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11 Feb 2020 04:27:31 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="405924314" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by orsmga005.jf.intel.com with ESMTP; 11 Feb 2020 04:27:29 -0800 Subject: Re: [RFT PATCH] xhci: Fix memory leak when caching protocol extended capability PSI tables To: Greg KH , Marek Szyprowski Cc: pmenzel@molgen.mpg.de, mika.westerberg@linux.intel.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, 'Linux Samsung SOC' , Krzysztof Kozlowski References: <572bea6f-06d4-938a-802e-93386acf59d9@linux.intel.com> <20200108151730.21022-1-mathias.nyman@linux.intel.com> <089285ab-7041-49bb-54ea-c73b25f96f48@samsung.com> <20200211122316.GG1856500@kroah.com> From: Mathias Nyman Openpgp: preference=signencrypt Autocrypt: addr=mathias.nyman@linux.intel.com; prefer-encrypt=mutual; keydata= mQINBFMB0ccBEADd+nZnZrFDsIjQtclVz6OsqFOQ6k0nQdveiDNeBuwyFYykkBpaGekoHZ6f lH4ogPZzQ+pzoJEMlRGXc881BIggKMCMH86fYJGfZKWdfpg9O6mqSxyEuvBHKe9eZCBKPvoC L2iwygtO8TcXXSCynvXSeZrOwqAlwnxWNRm4J2ikDck5S5R+Qie0ZLJIfaId1hELofWfuhy+ tOK0plFR0HgVVp8O7zWYT2ewNcgAzQrRbzidA3LNRfkL7jrzyAxDapuejuK8TMrFQT/wW53e uegnXcRJaibJD84RUJt+mJrn5BvZ0MYfyDSc1yHVO+aZcpNr+71yZBQVgVEI/AuEQ0+p9wpt O9Wt4zO2KT/R5lq2lSz1MYMJrtfFRKkqC6PsDSB4lGSgl91XbibK5poxrIouVO2g9Jabg04T MIPpVUlPme3mkYHLZUsboemRQp5/pxV4HTFR0xNBCmsidBICHOYAepCzNmfLhfo1EW2Uf+t4 L8IowAaoURKdgcR2ydUXjhACVEA/Ldtp3ftF4hTQ46Qhba/p4MUFtDAQ5yeA5vQVuspiwsqB BoL/298+V119JzM998d70Z1clqTc8fiGMXyVnFv92QKShDKyXpiisQn2rrJVWeXEIVoldh6+ J8M3vTwzetnvIKpoQdSFJ2qxOdQ8iYRtz36WYl7hhT3/hwkHuQARAQABtCdNYXRoaWFzIE55 bWFuIDxtYXRoaWFzLm55bWFuQGdtYWlsLmNvbT6JAjsEEwECACUCGwMGCwkIBwMCBhUIAgkK CwQWAgMBAh4BAheABQJTAeo1AhkBAAoJEFiDn/uYk8VJOdIP/jhA+RpIZ7rdUHFIYkHEKzHw tkwrJczGA5TyLgQaI8YTCTPSvdNHU9Rj19mkjhUO/9MKvwfoT2RFYqhkrtk0K92STDaBNXTL JIi4IHBqjXOyJ/dPADU0xiRVtCHWkBgjEgR7Wihr7McSdVpgupsaXhbZjXXgtR/N7PE0Wltz hAL2GAnMuIeJyXhIdIMLb+uyoydPCzKdH6znfu6Ox76XfGWBCqLBbvqPXvk4oH03jcdt+8UG 2nfSeti/To9ANRZIlSKGjddCGMa3xzjtTx9ryf1Xr0MnY5PeyNLexpgHp93sc1BKxKKtYaT0 lR6p0QEKeaZ70623oB7Sa2Ts4IytqUVxkQKRkJVWeQiPJ/dZYTK5uo15GaVwufuF8VTwnMkC 4l5X+NUYNAH1U1bpRtlT40aoLEUhWKAyVdowxW4yGCP3nL5E69tZQQgsag+OnxBa6f88j63u wxmOJGNXcwCerkCb+wUPwJzChSifFYmuV5l89LKHgSbv0WHSN9OLkuhJO+I9fsCNvro1Y7dT U/yq4aSVzjaqPT3yrnQkzVDxrYT54FLWO1ssFKAOlcfeWzqrT9QNcHIzHMQYf5c03Kyq3yMI Xi91hkw2uc/GuA2CZ8dUD3BZhUT1dm0igE9NViE1M7F5lHQONEr7MOCg1hcrkngY62V6vh0f RcDeV0ISwlZWuQINBFMB0ccBEACXKmWvojkaG+kh/yipMmqZTrCozsLeGitxJzo5hq9ev31N 2XpPGx4AGhpccbco63SygpVN2bOd0W62fJJoxGohtf/g0uVtRSuK43OTstoBPqyY/35+VnAV oA5cnfvtdx5kQPIL6LRcxmYKgN4/3+A7ejIxbOrjWFmbWCC+SgX6mzHHBrV0OMki8R+NnrNa NkUmMmosi7jBSKdoi9VqDqgQTJF/GftvmaZHqgmVJDWNrCv7UiorhesfIWPt1O/AIk9luxlE dHwkx5zkWa9CGYvV6LfP9BznendEoO3qYZ9IcUlW727Le80Q1oh69QnHoI8pODDBBTJvEq1h bOWcPm/DsNmDD8Rwr/msRmRyIoxjasFi5WkM/K/pzujICKeUcNGNsDsEDJC5TCmRO/TlvCvm 0X+vdfEJRZV6Z+QFBflK1asUz9QHFre5csG8MyVZkwTR9yUiKi3KiqQdaEu+LuDD2CGF5t68 xEl66Y6mwfyiISkkm3ETA4E8rVZP1rZQBBm83c5kJEDvs0A4zrhKIPTcI1smK+TWbyVyrZ/a mGYDrZzpF2N8DfuNSqOQkLHIOL3vuOyx3HPzS05lY3p+IIVmnPOEdZhMsNDIGmVorFyRWa4K uYjBP/W3E5p9e6TvDSDzqhLoY1RHfAIadM3I8kEx5wqco67VIgbIHHB9DbRcxQARAQABiQIf BBgBAgAJBQJTAdHHAhsMAAoJEFiDn/uYk8VJb7AQAK56tgX8V1Wa6RmZDmZ8dmBC7W8nsMRz PcKWiDSMIvTJT5bygMy1lf7gbHXm7fqezRtSfXAXr/OJqSA8LB2LWfThLyuuCvrdNsQNrI+3 D+hjHJjhW/4185y3EdmwwHcelixPg0X9EF+lHCltV/w29Pv3PiGDkoKxJrnOpnU6jrwiBebz eAYBfpSEvrCm4CR4hf+T6MdCs64UzZnNt0nxL8mLCCAGmq1iks9M4bZk+LG36QjCKGh8PDXz 9OsnJmCggptClgjTa7pO6040OW76pcVrP2rZrkjo/Ld/gvSc7yMO/m9sIYxLIsR2NDxMNpmE q/H7WO+2bRG0vMmsndxpEYS4WnuhKutoTA/goBEhtHu1fg5KC+WYXp9wZyTfeNPrL0L8F3N1 BCEYefp2JSZ/a355X6r2ROGSRgIIeYjAiSMgGAZMPEVsdvKsYw6BH17hDRzltNyIj5S0dIhb Gjynb3sXforM/GVbr4mnuxTdLXQYlj2EJ4O4f0tkLlADT7podzKSlSuZsLi2D+ohKxtP3U/r 42i8PBnX2oAV0UIkYk7Oel/3hr0+BP666SnTls9RJuoXc7R5XQVsomqXID6GmjwFQR5Wh/RE IJtkiDAsk37cfZ9d1kZ2gCQryTV9lmflSOB6AFZkOLuEVSC5qW8M/s6IGDfYXN12YJaZPptJ fiD/ Message-ID: <9d314940-086e-d9a7-88e2-88447cd1c67d@linux.intel.com> Date: Tue, 11 Feb 2020 14:29:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200211122316.GG1856500@kroah.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11.2.2020 14.23, Greg KH wrote: > On Tue, Feb 11, 2020 at 11:56:12AM +0100, Marek Szyprowski wrote: >> Hi >> >> On 08.01.2020 16:17, Mathias Nyman wrote: >>> xhci driver assumed that xHC controllers have at most one custom >>> supported speed table (PSI) for all usb 3.x ports. >>> Memory was allocated for one PSI table under the xhci hub structure. >>> >>> Turns out this is not the case, some controllers have a separate >>> "supported protocol capability" entry with a PSI table for each port. >>> This means each usb3 port can in theory support different custom speeds. >>> >>> To solve this cache all supported protocol capabilities with their PSI >>> tables in an array, and add pointers to the xhci port structure so that >>> every port points to its capability entry in the array. >>> >>> When creating the SuperSpeedPlus USB Device Capability BOS descriptor >>> for the xhci USB 3.1 roothub we for now will use only data from the >>> first USB 3.1 capable protocol capability entry in the array. >>> This could be improved later, this patch focuses resolving >>> the memory leak. >>> >>> Reported-by: Paul Menzel >>> Reported-by: Sajja Venkateswara Rao >>> Signed-off-by: Mathias Nyman >> >> This patch landed in today's linux-next (20200211) and causes NULL >> pointer dereference during second suspend/resume cycle on Samsung >> Exynos5422-based (arm 32bit) Odroid XU3lite board: >> >> # time rtcwake -s10 -mmem >> rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Feb 11 10:51:43 2020 >> PM: suspend entry (deep) >> Filesystems sync: 0.012 seconds >> Freezing user space processes ... (elapsed 0.010 seconds) done. >> OOM killer disabled. >> Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done. >> smsc95xx 1-1.1:1.0 eth0: entering SUSPEND2 mode >> wake enabled for irq 153 >> wake enabled for irq 158 >> samsung-pinctrl 13400000.pinctrl: Setting external wakeup interrupt >> mask: 0xffffffe7 >> Disabling non-boot CPUs ... >> IRQ 51: no longer affine to CPU1 >> IRQ 52: no longer affine to CPU2 >> s3c2410-wdt 101d0000.watchdog: watchdog disabled >> wake disabled for irq 158 >> usb usb1: root hub lost power or was reset >> usb usb2: root hub lost power or was reset >> wake disabled for irq 153 >> exynos-tmu 10060000.tmu: More trip points than supported by this TMU. >> exynos-tmu 10060000.tmu: 2 trip points should be configured in polling mode. >> exynos-tmu 10064000.tmu: More trip points than supported by this TMU. >> exynos-tmu 10064000.tmu: 2 trip points should be configured in polling mode. >> exynos-tmu 10068000.tmu: More trip points than supported by this TMU. >> exynos-tmu 10068000.tmu: 2 trip points should be configured in polling mode. >> exynos-tmu 1006c000.tmu: More trip points than supported by this TMU. >> exynos-tmu 1006c000.tmu: 2 trip points should be configured in polling mode. >> exynos-tmu 100a0000.tmu: More trip points than supported by this TMU. >> exynos-tmu 100a0000.tmu: 6 trip points should be configured in polling mode. >> usb usb3: root hub lost power or was reset >> s3c-rtc 101e0000.rtc: rtc disabled, re-enabling >> usb usb4: root hub lost power or was reset >> xhci-hcd xhci-hcd.8.auto: No ports on the roothubs? >> PM: dpm_run_callback(): platform_pm_resume+0x0/0x44 returns -12 >> PM: Device xhci-hcd.8.auto failed to resume async: error -12 >> hub 3-0:1.0: hub_ext_port_status failed (err = -32) >> hub 4-0:1.0: hub_ext_port_status failed (err = -32) >> usb 1-1: reset high-speed USB device number 2 using exynos-ehci >> usb 1-1.1: reset high-speed USB device number 3 using exynos-ehci >> OOM killer enabled. >> Restarting tasks ... done. >> >> real    0m11.890s >> user    0m0.001s >> sys     0m0.679s >> root@target:~# PM: suspend exit >> mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 400000Hz, >> actual 396825HZ div = 63) >> mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 200000000Hz, >> actual 200000000HZ div = 0) >> mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 52000000Hz, >> actual 50000000HZ div = 0) >> mmc_host mmc0: Bus speed (slot 0) = 400000000Hz (slot req 200000000Hz, >> actual 200000000HZ div = 1) >> smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1 >> >> root@target:~# >> root@target:~# time rtcwake -s10 -mmem[   35.451572] vdd_ldo12: disabling >> >> rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Feb 11 10:52:02 2020 >> PM: suspend entry (deep) >> Filesystems sync: 0.004 seconds >> Freezing user space processes ... (elapsed 0.006 seconds) done. >> OOM killer disabled. >> Freezing remaining freezable tasks ... (elapsed 0.070 seconds) done. >> hub 4-0:1.0: hub_ext_port_status failed (err = -32) >> hub 3-0:1.0: hub_ext_port_status failed (err = -32) >> 8<--- cut here --- >> Unable to handle kernel NULL pointer dereference at virtual address 00000014 >> pgd = 4c26b54b >> [00000014] *pgd=00000000 >> Internal error: Oops: 17 [#1] PREEMPT SMP ARM >> Modules linked in: >> CPU: 3 PID: 1468 Comm: kworker/u16:23 Not tainted >> 5.6.0-rc1-next-20200211 #268 >> Hardware name: Samsung Exynos (Flattened Device Tree) >> Workqueue: events_unbound async_run_entry_fn >> PC is at xhci_suspend+0x12c/0x520 >> LR is at 0xa6aa9898 >> pc : []    lr : []    psr: 60000093 >> sp : ec401df8  ip : 0000001a  fp : c12e7864 >> r10: 00000000  r9 : ecfb87b0  r8 : ecfb8220 >> r7 : 00000000  r6 : 00000000  r5 : 00000004  r4 : ecfb81f0 >> r3 : 00007d00  r2 : 00000001  r1 : 00000001  r0 : 00000000 >> Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none >> Control: 10c5387d  Table: 6bd4006a  DAC: 00000051 >> Process kworker/u16:23 (pid: 1468, stack limit = 0x6e4b6fba) >> Stack: (0xec401df8 to 0xec402000) >> ... >> [] (xhci_suspend) from [] (dpm_run_callback+0xb4/0x3fc) >> [] (dpm_run_callback) from [] >> (__device_suspend+0x134/0x7e8) >> [] (__device_suspend) from [] (async_suspend+0x1c/0x94) >> [] (async_suspend) from [] >> (async_run_entry_fn+0x48/0x1b8) >> [] (async_run_entry_fn) from [] >> (process_one_work+0x230/0x7bc) >> [] (process_one_work) from [] (worker_thread+0x44/0x524) >> [] (worker_thread) from [] (kthread+0x130/0x164) >> [] (kthread) from [] (ret_from_fork+0x14/0x20) >> Exception stack(0xec401fb0 to 0xec401ff8) >> ... >> ---[ end trace c72caf6487666442 ]--- >> note: kworker/u16:23[1468] exited with preempt_count 1 >> >> Reverting it fixes the NULL pointer issue. I can provide more >> information or do some other tests. Just let me know what will help to >> fix it. >> >> > ... > > Ugh. Mathias, should I just revert this for now? > Yes, revert it. This looks very odd, after second resume, and losing power driver can't find any port at all. Marek, do you still get the "xhci-hcd xhci-hcd.8.auto: No ports on the roothubs?" message on second resume after reverting the patch? -Mathias