syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff88810b0dece0 of 8 bytes by task 12829 on cpu 1:
 writeback_sb_inodes+0x2ce/0xa30 fs/fs-writeback.c:1878
 wb_writeback+0x26b/0x650 fs/fs-writeback.c:2063
 wb_do_writeback+0x101/0x600 fs/fs-writeback.c:2206
 wb_workfn+0x88/0x260 fs/fs-writeback.c:2246
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88810b0dece0 of 8 bytes by task 15709 on cpu 0:
 __mark_inode_dirty+0x4f/0x730 fs/fs-writeback.c:2401
 mark_inode_dirty_sync include/linux/fs.h:2467 [inline]
 dquot_free_space include/linux/quotaops.h:385 [inline]
 dquot_free_block include/linux/quotaops.h:395 [inline]
 ext4_mb_new_blocks+0xcca/0x1000 fs/ext4/mballoc.c:5654
 ext4_ext_map_blocks+0xd7d/0x1bf0 fs/ext4/extents.c:4286
 ext4_map_blocks+0x72d/0x1040 fs/ext4/inode.c:651
 ext4_alloc_file_blocks+0x285/0x720 fs/ext4/extents.c:4470
 ext4_fallocate+0x349/0x440 fs/ext4/extents.c:4757
 vfs_fallocate+0x355/0x3d0 fs/open.c:323
 do_vfs_ioctl+0x12cf/0x1390 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x83/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15709 Comm: syz-executor.4 Not tainted 6.2.0-rc2-syzkaller-00010-g69b41ac87e4a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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