==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:835 [inline]
BUG: KASAN: use-after-free in hlist_del include/linux/list.h:852 [inline]
BUG: KASAN: use-after-free in __cpuhp_state_remove_instance+0x58b/0x5b0 kernel/cpu.c:2002
Read of size 8 at addr ffff8880126a7c98 by task syz-executor.3/10854

CPU: 2 PID: 10854 Comm: syz-executor.3 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0xfa/0x151 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
 __hlist_del include/linux/list.h:835 [inline]
 hlist_del include/linux/list.h:852 [inline]
 __cpuhp_state_remove_instance+0x58b/0x5b0 kernel/cpu.c:2002
 cpuhp_state_remove_instance_nocalls include/linux/cpuhotplug.h:407 [inline]
 io_wq_create+0x6ca/0xbf0 fs/io-wq.c:1056
 io_init_wq_offload fs/io_uring.c:7792 [inline]
 io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811
 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773
 io_uring_install_fd fs/io_uring.c:9381 [inline]
 io_uring_create fs/io_uring.c:9532 [inline]
 io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f47549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54ff5ac EFLAGS: 00000282 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00000000000077ce RCX: 0000000020003e40
RDX: 00000000f54ff670 RSI: 000000000816c000 RDI: 0000000020ffa000
RBP: 0000000020003f00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 10854:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 ____kasan_kmalloc mm/kasan/common.c:506 [inline]
 ____kasan_kmalloc mm/kasan/common.c:465 [inline]
 __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:684 [inline]
 io_wq_create+0xc0/0xbf0 fs/io-wq.c:1002
 io_init_wq_offload fs/io_uring.c:7792 [inline]
 io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811
 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773
 io_uring_install_fd fs/io_uring.c:9381 [inline]
 io_uring_create fs/io_uring.c:9532 [inline]
 io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Freed by task 10854:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xe5/0x7b0 mm/slub.c:4213
 io_wq_destroy fs/io-wq.c:1091 [inline]
 io_wq_put+0x4d0/0x6d0 fs/io-wq.c:1098
 io_wq_create+0x92d/0xbf0 fs/io-wq.c:1053
 io_init_wq_offload fs/io_uring.c:7792 [inline]
 io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811
 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773
 io_uring_install_fd fs/io_uring.c:9381 [inline]
 io_uring_create fs/io_uring.c:9532 [inline]
 io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

The buggy address belongs to the object at ffff8880126a7c00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 152 bytes inside of
 192-byte region [ffff8880126a7c00, ffff8880126a7cc0)
The buggy address belongs to the page:
page:000000004c52f2b7 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880126a7600 pfn:0x126a7
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000100c0c0 0000000c0000000c ffff888010842a00
raw: ffff8880126a7600 000000008010000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880126a7b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880126a7c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880126a7c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                            ^
 ffff8880126a7d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880126a7d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================