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AKwUvBwBO/0J5fp6t5ZBcQJ2UJaSdB3ngwyjtHyIrWJw/esd6S5mTnBdpxiiuGC6csLTRIKvXL+HkAdmIFbJPkk=@vger.kernel.org X-Gm-Message-State: AFuF++lvajcWqhhAkLdDpioszGCfiKUK0wLEo4UQcCNaPz6BsX8JwGHL DRHDdld/OhjZhxi/e8tV1WRbST7yxvw+SjNxcTJp8Lw4an8UYSqSrA9Oq2tnEx+Hai8/yqtO223 oVd4uqk9MNXmFBhCJld1o9GEzSzbJMEa+BIsUUnMBw/GQp6xBYYbQo5LpGXY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4fe3:b0:4f8:716d:7706 with SMTP id 5614622812f47-4f8716d795amr4893687b6e.65.1791233403632; Mon, 05 Oct 2026 13:50:03 -0700 (PDT) Date: Mon, 05 Oct 2026 13:50:03 -0700 In-Reply-To: <20261005180430.24652-2-jakovnovak30@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac40d7b.9ad129c8.3858c0.0040.GAE@google.com> Subject: Re: [syzbot] [media?] [usb?] WARNING in smsusb_term_device (2) From: syzbot To: jakovnovak30@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in enable_work ------------[ cut here ]------------ workqueue: work disable count underflowed WARNING: kernel/workqueue.c:4530 at work_offqd_enable kernel/workqueue.c:4530 [inline], CPU#1: kworker/1:2/5325 WARNING: kernel/workqueue.c:4530 at enable_work+0x1c7/0x230 kernel/workqueue.c:4701, CPU#1: kworker/1:2/5325 Modules linked in: CPU: 1 UID: 0 PID: 5325 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:work_offqd_enable kernel/workqueue.c:4530 [inline] RIP: 0010:enable_work+0x1c7/0x230 kernel/workqueue.c:4701 Code: cf 19 38 00 4d 85 f6 75 48 e8 c5 19 38 00 eb 47 e8 be 19 38 00 90 0f 0b 90 e9 bc fe ff ff e8 b0 19 38 00 48 8d 3d 99 1c 26 0e <67> 48 0f b9 3a e9 d2 fe ff ff e8 9a 19 38 00 90 0f 0b 90 e9 1d ff RSP: 0018:ffffc900048aeae0 EFLAGS: 00010093 RAX: ffffffff818ebc00 RBX: 0000000000000000 RCX: ffff888020bc0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8fb4d8a0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed10170e7719 R12: 1ffff110053a8807 R13: 0000000001800001 R14: ffff888029d44038 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125cc2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd1bfdeb840 CR3: 0000000038686000 CR4: 00000000003526f0 Call Trace: __cancel_work_sync+0xf8/0x110 kernel/workqueue.c:4571 smsusb_stop_streaming drivers/media/usb/siano/smsusb.c:183 [inline] smsusb_term_device+0xdd/0x260 drivers/media/usb/siano/smsusb.c:345 smsusb_init_device drivers/media/usb/siano/smsusb.c:499 [inline] smsusb_probe+0x1aba/0x2280 drivers/media/usb/siano/smsusb.c:577 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1bb5/0x2260 drivers/usb/core/message.c:2274 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x99a/0x1680 drivers/usb/core/hub.c:2713 hub_port_connect drivers/usb/core/hub.c:5585 [inline] hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] port_event drivers/usb/core/hub.c:5889 [inline] hub_event+0x28cf/0x4cf0 drivers/usb/core/hub.c:5971 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: cf iret 1: 19 38 sbb %edi,(%rax) 3: 00 4d 85 add %cl,-0x7b(%rbp) 6: f6 75 48 divb 0x48(%rbp) 9: e8 c5 19 38 00 call 0x3819d3 e: eb 47 jmp 0x57 10: e8 be 19 38 00 call 0x3819d3 15: 90 nop 16: 0f 0b ud2 18: 90 nop 19: e9 bc fe ff ff jmp 0xfffffeda 1e: e8 b0 19 38 00 call 0x3819d3 23: 48 8d 3d 99 1c 26 0e lea 0xe261c99(%rip),%rdi # 0xe261cc3 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d2 fe ff ff jmp 0xffffff06 34: e8 9a 19 38 00 call 0x3819d3 39: 90 nop 3a: 0f 0b ud2 3c: 90 nop 3d: e9 .byte 0xe9 3e: 1d .byte 0x1d 3f: ff .byte 0xff Tested on: commit: 67f0943b Merge tag 'selinux-pr-20261005' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f27ec9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=341a98f91c13ec9 dashboard link: https://syzkaller.appspot.com/bug?extid=d627b1495de0e851be32 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1237bec9580000