KCSAN: data-race in iput / writeback_single_inode (3)

Status: auto-closed as invalid on 2021/05/28 21:32
Subsystems: fs
[Documentation on labels]
First crash: 1949d, last: 1941d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in iput / writeback_single_inode ext4 6 1 2197d 2197d 0/29 auto-closed as invalid on 2020/09/15 05:18
upstream KCSAN: data-race in iput / writeback_single_inode (4) exfat 6 1 698d 698d 0/29 auto-obsoleted due to no activity on 2024/10/23 10:49
upstream KCSAN: data-race in iput / writeback_single_inode (2) ext4 6 1 2137d 2137d 0/29 auto-closed as invalid on 2020/11/13 23:11

Sample crash report:
==================================================================
BUG: KCSAN: data-race in iput / writeback_single_inode

write to 0xffff8881017a8b48 of 8 bytes by task 3063 on cpu 0:
 writeback_single_inode+0x143/0x590 fs/fs-writeback.c:1577
 write_inode_now+0x129/0x150 fs/fs-writeback.c:2607
 bdev_write_inode fs/block_dev.c:65 [inline]
 __blkdev_put+0x2cb/0x490 fs/block_dev.c:1586
 blkdev_put+0x23e/0x2c0 fs/block_dev.c:1645
 blkdev_close+0x47/0x50 fs/block_dev.c:1653
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881017a8b48 of 8 bytes by task 1789 on cpu 1:
 iput+0x2e/0x590 fs/inode.c:1670
 bdput fs/block_dev.c:963 [inline]
 blkdev_put_no_open fs/block_dev.c:1402 [inline]
 blkdev_put+0x292/0x2c0 fs/block_dev.c:1646
 kill_block_super+0x7b/0x90 fs/super.c:1397
 deactivate_locked_super+0x65/0xd0 fs/super.c:335
 deactivate_super+0x85/0x90 fs/super.c:366
 cleanup_mnt+0x277/0x2e0 fs/namespace.c:1136
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1143
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1789 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/23 21:26 upstream 18a3c5f7abfd 17f0b706 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in iput / writeback_single_inode
2021/04/22 19:09 upstream 16fc44d6387e 33c28d03 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in iput / writeback_single_inode
2021/04/22 09:47 upstream 16fc44d6387e 2bc8999a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in iput / writeback_single_inode
2021/04/16 01:40 upstream 7f75285ca572 c59079a6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in iput / writeback_single_inode
* Struck through repros no longer work on HEAD.