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Mon, 10 Aug 2026 22:42:25 -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: <6a7ab641.b50370da.49fe0.0062.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: 3d08ff75a47a Add linux-next specific files for 20260810 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fdca9e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5ba0556605934602 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b01079580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/227afac921c2/disk-3d08ff75.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/236f7cfe0ac3/vmlinux-3d08ff75.xz kernel image: https://storage.googleapis.com/syzbot-assets/aea89831fd96/bzImage-3d08ff75.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.3.80/6275 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12d8/0x1550 kernel/locking/mutex.c:821, CPU#1: syz.3.80/6275 Modules linked in: CPU: 1 UID: 0 PID: 6275 Comm: syz.3.80 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: 2e 59 90 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d 05 ad 7c 04 00 75 13 48 8d 3d 18 a8 7f 04 48 c7 c6 e0 11 ed 8b <67> 48 0f b9 3a 90 e9 75 ee ff ff 90 0f 0b 90 e9 48 f2 ff ff 90 0f RSP: 0018:ffffc90003e5f680 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807f5d1f40 RDX: 0000000000000000 RSI: ffffffff8bed11e0 RDI: ffffffff905c29a0 RBP: ffffc90003e5f820 R08: ffffffff90592e83 R09: 1ffffffff20b25d0 R10: dffffc0000000000 R11: fffffbfff20b25d1 R12: ffff888078e08010 R13: 0000000000000000 R14: 1ffff920007cbee4 R15: 0000000000000000 FS: 000055556341e500(0000) GS:ffff88812500d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc7f45eb7c0 CR3: 00000000324b2000 CR4: 00000000003526f0 Call Trace: as102_stream_ctrl+0x27/0xc0 drivers/media/usb/as102/as102_drv.c:259 __dvb_frontend_open+0x2e9/0xc40 drivers/media/dvb-core/dvb_frontend.c:2772 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:996 vfs_open+0x3b/0x340 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1443/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbe1bf5e90e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffd8f0c6fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055556341e500 RCX: 00007fbe1bf5e90e RDX: 0000000000000802 RSI: 00007ffd8f0c70c0 RDI: ffffffffffffff9c RBP: 00007ffd8f0c70c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007fbe1c225fac R14: 00007fbe1c225fa0 R15: 00007fbe1c225fa0 ---------------- Code disassembly (best guess): 0: 2e 59 cs pop %rcx 2: 90 nop 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 05 ad 7c 04 00 cmpl $0x0,0x47cad05(%rip) # 0x47cad1f 1a: 75 13 jne 0x2f 1c: 48 8d 3d 18 a8 7f 04 lea 0x47fa818(%rip),%rdi # 0x47fa83b 23: 48 c7 c6 e0 11 ed 8b mov $0xffffffff8bed11e0,%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.