From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (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 E1FC533D6D5 for ; Tue, 11 Nov 2025 20:25:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762892731; cv=none; b=ZON1oHeZTRgCheMIwTnTN3IbcIAjpLGYhRcpmR8okvcv2+zMOtfPnjV1bJMc4K+4+dS8UEJRZR/y2lZhq5w4tjqv2CCh1kEjr54hcKLIZD52KNRyLT1gm12pyi+hych7/ZPBumqcKajMLYaQ9u4Qwy/wGn5hHrfD6p1PSZ/IfaI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762892731; c=relaxed/simple; bh=G21k23XPzM7ZfXXWaoVqydqXPou23iahOffp0woaw4w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=lZ5HDnKNDL5R6db5K+3Z5LesEv/eBdsnO9ezZ7EbnvA7iiReh4D2oXCsfbMQTSXoW872nRr7rVw/nPj6FX6NP2wsyvhwOdQkNp0nNwfiRxug/dRk16qPOAsaJ7hmrv34SKhgzlTYiWtzdDBma3azw917kp6NnxtFU2VbfGTlua4= 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=209.85.166.205 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-il1-f205.google.com with SMTP id e9e14a558f8ab-433689014feso1417385ab.1 for ; Tue, 11 Nov 2025 12:25:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762892729; x=1763497529; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=cJkFoSRs8okndB0NF+WpPovtnW03gk5UHbHwEREFNng=; b=ATUQBkROIXxSu6j5+JfIQn+bR7RXD2ZlsMfU3s2OLtL0j1WlnUheZ7331s2Rl/GX02 HAy84kgjInoK2QSVthT2hnhPdjRfEBVVPmBy4LB8U/wEKc6x3wxhWm7RbJGuRPe9Wu3L hCtdo+8GFOeB6ozbtLNq8Q4/5dv6feIzZ3vcwRzzt1KklCe5kG5SvAYTYTjOjZmassPa SUBc9eQL6aPJdvHC7+EPFO3I5fj4XiC4dQ/8u1Azv/pPyCH7tkBUnCQrAHVey8SotupL H7QAIhI5Bc6kYCcZA3B6SsAkN7A68LsMoUyQZA5q0SBmq+wVhjcbsvM/dWZcwYxSpP1B BPJw== X-Forwarded-Encrypted: i=1; AJvYcCXxISS7gEf4Y5lemnnNLe/vgFNe7H1vtBdtd1zPcdXZ+YoO4qFUS/s1MQ51iqvV4lrForoIuBDA7x1GWWc=@vger.kernel.org X-Gm-Message-State: AOJu0YxyPCjDJM6T++VixZ7IsLcMzeZGtzpmFiVr4z13uSSFWzI1Ritl PTqKmHgw731KL8Abf3GTZiIoNpgwdkHXWQ3wEHQQ4FMiUycjuQjuihCijTfCBN0p+CaP1JqeoPH Wxf21xeNs4ejNoVKjTI+nNxVv+5zksFJc2I7pHoYM/iH/zXxNook5wZTVxCI= X-Google-Smtp-Source: AGHT+IE57QnP1Vs+yJMpX9ldQWcn5HAda5L26waD+epriwGTu5HuGfk0y33jAEuhEL/M3mr1UhZ6/3KppppFA4yr6gR+Z3oG1zU+ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:370e:b0:433:7885:6105 with SMTP id e9e14a558f8ab-43473d6b887mr6996185ab.15.1762892729015; Tue, 11 Nov 2025 12:25:29 -0800 (PST) Date: Tue, 11 Nov 2025 12:25:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69139bb9.a70a0220.22f260.014b.GAE@google.com> Subject: [syzbot] [mm?] general protection fault in __rt_mutex_slowlock_locked From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4a0c9b339199 Merge tag 'probes-fixes-v6.18-rc4' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136e9114580000 kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833 dashboard link: https://syzkaller.appspot.com/bug?extid=60f8f8d9d0a992e59f1a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2f1bc58f2850/disk-4a0c9b33.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d4d546567b38/vmlinux-4a0c9b33.xz kernel image: https://storage.googleapis.com/syzbot-assets/4618744dea2b/bzImage-4a0c9b33.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+60f8f8d9d0a992e59f1a@syzkaller.appspotmail.com loop2: detected capacity change from 0 to 32768 Oops: general protection fault, probably for non-canonical address 0xdffffc00e0000153: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x0000000700000a98-0x0000000700000a9f] CPU: 0 UID: 0 PID: 13777 Comm: syz.2.923 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90004b4f2f0 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffffffff8ac3ee8e RCX: 8a8d6ce156f8e600 RDX: 0000000000000000 RSI: ffffffff8ac3ee8e RDI: 00000000e0000153 RBP: ffffffff819ba5a3 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100a608c91 R12: 0000000000000000 R13: 0000000700000a98 R14: 0000000700000a98 R15: 0000000000000001 FS: 00007f6cb050e6c0(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31923ffc CR3: 0000000068aae000 CR4: 00000000003526f0 Call Trace: __kasan_check_byte+0x12/0x40 mm/kasan/common.c:579 kasan_check_byte include/linux/kasan.h:401 [inline] lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 task_blocks_on_rt_mutex kernel/locking/rtmutex.c:1265 [inline] __rt_mutex_slowlock kernel/locking/rtmutex.c:1719 [inline] __rt_mutex_slowlock_locked+0x1223/0x25e0 kernel/locking/rtmutex.c:1760 rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline] rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244 i_mmap_lock_write include/linux/fs.h:548 [inline] vma_link_file mm/vma.c:1781 [inline] __mmap_new_vma mm/vma.c:2499 [inline] __mmap_region mm/vma.c:2670 [inline] mmap_region+0x1bf4/0x20f0 mm/vma.c:2740 do_mmap+0xc23/0x10c0 mm/mmap.c:558 vm_mmap_pgoff+0x2a9/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x4e9/0x720 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6cb22af6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6cb050e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f6cb2505fa0 RCX: 00007f6cb22af6c9 RDX: 00000000027ffff7 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007f6cb2331f91 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000004012011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6cb2506038 R14: 00007f6cb2505fa0 R15: 00007ffebcf391b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90004b4f2f0 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffffffff8ac3ee8e RCX: 8a8d6ce156f8e600 RDX: 0000000000000000 RSI: ffffffff8ac3ee8e RDI: 00000000e0000153 RBP: ffffffff819ba5a3 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100a608c91 R12: 0000000000000000 R13: 0000000700000a98 R14: 0000000700000a98 R15: 0000000000000001 FS: 00007f6cb050e6c0(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31923ffc CR3: 0000000068aae000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 0f 1f 40 d6 nopl -0x2a(%rax) 1c: 48 c1 ef 03 shr $0x3,%rdi 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction 2e: 3c 08 cmp $0x8,%al 30: 0f 92 c0 setb %al 33: c3 ret 34: cc int3 35: cc int3 36: cc int3 37: cc int3 38: cc int3 39: 66 data16 3a: 66 data16 3b: 66 data16 3c: 66 data16 3d: 66 data16 3e: 66 data16 3f: 2e cs --- 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