From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7862C35E55D for ; Sat, 1 Aug 2026 00:34:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785544464; cv=none; b=l5vSi98JCjfGCiuQzsGmLqgKxRAVzuR1tSN7wIwZfnlcobSF2/4WSG3210aUKT23dVsURhwj9czIHGEZ7tj57Ta/4pHxhXovXpYjhxx7eB20TZCa+o8xcg0duyfHGnrsbZPyap2BrYQk/amegMhFiONBWR2LxsPE6LwNmQ1XHQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785544464; c=relaxed/simple; bh=/zaHcCgGz5t2HQnpgqloawVzBchVYg5tyTsVXCEF+iE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=UCh7BuV4VcdD1HeHqiwUXzmGzrDNv4RNGAg2YKzV+1axgjNHbfPFFrJeSmck92hRq1WfZMtysuHDBnc2F7mbessaCKI9utjRPFsxaiOfAeK9VQ2mENAhBL2tky1YosS4V1wExHvQB4Z4s56sqLSKp0evJ8eItCXY09pZ0ZZUEJU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.206 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f206.google.com with SMTP id 5614622812f47-4ab8b646492so2446340b6e.0 for ; Fri, 31 Jul 2026 17:34:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785544462; x=1786149262; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=axpXwigUc+Z08xCXKIS/WVAWHq4x2eFJq5Tjvkz1nEA=; b=LOWNwTpzvsYrjg+nRcuPmnFujrS5siB9c0UFswuLzGorVfYN8DYRwDZnkcOQmsESvZ H/v8cDLmXt5R8frH2F8BURkm2UFImdpFePSaR65AYryXtC6F5p8azzycr6FjBK6cerS/ Y3MzE+4P0ZY0rR5UGAh7wKZVvTSmfaL9+VaOY1AlqAbSOPom9D/zRDgbFNlU03XDSHqZ IyRok92iTA+wJnPJ+WHVWxoooScxviRKz3KOwfm81A8cCerXC2SHFYqylIJTWmECIBwA YRSAVM4c77Q9J4wadtQ8D1Uw4pXR8VQ4kqFB86sSdQWZC9JW/loo2gJx/lIILsWfIHuF AgcQ== X-Forwarded-Encrypted: i=1; AHgh+Rpjb2zedcrPI+qT/Vp/EqnG0VvyBThesbwwJQeqYmStxiG8zq0Gezq3E9uQIjCWtxJlBOda8mGpdzDAIXY=@vger.kernel.org X-Gm-Message-State: AOJu0Yzx+Maofeyv0lGw7VZuA5KixMRiXQCKM2luzdo6ctVKSsvptMAr QRo2eR4nypl0UN2ocIi+3sNY4v/gXoQtBS+h2XkQqcYVmwFLADf6I8HBifelERdJNnk2FtZ9gSM 3brYTYh5g/M/4WsowPvXn1bSQY9HzPyoF9kXWn/bYFStQYAht+mWc6SpV5TA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:198f:b0:4a3:26e5:cc02 with SMTP id 5614622812f47-4af5e20b8a9mr4154717b6e.10.1785544462388; Fri, 31 Jul 2026 17:34:22 -0700 (PDT) Date: Fri, 31 Jul 2026 17:34:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6d3f0e.f794c993.27aeb.000b.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in hpet_read From: syzbot To: arnd@arndb.de, clemens@ladisch.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3b5f4b83c4ab Merge tag 'for-7.2-rc5-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=166438c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=fc3a448093c17a792368 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3b5f4b83.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed6d6b480fd7/vmlinux-3b5f4b83.xz kernel image: https://storage.googleapis.com/syzbot-assets/d5a591a74024/bzImage-3b5f4b83.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fc3a448093c17a792368@syzkaller.appspotmail.com ------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] hpet_read+0x21b/0x6a0 drivers/char/hpet.c:285 WARNING: kernel/sched/core.c:9120 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9120, CPU#2: syz.1.801/8558 Modules linked in: CPU: 2 UID: 0 PID: 8558 Comm: syz.1.801 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP 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 0c 1a 50 0f 48 89 d1 <67> 48 0f b9 3a eb db e8 9d 34 a5 00 eb 9f 89 74 24 04 e8 c2 34 a5 RSP: 0018:ffffc90004597bc0 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: ffffffff8c5307a0 RCX: ffffffff85a8f43b RDX: ffffffff85a8f43b RSI: 0000000000000001 RDI: ffffffff9125ce30 RBP: 0000000000000135 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802a984a80 R13: 0000000000000000 R14: ffff88802d6bb880 R15: ffffed1005530c5e FS: 00007f9517ad76c0(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9517ad6ff8 CR3: 0000000041f16000 CR4: 0000000000352ef0 DR0: 0000000000000005 DR1: 0000000000000005 DR2: 0000000000040004 DR3: 000000000000000a DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __might_fault+0x8b/0x140 mm/memory.c:7290 hpet_read+0x56f/0x6a0 drivers/char/hpet.c:309 vfs_read+0x1e4/0xb40 fs/read_write.c:572 ksys_read+0x12a/0x250 fs/read_write.c:716 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: 0033:0x7f9516b9de99 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:00007f9517ad7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f9516e26090 RCX: 00007f9516b9de99 RDX: 0000000000002020 RSI: 0000200000000d40 RDI: 0000000000000005 RBP: 00007f9516c33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9516e26128 R14: 00007f9516e26090 R15: 00007ffc906d2838 ---------------- 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 0c 1a 50 0f lea 0xf501a0c(%rip),%rdi # 0xf501a33 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 9d 34 a5 00 call 0xa534d3 36: eb 9f jmp 0xffffffd7 38: 89 74 24 04 mov %esi,0x4(%rsp) 3c: e8 .byte 0xe8 3d: c2 34 a5 ret $0xa534 --- 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 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