syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / vfs_link

read-write to 0xffff888105ed82c0 of 8 bytes by task 1812 on cpu 0:
 __mark_inode_dirty+0x1ee/0x620 fs/fs-writeback.c:2417
 generic_update_time fs/inode.c:1860 [inline]
 inode_update_time fs/inode.c:1873 [inline]
 touch_atime+0x1c4/0x2e0 fs/inode.c:1945
 file_accessed include/linux/fs.h:2516 [inline]
 filemap_read+0x13b7/0x1430 mm/filemap.c:2728
 generic_file_read_iter+0x72/0x320 mm/filemap.c:2806
 ext4_file_read_iter+0x1e9/0x2a0
 __kernel_read+0x1ac/0x3e0 fs/read_write.c:428
 kernel_read+0xaa/0x160 fs/read_write.c:446
 prepare_binprm fs/exec.c:1664 [inline]
 search_binary_handler fs/exec.c:1718 [inline]
 exec_binprm+0x126/0x800 fs/exec.c:1775
 bprm_execve+0x379/0x4e0 fs/exec.c:1844
 do_execveat_common+0x853/0x960 fs/exec.c:1949
 do_execve fs/exec.c:2023 [inline]
 __do_sys_execve fs/exec.c:2099 [inline]
 __se_sys_execve fs/exec.c:2094 [inline]
 __x64_sys_execve+0x56/0x70 fs/exec.c:2094
 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

read to 0xffff888105ed82c0 of 8 bytes by task 1795 on cpu 1:
 vfs_link+0x523/0x5b0 fs/namei.c:4509
 do_linkat+0x1f1/0x640 fs/namei.c:4577
 __do_sys_linkat fs/namei.c:4605 [inline]
 __se_sys_linkat fs/namei.c:4602 [inline]
 __x64_sys_linkat+0x8c/0xa0 fs/namei.c:4602
 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: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1795 Comm: syz-fuzzer Not tainted 6.0.0-rc4-syzkaller-00059-gd2ec799d1c1b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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