KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait

KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait_commit
Status: auto-closed as invalid on 2021/04/11 22:19
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 137d, last: 137d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait_commit

write to 0xffff88814485d000 of 8 bytes by task 4812 on cpu 0:
 jbd2_journal_commit_transaction+0x228/0x3290 fs/jbd2/commit.c:443
 kjournald2+0x263/0x480 fs/jbd2/journal.c:213
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88814485d000 of 8 bytes by task 10071 on cpu 1:
 is_journal_aborted include/linux/jbd2.h:1647 [inline]
 jbd2_log_wait_commit+0x1b8/0x200 fs/jbd2/journal.c:718
 jbd2_complete_transaction+0xf5/0x100 fs/jbd2/journal.c:846
 ext4_fc_commit+0x238/0x18d0 fs/ext4/fast_commit.c:1211
 ext4_fsync_journal fs/ext4/fsync.c:115 [inline]
 ext4_sync_file+0x336/0x6e0 fs/ext4/fsync.c:174
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2843 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:277
 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502
 call_write_iter include/linux/fs.h:1977 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10071 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #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	2021/03/07 22:18	upstream	144c79ef3353	09fbf400	.config	log	report			info	KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait_commit
ci2-upstream-kcsan-gce	2021/03/07 20:34	upstream	a38fd8748464	09fbf400	.config	log	report			info	KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait_commit