Hello,
syzbot found the following issue on:
HEAD commit: 407ab579 Merge tag 'for-linus' of git://
git.kernel.org/pub..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=1549be1a500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=671e27f23e60a67b
dashboard link:
https://syzkaller.appspot.com/bug?extid=745a40728c2f32a454b6
compiler: clang version 12.0.0 (
https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [
adilger...@dilger.ca linux...@vger.kernel.org linux-...@vger.kernel.org ty...@mit.edu]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+745a40...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
write to 0xffff88813805e250 of 8 bytes by task 588 on cpu 1:
i_size_write include/linux/fs.h:871 [inline]
ext4_update_inode_size fs/ext4/ext4.h:3259 [inline]
ext4_handle_inode_extension+0x226/0x550 fs/ext4/file.c:332
ext4_dio_write_iter fs/ext4/file.c:558 [inline]
ext4_file_write_iter+0xe48/0x1090 fs/ext4/file.c:662
call_write_iter include/linux/fs.h:1887 [inline]
do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
do_iter_write+0x112/0x4b0 fs/read_write.c:866
vfs_iter_write+0x4c/0x70 fs/read_write.c:907
iter_file_splice_write+0x42a/0x780 fs/splice.c:686
do_splice_from fs/splice.c:764 [inline]
direct_splice_actor+0x80/0xa0 fs/splice.c:933
splice_direct_to_actor+0x345/0x650 fs/splice.c:888
do_splice_direct+0xf5/0x170 fs/splice.c:976
do_sendfile+0x574/0xb70 fs/read_write.c:1257
__do_sys_sendfile64 fs/read_write.c:1318 [inline]
__se_sys_sendfile64 fs/read_write.c:1304 [inline]
__x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff88813805e250 of 8 bytes by task 592 on cpu 0:
i_size_read include/linux/fs.h:849 [inline]
generic_file_buffered_read+0x13df/0x2110 mm/filemap.c:2294
generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2535
ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74
call_read_iter include/linux/fs.h:1881 [inline]
generic_file_splice_read+0x22a/0x310 fs/splice.c:311
do_splice_to fs/splice.c:788 [inline]
splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
do_splice_direct+0xf5/0x170 fs/splice.c:976
do_sendfile+0x574/0xb70 fs/read_write.c:1257
__do_sys_sendfile64 fs/read_write.c:1312 [inline]
__se_sys_sendfile64 fs/read_write.c:1304 [inline]
__x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 592 Comm: syz-executor.2 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
---
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