syzbot


KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (3)

Status: auto-closed as invalid on 2020/12/01 12:40
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 690d, last: 650d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (5) 1 507d 507d 0/23 auto-closed as invalid on 2021/04/23 13:27
upstream KCSAN: data-race in __mark_inode_dirty / ext4_sync_file 1 807d 807d 0/23 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (2) 1 746d 746d 0/23 auto-closed as invalid on 2020/08/27 02:47
upstream KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (4) 5 547d 607d 0/23 auto-closed as invalid on 2021/03/14 09:37

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / ext4_sync_file

write to 0xffff88800b6c26b8 of 8 bytes by task 7265 on cpu 0:
 __mark_inode_dirty+0x212/0x740 fs/fs-writeback.c:2290
 generic_update_time fs/inode.c:1764 [inline]
 update_time fs/inode.c:1777 [inline]
 touch_atime+0x157/0x1a0 fs/inode.c:1848
 file_accessed include/linux/fs.h:2204 [inline]
 generic_file_buffered_read+0x1a1c/0x2110 mm/filemap.c:2458
 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: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 0xffff88800b6c26b8 of 8 bytes by task 7266 on cpu 1:
 ext4_fsync_nojournal fs/ext4/fsync.c:87 [inline]
 ext4_sync_file+0x266/0x6a0 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2723 [inline]
 iomap_dio_complete+0x2c4/0x3a0 fs/iomap/direct-io.c:127
 iomap_dio_rw+0x4e/0x70 fs/iomap/direct-io.c:608
 ext4_dio_write_iter fs/ext4/file.c:552 [inline]
 ext4_file_write_iter+0xe06/0x1090 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7266 Comm: syz-executor.1 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2020/10/27 12:37 upstream 4525c8781ec0 94942294 .config log report info
ci2-upstream-kcsan-gce 2020/10/12 19:13 upstream 1e6d1d96461e d32b0bbf .config log report info
ci2-upstream-kcsan-gce 2020/09/19 20:37 upstream eb5f95f1593f 53ce8104 .config log report info
ci2-upstream-kcsan-gce 2020/09/17 01:09 upstream 5925fa68fe82 77507d02 .config log report info