syzbot

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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

read-write to 0xffff888103e8a408 of 8 bytes by task 2211 on cpu 0:
 shmem_unlink+0xfe/0x180 mm/shmem.c:2927
 shmem_rename2+0x194/0x2c0 mm/shmem.c:3003
 vfs_rename+0x8f5/0xb60 fs/namei.c:4676
 do_renameat2+0x6ce/0x9f0 fs/namei.c:4827
 __do_sys_rename fs/namei.c:4873 [inline]
 __se_sys_rename fs/namei.c:4871 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4871
 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

read to 0xffff888103e8a408 of 8 bytes by task 1904 on cpu 1:
 i_size_read include/linux/fs.h:840 [inline]
 generic_fillattr+0x203/0x2b0 fs/stat.c:53
 shmem_getattr+0x22c/0x2c0 mm/shmem.c:1061
 vfs_getattr_nosec fs/stat.c:123 [inline]
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x26e/0x3d0 fs/stat.c:232
 vfs_fstatat fs/stat.c:255 [inline]
 __do_sys_newfstatat fs/stat.c:425 [inline]
 __se_sys_newfstatat+0x8a/0x290 fs/stat.c:419
 __x64_sys_newfstatat+0x51/0x60 fs/stat.c:419
 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: 0x0000000000001748 -> 0x0000000000001734

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1904 Comm: udevd Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop3, logical block 0, async page read
I/O error, dev loop3, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop3, logical block 3, async page read
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0