syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff888109dc5240 of 8 bytes by task 32193 on cpu 1:
 writeback_sb_inodes+0x2d7/0xaa0 fs/fs-writeback.c:1883
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:1965
 wb_writeback+0x24d/0x6c0 fs/fs-writeback.c:2070
 wb_check_background_flush fs/fs-writeback.c:2136 [inline]
 wb_do_writeback fs/fs-writeback.c:2224 [inline]
 wb_workfn+0x67f/0x8d0 fs/fs-writeback.c:2251
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888109dc5240 of 8 bytes by task 3074 on cpu 0:
 __mark_inode_dirty+0x58/0x7d0 fs/fs-writeback.c:2406
 generic_update_time fs/inode.c:1859 [inline]
 inode_update_time fs/inode.c:1872 [inline]
 touch_atime+0x1e2/0x310 fs/inode.c:1944
 file_accessed include/linux/fs.h:2198 [inline]
 iterate_dir+0x347/0x390 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x88/0x1a0 fs/readdir.c:354
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:354
 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: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3074 Comm: syz-executor.4 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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