R13: 00007fde42011d7d R14: 000000000003d5b1 R15: 00007ffe919d21d0
 </TASK>
gfs2: fsid=syz:syz.0: about to withdraw this file system
==================================================================
BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
Read of size 8 at addr ffff888061ab2078 by task syz-executor/5821

CPU: 1 UID: 0 PID: 5821 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 list_lru_add+0xf2/0x270 mm/list_lru.c:171
 qd_put+0x114/0x190 fs/gfs2/quota.c:342
 gfs2_quota_sync+0x3c4/0x460 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x4c/0xb0 fs/gfs2/super.c:658
 sync_filesystem+0xee/0x230 fs/sync.c:56
 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622
 kill_block_super+0x44/0x90 fs/super.c:1723
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1317
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde41f909f7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe919d1048 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fde42011d7d RCX: 00007fde41f909f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe919d1100
RBP: 00007ffe919d1100 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe919d2190
R13: 00007fde42011d7d R14: 000000000003d5b1 R15: 00007ffe919d21d0
 </TASK>

Allocated by task 7637:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4982 [inline]
 slab_alloc_node mm/slub.c:5292 [inline]
 kmem_cache_alloc_noprof+0x37d/0x700 mm/slub.c:5299
 qd_alloc+0x50/0x250 fs/gfs2/quota.c:234
 gfs2_quota_init+0x762/0x1200 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x143/0x220 fs/gfs2/super.c:149
 gfs2_fill_super+0x1c02/0x2270 fs/gfs2/ops_fstype.c:1279
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1336
 vfs_get_tree+0x92/0x2b0 fs/super.c:1752
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3641 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3717
 do_mount fs/namespace.c:4040 [inline]
 __do_sys_mount fs/namespace.c:4228 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4205
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7635:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2547 [inline]
 slab_free mm/slub.c:6642 [inline]
 kmem_cache_free+0x19b/0x690 mm/slub.c:6752
 gfs2_qd_dealloc+0x70/0xe0 fs/gfs2/quota.c:111
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x286/0x870 kernel/softirq.c:626
 do_softirq+0xec/0x180 kernel/softirq.c:523
 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450
 sock_orphan include/net/sock.h:2113 [inline]
 netlink_release+0xe65/0x1ac0 net/netlink/af_netlink.c:726
 __sock_release net/socket.c:662 [inline]
 sock_close+0xc3/0x240 net/socket.c:1459
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3123 [inline]
 call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243
 qd_ungrab_sync fs/gfs2/quota.c:493 [inline]
 gfs2_quota_sync+0x30c/0x460 fs/gfs2/quota.c:1351
 gfs2_sync_fs+0x4c/0xb0 fs/gfs2/super.c:658
 sync_filesystem+0xee/0x230 fs/sync.c:56
 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622
 kill_block_super+0x44/0x90 fs/super.c:1723
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1317
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888061ab2000
 which belongs to the cache gfs2_quotad of size 272
The buggy address is located 120 bytes inside of
 freed 272-byte region [ffff888061ab2000, ffff888061ab2110)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888061ab2000 pfn:0x61ab2
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff8881436edb40 dead000000000122 0000000000000000
raw: ffff888061ab2000 00000000800c000b 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 7637, tgid 7634 (syz.1.333), ts 227221577976, free_ts 205794643970
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5209
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3063 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3236
 new_slab mm/slub.c:3290 [inline]
 ___slab_alloc+0xf56/0x1990 mm/slub.c:4659
 __slab_alloc+0x65/0x100 mm/slub.c:4782
 __slab_alloc_node mm/slub.c:4858 [inline]
 slab_alloc_node mm/slub.c:5280 [inline]
 kmem_cache_alloc_noprof+0x40f/0x700 mm/slub.c:5299
 qd_alloc+0x50/0x250 fs/gfs2/quota.c:234
 gfs2_quota_init+0x762/0x1200 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x143/0x220 fs/gfs2/super.c:149
 gfs2_fill_super+0x1c02/0x2270 fs/gfs2/ops_fstype.c:1279
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1336
 vfs_get_tree+0x92/0x2b0 fs/super.c:1752
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3641 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3717
page last free pid 6154 tgid 6154 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
 discard_slab mm/slub.c:3334 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3880
 put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3955
 __slab_free+0x2b9/0x390 mm/slub.c:5933
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4982 [inline]
 slab_alloc_node mm/slub.c:5292 [inline]
 __do_kmalloc_node mm/slub.c:5653 [inline]
 __kmalloc_noprof+0x3cf/0x800 mm/slub.c:5666
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kmalloc_array_noprof include/linux/slab.h:1003 [inline]
 lo_rw_aio+0x3fd/0xfa0 drivers/block/loop.c:359
 do_req_filebacked drivers/block/loop.c:-1 [inline]
 loop_handle_cmd drivers/block/loop.c:1923 [inline]
 loop_process_work+0x835/0xf90 drivers/block/loop.c:1958
 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267
 process_scheduled_works kernel/workqueue.c:3350 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888061ab1f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff888061ab1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888061ab2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff888061ab2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888061ab2100: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================