Hello,
syzbot found the following issue on:
HEAD commit: 7eac66d0 Merge tag 'vfio-v5.9-rc2' of git://
github.com/awi..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=16b498a9900000
kernel config:
https://syzkaller.appspot.com/x/.config?x=fc203b6744fb74a
dashboard link:
https://syzkaller.appspot.com/bug?extid=75c8f278444ac898e162
compiler: clang version 11.0.0 (
https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
CC: [
ak...@linux-foundation.org linux-...@vger.kernel.org linu...@kvack.org]
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+75c8f2...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in ondemand_readahead / ondemand_readahead
write to 0xffff8881216768a0 of 4 bytes by task 6214 on cpu 1:
ondemand_readahead+0x2ab/0x6e0 mm/readahead.c:530
page_cache_sync_readahead+0x178/0x1a0 mm/readahead.c:585
generic_file_buffered_read+0x2ec/0x1f60 mm/filemap.c:2101
generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2405
ext4_file_read_iter+0x2d8/0x420 fs/ext4/file.c:74
call_read_iter include/linux/fs.h:1876 [inline]
generic_file_splice_read+0x22b/0x310 fs/splice.c:312
do_splice_to fs/splice.c:870 [inline]
splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950
do_splice_direct+0xf2/0x170 fs/splice.c:1059
do_sendfile+0x56a/0xba0 fs/read_write.c:1540
__do_sys_sendfile64 fs/read_write.c:1601 [inline]
__se_sys_sendfile64 fs/read_write.c:1587 [inline]
__x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff8881216768a0 of 4 bytes by task 6203 on cpu 0:
ondemand_readahead+0x136/0x6e0 mm/readahead.c:467
page_cache_sync_readahead+0x178/0x1a0 mm/readahead.c:585
generic_file_buffered_read+0x2ec/0x1f60 mm/filemap.c:2101
generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2405
ext4_file_read_iter+0x2d8/0x420 fs/ext4/file.c:74
call_read_iter include/linux/fs.h:1876 [inline]
generic_file_splice_read+0x22b/0x310 fs/splice.c:312
do_splice_to fs/splice.c:870 [inline]
splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950
do_splice_direct+0xf2/0x170 fs/splice.c:1059
do_sendfile+0x56a/0xba0 fs/read_write.c:1540
__do_sys_sendfile64 fs/read_write.c:1601 [inline]
__se_sys_sendfile64 fs/read_write.c:1587 [inline]
__x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587
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: 6203 Comm: syz-executor.0 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
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