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Sun, 16 Aug 2026 20:34:24 -0700 In-Reply-To: <6a7135a9.d35e88fd.de8b.0004.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a828140.10853dc7.22f513.0018.GAE@google.com> Subject: Re: [syzbot] [media?] WARNING in as102_stream_ctrl From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@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: dcb68831eac7 Merge tag 'block-7.2-20260815' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15a356c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2ca5f2f2c4197664 dashboard link: https://syzkaller.appspot.com/bug?extid=ea047a32630b1f47da67 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144afa79580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=128fc679580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ce324780f4da/disk-dcb68831.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/54b24f8a899c/vmlinux-dcb68831.xz kernel image: https://storage.googleapis.com/syzbot-assets/733dcdb8d8dd/bzImage-dcb68831.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ea047a32630b1f47da67@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#1: syz.2.149/6139 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12d8/0x1550 kernel/locking/mutex.c:821, CPU#1: syz.2.149/6139 Modules linked in: CPU: 1 UID: 0 PID: 6139 Comm: syz.2.149 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x12df/0x1550 kernel/locking/mutex.c:821 Code: c2 57 90 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d 45 d0 83 04 00 75 13 48 8d 3d c8 1f 87 04 48 c7 c6 40 f7 ec 8b <67> 48 0f b9 3a 90 e9 75 ee ff ff 90 0f 0b 90 e9 48 f2 ff ff 90 0f RSP: 0000:ffffc9000381f5c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8880321a0000 RDX: 0000000000000000 RSI: ffffffff8becf740 RDI: ffffffff905b11d0 RBP: ffffc9000381f758 R08: ffffffff9057c243 R09: 1ffffffff20af848 R10: dffffc0000000000 R11: fffffbfff20af849 R12: ffff88803476a010 R13: 0000000000000000 R14: 1ffff92000703ecc R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125049000(0063) knlGS:0000000057754480 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f741be8c CR3: 000000007d7a2000 CR4: 00000000003526f0 Call Trace: as102_stream_ctrl+0x27/0xc0 drivers/media/usb/as102/as102_drv.c:259 dvb_frontend_open+0x7e2/0x1410 drivers/media/dvb-core/dvb_frontend.c:2825 dvb_device_open+0x24f/0x340 drivers/media/dvb-core/dvbdev.c:109 chrdev_open+0x4d9/0x600 fs/char_dev.c:411 do_dentry_open+0x816/0x1380 fs/open.c:947 vfs_open+0x3b/0x340 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2e44/0x3830 fs/namei.c:4863 do_file_open+0x23e/0x4a0 fs/namei.c:4892 do_sys_openat2+0x115/0x200 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_compat_sys_openat fs/open.c:1436 [inline] __se_compat_sys_openat fs/open.c:1434 [inline] __ia32_compat_sys_openat+0x131/0x160 fs/open.c:1434 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] do_int80_emulation+0x19a/0x550 arch/x86/entry/syscall_32.c:172 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:598 RIP: 0023:0xf71374eb Code: 57 56 53 8b 44 24 14 f6 00 08 75 23 8b 44 24 18 8b 5c 24 1c 8b 4c 24 20 8b 54 24 24 8b 74 24 28 8b 7c 24 2c 8b 6c 24 30 cd 80 <5b> 5e 5f 5d c3 5b 5e 5f 5d e9 f7 a1 ff ff 66 90 66 90 66 90 90 53 RSP: 002b:00000000ff9eefcc EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000ff9ef090 RDX: 0000000000000802 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: c2 57 90 ret $0x9057 3: 48 c1 e8 03 shr $0x3,%rax 7: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax b: 84 c0 test %al,%al d: 0f 85 47 02 00 00 jne 0x25a 13: 83 3d 45 d0 83 04 00 cmpl $0x0,0x483d045(%rip) # 0x483d05f 1a: 75 13 jne 0x2f 1c: 48 8d 3d c8 1f 87 04 lea 0x4871fc8(%rip),%rdi # 0x4871feb 23: 48 c7 c6 40 f7 ec 8b mov $0xffffffff8becf740,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 75 ee ff ff jmp 0xffffeeaa 35: 90 nop 36: 0f 0b ud2 38: 90 nop 39: e9 48 f2 ff ff jmp 0xfffff286 3e: 90 nop 3f: 0f .byte 0xf --- 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.