syzbot

loop4: detected capacity change from 0 to 264192
 loop4: p1 < > p2 p3 p4
loop4: p2 size 1073741824 extends beyond EOD, truncated
loop4: p3 size 1912633224 extends beyond EOD, truncated
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BUG: KCSAN: data-race in drop_nlink / vfs_getattr_nosec

write to 0xffff888104eb90c0 of 4 bytes by task 21 on cpu 0:
 drop_nlink+0x37/0x90 fs/inode.c:309
 shmem_unlink+0x17b/0x1a0 mm/shmem.c:2948
 vfs_unlink+0x257/0x450 fs/namei.c:4100
 handle_remove drivers/base/devtmpfs.c:335 [inline]
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop+0x87c/0x930 drivers/base/devtmpfs.c:395
 devtmpfsd+0x3f/0x40 drivers/base/devtmpfs.c:437
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

read to 0xffff888104eb90c0 of 4 bytes by task 1102 on cpu 1:
 generic_fillattr fs/stat.c:49 [inline]
 vfs_getattr_nosec+0x1c1/0x2f0 fs/stat.c:126
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x138/0x2a0 fs/stat.c:225
 vfs_fstatat fs/stat.c:243 [inline]
 vfs_stat include/linux/fs.h:3354 [inline]
 __do_sys_newstat fs/stat.c:385 [inline]
 __se_sys_newstat+0x5d/0x250 fs/stat.c:381
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:381
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1102 Comm: syz-executor.4 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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