==================================================================
BUG: KASAN: use-after-free in io_wq_worker_running+0x114/0x130 io_uring/io-wq.c:674
Read of size 4 at addr ffff88803bea4804 by task iou-wrk-8147/8166

CPU: 0 PID: 8166 Comm: iou-wrk-8147 Not tainted 6.2.0-rc2-syzkaller-00282-g0a71553536d2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
 io_wq_worker_running+0x114/0x130 io_uring/io-wq.c:674
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
 seq_read_iter+0xe3/0x1280 fs/seq_file.c:182
 seq_read+0x171/0x210 fs/seq_file.c:162
 loop_rw_iter+0x1be/0x540 io_uring/rw.c:461
 io_iter_do_read io_uring/rw.c:645 [inline]
 io_iter_do_read io_uring/rw.c:638 [inline]
 io_read+0x101f/0x1420 io_uring/rw.c:766
 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856
 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932
 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587
 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 8147:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
 kmalloc_node include/linux/slab.h:606 [inline]
 kzalloc_node include/linux/slab.h:731 [inline]
 create_io_worker+0x10c/0x630 io_uring/io-wq.c:801
 create_worker_cb+0x1fb/0x270 io_uring/io-wq.c:339
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 get_signal+0x1c7/0x2450 kernel/signal.c:2635
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 8166:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800
 io_wq_cancel_tw_create io_uring/io-wq.c:1233 [inline]
 io_queue_worker_create+0x567/0x660 io_uring/io-wq.c:381
 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410
 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x16e/0x1b0 kernel/sched/core.c:6628
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
 seq_read_iter+0xe3/0x1280 fs/seq_file.c:182
 seq_read+0x171/0x210 fs/seq_file.c:162
 loop_rw_iter+0x1be/0x540 io_uring/rw.c:461
 io_iter_do_read io_uring/rw.c:645 [inline]
 io_iter_do_read io_uring/rw.c:638 [inline]
 io_read+0x101f/0x1420 io_uring/rw.c:766
 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856
 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932
 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587
 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
 task_work_add+0x7f/0x2c0 kernel/task_work.c:48
 io_queue_worker_create+0x41d/0x660 io_uring/io-wq.c:373
 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410
 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x16e/0x1b0 kernel/sched/core.c:6628
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
 seq_read_iter+0xe3/0x1280 fs/seq_file.c:182
 seq_read+0x171/0x210 fs/seq_file.c:162
 loop_rw_iter+0x1be/0x540 io_uring/rw.c:461
 io_iter_do_read io_uring/rw.c:645 [inline]
 io_iter_do_read io_uring/rw.c:638 [inline]
 io_read+0x101f/0x1420 io_uring/rw.c:766
 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856
 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932
 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587
 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
 task_work_add+0x7f/0x2c0 kernel/task_work.c:48
 io_queue_worker_create+0x41d/0x660 io_uring/io-wq.c:373
 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410
 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x16e/0x1b0 kernel/sched/core.c:6628
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
 seq_read_iter+0xe3/0x1280 fs/seq_file.c:182
 seq_read+0x171/0x210 fs/seq_file.c:162
 loop_rw_iter+0x1be/0x540 io_uring/rw.c:461
 io_iter_do_read io_uring/rw.c:645 [inline]
 io_iter_do_read io_uring/rw.c:638 [inline]
 io_read+0x101f/0x1420 io_uring/rw.c:766
 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856
 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932
 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587
 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88803bea4800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes inside of
 512-byte region [ffff88803bea4800, ffff88803bea4a00)

The buggy address belongs to the physical page:
page:ffffea0000efa900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3bea4
head:ffffea0000efa900 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5123, tgid 5123 (syz-executor.4), ts 442945117602, free_ts 0
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2286
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:492 [inline]
 __alloc_skb+0xe9/0x310 net/core/skbuff.c:565
 alloc_skb include/linux/skbuff.h:1270 [inline]
 nlmsg_new include/net/netlink.h:1002 [inline]
 mpls_netconf_notify_devconf+0x4a/0x110 net/mpls/af_mpls.c:1188
 mpls_dev_sysctl_register+0x1fe/0x2d0 net/mpls/af_mpls.c:1425
 mpls_add_dev net/mpls/af_mpls.c:1472 [inline]
 mpls_dev_notify+0x450/0x930 net/mpls/af_mpls.c:1612
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
 call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
 call_netdevice_notifiers net/core/dev.c:1996 [inline]
 register_netdevice+0xfb4/0x1640 net/core/dev.c:10078
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:308 [inline]
 nsim_create+0x437/0x5c0 drivers/net/netdevsim/netdev.c:357
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88803bea4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803bea4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803bea4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88803bea4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803bea4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================