kernel BUG in mmap_region

Status: upstream: reported C repro on 2023/06/11 16:08
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+af3fbbcc17d7f34395be@syzkaller.appspotmail.com
First crash: 1147d, last: 22h26m
Cause bisection: introduced by (bisect log) :
commit 2f5f352e6ab38f361d615b0ca691ccc69d094818
Author: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Thu May 18 14:55:44 2023 +0000

  FROMGIT: BACKPORT: mm: avoid rewalk in mmap_region

Crash: kernel BUG in mmap_region (log)
Repro: C syz .config
  
Bug presence (3)
Date Name Commit Repro Result
2023/09/28 android14-6.1 (ToT) c240f4ed0054 C [report] kernel BUG in mmap_region
2023/09/28 lts (merge base) b1644a0031cf C Didn't crash
2023/09/28 upstream (ToT) 633b47cb009d C Didn't crash
Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/01/07 03:58 12m retest repro android14-6.1 report log
2026/01/07 03:58 11m retest repro android14-6.1 report log
2026/01/07 03:58 12m retest repro android14-6.1 report log
2026/01/07 03:58 6m retest repro android14-6.1 report log
2025/12/03 12:21 6m retest repro android14-6.1 report log
2025/11/11 00:56 12m retest repro android14-6.1 report log
2025/10/24 06:57 6m retest repro android14-6.1 report log
2025/10/24 06:57 11m retest repro android14-6.1 report log
2025/10/24 06:57 14m retest repro android14-6.1 report log
2025/10/24 06:57 7m retest repro android14-6.1 report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/07/13 05:36 1h17m bisect fix android14-6.1 OK (0) job log log
2024/05/20 17:50 39m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000200000b15000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000200000b15000
R13: 00007fffe88b3758 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
------------[ cut here ]------------
kernel BUG at mm/mmap.c:2829!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 289 Comm: syz-executor408 Not tainted 6.1.134-syzkaller-00012-g646380b087a5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:__mmap_region mm/mmap.c:2829 [inline]
RIP: 0010:mmap_region+0x1ffd/0x2140 mm/mmap.c:3005
Code: 80 c1 03 38 c1 0f 8c f8 f9 ff ff 4c 89 f7 49 89 d5 e8 67 11 09 00 4c 89 ea e9 e5 f9 ff ff e8 5a be c4 ff 0f 0b e8 53 be c4 ff <0f> 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 6a fb ff ff 48 89 df e8
RSP: 0018:ffffc90000eb7a60 EFLAGS: 00010293
RAX: ffffffff81ab287d RBX: 0000200000b18000 RCX: ffff88810e110000
RDX: 0000000000000000 RSI: 0000200000b17fff RDI: 0000200000b18000
RBP: ffffc90000eb7c50 R08: ffff88810e110000 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000200000b18000
R13: 0000200000b17fff R14: dffffc0000000000 R15: ffff888121d7b700
FS:  00005555716e3380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000126628000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_mmap+0x7ae/0xcf0 mm/mmap.c:1474
 vm_mmap_pgoff+0x1f5/0x3f0 mm/util.c:525
 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1520
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86
 x64_sys_call+0x8fd/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7e5d295329
Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe88b3568 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fffe88b3580 RCX: 00007f7e5d295329
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000200000b15000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000200000b15000
R13: 00007fffe88b3758 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mmap_region mm/mmap.c:2829 [inline]
RIP: 0010:mmap_region+0x1ffd/0x2140 mm/mmap.c:3005
Code: 80 c1 03 38 c1 0f 8c f8 f9 ff ff 4c 89 f7 49 89 d5 e8 67 11 09 00 4c 89 ea e9 e5 f9 ff ff e8 5a be c4 ff 0f 0b e8 53 be c4 ff <0f> 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 6a fb ff ff 48 89 df e8
RSP: 0018:ffffc90000eb7a60 EFLAGS: 00010293
RAX: ffffffff81ab287d RBX: 0000200000b18000 RCX: ffff88810e110000
RDX: 0000000000000000 RSI: 0000200000b17fff RDI: 0000200000b18000
RBP: ffffc90000eb7c50 R08: ffff88810e110000 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000200000b18000
R13: 0000200000b17fff R14: dffffc0000000000 R15: ffff888121d7b700
FS:  00005555716e3380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000126628000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (265):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/13 07:33 android14-6.1 646380b087a5 f6671af7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2025/01/12 08:58 android14-6.1 770852bf7d99 6dbc6a9b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2024/09/02 14:52 android14-6.1 b5e374dda921 1eda0d14 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in mmap_region
2024/01/18 18:08 android14-6.1 899194d7e909 239abf84 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2023/09/28 11:04 android14-6.1 c240f4ed0054 c2ab1e5d .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2023/06/11 15:57 android14-6.1 7641ff0a300a 49519f06 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 19:46 android14-6.1 92668decd5e0 aae9036b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/04/03 07:37 android14-6.1 b5e515a3e6a7 4440e7c2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/31 22:15 android14-6.1 92668decd5e0 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/31 17:56 android14-6.1 92668decd5e0 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/31 16:05 android14-6.1 92668decd5e0 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/31 00:50 android14-6.1 92668decd5e0 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 15:59 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 15:55 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 12:55 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 11:33 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 09:37 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/30 08:09 android14-6.1 92668decd5e0 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/29 15:27 android14-6.1 92668decd5e0 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/29 09:55 android14-6.1 92668decd5e0 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/29 00:54 android14-6.1 92668decd5e0 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/28 22:47 android14-6.1 92668decd5e0 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/28 16:38 android14-6.1 92668decd5e0 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/28 15:00 android14-6.1 92668decd5e0 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/28 03:37 android14-6.1 92668decd5e0 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/28 02:59 android14-6.1 92668decd5e0 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 17:10 android14-6.1 92668decd5e0 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 12:15 android14-6.1 92668decd5e0 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 10:14 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 08:07 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/27 06:55 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/26 23:38 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/26 03:41 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/25 08:09 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/25 06:50 android14-6.1 92668decd5e0 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/24 16:43 android14-6.1 92668decd5e0 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/24 08:57 android14-6.1 92668decd5e0 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/22 18:04 android14-6.1 92668decd5e0 4a865b71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/22 07:19 android14-6.1 72b456bf57ad b561ce9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/21 15:46 android14-6.1 72b456bf57ad 7c5de9c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/20 19:44 android14-6.1 72b456bf57ad de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/17 10:59 android14-6.1 c7e15f0bdc49 7f27c57a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/17 09:48 android14-6.1 c7e15f0bdc49 7f27c57a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/16 20:59 android14-6.1 8824f345abdb 71b49442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/16 09:39 android14-6.1 8824f345abdb 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/11 09:24 android14-6.1 21b931853e8d d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/11 07:52 android14-6.1 21b931853e8d d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/10 16:06 android14-6.1 52939c41021c 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/09 17:05 android14-6.1 52939c41021c a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/09 00:26 android14-6.1 52939c41021c b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/08 17:34 android14-6.1 52939c41021c 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/08 05:01 android14-6.1 52939c41021c 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/07 17:32 android14-6.1 88b53eb10b7d 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
2026/07/07 15:51 android14-6.1 88b53eb10b7d 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in mmap_region
* Struck through repros no longer work on HEAD.