syzbot


KCSAN: data-race in __delete_from_page_cache / iomap_dio_complete

Status: auto-closed as invalid on 2022/01/01 01:39
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 375d, last: 375d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __delete_from_page_cache / iomap_dio_complete

write to 0xffff88813906a340 of 8 bytes by task 21702 on cpu 1:
 page_cache_delete mm/filemap.c:146 [inline]
 __delete_from_page_cache+0x1e1/0x2c0 mm/filemap.c:231
 invalidate_complete_page2 mm/truncate.c:586 [inline]
 invalidate_inode_pages2_range+0x4d8/0x7c0 mm/truncate.c:677
 __iomap_dio_rw+0x5d2/0x1070 fs/iomap/direct-io.c:570
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xac3/0x1200 fs/ext4/file.c:679
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813906a340 of 8 bytes by task 21795 on cpu 0:
 iomap_dio_complete+0x32e/0x3e0 fs/iomap/direct-io.c:101
 iomap_dio_rw+0x56/0x80 fs/iomap/direct-io.c:682
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xac3/0x1200 fs/ext4/file.c:679
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000031 -> 0x0000000000000029

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21795 Comm: syz-executor.0 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/11/27 01:35 upstream c5c17547b778 63eeac02 .config log report info KCSAN: data-race in __delete_from_page_cache / iomap_dio_complete
* Struck through repros no longer work on HEAD.