syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff88811b77d300 of 8 bytes by task 13724 on cpu 0:
 writeback_sb_inodes+0x494/0xdd0 fs/fs-writeback.c:1854
 __writeback_inodes_wb+0xb0/0x2a0 fs/fs-writeback.c:1936
 wb_writeback+0x280/0x650 fs/fs-writeback.c:2041
 wb_check_background_flush fs/fs-writeback.c:2107 [inline]
 wb_do_writeback+0x5b3/0x600 fs/fs-writeback.c:2195
 wb_workfn+0x88/0x260 fs/fs-writeback.c:2222
 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

read to 0xffff88811b77d300 of 8 bytes by task 1828 on cpu 1:
 __mark_inode_dirty+0xd5/0x620 fs/fs-writeback.c:2402
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x1c4/0x2e0 fs/inode.c:1941
 file_accessed include/linux/fs.h:2386 [inline]
 iterate_dir+0x343/0x390 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x80/0x190 fs/readdir.c:354
 __x64_sys_getdents64+0x3f/0x50 fs/readdir.c:354
 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+0x46/0xb0

value changed: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1828 Comm: syz-executor.5 Not tainted 5.19.0-rc4-syzkaller-00208-g69cb6c6556ad-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
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