KCSAN: data-race in vm_area_dup / vma_interval_tree_insert_after

Status: auto-closed as invalid on 2020/04/29 02:18
Subsystems: mm
[Documentation on labels]
First crash: 2477d, last: 2370d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in vm_area_dup / vma_interval_tree_insert_after (2) mm 6 1 2274d 2274d 0/29 closed as invalid on 2020/06/18 14:13

Sample crash report:
==================================================================
BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert_after

write to 0xffff8881200f15e0 of 8 bytes by task 8468 on cpu 1:
 rb_link_node include/linux/rbtree.h:75 [inline]
 vma_interval_tree_insert_after+0x135/0x170 mm/interval_tree.c:56
 dup_mmap kernel/fork.c:576 [inline]
 dup_mm+0x53e/0xba0 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x39d7/0x3b40 kernel/fork.c:2081
 _do_fork+0xfe/0x7a0 kernel/fork.c:2430
 __do_sys_clone kernel/fork.c:2585 [inline]
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2566
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881200f1578 of 200 bytes by task 8463 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 dup_mmap kernel/fork.c:544 [inline]
 dup_mm+0x330/0xba0 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x39d7/0x3b40 kernel/fork.c:2081
 _do_fork+0xfe/0x7a0 kernel/fork.c:2430
 __do_sys_clone kernel/fork.c:2585 [inline]
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2566
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8463 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/02/19 02:11 https://github.com/google/ktsan.git kcsan b12d66a6c34f 135c18aa .config console log report ci2-upstream-kcsan-gce
2020/02/16 10:16 https://github.com/google/ktsan.git kcsan b12d66a6c34f cf914200 .config console log report ci2-upstream-kcsan-gce
2020/02/11 08:29 https://github.com/google/ktsan.git kcsan f60f0f543333 084454ae .config console log report ci2-upstream-kcsan-gce
2020/01/29 16:07 https://github.com/google/ktsan.git kcsan 245a43005292 5ed23f9a .config console log report ci2-upstream-kcsan-gce
2020/01/28 17:46 https://github.com/google/ktsan.git kcsan 245a43005292 c8e81ce4 .config console log report ci2-upstream-kcsan-gce
2020/01/23 15:28 https://github.com/google/ktsan.git kcsan 245a43005292 11ebf937 .config console log report ci2-upstream-kcsan-gce
2020/01/19 16:07 https://github.com/google/ktsan.git kcsan 245a43005292 0342f8c7 .config console log report ci2-upstream-kcsan-gce
2020/01/15 19:08 https://github.com/google/ktsan.git kcsan 245a43005292 f9b69507 .config console log report ci2-upstream-kcsan-gce
2019/12/28 12:45 https://github.com/google/ktsan.git kcsan 245a43005292 af6b8ef8 .config console log report ci2-upstream-kcsan-gce
2019/12/22 12:34 https://github.com/google/ktsan.git kcsan 245a43005292 8b967267 .config console log report ci2-upstream-kcsan-gce
2019/12/18 17:51 https://github.com/google/ktsan.git kcsan 245a43005292 79b211f7 .config console log report ci2-upstream-kcsan-gce
2019/12/12 05:21 https://github.com/google/ktsan.git kcsan ef798c30ba4e d973f528 .config console log report ci2-upstream-kcsan-gce
2019/12/09 15:00 https://github.com/google/ktsan.git kcsan ef798c30ba4e b31eda3d .config console log report ci2-upstream-kcsan-gce
2019/12/09 14:49 https://github.com/google/ktsan.git kcsan ef798c30ba4e b31eda3d .config console log report ci2-upstream-kcsan-gce
2019/12/06 02:07 https://github.com/google/ktsan.git kcsan ef798c30ba4e 98b4ef2d .config console log report ci2-upstream-kcsan-gce
2019/12/01 20:26 https://github.com/google/ktsan.git kcsan ef798c30ba4e f879db37 .config console log report ci2-upstream-kcsan-gce
2019/11/15 08:39 https://github.com/google/ktsan.git kcsan 5863cc791e4c 79248ee8 .config console log report ci2-upstream-kcsan-gce
2019/11/07 18:30 https://github.com/google/ktsan.git kcsan 94c006602e13 f39aff9e .config console log report ci2-upstream-kcsan-gce
2019/11/04 15:08 https://github.com/google/ktsan.git kcsan 94c006602e13 18e12644 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.