syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff88810a710280 of 8 bytes by task 16572 on cpu 1:
 writeback_sb_inodes+0x2db/0xaa0 fs/fs-writeback.c:1880
 wb_writeback+0x23b/0x6c0 fs/fs-writeback.c:2065
 wb_do_writeback fs/fs-writeback.c:2208 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2248
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88810a710280 of 8 bytes by task 21996 on cpu 0:
 __mark_inode_dirty+0x199/0x7d0 fs/fs-writeback.c:2443
 mark_inode_dirty include/linux/fs.h:2127 [inline]
 dquot_alloc_space include/linux/quotaops.h:320 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0x1047/0x21c0 fs/ext4/mballoc.c:5571
 ext4_ext_map_blocks+0xe1f/0x36c0 fs/ext4/extents.c:4286
 ext4_map_blocks+0x738/0x1050 fs/ext4/inode.c:651
 ext4_alloc_file_blocks+0x272/0x6d0 fs/ext4/extents.c:4470
 ext4_fallocate+0x802/0x12b0 fs/ext4/extents.c:4757
 vfs_fallocate+0x369/0x3d0 fs/open.c:324
 do_vfs_ioctl+0x12a1/0x1360 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000020001 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21996 Comm: syz-executor.2 Not tainted 6.3.0-rc3-syzkaller-00394-g0ec57cfa721f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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