syzbot

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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

write to 0xffff888103010100 of 8 bytes by task 3071 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1626 [inline]
 shmem_unlink+0x133/0x190 mm/shmem.c:3395
 vfs_unlink+0x265/0x3f0 fs/namei.c:4335
 do_unlinkat+0x236/0x4c0 fs/namei.c:4399
 __do_sys_unlink fs/namei.c:4447 [inline]
 __se_sys_unlink fs/namei.c:4445 [inline]
 __x64_sys_unlink+0x30/0x40 fs/namei.c:4445
 x64_sys_call+0x286b/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888103010100 of 8 bytes by task 3630 on cpu 0:
 inode_get_ctime include/linux/fs.h:1620 [inline]
 generic_fillattr+0x1e0/0x2f0 fs/stat.c:62
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x19b/0x1e0 fs/stat.c:176
 vfs_statx+0x140/0x320 fs/stat.c:248
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:462
 x64_sys_call+0x25ff/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000001ce61030 -> 0x000000001e173d30

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3630 Comm: udevd Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
udevd[3630]: inotify_add_watch(7, /dev/loop3p1, 10) failed: No such file or directory
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop0p1, logical block 0, async page read
Buffer I/O error on dev loop0p1, logical block 0, async page read
Buffer I/O error on dev loop0p1, logical block 0, async page read
Buffer I/O error on dev loop0p1, logical block 0, async page read
udevd[3630]: inotify_add_watch(7, /dev/loop0p1, 10) failed: No such file or directory
udevd[3630]: inotify_add_watch(7, /dev/loop0p1, 10) failed: No such file or directory
udevd[3630]: inotify_add_watch(7, /dev/loop0p1, 10) failed: No such file or directory
udevd[3630]: inotify_add_watch(7, /dev/loop0p4, 10) failed: No such file or directory
udevd[3630]: inotify_add_watch(7, /dev/loop1p1, 10) failed: No such file or directory
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0