syzbot

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BUG: KCSAN: data-race in lookup_fast / vfs_unlink

write to 0xffff888129d2b840 of 4 bytes by task 2477 on cpu 1:
 dont_mount include/linux/dcache.h:348 [inline]
 vfs_unlink+0x2c6/0x580 fs/namei.c:4152
 do_unlinkat+0x278/0x540 fs/namei.c:4218
 __do_sys_unlink fs/namei.c:4266 [inline]
 __se_sys_unlink fs/namei.c:4264 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4264
 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+0x44/0xae

read to 0xffff888129d2b840 of 4 bytes by task 1441 on cpu 0:
 d_revalidate fs/namei.c:853 [inline]
 lookup_fast+0x172/0x360 fs/namei.c:1656
 walk_component+0x6d/0x360 fs/namei.c:2016
 lookup_last fs/namei.c:2475 [inline]
 path_lookupat+0x12d/0x3d0 fs/namei.c:2499
 filename_lookup+0x130/0x310 fs/namei.c:2528
 user_path_at_empty+0x3e/0x110 fs/namei.c:2851
 do_readlinkat+0x97/0x210 fs/stat.c:457
 __do_sys_readlink fs/stat.c:490 [inline]
 __se_sys_readlink fs/stat.c:487 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:487
 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+0x44/0xae

value changed: 0x00600008 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1441 Comm: udevd Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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