs2/glock.c:134
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x5f0/0x1260 kernel/rcu/tree.c:2919
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 run_ksoftirqd kernel/softirq.c:1099 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1091
 smpboot_thread_fn+0x3d3/0xab0 kernel/smpboot.c:160
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 __call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3181
 gfs2_glock_free+0x35/0xa0 fs/gfs2/glock.c:150
 glock_work_func+0x437/0x4d0 fs/gfs2/glock.c:1003
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Second to last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 insert_work+0x36/0x230 kernel/workqueue.c:2272
 __queue_work+0xa60/0x1370 kernel/workqueue.c:2448
 __queue_delayed_work+0x357/0x450 kernel/workqueue.c:2617
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2669
 queue_delayed_work include/linux/workqueue.h:715 [inline]
 gfs2_glock_queue_work+0x75/0x120 fs/gfs2/glock.c:198
 do_xmote+0x453/0x680 fs/gfs2/glock.c:718
 run_queue+0x555/0x6a0 fs/gfs2/glock.c:757
 glock_work_func+0x35b/0x4d0 fs/gfs2/glock.c:987
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88807f0a63a8
 which belongs to the cache gfs2_glock(aspace) of size 1176
The buggy address is located 280 bytes inside of
 freed 1176-byte region [ffff88807f0a63a8, ffff88807f0a6840)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f0a4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
raw: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
head: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6706, tgid 6705 (syz.5.287), ts 164153393846
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab mm/slub.c:3462 [inline]
 new_slab+0xa9/0x6e0 mm/slub.c:3513
 refill_objects+0xe3/0x410 mm/slub.c:7418
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_noprof+0x4c4/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa75/0xfd0 fs/gfs2/ops_fstype.c:503
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
page last free pid 4972 tgid 4972 ts 153690700258 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5068
 __alloc_skb+0x140/0x710 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 alloc_skb_with_frags+0xdd/0x760 net/core/skbuff.c:6803
 sock_alloc_send_pskb+0x89f/0xa40 net/core/sock.c:3050
 unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x48b/0x4e0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807f0a6380: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807f0a6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807f0a6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1a4/0x1d0 lib/list_debug.c:65
Read of size 8 at addr ffff88807f0a64c8 by task kworker/1:7/5767

CPU: 1 UID: 0 PID: 5767 Comm: kworker/1:7 Tainted: G    B        L      syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: events gfs2_withdraw_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1a4/0x1d0 lib/list_debug.c:65
 __list_del_entry_valid include/linux/list.h:140 [inline]
 __list_del_entry include/linux/list.h:261 [inline]
 list_del_init include/linux/list.h:333 [inline]
 gfs2_remove_from_ail+0x138/0x340 fs/gfs2/log.c:79
 gfs2_ail_empty_tr fs/gfs2/log.c:287 [inline]
 gfs2_ail_drain+0x39c/0x6b0 fs/gfs2/log.c:954
 do_withdraw+0xeb/0x300 fs/gfs2/util.c:126
 gfs2_withdraw_func+0x349/0x3d0 fs/gfs2/util.c:236
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 10057:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:351 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa17/0xfd0 fs/gfs2/ops_fstype.c:497
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
 do_mount fs/namespace.c:4350 [inline]
 __do_sys_mount fs/namespace.c:4566 [inline]
 __se_sys_mount fs/namespace.c:4543 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4543
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:264 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6509 [inline]
 kmem_cache_free+0x127/0x6c0 mm/slub.c:6636
 gfs2_glock_dealloc+0xd0/0x160 fs/gfs2/glock.c:134
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x5f0/0x1260 kernel/rcu/tree.c:2919
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 run_ksoftirqd kernel/softirq.c:1099 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1091
 smpboot_thread_fn+0x3d3/0xab0 kernel/smpboot.c:160
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 __call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3181
 gfs2_glock_free+0x35/0xa0 fs/gfs2/glock.c:150
 glock_work_func+0x437/0x4d0 fs/gfs2/glock.c:1003
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Second to last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 insert_work+0x36/0x230 kernel/workqueue.c:2272
 __queue_work+0xa60/0x1370 kernel/workqueue.c:2448
 __queue_delayed_work+0x357/0x450 kernel/workqueue.c:2617
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2669
 queue_delayed_work include/linux/workqueue.h:715 [inline]
 gfs2_glock_queue_work+0x75/0x120 fs/gfs2/glock.c:198
 do_xmote+0x453/0x680 fs/gfs2/glock.c:718
 run_queue+0x555/0x6a0 fs/gfs2/glock.c:757
 glock_work_func+0x35b/0x4d0 fs/gfs2/glock.c:987
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88807f0a63a8
 which belongs to the cache gfs2_glock(aspace) of size 1176
The buggy address is located 288 bytes inside of
 freed 1176-byte region [ffff88807f0a63a8, ffff88807f0a6840)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f0a4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
raw: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
head: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6706, tgid 6705 (syz.5.287), ts 164153393846
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab mm/slub.c:3462 [inline]
 new_slab+0xa9/0x6e0 mm/slub.c:3513
 refill_objects+0xe3/0x410 mm/slub.c:7418
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_noprof+0x4c4/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa75/0xfd0 fs/gfs2/ops_fstype.c:503
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
page last free pid 4972 tgid 4972 ts 153690700258 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5068
 __alloc_skb+0x140/0x710 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 alloc_skb_with_frags+0xdd/0x760 net/core/skbuff.c:6803
 sock_alloc_send_pskb+0x89f/0xa40 net/core/sock.c:3050
 unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x48b/0x4e0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807f0a6380: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807f0a6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88807f0a6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del include/linux/list.h:241 [inline]
BUG: KASAN: slab-use-after-free in __list_del_entry include/linux/list.h:264 [inline]
BUG: KASAN: slab-use-after-free in __list_del_entry include/linux/list.h:259 [inline]
BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:333 [inline]
BUG: KASAN: slab-use-after-free in gfs2_remove_from_ail+0x323/0x340 fs/gfs2/log.c:79
Write of size 8 at addr ffff88807f0a64c8 by task kworker/1:7/5767

CPU: 1 UID: 0 PID: 5767 Comm: kworker/1:7 Tainted: G    B        L      syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: events gfs2_withdraw_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 __list_del include/linux/list.h:241 [inline]
 __list_del_entry include/linux/list.h:264 [inline]
 __list_del_entry include/linux/list.h:259 [inline]
 list_del_init include/linux/list.h:333 [inline]
 gfs2_remove_from_ail+0x323/0x340 fs/gfs2/log.c:79
 gfs2_ail_empty_tr fs/gfs2/log.c:287 [inline]
 gfs2_ail_drain+0x39c/0x6b0 fs/gfs2/log.c:954
 do_withdraw+0xeb/0x300 fs/gfs2/util.c:126
 gfs2_withdraw_func+0x349/0x3d0 fs/gfs2/util.c:236
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 10057:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:351 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa17/0xfd0 fs/gfs2/ops_fstype.c:497
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
 do_mount fs/namespace.c:4350 [inline]
 __do_sys_mount fs/namespace.c:4566 [inline]
 __se_sys_mount fs/namespace.c:4543 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4543
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:264 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6509 [inline]
 kmem_cache_free+0x127/0x6c0 mm/slub.c:6636
 gfs2_glock_dealloc+0xd0/0x160 fs/gfs2/glock.c:134
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x5f0/0x1260 kernel/rcu/tree.c:2919
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 run_ksoftirqd kernel/softirq.c:1099 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1091
 smpboot_thread_fn+0x3d3/0xab0 kernel/smpboot.c:160
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 __call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3181
 gfs2_glock_free+0x35/0xa0 fs/gfs2/glock.c:150
 glock_work_func+0x437/0x4d0 fs/gfs2/glock.c:1003
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Second to last potentially related work creation:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 insert_work+0x36/0x230 kernel/workqueue.c:2272
 __queue_work+0xa60/0x1370 kernel/workqueue.c:2448
 __queue_delayed_work+0x357/0x450 kernel/workqueue.c:2617
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2669
 queue_delayed_work include/linux/workqueue.h:715 [inline]
 gfs2_glock_queue_work+0x75/0x120 fs/gfs2/glock.c:198
 do_xmote+0x453/0x680 fs/gfs2/glock.c:718
 run_queue+0x555/0x6a0 fs/gfs2/glock.c:757
 glock_work_func+0x35b/0x4d0 fs/gfs2/glock.c:987
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88807f0a63a8
 which belongs to the cache gfs2_glock(aspace) of size 1176
The buggy address is located 288 bytes inside of
 freed 1176-byte region [ffff88807f0a63a8, ffff88807f0a6840)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f0a4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
raw: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881404443c0 dead000000000100 dead000000000122
head: 0000000000000000 00000002000c000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6706, tgid 6705 (syz.5.287), ts 164153393846
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab mm/slub.c:3462 [inline]
 new_slab+0xa9/0x6e0 mm/slub.c:3513
 refill_objects+0xe3/0x410 mm/slub.c:7418
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_noprof+0x4c4/0x6a0 mm/slub.c:5010
 gfs2_glock_get+0x1e5/0x1260 fs/gfs2/glock.c:1074
 gfs2_inode_lookup+0x2e0/0x920 fs/gfs2/inode.c:149
 gfs2_lookup_root+0x57/0xe0 fs/gfs2/ops_fstype.c:428
 init_sb+0xa75/0xfd0 fs/gfs2/ops_fstype.c:503
 gfs2_fill_super+0x1acb/0x2d00 fs/gfs2/ops_fstype.c:1219
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1883
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x320 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount fs/namespace.c:3986 [inline]
 path_mount+0x7d0/0x2850 fs/namespace.c:4337
page last free pid 4972 tgid 4972 ts 153690700258 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5068
 __alloc_skb+0x140/0x710 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 alloc_skb_with_frags+0xdd/0x760 net/core/skbuff.c:6803
 sock_alloc_send_pskb+0x89f/0xa40 net/core/sock.c:3050
 unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x48b/0x4e0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807f0a6380: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807f0a6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88807f0a6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807f0a6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================