netdevsim netdevsim5 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim5 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim5 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
==================================================================
BUG: KCSAN: data-race in shmem_getattr / shmem_recalc_inode

read-write to 0xffff888118440010 of 8 bytes by task 21273 on cpu 0:
 shmem_recalc_inode+0x36/0x1b0 mm/shmem.c:443
 shmem_alloc_and_add_folio mm/shmem.c:1960 [inline]
 shmem_get_folio_gfp+0x7ce/0xd90 mm/shmem.c:2545
 shmem_get_folio mm/shmem.c:2651 [inline]
 shmem_write_begin+0xa2/0x180 mm/shmem.c:3301
 generic_perform_write+0x187/0x4a0 mm/filemap.c:4102
 shmem_file_write_iter+0xc2/0xe0 mm/shmem.c:3477
 __kernel_write_iter+0x247/0x4c0 fs/read_write.c:612
 dump_emit_page fs/coredump.c:885 [inline]
 dump_user_range+0x3c0/0x560 fs/coredump.c:946
 elf_core_dump+0x1d17/0x1ea0 fs/binfmt_elf.c:2129
 do_coredump+0x17fe/0x1f40 fs/coredump.c:759
 get_signal+0xd4f/0x1000 kernel/signal.c:3021
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 irqentry_exit_to_user_mode+0xa7/0x120 kernel/entry/common.c:231
 irqentry_exit+0x12/0x50 kernel/entry/common.c:334
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff888118440010 of 8 bytes by task 21018 on cpu 1:
 shmem_getattr+0x42/0x200 mm/shmem.c:1237
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr+0x172/0x1b0 fs/stat.c:246
 vfs_statx_path fs/stat.c:283 [inline]
 vfs_statx+0x12d/0x320 fs/stat.c:349
 vfs_fstatat+0xe4/0x130 fs/stat.c:368
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:526
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:526
 x64_sys_call+0x236d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000039eb -> 0x00000000000039ec

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 21018 Comm: syz-executor Tainted: G        W          6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================