XFS (loop2): Quotacheck: Done.
==================================================================
BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x77/0x1f80
Read of size 8 at addr ffffc9000520f8d8 by task syz-executor.2/14696

CPU: 1 PID: 14696 Comm: syz-executor.2 Not tainted 6.2.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 <TASK>
 dump_stack_lvl+0x12e/0x1d0
 print_report+0x163/0x510
 kasan_report+0xce/0x100
 __lock_acquire+0x77/0x1f80
 lock_acquire+0x214/0x600
 _raw_spin_lock_irqsave+0xb7/0x100
 down+0x39/0xc0
 xfs_buf_lock+0x13b/0x4f0
 xfs_buf_delwri_submit_buffers+0x16c/0x8f0
 xfs_buf_delwri_submit+0xb8/0x240
 xfs_qm_shrink_scan+0x1b8/0x380
 do_shrink_slab+0x46f/0xc70
 shrink_slab+0x175/0x730
 drop_slab+0xee/0x1c0
 drop_caches_sysctl_handler+0x5c/0xf0
 proc_sys_call_handler+0x498/0x770
 do_iter_write+0x63b/0xaa0
 iter_file_splice_write+0x770/0xf00
 direct_splice_actor+0xe2/0x1a0
 splice_direct_to_actor+0x42e/0xa60
 do_splice_direct+0x26a/0x3b0
 do_sendfile+0x508/0xcd0
 __se_sys_sendfile64+0xaa/0x160
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd4dc28c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd4dcfaf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd4dc3abf80 RCX: 00007fd4dc28c0d9
RDX: 0000000020002080 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00007fd4dc2e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000870 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd330f842f R14: 00007fd4dcfaf300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc90005208000, ffffc90005211000) created by:
 copy_process+0x3d5/0x3b60

The buggy address belongs to the physical page:
page:ffffea0001f68780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7da1e
memcg:ffff8880251feb02
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff8880251feb02
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 14695, tgid 14695 (syz-executor.1), ts 395910156678, free_ts 395464434874
 get_page_from_freelist+0x3792/0x3910
 __alloc_pages+0x291/0x7f0
 __vmalloc_node_range+0x700/0x1080
 dup_task_struct+0x575/0x690
 copy_process+0x3d5/0x3b60
 kernel_clone+0x17d/0x700
 __x64_sys_clone+0x228/0x290
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 free_unref_page_prepare+0xf0e/0xf70
 free_unref_page_list+0x6be/0x960
 release_pages+0x1a07/0x1bc0
 __pagevec_release+0x66/0xe0
 invalidate_mapping_pagevec+0x3f1/0x4c0
 xfs_free_buftarg+0x77/0xd0
 xfs_fs_put_super+0x21e/0x2b0
 generic_shutdown_super+0x113/0x2d0
 kill_block_super+0x79/0xc0
 deactivate_locked_super+0x75/0xd0
 cleanup_mnt+0x3af/0x430
 task_work_run+0x20a/0x290
 exit_to_user_mode_loop+0xd1/0xf0
 exit_to_user_mode_prepare+0xb1/0x140
 syscall_exit_to_user_mode+0x54/0x2d0
 do_syscall_64+0x4d/0xc0

Memory state around the buggy address:
 ffffc9000520f780: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00
 ffffc9000520f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000520f880: 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3
                                                    ^
 ffffc9000520f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000520f980: 00 00 00 00 f1 f1 f1 f1 00 00 f3 f3 00 00 00 00
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