syzbot

[EXT4 FS bs=4096, gc=1, bpg=71, ipg=32, mo=a80ec0a8, mo2=0000]
System zones: 0-2, 18-18, 34-34
EXT4-fs (loop5): 1 orphan inode deleted
ext4 filesystem being mounted at /root/syzkaller-testdir3473791171/syzkaller.cDqEEb/2416/file1 supports timestamps until 2038-01-19 (0x7fffffff)
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BUG: KCSAN: data-race in _copy_to_iter / copy_page_from_iter_atomic

read to 0xffff888156752c00 of 1024 bytes by task 14620 on cpu 1:
 instrument_copy_to_user include/linux/instrumented.h:113 [inline]
 copyout lib/iov_iter.c:167 [inline]
 _copy_to_iter+0x12b/0x950 lib/iov_iter.c:316
 copy_page_to_iter+0x171/0x2b0 lib/iov_iter.c:481
 copy_folio_to_iter include/linux/uio.h:185 [inline]
 filemap_read+0x424/0x680 mm/filemap.c:2706
 blkdev_read_iter+0x217/0x2c0 block/fops.c:734
 call_read_iter include/linux/fs.h:1979 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x3da/0x5c0 fs/read_write.c:470
 ksys_read+0xeb/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:621
 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

write to 0xffff888156752000 of 4096 bytes by task 5378 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+0x282/0xcf0 lib/iov_iter.c:590
 copy_folio_from_iter_atomic include/linux/uio.h:191 [inline]
 iomap_write_iter fs/iomap/buffered-io.c:920 [inline]
 iomap_file_buffered_write+0x383/0x570 fs/iomap/buffered-io.c:968
 blkdev_buffered_write block/fops.c:634 [inline]
 blkdev_write_iter+0x307/0x3e0 block/fops.c:688
 call_write_iter include/linux/fs.h:1985 [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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5378 Comm: syz-executor.5 Not tainted 6.5.0-syzkaller-08894-gb97d64c72259 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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