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Wed, 09 Jan 2019 18:39:36 -0800 (PST) MIME-Version: 1.0 References: <20190108130747.GA13437@Red> In-Reply-To: <20190108130747.GA13437@Red> From: Peter Chen Date: Thu, 10 Jan 2019 10:39:24 +0800 Message-ID: Subject: Re: [BUG] rmmod g_mass_storage result to segmentation fault To: Corentin Labbe Cc: balbi@kernel.org, Greg Kroah-Hartman , Thinh.Nguyen@synopsys.com, linux-usb@vger.kernel.org, lkml Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > When running an imx_defconfig on a imx6q-sabrelite, rmmod g_mass_storage = lead to the following crash: > [ 143.952834] Internal error: Oops: 817 [#1] SMP ARM > [ 143.957639] Modules linked in: dmatest psmouse serport da9063_wdt wl12= xx wl18xx wlcore wlcore_sdio brcmfmac brcmutil mwifiex_sdio mwifiex_pcie mw= ifiex rtl8150 pegasus cdc_eem i2c_algo_pca i2c_algo_pcf echainiv bnep crc_c= citt libcrc32c crc7 isofs nls_iso8859_15 udf crc_itu_t msdos binfmt_misc gs= pca_main uvcvideo adv7180 snd_usb_audio snd_hwdep snd_usbmidi_lib usb_f_uac= 2 usb_f_hid usb_f_uac1 u_audio usb_f_obex usb_f_eem usb_f_printer usb_f_uvc= usb_f_ecm usb_f_midi snd_rawmidi usb_f_ecm_subset usb_f_ss_lb usb_f_serial= usb_f_ncm g_ffs usb_f_fs g_zero g_audio g_mass_storage(-) usb_f_mass_stora= ge usb_f_rndis u_ether usb_f_acm u_serial libcomposite configfs usb_wwan us= bserial imx_vdoa videobuf2_vmalloc [last unloaded: g_ncm] > [ 144.021308] CPU: 3 PID: 9158 Comm: rmmod Not tainted 5.0.0-rc1-next-20= 190108 #1 > [ 144.028623] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > [ 144.035170] PC is at usb_gadget_unregister_driver+0xac/0xd4 > [ 144.040748] LR is at 0x1242afc4 > [ 144.043895] pc : [] lr : [<1242afc4>] psr: 60000013 > [ 144.050166] sp : ed0e7f48 ip : a54b4ce2 fp : 00000000 > [ 144.055396] r10: 00000081 r9 : ed0e6000 r8 : c01011c4 > [ 144.060626] r7 : 00000081 r6 : bec49b98 r5 : bf12916c r4 : c129176c > [ 144.067159] r3 : 00000200 r2 : 00000100 r1 : 00000200 r0 : 00000100 > [ 144.073693] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segme= nt none > [ 144.080833] Control: 10c5387d Table: 3d33404a DAC: 00000051 > [ 144.086585] Process rmmod (pid: 9158, stack limit =3D 0x2ac398d3) > [ 144.092510] Stack: (0xed0e7f48 to 0xed0e8000) > [ 144.096877] 7f40: bf129200 c120c908 bec49b98 c01c965= c 616d5f67 735f7373 > [ 144.105063] 7f60: 61726f74 b6006567 00000017 c01175c8 b6f114c8 ed0e7fb= 0 bec49e14 000a1a98 > [ 144.113249] 7f80: bec49b7c c0117aec ffffffff c33d43a5 000278d4 c33d43a= 5 000278d4 616d5f67 > [ 144.121435] 7fa0: 735f7373 c0101000 000278d4 616d5f67 bec49b98 0000088= 0 00000000 bec49e18 > [ 144.129621] 7fc0: 000278d4 616d5f67 735f7373 00000081 00000000 0000000= 0 b6faf000 00000000 > [ 144.137807] 7fe0: bec49b90 bec49b80 000277b8 b6eb52f0 60000010 bec49b9= 8 00000000 00000000 > [ 144.146006] [] (usb_gadget_unregister_driver) from [] (sys_delete_module+0x130/0x1dc) > [ 144.155586] [] (sys_delete_module) from [] (ret_fa= st_syscall+0x0/0x28) > [ 144.163855] Exception stack(0xed0e7fa8 to 0xed0e7ff0) > [ 144.168914] 7fa0: 000278d4 616d5f67 bec49b98 0000088= 0 00000000 bec49e18 > [ 144.177100] 7fc0: 000278d4 616d5f67 735f7373 00000081 00000000 0000000= 0 b6faf000 00000000 > [ 144.185283] 7fe0: bec49b90 bec49b80 000277b8 b6eb52f0 > [ 144.190344] Code: e5953070 e595206c e3a00c01 e3a01c02 (e5823004) > [ 144.196538] ---[ end trace 86952e6cc74d8e8b ]--- > Segmentation fault Some questions: - Do you have issue for previous version,eg, v4.19 or v4.20? - Legacy gadget driver is not supported well now, do you have issues with configfs? - Any differences if the cable is connected or not? Peter