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Wed, 25 Mar 2026 22:13:24 -0700 (PDT) Date: Wed, 25 Mar 2026 22:13:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69c4c074.a70a0220.23629d.0008.GAE@google.com> Subject: [syzbot] [media?] WARNING in as102_dvb_dmx_start_feed 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" Hello, syzbot found the following issue on: HEAD commit: bbeb83d3182a Merge tag 'kbuild-fixes-7.0-3' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136f4772580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91 dashboard link: https://syzkaller.appspot.com/bug?extid=3825a6102073c418fe41 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176e7af6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16754b52580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dbd3eaf2f899/disk-bbeb83d3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/45838a797bcf/vmlinux-bbeb83d3.xz kernel image: https://storage.googleapis.com/syzbot-assets/ba91cdcacfe1/bzImage-bbeb83d3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3825a6102073c418fe41@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:593 at __mutex_lock_common kernel/locking/mutex.c:593 [inline], CPU#1: syz.2.23/6152 WARNING: kernel/locking/mutex.c:593 at __mutex_lock+0x10a4/0x1300 kernel/locking/mutex.c:776, CPU#1: syz.2.23/6152 Modules linked in: CPU: 1 UID: 0 PID: 6152 Comm: syz.2.23 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:593 [inline] RIP: 0010:__mutex_lock+0x10ab/0x1300 kernel/locking/mutex.c:776 Code: 11 90 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 33 02 00 00 83 3d d9 a1 61 04 00 75 13 48 8d 3d 1c b7 64 04 48 c7 c6 c0 e0 cc 8b <67> 48 0f b9 3a 90 e9 ac f0 ff ff 90 0f 0b 90 e9 73 f4 ff ff 90 0f RSP: 0018:ffffc90003917a20 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92000722f5c RCX: ffff88807c728000 RDX: 0000000000000000 RSI: ffffffff8bcce0c0 RDI: ffffffff9014fc10 RBP: ffffc90003917bd8 R08: ffffffff9011e6c3 R09: 1ffffffff2023cd8 R10: dffffc0000000000 R11: fffffbfff2023cd9 R12: ffff88807e2e2b60 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00005555608ec500(0000) GS:ffff88812555d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb63fff CR3: 000000007e05c000 CR4: 00000000003526f0 Call Trace: as102_dvb_dmx_start_feed+0x70/0x290 drivers/media/usb/as102/as102_drv.c:139 dmx_section_feed_start_filtering+0x518/0x6c0 drivers/media/dvb-core/dvb_demux.c:977 dvb_dmxdev_filter_start+0xcf4/0x10e0 drivers/media/dvb-core/dmxdev.c:760 dvb_demux_do_ioctl+0x470/0x540 drivers/media/dvb-core/dmxdev.c:1083 dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9a3979c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffef627ed38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9a39a15fa0 RCX: 00007f9a3979c799 RDX: 0000200000000200 RSI: 00000000403c6f2b RDI: 0000000000000004 RBP: 00007f9a39832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a39a15fac R14: 00007f9a39a15fa0 R15: 00007f9a39a15fa0 ---------------- Code disassembly (best guess): 0: 11 90 48 c1 e8 03 adc %edx,0x3e8c148(%rax) 6: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax b: 84 c0 test %al,%al d: 0f 85 33 02 00 00 jne 0x246 13: 83 3d d9 a1 61 04 00 cmpl $0x0,0x461a1d9(%rip) # 0x461a1f3 1a: 75 13 jne 0x2f 1c: 48 8d 3d 1c b7 64 04 lea 0x464b71c(%rip),%rdi # 0x464b73f 23: 48 c7 c6 c0 e0 cc 8b mov $0xffffffff8bcce0c0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 ac f0 ff ff jmp 0xfffff0e1 35: 90 nop 36: 0f 0b ud2 38: 90 nop 39: e9 73 f4 ff ff jmp 0xfffff4b1 3e: 90 nop 3f: 0f .byte 0xf --- 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 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. 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