==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_add_unless include/linux/atomic/atomic-instrumented.h:607 [inline]
BUG: KASAN: use-after-free in _atomic_dec_and_lock_irqsave+0x27/0x150 lib/dec_and_lock.c:41
Write of size 4 at addr ffff88801a88331c by task syz-executor.2/14951

CPU: 1 PID: 14951 Comm: syz-executor.2 Not tainted 5.16.0-rc8-next-20220110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xa5/0x3e0 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_add_unless include/linux/atomic/atomic-instrumented.h:607 [inline]
 _atomic_dec_and_lock_irqsave+0x27/0x150 lib/dec_and_lock.c:41
 put_ucounts+0x73/0x1c0 kernel/ucount.c:206
 put_cred_rcu+0x27a/0x520 kernel/cred.c:124
 rcu_do_batch kernel/rcu/tree.c:2536 [inline]
 rcu_core+0x7b8/0x1540 kernel/rcu/tree.c:2787
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:459
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:451 [inline]
 __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:764 [inline]
 ip_finish_output2+0x7d0/0x2170 net/ipv4/ip_output.c:222
 __ip_finish_output net/ipv4/ip_output.c:299 [inline]
 __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:281
 ip_finish_output+0x32/0x200 net/ipv4/ip_output.c:309
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:423
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1554
 udp_send_skb+0x6d2/0x11a0 net/ipv4/udp.c:967
 udp_sendmsg+0x1bad/0x2730 net/ipv4/udp.c:1254
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 ____sys_sendmsg+0x331/0x810 net/socket.c:2413
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467
 __sys_sendmmsg+0x195/0x470 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8f1428be99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f12c01168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f8f1439ef60 RCX: 00007f8f1428be99
RDX: 0400000000000075 RSI: 0000000020007fc0 RDI: 0000000000000004
RBP: 00007f8f142e5ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff6e7fccf R14: 00007f8f12c01300 R15: 0000000000022000
 </TASK>

Allocated by task 14958:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 ____kasan_kmalloc mm/kasan/common.c:515 [inline]
 ____kasan_kmalloc mm/kasan/common.c:474 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524
 kmalloc include/linux/slab.h:581 [inline]
 kzalloc include/linux/slab.h:715 [inline]
 alloc_ucounts+0x1c3/0x590 kernel/ucount.c:175
 set_cred_ucounts+0x163/0x320 kernel/cred.c:682
 copy_creds+0x708/0xb50 kernel/cred.c:373
 copy_process+0x1440/0x7300 kernel/fork.c:2034
 kernel_clone+0xe7/0xab0 kernel/fork.c:2557
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 10609:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kfree+0xce/0x380 mm/slub.c:4562
 put_ucounts+0x153/0x1c0 kernel/ucount.c:209
 do_dec_rlimit_put_ucounts+0xfb/0x1a0 kernel/ucount.c:299
 __sigqueue_free kernel/signal.c:455 [inline]
 __sigqueue_free kernel/signal.c:450 [inline]
 flush_sigqueue+0x18e/0x280 kernel/signal.c:469
 __exit_signal kernel/exit.c:155 [inline]
 release_task+0xbd0/0x17e0 kernel/exit.c:200
 wait_task_zombie kernel/exit.c:1116 [inline]
 wait_consider_task+0x2fa6/0x3b80 kernel/exit.c:1343
 do_wait_thread kernel/exit.c:1406 [inline]
 do_wait+0x6ca/0xce0 kernel/exit.c:1523
 kernel_wait4+0x14c/0x260 kernel/exit.c:1686
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1714
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 call_rcu+0x99/0x730 kernel/rcu/tree.c:3072
 neigh_parms_release net/core/neighbour.c:1706 [inline]
 neigh_parms_release+0x205/0x290 net/core/neighbour.c:1697
 addrconf_ifdown.isra.0+0x1003/0x1630 net/ipv6/addrconf.c:3871
 addrconf_notify+0xeb/0x1ba0 net/ipv6/addrconf.c:3651
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919
 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline]
 call_netdevice_notifiers net/core/dev.c:1945 [inline]
 unregister_netdevice_many+0x964/0x1850 net/core/dev.c:10408
 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:10938
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1368
 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1534
 queue_work_on+0xee/0x110 kernel/workqueue.c:1562
 queue_work include/linux/workqueue.h:502 [inline]
 call_usermodehelper_exec+0x347/0x4c0 kernel/umh.c:435
 call_modprobe kernel/kmod.c:98 [inline]
 __request_module+0x430/0xa60 kernel/kmod.c:170
 dev_load+0x1c8/0x200 net/core/dev_ioctl.c:449
 dev_ioctl+0x2a8/0xed0 net/core/dev_ioctl.c:512
 sock_do_ioctl+0x15a/0x230 net/socket.c:1136
 sock_ioctl+0x2f1/0x640 net/socket.c:1239
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801a883300
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 28 bytes inside of
 192-byte region [ffff88801a883300, ffff88801a8833c0)
The buggy address belongs to the page:
page:ffffea00006a20c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a883
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00007a12c0 dead000000000003 ffff888010c41a00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY), pid 10, ts 8225558335, free_ts 0
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4165
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381
 __alloc_pages_node include/linux/gfp.h:568 [inline]
 alloc_slab_page mm/slub.c:1801 [inline]
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0xaf/0x380 mm/slub.c:2004
 ___slab_alloc+0x6be/0xd60 mm/slub.c:3018
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 kmem_cache_alloc_node_trace+0x116/0x300 mm/slub.c:3280
 kmalloc_node include/linux/slab.h:599 [inline]
 kzalloc_node include/linux/slab.h:726 [inline]
 blk_alloc_flush_queue+0x91/0x320 block/blk-flush.c:476
 blk_mq_alloc_hctx block/blk-mq.c:3539 [inline]
 blk_mq_alloc_and_init_hctx block/blk-mq.c:3934 [inline]
 blk_mq_realloc_hw_ctxs+0xd4e/0x1460 block/blk-mq.c:3986
 blk_mq_init_allocated_queue+0x3ca/0x1370 block/blk-mq.c:4048
 blk_mq_init_queue_data block/blk-mq.c:3882 [inline]
 __blk_mq_alloc_disk+0xcb/0x1c0 block/blk-mq.c:3902
 floppy_alloc_disk+0x3d/0x390 drivers/block/floppy.c:4499
 do_floppy_init drivers/block/floppy.c:4580 [inline]
 floppy_async_init+0x2ec/0x2055 drivers/block/floppy.c:4750
 async_run_entry_fn+0x9d/0x550 kernel/async.c:127
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801a883200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801a883280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801a883300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88801a883380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88801a883400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================