EXT4-fs (loop4): Total free blocks count 0
EXT4-fs (loop4): Free/Dirty block details
EXT4-fs (loop4): free_blocks=0
EXT4-fs (loop4): dirty_blocks=2912
EXT4-fs (loop4): Block reservation details
==================================================================
BUG: KCSAN: data-race in xas_find_marked / xas_init_marks

read-write to 0xffff888125c8ab48 of 8 bytes by task 18374 on cpu 0:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
 node_clear_mark lib/xarray.c:102 [inline]
 xas_clear_mark lib/xarray.c:914 [inline]
 xas_init_marks+0x17e/0x320 lib/xarray.c:947
 xas_store+0x216/0xc90 lib/xarray.c:809
 page_cache_delete_batch mm/filemap.c:311 [inline]
 delete_from_page_cache_batch+0x33e/0x710 mm/filemap.c:333
 truncate_inode_pages_range+0x1bd/0x6a0 mm/truncate.c:368
 truncate_inode_pages mm/truncate.c:448 [inline]
 truncate_pagecache+0x53/0x70 mm/truncate.c:741
 ext4_setattr+0xa03/0xea0 fs/ext4/inode.c:5471
 notify_change+0x866/0x8e0 fs/attr.c:499
 do_truncate+0x116/0x150 fs/open.c:66
 do_sys_ftruncate+0x2ba/0x3b0 fs/open.c:194
 __do_sys_ftruncate fs/open.c:205 [inline]
 __se_sys_ftruncate fs/open.c:203 [inline]
 __x64_sys_ftruncate+0x33/0x40 fs/open.c:203
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888125c8ab48 of 8 bytes by task 8495 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1723 [inline]
 xas_find_marked+0x216/0x660 lib/xarray.c:1354
 find_get_entry+0x5d/0x290 mm/filemap.c:1960
 filemap_get_folios_tag+0x136/0x210 mm/filemap.c:2210
 mpage_prepare_extent_to_map+0x321/0xb70 fs/ext4/inode.c:2398
 ext4_do_writepages+0xa20/0x2100 fs/ext4/inode.c:2683
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2774
 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553
 __writeback_single_inode+0x91/0x860 fs/fs-writeback.c:1625
 writeback_sb_inodes+0x514/0xad0 fs/fs-writeback.c:1916
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:1987
 wb_writeback+0x264/0x6e0 fs/fs-writeback.c:2094
 wb_check_background_flush fs/fs-writeback.c:2164 [inline]
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0x67f/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2627 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700
 worker_thread+0x525/0x730 kernel/workqueue.c:2781
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0xffffff0000000000 -> 0xff80000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8495 Comm: kworker/u4:9 Tainted: G        W          6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: writeback wb_workfn (flush-7:4)
==================================================================
EXT4-fs (loop5): Delayed block allocation failed for inode 18 at logical offset 610 with max blocks 60 with error 28
EXT4-fs (loop5): This should not happen!! Data will be lost

EXT4-fs (loop5): Total free blocks count 0
EXT4-fs (loop5): Free/Dirty block details
EXT4-fs (loop5): free_blocks=0
EXT4-fs (loop5): dirty_blocks=64
EXT4-fs (loop5): Block reservation details
EXT4-fs (loop5): Delayed block allocation failed for inode 18 at logical offset 2050 with max blocks 952 with error 28
EXT4-fs (loop5): This should not happen!! Data will be lost

EXT4-fs (loop5): Total free blocks count 0
EXT4-fs (loop5): Free/Dirty block details
EXT4-fs (loop5): free_blocks=0
EXT4-fs (loop5): dirty_blocks=960
EXT4-fs (loop5): Block reservation details