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kernel BUG in vma_replace_policy

Status: upstream: reported C repro on 2023/09/06 01:03
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+b591856e0f0139f83023@syzkaller.appspotmail.com
Fix commit: mm: lock VMAs skipped by a failed queue_pages_range()
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 1028d, last: 1015d
Cause bisection: introduced by (bisect log) :
commit 49b0638502da097c15d46cd4e871dbaa022caf7c
Author: Suren Baghdasaryan <surenb@google.com>
Date: Fri Aug 4 15:27:19 2023 +0000

  mm: enable page walking API to lock vmas during the walk

Crash: kernel BUG in vma_replace_policy (log)
Repro: C syz .config
  
▶ ▼ ✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision Error
51f2c280-b8a9-4fd7-9dcb-459b59771e3f assessment-security 💥 kernel BUG in vma_replace_policy 2026/06/18 03:02 2026/06/18 03:02 2026/06/18 03:19 b62b3ded1759f79b37600c5ffe2b0a81b919b0b0 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8e98d3467a2b36f93a...
truncated to first 200 bytes; open job for full error
8b6be994-28f7-406e-882b-6714e6eb09ae assessment-security 💥 kernel BUG in vma_replace_policy 2026/06/09 23:08 2026/06/09 23:08 2026/06/09 23:30 c36c07f6c1f2230a36374cbd22235f635e8f9284 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8e98d3467a2b36f93a...
truncated to first 200 bytes; open job for full error
2bbac678-39aa-49ca-83ba-a45c901c937a assessment-security 💥 kernel BUG in vma_replace_policy 2026/06/04 00:39 2026/06/04 00:39 2026/06/04 00:52 62fe15281f5011cd203d8845b8767b10e7443aa5 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8e98d3467a2b36f93a...
truncated to first 200 bytes; open job for full error
79ac9994-aef1-4301-9477-b1a65f83d192 assessment-security 💥 kernel BUG in vma_replace_policy 2026/06/01 06:14 2026/06/01 06:14 2026/06/01 06:26 6b4a844333e83556da95d61d7f207e7ef5cd4bc6 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8e98d3467a2b36f93a...
truncated to first 200 bytes; open job for full error
c947aa7a-addb-4345-95e1-c8ca6b8522d7 assessment-security 💥 kernel BUG in vma_replace_policy 2026/05/15 10:27 2026/05/15 10:27 2026/05/15 10:28 9cd3beaadf14b3a22d15fd97a0bf081ee41ebe01 
failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128
From /app/workdir/repo/linux
 * branch                HEAD       -> FETCH_HEAD
error: unable to ...
truncated to first 200 bytes; open job for full error
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH 1/1] mm: lock VMAs skipped by a failed queue_pages_range() 4 (4) 2023/09/19 21:09
[syzbot] [mm?] kernel BUG in vma_replace_policy 23 (26) 2023/09/19 00:34
[PATCH] mm: as the same logic with queue_pages_range 5 (5) 2023/09/14 05:53
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2023/09/14 04:56 24m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git a47fc304d2b6 OK log
2023/09/14 02:06 36m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git a47fc304d2b6 report log
2023/09/12 05:30 35m willy@infradead.org patch upstream OK log
2023/09/09 03:42 33m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log
2023/09/06 04:16 22m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git a47fc304d2b6 OK log
2023/09/06 02:58 6m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git a47fc304d2b6 error
2023/09/06 02:47 24m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git a47fc304d2b6 OK log

Sample crash report:
vma ffff88806ea68600 start 0000000020c2a000 end 0000000021000000 mm ffff888025458000
prot 25 anon_vma 0000000000000000 vm_ops 0000000000000000
pgoff 20c2a file 0000000000000000 private_data 0000000000000000
flags: 0x8100077(read|write|exec|mayread|maywrite|mayexec|account|softdirty)
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:733!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5036 Comm: syz-executor178 Not tainted 6.5.0-syzkaller-11812-g7733171926cc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:vma_assert_write_locked include/linux/mm.h:733 [inline]
RIP: 0010:vma_assert_write_locked include/linux/mm.h:729 [inline]
RIP: 0010:vma_replace_policy+0x406/0x4e0 mm/mempolicy.c:783
Code: ff 48 89 ef e8 db 78 ff ff e9 83 fe ff ff e8 f1 7c ad ff 4c 89 e7 e8 d9 87 eb ff 0f 0b e8 e2 7c ad ff 48 89 df e8 2a 85 eb ff <0f> 0b e8 d3 7c ad ff 41 89 ec e9 58 fe ff ff 48 c7 c7 50 2d ce 8e
RSP: 0018:ffffc90003a6fc58 EFLAGS: 00010282
RAX: 000000000000011b RBX: ffff88806ea68600 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff816b5c72 RDI: 0000000000000005
RBP: ffff88806ea71000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000015
R13: 0000000000000016 R14: 0000000000000001 R15: 0000000021000000
FS:  0000555556197380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055982602f6f8 CR3: 000000006ead6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mbind_range+0x37c/0x530 mm/mempolicy.c:855
 do_mbind+0x583/0xa00 mm/mempolicy.c:1345
 kernel_mbind+0x1d4/0x1f0 mm/mempolicy.c:1502
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f87f90d8369
Code: 48 83 c4 28 c3 e8 37 17 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:00007ffd6da77898 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007ffd6da77a78 RCX: 00007f87f90d8369
RDX: 0000000000000004 RSI: 0000000000c00000 RDI: 0000000020400000
RBP: 00007f87f914b610 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd6da77a68 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vma_assert_write_locked include/linux/mm.h:733 [inline]
RIP: 0010:vma_assert_write_locked include/linux/mm.h:729 [inline]
RIP: 0010:vma_replace_policy+0x406/0x4e0 mm/mempolicy.c:783
Code: ff 48 89 ef e8 db 78 ff ff e9 83 fe ff ff e8 f1 7c ad ff 4c 89 e7 e8 d9 87 eb ff 0f 0b e8 e2 7c ad ff 48 89 df e8 2a 85 eb ff <0f> 0b e8 d3 7c ad ff 41 89 ec e9 58 fe ff ff 48 c7 c7 50 2d ce 8e
RSP: 0018:ffffc90003a6fc58 EFLAGS: 00010282
RAX: 000000000000011b RBX: ffff88806ea68600 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff816b5c72 RDI: 0000000000000005
RBP: ffff88806ea71000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000015
R13: 0000000000000016 R14: 0000000000000001 R15: 0000000021000000
FS:  0000555556197380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055982602f6f8 CR3: 000000006ead6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/06 06:24 upstream 7733171926cc 8bc9053e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in vma_replace_policy
2023/09/02 01:17 linux-next a47fc304d2b6 696ea0d2 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in vma_replace_policy
2023/09/14 23:13 upstream 9fdfb15a3dbf 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in vma_replace_policy
2023/09/09 04:35 upstream a48fa7efaf11 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in vma_replace_policy
2023/09/03 08:47 upstream 92901222f83d 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in vma_replace_policy
2023/09/02 00:54 linux-next a47fc304d2b6 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in vma_replace_policy
* Struck through repros no longer work on HEAD.