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BUG: KCSAN: data-race in shmem_getpage_gfp / shmem_write_end

write to 0xffff888139cd91a0 of 8 bytes by task 17191 on cpu 1:
 i_size_write include/linux/fs.h:886 [inline]
 shmem_write_end+0x59/0x380 mm/shmem.c:2535
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3749
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3866
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3898
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:578
 ksys_pwrite64 fs/read_write.c:693 [inline]
 __do_sys_pwrite64 fs/read_write.c:703 [inline]
 __se_sys_pwrite64 fs/read_write.c:700 [inline]
 __x64_sys_pwrite64+0xf5/0x150 fs/read_write.c:700
 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+0x63/0xcd

read to 0xffff888139cd91a0 of 8 bytes by task 17196 on cpu 0:
 i_size_read include/linux/fs.h:864 [inline]
 shmem_getpage_gfp+0x1a3/0x1750 mm/shmem.c:1854
 shmem_getpage mm/shmem.c:150 [inline]
 shmem_file_read_iter+0x161/0x6c0 mm/shmem.c:2592
 __kernel_read+0x1ac/0x3e0 fs/read_write.c:428
 kernel_read+0xaa/0x160 fs/read_write.c:446
 kernel_read_file+0x38a/0x510 fs/kernel_read_file.c:93
 kernel_read_file_from_fd+0xab/0xf0 fs/kernel_read_file.c:184
 __do_sys_finit_module kernel/module/main.c:2941 [inline]
 __se_sys_finit_module+0xdf/0x180 kernel/module/main.c:2923
 __x64_sys_finit_module+0x3f/0x50 kernel/module/main.c:2923
 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+0x63/0xcd

value changed: 0x0000000000a2c000 -> 0x0000000000a31000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17196 Comm: syz-executor.5 Not tainted 6.0.0-rc3-syzkaller-00007-gdcf8e5633e2e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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Invalid ELF header magic: != ELF