==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline]
BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline]
BUG: KASAN: use-after-free in __down_read_trylock kernel/locking/rwsem.c:1393 [inline]
BUG: KASAN: use-after-free in down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1553
Write of size 8 at addr ffff88810f89e070 by task kworker/u4:2/311

CPU: 1 PID: 311 Comm: kworker/u4:2 Not tainted 5.10.221-syzkaller-1003196-g1240968f7644 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: writeback wb_workfn (flush-7:3)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline]
 atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline]
 __down_read_trylock kernel/locking/rwsem.c:1393 [inline]
 down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1553
 trylock_super+0x1f/0xf0 fs/super.c:418
 __writeback_inodes_wb fs/fs-writeback.c:1795 [inline]
 wb_writeback+0x49d/0xc60 fs/fs-writeback.c:1910
 wb_check_background_flush fs/fs-writeback.c:1978 [inline]
 wb_do_writeback fs/fs-writeback.c:2066 [inline]
 wb_workfn+0xc12/0x1110 fs/fs-writeback.c:2094
 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301
 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447
 kthread+0x34b/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Allocated by task 6110:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974
 kmalloc include/linux/slab.h:552 [inline]
 f2fs_kmalloc fs/f2fs/f2fs.h:3348 [inline]
 f2fs_kzalloc fs/f2fs/f2fs.h:3354 [inline]
 build_curseg fs/f2fs/segment.c:4523 [inline]
 f2fs_build_segment_manager+0x19b8/0x49d0 fs/f2fs/segment.c:5264
 f2fs_fill_super+0x60c5/0x7e30 fs/f2fs/super.c:4273
 mount_bdev+0x262/0x370 fs/super.c:1429
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4553
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1559
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2910
 path_mount+0x56f/0xcb0 fs/namespace.c:3240
 do_mount fs/namespace.c:3253 [inline]
 __do_sys_mount fs/namespace.c:3461 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3438
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 365:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kfree+0xc3/0x270 mm/slub.c:4191
 destroy_curseg fs/f2fs/segment.c:5340 [inline]
 f2fs_destroy_segment_manager+0xaf7/0xef0 fs/f2fs/segment.c:5388
 f2fs_put_super+0x6cd/0xc10 fs/f2fs/super.c:1627
 generic_shutdown_super+0x14f/0x2d0 fs/super.c:465
 kill_block_super+0x7e/0xe0 fs/super.c:1456
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4585
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:165
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 insert_work+0x56/0x310 kernel/workqueue.c:1352
 __queue_work+0x970/0xd10 kernel/workqueue.c:1518
 queue_work_on+0x105/0x160 kernel/workqueue.c:1545
 queue_work include/linux/workqueue.h:515 [inline]
 schedule_work include/linux/workqueue.h:576 [inline]
 destroy_super_rcu+0xd1/0xe0 fs/super.c:172
 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494
 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2976 [inline]
 call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050
 __put_super+0x25c/0x2b0 fs/super.c:299
 put_super fs/super.c:313 [inline]
 deactivate_locked_super+0xe1/0x110 fs/super.c:346
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:165
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810f89e000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 112 bytes inside of
 2048-byte region [ffff88810f89e000, ffff88810f89e800)
The buggy address belongs to the page:
page:ffffea00043e2600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f898
head:ffffea00043e2600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042d80
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 53, ts 51794645180, free_ts 51784703199
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536
 __kmalloc_reserve net/core/skbuff.c:144 [inline]
 __alloc_skb+0xbc/0x510 net/core/skbuff.c:212
 alloc_skb include/linux/skbuff.h:1126 [inline]
 alloc_skb_with_frags+0xa1/0x570 net/core/skbuff.c:5951
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2388
 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2405
 mld_newpack+0x1b2/0x990 net/ipv6/mcast.c:1604
 add_grhead net/ipv6/mcast.c:1707 [inline]
 add_grec+0xf63/0x13b0 net/ipv6/mcast.c:1838
 mld_send_initial_cr+0x1ef/0x2b0 net/ipv6/mcast.c:2088
 ipv6_mc_dad_complete+0x73/0x3a0 net/ipv6/mcast.c:2100
 addrconf_dad_completed+0x6df/0xd90 net/ipv6/addrconf.c:4262
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page mm/page_alloc.c:3391 [inline]
 free_the_page+0x9e/0x370 mm/page_alloc.c:5407
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 free_pages+0x7c/0x90 mm/page_alloc.c:5429
 _pgd_free arch/x86/mm/pgtable.c:420 [inline]
 pgd_free+0x17d/0x190 arch/x86/mm/pgtable.c:476
 mm_free_pgd kernel/fork.c:675 [inline]
 __mmdrop+0xb0/0x490 kernel/fork.c:726
 mmdrop include/linux/sched/mm.h:49 [inline]
 finish_task_switch+0x1e6/0x5a0 kernel/sched/core.c:3903
 context_switch kernel/sched/core.c:4049 [inline]
 __schedule+0xbee/0x1330 kernel/sched/core.c:4804
 schedule+0x13d/0x1d0 kernel/sched/core.c:4882
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4941
 __mutex_lock_common kernel/locking/mutex.c:1053 [inline]
 __mutex_lock+0x7b8/0xf20 kernel/locking/mutex.c:1117
 __mutex_lock_killable_slowpath+0xe/0x10 kernel/locking/mutex.c:1385
 mutex_lock_killable+0xd8/0x110 kernel/locking/mutex.c:1352
 lo_open+0x1d/0xc0 drivers/block/loop.c:1892
 __blkdev_get+0x38f/0x12f0 fs/block_dev.c:1561
 blkdev_get fs/block_dev.c:1653 [inline]
 blkdev_open+0x241/0x480 fs/block_dev.c:1770

Memory state around the buggy address:
 ffff88810f89df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810f89df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810f89e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88810f89e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810f89e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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