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AKwUvBz/Lp887TwMOalwg0AB1XsvW3b1obQhl5K1vAmW7U1c6T4ilMKJXyeywelCzTZGv36+yqP/Q2WDGCwpBw0=@vger.kernel.org X-Gm-Message-State: AFuF++lL5pz49+GW/x6yvXIl1hZFbKm/094AF0LEaHQJ/1ResjJM2eVa cmh5DPGAuP2PHSM7nhRo8OA9sTqK/JLRaDMG9HmVFO4nWcWSuaMf0PuPInoka0KYiIWvDCxaIBL sDQI/2awfOzo5bLOlm5HV8d0dr4smZhW+P1pOSfQDzNcTlb4o4QV24Og0A1M= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:670f:b0:4d6:90d3:e18c with SMTP id 5614622812f47-4d72ea5ea92mr9088325b6e.53.1790426136099; Sat, 26 Sep 2026 05:35:36 -0700 (PDT) Date: Sat, 26 Sep 2026 05:35:36 -0700 In-Reply-To: <6a85402f.ae6ddae5.3da009.0007.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab7bc18.e548f532.1ca396.002d.GAE@google.com> Subject: Re: [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" syzbot has found a reproducer for the following issue on: HEAD commit: e8e60d3ddd25 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=13f66a05580000 kernel config: https://syzkaller.appspot.com/x/.config?x=375776a45e10c065 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 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=149b92c9580000 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 1163001896 out of range WARNING: lib/vsprintf.c:2654 at set_field_width lib/vsprintf.c:2654 [inline], CPU#1: syz-executor257/5017 WARNING: lib/vsprintf.c:2654 at vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2918, CPU#1: syz-executor257/5017 Modules linked in: CPU: 1 UID: 0 PID: 5017 Comm: syz-executor257 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : set_field_width lib/vsprintf.c:2654 [inline] pc : vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2918 lr : set_field_width lib/vsprintf.c:2654 [inline] lr : vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2918 sp : ffff8000950d6b10 x29: ffff8000950d6b60 x28: 00000000007fffff x27: ffff8000873d6422 x26: 0000000045520028 x25: ffff8000950d6bd8 x24: 0000000000000402 x23: ffff8000950d6f18 x22: ffff800087abd600 x21: ffff8000950d6bf0 x20: ffff8000950d6ecb x19: dfff800000000000 x18: 0000000000000000 x17: ffff8000839f990c x16: ffff800083a13a68 x15: 0000fffff4c1bf60 x14: 0000000000000747 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000002 x9 : a322e52aa42a7400 x8 : a322e52aa42a7400 x7 : ffff8000804823d8 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000802f3e90 x2 : 0000000100000000 x1 : ffff0000d38bd880 x0 : 0000000000000000 Call trace: set_field_width lib/vsprintf.c:2654 [inline] (P) vsnprintf+0xb9c/0xd10 lib/vsprintf.c:2918 (P) va_format lib/vsprintf.c:1725 [inline] pointer+0x5e8/0x6b4 lib/vsprintf.c:2577 vsnprintf+0x618/0xd10 lib/vsprintf.c:2953 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:5000 dev_printk_emit+0xe0/0x130 drivers/base/core.c:5011 __dynamic_dev_dbg+0x1b4/0x254 lib/dynamic_debug.c:904 dtv_property_process_get+0x26bc/0x2838 drivers/media/dvb-core/dvb_frontend.c:1595 dvb_get_property drivers/media/dvb-core/dvb_frontend.c:2397 [inline] dvb_frontend_handle_ioctl+0x1644/0x2424 drivers/media/dvb-core/dvb_frontend.c:2478 dvb_frontend_do_ioctl+0x124/0x278 drivers/media/dvb-core/dvb_frontend.c:2101 dvb_usercopy+0x2a4/0x4d4 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x68/0x8c drivers/media/dvb-core/dvb_frontend.c:2115 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+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 irq event stamp: 7442 hardirqs last enabled at (7441): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (7441): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 hardirqs last disabled at (7442): [] vprintk_store+0x13c/0xb94 kernel/printk/printk.c:2287 softirqs last enabled at (7400): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (7400): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (7400): [] do_sve_acc+0x32c/0x4b8 arch/arm64/kernel/fpsimd.c:1332 softirqs last disabled at (7398): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (7398): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (7398): [] do_sve_acc+0x10c/0x4b8 arch/arm64/kernel/fpsimd.c:1308 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: slab-out-of-bounds in hex_st --- 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.