loop0: detected capacity change from 0 to 32868
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: fatal: invalid metadata block - bh = 2073 (bad magic number), function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 490
gfs2: fsid=syz:syz.0: about to withdraw this file system
gfs2: fsid=syz:syz.0: File system withdrawn
CPU: 0 UID: 0 PID: 5107 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-08068-g1ec6d097897a #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_meta_check_ii+0x67/0x80 fs/gfs2/util.c:501
 gfs2_metatype_check_i fs/gfs2/util.h:126 [inline]
 gfs2_meta_buffer+0x325/0x410 fs/gfs2/meta_io.c:490
 gfs2_meta_inode_buffer fs/gfs2/meta_io.h:72 [inline]
 gfs2_inode_refresh+0xec/0x10b0 fs/gfs2/glops.c:478
 gfs2_instantiate+0x190/0x260 fs/gfs2/glock.c:468
 gfs2_glock_holder_ready fs/gfs2/glock.c:1345 [inline]
 gfs2_glock_wait+0x1df/0x2b0 fs/gfs2/glock.c:1365
 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline]
 gfs2_lookupi+0x3ee/0x5e0 fs/gfs2/inode.c:329
 gfs2_lookup_meta+0x100/0x200 fs/gfs2/inode.c:280
 init_journal+0x1bf/0x2420 fs/gfs2/ops_fstype.c:721
 init_inodes+0xdc/0x320 fs/gfs2/ops_fstype.c:864
 gfs2_fill_super+0x1c18/0x2500 fs/gfs2/ops_fstype.c:1249
 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: 0033:0x7f7580b7f69a
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:00007f758198ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f758198eef0 RCX: 00007f7580b7f69a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f758198eeb0
RBP: 0000000020000000 R08: 00007f758198eef0 R09: 0000000000008c9b
R10: 0000000000008c9b R11: 0000000000000246 R12: 0000000020000100
R13: 00007f758198eeb0 R14: 0000000000012760 R15: 0000000020000400
 </TASK>
gfs2: fsid=syz:syz.0: can't lookup journal index: 0
==================================================================
BUG: KASAN: slab-use-after-free in workqueue_sysfs_unregister kernel/workqueue.c:7413 [inline]
BUG: KASAN: slab-use-after-free in destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5822
Read of size 8 at addr ffff88803f57b928 by task syz.0.0/5107

CPU: 0 UID: 0 PID: 5107 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-08068-g1ec6d097897a #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:7413 [inline]
 destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5822
 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: 0033:0x7f7580b7f69a
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:00007f758198ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f758198eef0 RCX: 00007f7580b7f69a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f758198eeb0
RBP: 0000000020000000 R08: 00007f758198eef0 R09: 0000000000008c9b
R10: 0000000000008c9b R11: 0000000000000246 R12: 0000000020000100
R13: 00007f758198eeb0 R14: 0000000000012760 R15: 0000000020000400
 </TASK>

Allocated by task 5107:
 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:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4265 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4277
 kmalloc_noprof include/linux/slab.h:882 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 __alloc_workqueue+0x10a/0x1f20 kernel/workqueue.c:5655
 alloc_workqueue+0xd6/0x210 kernel/workqueue.c:5758
 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 73:
 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 mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:2343 [inline]
 slab_free mm/slub.c:4580 [inline]
 kfree+0x1a0/0x440 mm/slub.c:4728
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
 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:1037 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037
 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:3086 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190
 kthread_worker_fn+0x500/0xb70 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 ffff88803f57b800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 296 bytes inside of
 freed 512-byte region [ffff88803f57b800, ffff88803f57ba00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f57a
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801ac41c80 ffffea0000ced800 0000000000000002
raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 04fff00000000040 ffff88801ac41c80 ffffea0000ced800 0000000000000002
head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 04fff00000000001 ffffea0000fd5e81 ffffffffffffffff 0000000000000000
head: ffff888000000002 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 21, tgid 21 (cpuhp/0), ts 67793135433, free_ts 56210089503
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x120 mm/slub.c:2413
 allocate_slab+0x5a/0x2f0 mm/slub.c:2579
 new_slab mm/slub.c:2632 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819
 __slab_alloc+0x58/0xa0 mm/slub.c:3909
 __slab_alloc_node mm/slub.c:3962 [inline]
 slab_alloc_node mm/slub.c:4123 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_node_noprof+0x286/0x440 mm/slub.c:4271
 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:658
 kvmalloc_array_node_noprof include/linux/slab.h:1040 [inline]
 alloc_swap_slot_cache+0x4d/0x360 mm/swap_slots.c:128
 cpuhp_invoke_callback+0x48d/0x830 kernel/cpu.c:194
 cpuhp_thread_fun+0x41c/0x810 kernel/cpu.c:1102
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
page last free pid 5059 tgid 5059 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638
 mm_free_pgd kernel/fork.c:802 [inline]
 __mmdrop+0xb9/0x3d0 kernel/fork.c:918
 exec_mmap+0x680/0x710 fs/exec.c:1014
 begin_new_exec+0x12c0/0x2050 fs/exec.c:1280
 load_elf_binary+0x966/0x2710 fs/binfmt_elf.c:996
 search_binary_handler fs/exec.c:1752 [inline]
 exec_binprm fs/exec.c:1794 [inline]
 bprm_execve+0xaf8/0x1770 fs/exec.c:1845
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1952
 do_execve fs/exec.c:2026 [inline]
 __do_sys_execve fs/exec.c:2102 [inline]
 __se_sys_execve fs/exec.c:2097 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2097
 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

Memory state around the buggy address:
 ffff88803f57b800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803f57b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803f57b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88803f57b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803f57ba00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================