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AHgh+Rq1i8rFR5/JqeWwxOgxnePIM4KLCKZuPmZ/dZM1wy8v+SmY79DZQ9mLP0EwNa+WD8w9ZD67Owz8zXtY7X0=@vger.kernel.org X-Gm-Message-State: AOJu0YzMRnj49wIya7wb4SP+kvhen79q6izAP7ggQ+g52DtLiXbydUNd t8ZCb3I4K2Z8g6ebPE7Uhw6WhIa2HlgeWzV8gqL1PW5ZwmqiK7lxqq/TMDgdOClRHQwqS7uQiiy rD2sTuHkOAP/4e65s9gac9Vpl3tXnIqEA0TUAZctlSrUnwsyTQDvM09cdJfQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1ca0:b0:6ac:a994:8794 with SMTP id 006d021491bc7-6ae96c3a350mr19304254eaf.7.1786302763600; Sun, 09 Aug 2026 12:12:43 -0700 (PDT) Date: Sun, 09 Aug 2026 12:12:43 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a78d12b.01d0871a.3a0d52.008d.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in futex_hash_allocate 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: 06cf61899d64 Merge tag 'x86-urgent-2026-08-08' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e07fb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=350a93852ac854927f45 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16e18079580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156bc2c6580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-06cf6189.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0e1bfee0387b/vmlinux-06cf6189.xz kernel image: https://storage.googleapis.com/syzbot-assets/c8ce37486654/bzImage-06cf6189.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+350a93852ac854927f45@syzkaller.appspotmail.com ------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=2 set at [] prepare_to_wait_event+0x8d/0x720 kernel/sched/wait.c:317 WARNING: kernel/sched/core.c:9120 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9120, CPU#0: syz.0.17/5928 Modules linked in: CPU: 0 UID: 0 PID: 5928 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__might_sleep+0x97/0xc0 kernel/sched/core.c:9120 Code: 8b 94 24 70 18 00 00 48 85 d2 75 14 48 83 c4 08 89 ee 48 89 df 31 d2 5b 5d 41 5c e9 33 fc ff ff 48 8d 3d 2c 23 4f 0f 48 89 d1 <67> 48 0f b9 3a eb db e8 5d 3d a5 00 eb 9f 89 74 24 04 e8 82 3d a5 RSP: 0018:ffffc900037efb88 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffffffff8bcfd700 RCX: ffffffff81e25edd RDX: ffffffff81e25edd RSI: 0000000000000002 RDI: ffffffff9124e750 RBP: 000000000000026f R08: ffffffff81fc6852 R09: 0000000000000000 R10: ffffc900037efd38 R11: 0000000000000000 R12: ffff88802b582540 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8e80ae80 FS: 00007efd31a166c0(0000) GS:ffff8880d5dec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd31a15ff8 CR3: 000000001c3ea000 CR4: 0000000000352ef0 Call Trace: __mutex_lock_common kernel/locking/mutex.c:623 [inline] __mutex_lock+0x10e/0x1bd0 kernel/locking/mutex.c:821 class_mutex_constructor include/linux/mutex.h:253 [inline] futex_pivot_pending kernel/futex/core.c:1789 [inline] futex_hash_allocate+0xd22/0x1120 kernel/futex/core.c:1872 futex_hash_prctl+0x1b8/0x390 kernel/futex/core.c:2027 __do_sys_prctl+0x16dd/0x2270 kernel/sys.c:2885 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efd30b9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efd31a16028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007efd30e25fa0 RCX: 00007efd30b9e0d9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007efd30c35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efd30e26038 R14: 00007efd30e25fa0 R15: 00007ffc8e6af968 ---------------- Code disassembly (best guess): 0: 8b 94 24 70 18 00 00 mov 0x1870(%rsp),%edx 7: 48 85 d2 test %rdx,%rdx a: 75 14 jne 0x20 c: 48 83 c4 08 add $0x8,%rsp 10: 89 ee mov %ebp,%esi 12: 48 89 df mov %rbx,%rdi 15: 31 d2 xor %edx,%edx 17: 5b pop %rbx 18: 5d pop %rbp 19: 41 5c pop %r12 1b: e9 33 fc ff ff jmp 0xfffffc53 20: 48 8d 3d 2c 23 4f 0f lea 0xf4f232c(%rip),%rdi # 0xf4f2353 27: 48 89 d1 mov %rdx,%rcx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb db jmp 0xc 31: e8 5d 3d a5 00 call 0xa53d93 36: eb 9f jmp 0xffffffd7 38: 89 74 24 04 mov %esi,0x4(%rsp) 3c: e8 .byte 0xe8 3d: 82 (bad) 3e: 3d .byte 0x3d 3f: a5 movsl %ds:(%rsi),%es:(%rdi) --- 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