syzbot


KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers (3)

Status: closed as invalid on 2022/05/13 11:20
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 211d, last: 210d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers (2) 1 352d 352d 0/24 auto-closed as invalid on 2022/01/23 07:11
upstream KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers 1 391d 391d 0/24 auto-closed as invalid on 2021/12/15 14:34

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers

read-write to 0xffff8881358ed8b0 of 8 bytes by task 10669 on cpu 1:
 __filemap_add_folio+0x2d9/0x7f0 mm/filemap.c:904
 filemap_add_folio+0x6b/0x150 mm/filemap.c:959
 page_cache_ra_unbounded+0x19e/0x2e0 mm/readahead.c:243
 do_page_cache_ra mm/readahead.c:291 [inline]
 page_cache_ra_order mm/readahead.c:546 [inline]
 ondemand_readahead+0x5df/0x780 mm/readahead.c:668
 page_cache_sync_ra+0x1a4/0x1b0 mm/readahead.c:695
 page_cache_sync_readahead include/linux/pagemap.h:1185 [inline]
 filemap_get_pages mm/filemap.c:2592 [inline]
 filemap_read+0x3e5/0x1400 mm/filemap.c:2679
 generic_file_read_iter+0x72/0x320 mm/filemap.c:2825
 ext4_file_read_iter+0x1e9/0x2a0
 call_read_iter include/linux/fs.h:2044 [inline]
 generic_file_splice_read+0x1de/0x2c0 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2ac/0x660 fs/splice.c:870
 do_splice_direct+0xfb/0x180 fs/splice.c:979
 do_sendfile+0x3ad/0x900 fs/read_write.c:1246
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64 fs/read_write.c:1297 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881358ed8b0 of 8 bytes by task 1405 on cpu 0:
 jbd2_journal_submit_inode_data_buffers+0x56/0xf0 fs/jbd2/commit.c:195
 ext4_journal_submit_inode_data_buffers+0x53/0x140 fs/ext4/super.c:549
 journal_submit_data_buffers+0xf0/0x260 fs/jbd2/commit.c:256
 jbd2_journal_commit_transaction+0x764/0x3180 fs/jbd2/commit.c:580
 kjournald2+0x253/0x460 fs/jbd2/journal.c:213
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000145 -> 0x000000000000014c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1405 Comm: jbd2/sda1-8 Not tainted 5.18.0-rc6-syzkaller-00007-g9be9ed2612b5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/05/09 21:06 upstream 9be9ed2612b5 8b277b8e .config log report info KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers
ci2-upstream-kcsan-gce 2022/05/09 10:53 upstream c5eb0a61238d 8b277b8e .config log report info KCSAN: data-race in __filemap_add_folio / jbd2_journal_submit_inode_data_buffers
* Struck through repros no longer work on HEAD.