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([2001:981:6fec:1:c857:3b83:8809:ffc9]) by smtp.gmail.com with ESMTPSA id kw10sm3394920ejc.111.2021.08.27.15.41.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Aug 2021 15:41:34 -0700 (PDT) Subject: Re: Crash on unplug smsc95xx on 5.14.0-rc6 From: Ferry Toth To: UNGLinuxDriver@microchip.com Cc: Linux Kernel Mailing List , netdev@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu References: <07628a9b-1370-98b7-c1f3-98b9bf8cc38f@gmail.com> Message-ID: <529eae08-397f-13c8-833f-ee04275e5470@gmail.com> Date: Sat, 28 Aug 2021 00:41:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <07628a9b-1370-98b7-c1f3-98b9bf8cc38f@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi Op 25-08-2021 om 22:42 schreef Ferry Toth: > With 5.14.0-rc6 smsc9504 attached to dwc3 host (Intel Merrifield) > unplugging leads to the following stack trace: > > kernel: kernfs: can not remove 'attached_dev', no directory > kernel: WARNING: CPU: 0 PID: 23 at fs/kernfs/dir.c:1508 > kernfs_remove_by_name_ns+0x7e/0x90 > kernel: Modules linked in: rfcomm iptable_nat bnep snd_sof_nocodec > spi_pxa2xx_platform dw_dmac smsc smsc95xx pwm_lpss_pci dw_dmac_pci > pwm_lpss dw_dmac_core snd_sof_pc> > kernel: CPU: 0 PID: 23 Comm: kworker/0:1 Not tainted > 5.14.0-rc6-edison-acpi-standard #1 > kernel: Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 > 2015.01.21:18.19.48 > kernel: Workqueue: usb_hub_wq hub_event > kernel: RIP: 0010:kernfs_remove_by_name_ns+0x7e/0x90 > kernel: Code: ff 9a 00 31 c0 5d 41 5c 41 5d c3 48 c7 c7 e0 48 f6 b2 e8 > 15 ff 9a 00 b8 fe ff ff ff eb e7 48 c7 c7 d0 fa a8 b2 e8 cb c6 94 00 > <0f> 0b b8 fe ff ff ff eb > > kernel: RSP: 0018:ffffa514000cfa10 EFLAGS: 00010282 > kernel: RAX: 0000000000000000 RBX: ffff9a9008a3d8c0 RCX: ffff9a903e217478 > kernel: RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff9a903e217470 > kernel: RBP: ffff9a90023d3000 R08: ffffffffb2f341c8 R09: 0000000000009ffb > kernel: R10: 00000000ffffe000 R11: 3fffffffffffffff R12: ffffffffb2af705d > kernel: R13: ffff9a9008a3d8c0 R14: ffffa514000cfb10 R15: 0000000000000003 > kernel: FS:  0000000000000000(0000) GS:ffff9a903e200000(0000) > knlGS:0000000000000000 > kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > kernel: CR2: 00007fe6971fcca0 CR3: 0000000007b02000 CR4: 00000000001006f0 > kernel: Call Trace: > kernel:  phy_detach+0x10b/0x170 > kernel:  smsc95xx_disconnect_phy+0x2a/0x30 [smsc95xx] > kernel:  usbnet_stop+0x5d/0x130 > kernel:  __dev_close_many+0x99/0x110 > kernel:  dev_close_many+0x76/0x120 > kernel:  unregister_netdevice_many+0x13d/0x750 > kernel:  unregister_netdevice_queue+0x80/0xc0 > kernel:  unregister_netdev+0x13/0x20 > kernel:  usbnet_disconnect+0x54/0xb0 > kernel:  usb_unbind_interface+0x85/0x270 > kernel:  ? kernfs_find_ns+0x30/0xc0 > kernel:  __device_release_driver+0x175/0x230 > kernel:  device_release_driver+0x1f/0x30 > kernel:  bus_remove_device+0xd3/0x140 > kernel:  device_del+0x186/0x3e0 > kernel:  ? kobject_put+0x91/0x1d0 > kernel:  usb_disable_device+0xc1/0x1e0 > kernel:  usb_disconnect.cold+0x7a/0x1f7 > kernel:  usb_disconnect.cold+0x29/0x1f7 > kernel:  hub_event+0xbb9/0x1830 > kernel:  ? __switch_to_asm+0x42/0x70 > kernel:  ? __switch_to_asm+0x36/0x70 > kernel:  process_one_work+0x1cf/0x370 > kernel:  worker_thread+0x48/0x3d0 > kernel:  ? rescuer_thread+0x360/0x360 > kernel:  kthread+0x122/0x140 > kernel:  ? set_kthread_struct+0x40/0x40 > kernel:  ret_from_fork+0x22/0x30 > > The unplug event happen when switching dwc3 from host  to device mode. > > I'm not sure when this behavior started exactly, but al least since > 5.14.0-rc1. Ideas how to continue welcome. > Maybe related: smsc95xx plugin seems to trigger: > > DMA-API: cacheline tracking EEXIST, overlapping mappings aren't supported > OTOH the cache line error might be due to reporting the error is relatively new: https://lore.kernel.org/lkml/20210518125443.34148-1-someguy@effective-light.com/ So maybe unrelated to crash.