syzbot


KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del (2)

Status: auto-closed as invalid on 2022/03/10 19:28
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 297d, last: 296d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del (3) 28 198d 202d 0/24 closed as invalid on 2022/05/13 11:20
upstream KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del 85 340d 354d 0/24 auto-closed as invalid on 2022/01/25 08:32

Sample crash report:
==================================================================
BUG: KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del

write to 0xffff88811fcce6ac of 4 bytes by task 7858 on cpu 1:
 ext4_orphan_del+0x579/0x730 fs/ext4/orphan.c:296
 ext4_handle_inode_extension fs/ext4/file.c:351 [inline]
 ext4_dio_write_iter fs/ext4/file.c:571 [inline]
 ext4_file_write_iter+0x1124/0x11f0 fs/ext4/file.c:675
 call_write_iter include/linux/fs.h:2074 [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 0xffff88811fcce6ac of 4 bytes by task 7863 on cpu 0:
 ext4_fill_raw_inode+0x2b4/0xea0 fs/ext4/inode.c:4298
 ext4_do_update_inode fs/ext4/inode.c:5083 [inline]
 ext4_mark_iloc_dirty+0x364/0x890 fs/ext4/inode.c:5677
 ext4_orphan_add+0x82e/0xa40 fs/ext4/orphan.c:168
 ext4_dio_write_iter fs/ext4/file.c:553 [inline]
 ext4_file_write_iter+0x9bf/0x11f0 fs/ext4/file.c:675
 call_write_iter include/linux/fs.h:2074 [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: 0x0000049e -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7863 Comm: syz-executor.1 Not tainted 5.17.0-rc2-syzkaller-00064-gc36c04c2e132 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/02/03 19:18 upstream c36c04c2e132 30646bfe .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
ci2-upstream-kcsan-gce 2022/02/03 08:04 upstream 88808fbbead4 4ebb2798 .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
ci2-upstream-kcsan-gce 2022/02/02 19:14 upstream 27bb0b18c208 4ebb2798 .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
ci2-upstream-kcsan-gce 2022/02/02 18:53 upstream 27bb0b18c208 4ebb2798 .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
ci2-upstream-kcsan-gce 2022/02/01 23:08 upstream 9f7fb8de5d9b 4ebb2798 .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
ci2-upstream-kcsan-gce 2022/02/01 21:22 upstream 9f7fb8de5d9b c1c1631d .config log report info KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del
* Struck through repros no longer work on HEAD.