From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 DB17B1B4138 for ; Wed, 19 Aug 2026 05:33:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787117618; cv=none; b=MoAFDMiVsaWNshw1HnQOhgcbbFwxx8yEBlzFHNmo5tM/BeLDdfWnYACpE+CoPFusRYX2nkOFDUMW9HJzyrysnYRo1vPQsq9GpYnpqBqsOf4tcWT80eG62OnW/SeeSnAIa5LRrYgy9BWEuNFnBa3dxhhpO8Ylfy0/dbWODNQvA+Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787117618; c=relaxed/simple; bh=nGqXBd1ywz5ZLyuuV9/4d1dqIgNBrOa+76aUutPPE+w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=DZ12ZH8iztwVEjLrgBJxQoYqjjKhUz7EbLhO1AO9gba+1E32w+sVCtrPGwe7wa04GJCQ+nv7+1Inj4TLtpfwvpgqtYALyRzbJ1gH1MC1algpGzKUX40MCIoNj24PvImqzWZHpTUjQ/qa8sHdNGgqc/KtPDyAA1lmb7i12pagw1k= 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=209.85.167.208 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-f208.google.com with SMTP id 5614622812f47-4a4a7d0362eso814462b6e.0 for ; Tue, 18 Aug 2026 22:33:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787117616; x=1787722416; 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=1HCqqJw9VawZ7gbI3jsAGuJwceVNHIhpFH05MwRM+4U=; b=OMeStbUDcxY0WUU0et3gens/LDC7oOHsJNquJUCODdKrsqcGoISSaPGO8Cc0nSGIb1 716VGXPAHdkaHHeGjPMqEneAEV1F9nrUeEfiJEaRkA9iFOCchJOPr2u3WkcVXXKDFG48 dELiVjZd48GsoHFhQDhw3YH5ag4Nm0UaQyW87vUNN7g+DYG6glBWOlau4XY6+mRdPI/2 Gl4tbCiNWp4e6SjWSYRyWKolVmAhfWAxYUbxFGCWk8GdWBMm98QeNbivfsP3zo+fCeBV i5OSB1HU5IAkYBYJxN7BLSp8debmfNemvPXTjVndTYNyfcCBsMr/wRP7ShDLJB3f3V3k fDeg== X-Forwarded-Encrypted: i=1; AHgh+RphMmdYP+52Ijb7zIc4Y+uqiGPPnaeDbF+jcw0FWY5rN9TFPraBJlvHDmUlc35mn7vQr88QNUHl7d6sJTA=@vger.kernel.org X-Gm-Message-State: AOJu0Yzkicu7yiO/H9I/Cn1VrHbRBZCUQGjF6BvKJ2n8SKmpGjWfG9+0 Hvj1hVgu4Krea6sbuDZfUqn3IniXaM6bkSGACDNLlj8tDH9eXjJfYnFIWREOiUT8RONsjxtawRU EJBWYwV1d6PGKoU3oW4NnKWiF4c7mfxWMm10a7Y2Uuam8mNTjjDR7YRhg5E0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:178b:b0:4a4:ba4a:9ac4 with SMTP id 5614622812f47-4b2bcabf503mr1698588b6e.13.1787117615788; Tue, 18 Aug 2026 22:33:35 -0700 (PDT) Date: Tue, 18 Aug 2026 22:33:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a85402f.ae6ddae5.3da009.0007.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in __dynamic_dev_dbg From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 21d6ac051080 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=1022e279580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=6102f1c3a0ea8073fd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/88380e2ddcb9/disk-21d6ac05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5dba5c2896b7/vmlinux-21d6ac05.xz kernel image: https://storage.googleapis.com/syzbot-assets/52ac739e37e0/Image-21d6ac05.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6102f1c3a0ea8073fd64@syzkaller.appspotmail.com ------------[ cut here ]------------ field width 67108864 out of range WARNING: lib/vsprintf.c:2650 at set_field_width lib/vsprintf.c:2650 [inline], CPU#0: syz.6.1148/9267 WARNING: lib/vsprintf.c:2650 at vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2914, CPU#0: syz.6.1148/9267 Modules linked in: CPU: 0 UID: 0 PID: 9267 Comm: syz.6.1148 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : set_field_width lib/vsprintf.c:2650 [inline] pc : vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2914 lr : set_field_width lib/vsprintf.c:2650 [inline] lr : vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2914 sp : ffff8000946e6b10 x29: ffff8000946e6b60 x28: 00000000007fffff x27: ffff800087471e82 x26: 0000000004000000 x25: ffff8000946e6bd8 x24: 0000000000000402 x23: ffff8000946e6f18 x22: ffff800087b3ed00 x21: ffff8000946e6bf0 x20: ffff8000946e6ecb x19: dfff800000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000020000040 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : d2e0bfbdf6510800 x8 : d2e0bfbdf6510800 x7 : ffff80008048c5b8 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000802f6830 x2 : 0000000100000000 x1 : ffff0000f664d7c0 x0 : 0000000000000001 Call trace: set_field_width lib/vsprintf.c:2650 [inline] (P) vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2914 (P) va_format lib/vsprintf.c:1725 [inline] pointer+0x5e8/0x6b4 lib/vsprintf.c:2573 vsnprintf+0x618/0xd10 lib/vsprintf.c:2949 vprintk_store+0x344/0xb94 kernel/printk/printk.c:2307 vprintk_emit+0x1bc/0x514 kernel/printk/printk.c:2455 dev_vprintk_emit+0x2ec/0x3b4 drivers/base/core.c:4996 dev_printk_emit+0xe0/0x130 drivers/base/core.c:5007 __dynamic_dev_dbg+0x1b4/0x254 lib/dynamic_debug.c:904 dtv_property_process_get+0x26bc/0x2838 drivers/media/dvb-core/dvb_frontend.c:1594 dvb_get_property drivers/media/dvb-core/dvb_frontend.c:2396 [inline] dvb_frontend_handle_ioctl+0x1644/0x2424 drivers/media/dvb-core/dvb_frontend.c:2477 dvb_frontend_do_ioctl+0x124/0x278 drivers/media/dvb-core/dvb_frontend.c:2100 dvb_usercopy+0x2a4/0x4d4 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x68/0x8c drivers/media/dvb-core/dvb_frontend.c:2114 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583 __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 irq event stamp: 150 hardirqs last enabled at (149): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (149): [] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (150): [] vprintk_store+0x13c/0xb94 kernel/printk/printk.c:2287 softirqs last enabled at (114): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (114): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (114): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (112): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (112): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (112): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 ---[ end trace 0000000000000000 ]--- --- 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