loop0: detected capacity change from 0 to 32768
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 16 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: fatal: invalid metadata block - bh = 2049 (type: exp=14, found=8), function = gfs2_quota_init, file = fs/gfs2/quota.c, line = 1432
gfs2: fsid=syz:syz.0: about to withdraw this file system
gfs2: fsid=syz:syz.0: Journal recovery skipped for jid 0 until next mount.
gfs2: fsid=syz:syz.0: Glock dequeues delayed: 0
gfs2: fsid=syz:syz.0: File system withdrawn
CPU: 0 UID: 0 PID: 5115 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-03917-ga940d9a43e62 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 gfs2_withdraw+0xefa/0x1460 fs/gfs2/util.c:354
 gfs2_metatype_check_ii+0x79/0x90 fs/gfs2/util.c:523
 gfs2_metatype_check_i fs/gfs2/util.h:129 [inline]
 gfs2_quota_init+0x10d8/0x1440 fs/gfs2/quota.c:1432
 gfs2_make_fs_rw+0x43f/0x5e0 fs/gfs2/super.c:159
 gfs2_fill_super+0x22d8/0x2500 fs/gfs2/ops_fstype.c:1274
 get_tree_bdev+0x3f7/0x570 fs/super.c:1635
 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1329
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f7517f69a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3f75f41e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3f75f41ef0 RCX: 00007f3f7517f69a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f3f75f41eb0
RBP: 0000000020000000 R08: 00007f3f75f41ef0 R09: 0000000000208c1a
R10: 0000000000208c1a R11: 0000000000000246 R12: 0000000020000100
R13: 00007f3f75f41eb0 R14: 000000000001278f R15: 0000000020000080
 </TASK>
gfs2: fsid=syz:syz.0: can't make FS RW: -5
==================================================================
BUG: KASAN: slab-use-after-free in workqueue_sysfs_unregister kernel/workqueue.c:7372 [inline]
BUG: KASAN: slab-use-after-free in destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5781
Read of size 8 at addr ffff88800079c928 by task syz.0.0/5115

CPU: 0 UID: 0 PID: 5115 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-03917-ga940d9a43e62 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 workqueue_sysfs_unregister kernel/workqueue.c:7372 [inline]
 destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5781
 gfs2_fill_super+0x128a/0x2500 fs/gfs2/ops_fstype.c:1310
 get_tree_bdev+0x3f7/0x570 fs/super.c:1635
 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1329
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f7517f69a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3f75f41e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3f75f41ef0 RCX: 00007f3f7517f69a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f3f75f41eb0
RBP: 0000000020000000 R08: 00007f3f75f41ef0 R09: 0000000000208c1a
R10: 0000000000208c1a R11: 0000000000000246 R12: 0000000020000100
R13: 00007f3f75f41eb0 R14: 000000000001278f R15: 0000000020000080
 </TASK>

Allocated by task 5115:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4159 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171
 kmalloc_noprof include/linux/slab.h:694 [inline]
 kzalloc_noprof include/linux/slab.h:816 [inline]
 alloc_workqueue+0x1b0/0x1fe0 kernel/workqueue.c:5649
 gfs2_fill_super+0x1149/0x2500 fs/gfs2/ops_fstype.c:1191
 get_tree_bdev+0x3f7/0x570 fs/super.c:1635
 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1329
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 80:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2250 [inline]
 slab_free mm/slub.c:4474 [inline]
 kfree+0x149/0x360 mm/slub.c:4595
 rcu_do_batch kernel/rcu/tree.c:2569 [inline]
 rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

Last potentially related work creation:
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
 __call_rcu_common kernel/rcu/tree.c:3106 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210
 kthread_worker_fn+0x500/0xaf0 kernel/kthread.c:842
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff88800079c800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 296 bytes inside of
 freed 512-byte region [ffff88800079c800, ffff88800079ca00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79c
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0x7ff00000000040(head|node=0|zone=0|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 007ff00000000040 ffff88801ac41c80 ffffea000048f480 dead000000000003
raw: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 007ff00000000040 ffff88801ac41c80 ffffea000048f480 dead000000000003
head: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 007ff00000000001 ffffea000001e701 ffffffffffffffff 0000000000000000
head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1355, tgid 1355 (kworker/0:3), ts 82690349438, free_ts 67778788214
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
 prep_new_page mm/page_alloc.c:1508 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2319
 allocate_slab+0x5a/0x2f0 mm/slub.c:2482
 new_slab mm/slub.c:2535 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
 __slab_alloc+0x58/0xa0 mm/slub.c:3811
 __slab_alloc_node mm/slub.c:3864 [inline]
 slab_alloc_node mm/slub.c:4026 [inline]
 __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4185
 kmalloc_noprof include/linux/slab.h:690 [inline]
 drm_atomic_helper_crtc_duplicate_state+0x72/0xb0 drivers/gpu/drm/drm_atomic_state_helper.c:177
 drm_atomic_get_crtc_state+0x17f/0x400 drivers/gpu/drm/drm_atomic.c:362
 drm_atomic_get_plane_state+0x443/0x500 drivers/gpu/drm/drm_atomic.c:564
 drm_atomic_helper_dirtyfb+0xc64/0xe70 drivers/gpu/drm/drm_damage_helper.c:171
 drm_fbdev_shmem_helper_fb_dirty+0x151/0x2c0 drivers/gpu/drm/drm_fbdev_shmem.c:197
 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:383 [inline]
 drm_fb_helper_damage_work+0x275/0x880 drivers/gpu/drm/drm_fb_helper.c:406
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x870/0xd30 kernel/workqueue.c:3393
page last free pid 80 tgid 80 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1101 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2619
 stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_save_track+0x51/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3989 [inline]
 slab_alloc_node mm/slub.c:4038 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4081
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 __tcp_send_ack+0xa2/0x600 net/ipv4/tcp_output.c:4245
 tcp_delack_timer_handler+0x35f/0x510 net/ipv4/tcp_timer.c:343
 tcp_delack_timer+0x190/0x2f0 net/ipv4/tcp_timer.c:366
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1794
 expire_timers kernel/time/timer.c:1845 [inline]
 __run_timers kernel/time/timer.c:2419 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430
 run_timer_base kernel/time/timer.c:2439 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649

Memory state around the buggy address:
 ffff88800079c800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88800079c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88800079c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88800079c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88800079ca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================