Internal error in sys_get_mempolicy

Status: upstream: reported C repro on 2025/08/13 05:43
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+7d8ad36a7434766dab0e@syzkaller.appspotmail.com
First crash: 380d, last: 46d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/08/22 linux-5.15.y (ToT) c79648372d02 C [report] Internal error in sys_get_mempolicy
2025/08/22 upstream (ToT) 3957a5720157 C Didn't crash
▶ ▼ Last patch testing requests (9)
Created Duration User Patch Repo Result
2026/07/13 06:39 18m retest repro linux-5.15.y report log
2026/06/20 11:21 16m retest repro linux-5.15.y report log
2026/04/16 17:21 10m retest repro linux-5.15.y report log
2026/03/25 07:06 13m retest repro linux-5.15.y report log
2026/02/05 16:27 11m retest repro linux-5.15.y report log
2026/01/13 20:27 10m retest repro linux-5.15.y report log
2025/11/27 13:10 12m retest repro linux-5.15.y report log
2025/11/04 06:36 11m retest repro linux-5.15.y report log
2025/09/17 13:19 14m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2026/06/01 18:01 59m fix candidate upstream error job log
2026/04/24 02:24 13m fix candidate upstream error job log
2026/03/24 17:23 1m fix candidate upstream error job log
2026/02/22 07:13 1m fix candidate upstream error job log
2026/01/22 23:33 1m fix candidate upstream error job log
2025/08/29 09:17 1h26m fix candidate upstream error job log

Sample crash report:
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4254 Comm: syz.0.17 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : kernel_get_mempolicy mm/mempolicy.c:1625 [inline]
pc : __do_sys_get_mempolicy mm/mempolicy.c:1638 [inline]
pc : __se_sys_get_mempolicy mm/mempolicy.c:1634 [inline]
pc : __arm64_sys_get_mempolicy+0x97c/0x1108 mm/mempolicy.c:1634
lr : kernel_get_mempolicy mm/mempolicy.c:1625 [inline]
lr : __do_sys_get_mempolicy mm/mempolicy.c:1638 [inline]
lr : __se_sys_get_mempolicy mm/mempolicy.c:1634 [inline]
lr : __arm64_sys_get_mempolicy+0x958/0x1108 mm/mempolicy.c:1634
sp : ffff80001fb17c60
x29: ffff80001fb17d20 x28: dfff800000000000 x27: ffff700003f62f90
x26: 0000000020ffe000 x25: 0000000000000000 x24: 00000020000f0000
x23: 0000000000000001 x22: 00000000fffffff2 x21: 00000000000069b4
x20: ffff0000d7de9b40 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80000880e704 x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000020000f00 x9 : 0000ffffffffffff
x8 : 0000000020000f00 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 kernel_get_mempolicy mm/mempolicy.c:1625 [inline]
 __do_sys_get_mempolicy mm/mempolicy.c:1638 [inline]
 __se_sys_get_mempolicy mm/mempolicy.c:1634 [inline]
 __arm64_sys_get_mempolicy+0x97c/0x1108 mm/mempolicy.c:1634
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f6 2a1f03e0 b8000959 (2a1603e1) 
---[ end trace 9a413d7f2adcf57c ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03f6 	mov	w22, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	b8000959 	sttr	w25, [x10]
* 10:	2a1603e1 	mov	w1, w22 <-- trapping instruction

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/18 04:50 linux-5.15.y c79648372d02 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/16 05:34 linux-5.15.y c79648372d02 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/28 07:48 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/28 07:47 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/27 13:36 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/26 15:00 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/26 14:58 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/26 14:56 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/26 14:54 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/25 07:53 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/18 04:09 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/16 05:14 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/16 05:14 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/13 05:42 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
2025/08/13 05:42 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_get_mempolicy
* Struck through repros no longer work on HEAD.