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AHgh+RqGNdOqAExMB+EmEVuflqxDqIjhBK8Qr62FdfGmPwpy+1Juu9IDOHfxd3dm0F9jG4QRPRaWV+q1UaYjV+I=@vger.kernel.org X-Gm-Message-State: AFuF++l00B7T1OIg7kLK1yDkZeYhVdiWhdlaYmnlLjmCOD7xYcI10i0O GyMdIme0oMFFg6EoAeGPy81BaXJaDuxy70uKdFViR3ZrgoAAW/PZmmlTzOL8mA/AXm3+ofi4ROH g0DDlzMtb/5/EgksHDx8/4aXjET2LZPjZrdard9UGz05ubzMTuI8UlbDsny0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4f51:b0:4b3:1a95:4160 with SMTP id 5614622812f47-4b39830200emr1086896b6e.18.1787856760454; Thu, 27 Aug 2026 11:52:40 -0700 (PDT) Date: Thu, 27 Aug 2026 11:52:40 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a908778.1d9ded08.62e62.00dc.GAE@google.com> Subject: [syzbot] [kernel?] Internal error in futex_wake_op 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: 68f892e99df9 Merge branch 'for-next/core' into for-kernelci 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=13dc7415580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=417a6b7c02d5d03f9aa6 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=1512d625580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e2859e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f98dd20a7b98/disk-68f892e9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/441f1ad32549/vmlinux-68f892e9.xz kernel image: https://storage.googleapis.com/syzbot-assets/8da5227b7dc8/Image-68f892e9.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+417a6b7c02d5d03f9aa6@syzkaller.appspotmail.com futex_wake_op: syz.0.17 tries to shift op by 144; fix this program Internal error: synchronous external abort: 0000000096000010 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 4917 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_atomic_or arch/arm64/include/asm/futex.h:51 [inline] pc : __futex_atomic_or arch/arm64/include/asm/futex.h:239 [inline] pc : arch_futex_atomic_op_inuser arch/arm64/include/asm/futex.h:269 [inline] pc : futex_atomic_op_inuser kernel/futex/waitwake.c:251 [inline] pc : futex_wake_op+0x450/0xfe8 kernel/futex/waitwake.c:302 lr : mte_enable_tco arch/arm64/include/asm/mte-kasan.h:62 [inline] lr : uaccess_enable_privileged arch/arm64/include/asm/uaccess.h:147 [inline] lr : __llsc_futex_atomic_or arch/arm64/include/asm/futex.h:51 [inline] lr : __futex_atomic_or arch/arm64/include/asm/futex.h:239 [inline] lr : arch_futex_atomic_op_inuser arch/arm64/include/asm/futex.h:269 [inline] lr : futex_atomic_op_inuser kernel/futex/waitwake.c:251 [inline] lr : futex_wake_op+0x43c/0xfe8 kernel/futex/waitwake.c:302 sp : ffff800093197980 x29: ffff800093197b40 x28: 0000000000010000 x27: 0000000000000000 x26: 1fffe00018d2a3ad x25: dfff800000000000 x24: ffff0000c6951d40 x23: ffff0000c6951d6c x22: 0000000000000002 x21: 1fffe00018d2a685 x20: ffff0000c1df3780 x19: ffff0000c695342c x18: 0000000000000000 x17: 72676f7270207369 x16: 687420786966203b x15: 3434312079622070 x14: 6f20746669687320 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 00000000fffffff5 x9 : 0000000000000000 x8 : 0000000000000080 x7 : ffff80008048c60c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000805b0678 x2 : 0000000000000002 x1 : ffff0000c6951d40 x0 : 0000000000000000 Call trace: __llsc_futex_atomic_or arch/arm64/include/asm/futex.h:51 [inline] (P) __futex_atomic_or arch/arm64/include/asm/futex.h:239 [inline] (P) arch_futex_atomic_op_inuser arch/arm64/include/asm/futex.h:269 [inline] (P) futex_atomic_op_inuser kernel/futex/waitwake.c:251 [inline] (P) futex_wake_op+0x450/0xfe8 kernel/futex/waitwake.c:302 (P) do_futex+0x200/0x378 kernel/futex/syscalls.c:144 __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: d500409f 1280014a f94057eb f9800171 (885f7d76) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d500409f msr pan, #0x0 4: 1280014a mov w10, #0xfffffff5 // #-11 8: f94057eb ldr x11, [sp, #168] c: f9800171 prfm pstl1strm, [x11] * 10: 885f7d76 ldxr w22, [x11] <-- 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