syzbot


KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers (2)

Status: auto-closed as invalid on 2022/01/10 19:46
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 402d, last: 356d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers (3) 1 298d 298d 0/24 auto-closed as invalid on 2022/03/10 12:04
upstream KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers 2 653d 659d 0/24 auto-closed as invalid on 2021/03/20 13:35

Sample crash report:
==================================================================
BUG: KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers

write to 0xffff88813ea2ecf8 of 8 bytes by task 5168 on cpu 1:
 jbd2_journal_file_inode+0x17a/0x330
 jbd2_journal_inode_ranged_write+0x30/0x40 fs/jbd2/transaction.c:2705
 ext4_jbd2_inode_add_write fs/ext4/ext4_jbd2.h:424 [inline]
 ext4_map_blocks+0xdce/0xf00 fs/ext4/inode.c:739
 ext4_iomap_alloc fs/ext4/inode.c:3365 [inline]
 ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3415
 iomap_iter+0x395/0x4a0 fs/iomap/iter.c:74
 __iomap_dio_rw+0xb78/0x1070 fs/iomap/direct-io.c:588
 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 0xffff88813ea2ecf8 of 8 bytes by task 1402 on cpu 0:
 jbd2_journal_finish_inode_data_buffers+0x3d/0x60 fs/jbd2/commit.c:276
 ext4_journal_finish_inode_data_buffers+0x41/0x60 fs/ext4/super.c:541
 journal_finish_inode_data_buffers fs/jbd2/commit.c:299 [inline]
 jbd2_journal_commit_transaction+0x16a8/0x3460 fs/jbd2/commit.c:786
 kjournald2+0x263/0x480 fs/jbd2/journal.c:213
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000089fff -> 0x000000000008afff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1402 Comm: jbd2/sda1-8 Tainted: G        W         5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/12/06 19:42 upstream 0fcfb00b28c0 579a8754 .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/12/06 03:49 upstream 944207047ca4 a617004c .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/11/26 01:12 upstream b501b85957de 63eeac02 .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/11/15 09:56 upstream ce49bfc8d037 75b04091 .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/11/09 07:34 upstream e851dfae4371 8ab17e57 .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/11/08 06:21 upstream 6b75d88fa81b 4c1be0be .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
ci2-upstream-kcsan-gce 2021/10/21 19:16 upstream 2f111a6fd5b5 55f90bc6 .config log report info KCSAN: data-race in jbd2_journal_file_inode / jbd2_journal_finish_inode_data_buffers
* Struck through repros no longer work on HEAD.