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KCSAN: data-race in __ext4_update_other_inode_time / iput (2)

Status: auto-closed as invalid on 2021/02/13 05:04
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+b8d0ddf36fbf69a1e066@syzkaller.appspotmail.com
First crash: 1272d, last: 1164d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __ext4_update_other_inode_time / iput (3) ext4 1 1105d 1105d 0/26 auto-closed as invalid on 2021/04/14 01:56
upstream KCSAN: data-race in __ext4_update_other_inode_time / iput ext4 5 1309d 1360d 0/26 auto-closed as invalid on 2020/09/21 07:31

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __ext4_update_other_inode_time / iput

write to 0xffff88801491a678 of 8 bytes by task 31983 on cpu 0:
 __ext4_update_other_inode_time+0xc1/0x550 fs/ext4/inode.c:4975
 ext4_update_other_inodes_time fs/ext4/inode.c:5011 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5140 [inline]
 ext4_mark_iloc_dirty+0x1286/0x1650 fs/ext4/inode.c:5721
 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5915
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828
 __ext4_new_inode+0x2a90/0x3060 fs/ext4/ialloc.c:1326
 ext4_symlink+0x2bc/0x780 fs/ext4/namei.c:3330
 vfs_symlink+0x216/0x2d0 fs/namei.c:3962
 do_symlinkat+0xee/0x280 fs/namei.c:3989
 __do_sys_symlink fs/namei.c:4008 [inline]
 __se_sys_symlink fs/namei.c:4006 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4006
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801491a678 of 8 bytes by task 8473 on cpu 1:
 iput+0x2e/0x510 fs/inode.c:1669
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3905
 __do_sys_unlink fs/namei.c:3945 [inline]
 __se_sys_unlink fs/namei.c:3943 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943
 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: 8473 Comm: syz-executor.1 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/09 05:03 upstream 6279d812eab6 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/08 04:01 upstream f5e6c330254a c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2020/12/30 05:05 upstream 139711f033f6 0fa352f2 .config console log report info ci2-upstream-kcsan-gce
2020/12/27 21:46 upstream f838f8d2b694 2242f77f .config console log report info ci2-upstream-kcsan-gce
2020/12/23 05:51 upstream 614cb5894306 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/13 19:49 upstream 6bff9bb8a292 8f160dd5 .config console log report info ci2-upstream-kcsan-gce
2020/12/12 01:35 upstream 7f376f1917d7 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/11/18 14:32 upstream 0fa8ee0d9ab9 09323409 .config console log report info ci2-upstream-kcsan-gce
2020/11/10 11:15 upstream 407ab579637c cca87986 .config console log report info ci2-upstream-kcsan-gce
2020/11/03 15:45 upstream b7cbaf59f62f cba33199 .config console log report info ci2-upstream-kcsan-gce
2020/10/31 16:56 upstream 5fc6b075e165 8bc4594f .config console log report info ci2-upstream-kcsan-gce
2020/10/23 23:52 upstream 0adc313c4f20 2bb6666c .config console log report info ci2-upstream-kcsan-gce
2020/10/13 21:27 upstream 6ad4bf6ea160 fc7735a2 .config console log report info ci2-upstream-kcsan-gce
2020/09/27 20:26 upstream a1bffa48745a 5dd8aee8 .config console log report info ci2-upstream-kcsan-gce
2020/09/24 01:49 upstream c9c9e6a49f89 54289b08 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.