syzbot

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BUG: KCSAN: data-race in check_xattrs / copy_page_from_iter_atomic

write to 0xffff888140289000 of 4096 bytes by task 11194 on cpu 0:
 instrument_copy_from_user_before include/linux/instrumented.h:130 [inline]
 copyin lib/iov_iter.c:192 [inline]
 copy_page_from_iter_atomic+0x292/0xcf0 lib/iov_iter.c:581
 generic_perform_write+0x212/0x410 mm/filemap.c:3931
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018
 blkdev_write_iter+0x256/0x3c0 block/fops.c:573
 call_write_iter include/linux/fs.h:1877 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881402896bc of 4 bytes by task 11202 on cpu 1:
 check_xattrs+0x1ac/0x770 fs/ext4/xattr.c:227
 __xattr_check_inode fs/ext4/xattr.c:315 [inline]
 ext4_xattr_ibody_find+0x1a6/0x390 fs/ext4/xattr.c:2263
 ext4_find_inline_data_nolock+0xb9/0x1f0 fs/ext4/inline.c:157
 ext4_write_inline_data_end+0x1a2/0x7b0 fs/ext4/inline.c:771
 ext4_write_end+0x3f6/0x820 fs/ext4/inode.c:1274
 ext4_da_write_end+0xac/0x700 fs/ext4/inode.c:2952
 generic_perform_write+0x26d/0x410 mm/filemap.c:3934
 ext4_buffered_write_iter+0x1f6/0x370 fs/ext4/file.c:299
 ext4_file_write_iter+0x283/0x1230
 call_write_iter include/linux/fs.h:1877 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000704 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11202 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00030-gd4f8e13b0614 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
==================================================================
EXT4-fs error (device loop2): __ext4_get_inode_loc:4345: comm syz-executor.2: Invalid inode table block 0 in block_group 0
EXT4-fs error (device loop2) in ext4_reserve_inode_write:5718: Corrupt filesystem
EXT4-fs error (device loop2): ext4_dirty_inode:5922: inode #18: comm syz-executor.2: mark_inode_dirty error