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AKwUvByWQ3OGZfiJQBNdpHoBalhhNnINtXktlyNeFgg8CwVg0bWtGbF58VPKb40fJKVkNMe5Nr0mghmY9H/l8ic=@vger.kernel.org X-Gm-Message-State: AFuF++l29VeFg1KVDQT4bki4rbXrTRLNCOYkwevD0D8Kinit2iZ3b37r TxEr55meZuENk+yPYGP12rwOYck9n1ay0wh2ct4GJUMHiKDTAP7U8o09TQO3GT5RjqoWqmV5feI MF34qOGsUv+9H+RNtW1CmmGMIZIo655i7ZWKPUMISRWbt9WrbgxxdB4ka+9s= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2007:b0:6b5:ec2f:356e with SMTP id 006d021491bc7-6b5ec2f3676mr14259111eaf.31.1788905371100; Tue, 08 Sep 2026 15:09:31 -0700 (PDT) Date: Tue, 08 Sep 2026 15:09:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa0879b.f81106d8.285f0a.0006.GAE@google.com> Subject: [syzbot] [kernel?] Internal error in futex_cmpxchg_value_locked From: syzbot To: andrealmeid@igalia.com, dave@stgolabs.net, dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5445d6419962 arm64: Don't read GMID_EL1 when MTE is disabled git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=16f87125580000 kernel config: https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c dashboard link: https://syzkaller.appspot.com/bug?extid=635d160c0d4133481520 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f87125580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107f3af9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e8b70e3bd109/disk-5445d641.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e5227e56ac93/vmlinux-5445d641.xz kernel image: https://storage.googleapis.com/syzbot-assets/54905f78be59/Image-5445d641.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+635d160c0d4133481520@syzkaller.appspotmail.com Internal error: synchronous external abort: 0000000096000010 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 4916 Comm: syz.0.17 Tainted: G M syzkaller #0 PREEMPT Tainted: [M]=MACHINE_CHECK Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83000005 (Nzcv daif -PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline] pc : __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline] pc : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline] pc : futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295 lr : access_ok arch/arm64/include/asm/uaccess.h:45 [inline] lr : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:290 [inline] lr : futex_cmpxchg_value_locked+0xc8/0x394 kernel/futex/futex.h:295 sp : ffff80009ab17750 x29: ffff80009ab17770 x28: 1fffe000189dc765 x27: ffff0000c4ee3b2c x26: 1fffe000189dca44 x25: dfff800000000000 x24: 0000000000000000 x23: 0000000000000000 x22: 000000008f0101ff x21: 000000000f0101ff x20: 000ffffffffffffd x19: ffff0000c4ee5224 x18: 0000000000000000 x17: ffff8000805acb44 x16: ffff8000805ac7e0 x15: ffff8000805b05f8 x14: ffff8000805aea98 x13: 0000000000000009 x12: 0000000000000000 x11: 0000000072c79ec1 x10: 0000000000000080 x9 : 00000000fffffff5 x8 : 0000000000000000 x7 : ffff800080375350 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000805b145c x2 : 0000000000000000 x1 : ffff0000c4ee3b00 x0 : 0000000000000000 Call trace: __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline] (P) __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline] (P) futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline] (P) futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295 (P) lock_pi_update_atomic+0x58/0xd4 kernel/futex/pi.c:549 futex_lock_pi_atomic+0x28c/0x898 kernel/futex/pi.c:666 futex_lock_pi+0x248/0x6e0 kernel/futex/pi.c:1018 do_futex+0x2f8/0x378 kernel/futex/syscalls.c:-1 __do_sys_futex kernel/futex/syscalls.c:210 [inline] __se_sys_futex kernel/futex/syscalls.c:191 [inline] __arm64_sys_futex+0x2e4/0x418 kernel/futex/syscalls.c:191 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Code: 2a1f03e0 12800149 d500409f f9800111 (885f7d14) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 2a1f03e0 mov w0, wzr 4: 12800149 mov w9, #0xfffffff5 // #-11 8: d500409f msr pan, #0x0 c: f9800111 prfm pstl1strm, [x8] * 10: 885f7d14 ldxr w20, [x8] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup