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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+0xb6/0x260 kernel/locking/rwsem.c:1404
Write of size 8 at addr ffff88818fea9070 by task kworker/u4:1/30211

CPU: 1 PID: 30211 Comm: kworker/u4:1 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 check_region_inline mm/kasan/generic.c:135 [inline]
 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:186
 __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+0xb6/0x260 kernel/locking/rwsem.c:1404
 down_read_trylock+0x9/0x10 kernel/locking/rwsem.c:1573
 trylock_super+0x1f/0xf0 fs/super.c:418
 __writeback_inodes_wb fs/fs-writeback.c:1792 [inline]
 wb_writeback+0x4da/0xc20 fs/fs-writeback.c:1907
 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline]
 wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2062
 wb_workfn+0xf8/0x3f0 fs/fs-writeback.c:2091
 process_one_work+0x726/0xc10 kernel/workqueue.c:2296
 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442
 kthread+0x349/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299

Allocated by task 24895:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516
 kasan_kmalloc include/linux/kasan.h:269 [inline]
 __kmalloc+0x1f7/0x360 mm/slub.c:4042
 __kmalloc_node include/linux/slab.h:418 [inline]
 kmalloc_node include/linux/slab.h:575 [inline]
 kvmalloc_node+0x82/0x130 mm/util.c:612
 kvmalloc include/linux/mm.h:822 [inline]
 kvmalloc_array include/linux/mm.h:840 [inline]
 alloc_fdtable+0xce/0x270 fs/file.c:134
 dup_fd+0x781/0xa40 fs/file.c:352
 copy_files+0xe6/0x200 kernel/fork.c:1518
 copy_process+0x128a/0x33a0 kernel/fork.c:2140
 kernel_clone+0x22d/0x900 kernel/fork.c:2524
 __do_sys_clone3 kernel/fork.c:2801 [inline]
 __se_sys_clone3 kernel/fork.c:2785 [inline]
 __x64_sys_clone3+0x375/0x3a0 kernel/fork.c:2785
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Freed by task 24895:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:360
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1604 [inline]
 slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630
 slab_free mm/slub.c:3212 [inline]
 kfree+0xc3/0x290 mm/slub.c:4200
 kvfree+0x35/0x40 mm/util.c:647
 __free_fdtable fs/file.c:34 [inline]
 put_files_struct+0x297/0x330 fs/file.c:462
 exit_files+0x80/0xa0 fs/file.c:487
 copy_process+0x2902/0x33a0 kernel/fork.c:2414
 kernel_clone+0x22d/0x900 kernel/fork.c:2524
 __do_sys_clone3 kernel/fork.c:2801 [inline]
 __se_sys_clone3 kernel/fork.c:2785 [inline]
 __x64_sys_clone3+0x375/0x3a0 kernel/fork.c:2785
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345
 insert_work+0x56/0x330 kernel/workqueue.c:1348
 __queue_work+0x971/0xd30 kernel/workqueue.c:1514
 queue_work_on+0xf2/0x150 kernel/workqueue.c:1541
 queue_work include/linux/workqueue.h:513 [inline]
 schedule_work include/linux/workqueue.h:574 [inline]
 destroy_super_rcu+0xea/0x100 fs/super.c:172
 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485
 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739
 __do_softirq+0x27e/0x596 kernel/softirq.c:305

Second to last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:2967 [inline]
 call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041
 __put_super+0x24c/0x2a0 fs/super.c:299
 put_super fs/super.c:313 [inline]
 deactivate_locked_super+0xe4/0x100 fs/super.c:346
 deactivate_super+0xa5/0xd0 fs/super.c:366
 cleanup_mnt+0x45f/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x147/0x1b0 kernel/task_work.c:154
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xc8/0xe0 kernel/entry/common.c:164
 exit_to_user_mode_prepare kernel/entry/common.c:191 [inline]
 syscall_exit_to_user_mode+0x77/0xa0 kernel/entry/common.c:266
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

The buggy address belongs to the object at ffff88818fea9000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 112 bytes inside of
 2048-byte region [ffff88818fea9000, ffff88818fea9800)
The buggy address belongs to the page:
page:ffffea00063faa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18fea8
head:ffffea00063faa00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 22843, ts 2608074149414, free_ts 2607924207130
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2386 [inline]
 prep_new_page mm/page_alloc.c:2392 [inline]
 get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160
 alloc_slab_page mm/slub.c:1815 [inline]
 allocate_slab+0x78/0x540 mm/slub.c:1817
 new_slab mm/slub.c:1878 [inline]
 new_slab_objects mm/slub.c:2636 [inline]
 ___slab_alloc+0x131/0x2e0 mm/slub.c:2800
 __slab_alloc+0x63/0xa0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 __kmalloc+0x24f/0x360 mm/slub.c:4038
 kmalloc include/linux/slab.h:557 [inline]
 sk_prot_alloc+0xbc/0x250 net/core/sock.c:1692
 sk_alloc+0x38/0x4c0 net/core/sock.c:1746
 tun_chr_open+0x7b/0x4a0 drivers/net/tun.c:3441
 misc_open+0x3ea/0x440 drivers/char/misc.c:141
 chrdev_open+0x5fb/0x680 fs/char_dev.c:414
 do_dentry_open+0x7a2/0x1090 fs/open.c:819
 vfs_open+0x73/0x80 fs/open.c:942
 do_open fs/namei.c:3329 [inline]
 path_openat+0x2638/0x2fd0 fs/namei.c:3448
 do_filp_open+0x200/0x440 fs/namei.c:3475
 do_sys_openat2+0x13b/0x470 fs/open.c:1211
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1332 [inline]
 __free_pages_ok+0x7f8/0x830 mm/page_alloc.c:1612
 free_the_page mm/page_alloc.c:5221 [inline]
 __free_pages+0x383/0x570 mm/page_alloc.c:5228
 __free_slab+0xd3/0x190 mm/slub.c:1903
 free_slab mm/slub.c:1918 [inline]
 discard_slab mm/slub.c:1924 [inline]
 unfreeze_partials+0x17d/0x1b0 mm/slub.c:2419
 put_cpu_partial+0xc8/0x190 mm/slub.c:2455
 __slab_free+0x2d8/0x3a0 mm/slub.c:3104
 do_slab_free mm/slub.c:3200 [inline]
 ___cache_free+0x11f/0x140 mm/slub.c:3219
 qlink_free+0x38/0x40 mm/kasan/quarantine.c:146
 qlist_free_all+0x4c/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:438
 kasan_slab_alloc include/linux/kasan.h:259 [inline]
 slab_post_alloc_hook include/../mm/slab.h:583 [inline]
 slab_alloc_node mm/slub.c:2956 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc+0x16c/0x300 mm/slub.c:2969
 getname_flags+0xba/0x510 fs/namei.c:141
 user_path_at_empty+0x2d/0x50 fs/namei.c:2728
 user_path_at include/linux/namei.h:59 [inline]
 ksys_umount fs/namespace.c:1761 [inline]
 __do_sys_umount fs/namespace.c:1769 [inline]
 __se_sys_umount fs/namespace.c:1767 [inline]
 __x64_sys_umount+0xf0/0x170 fs/namespace.c:1767
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46

Memory state around the buggy address:
 ffff88818fea8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88818fea8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88818fea9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88818fea9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88818fea9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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