Re: Crash in usb_f_mass_storage

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On 14 Oct 2015, at 15:37, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, 14 Oct 2015, Paul Jones wrote:
> 
>> On 12 Oct 2015, at 14:16, Felipe Balbi <balbi@xxxxxx> wrote:
>> 
>>> 
>>> Hi,
>>> 
>>> Paul Jones <p.jones@xxxxxxxxxx> writes:
>>>> On 10 Oct 2015, at 16:32, Paul Jones <p.jones@xxxxxxxxxx> wrote:
>>>> 
>>>>> I came across the following kernel message on the latest 4.3-rc4 whilst performance testing on a USB3380 device connected to a Mac (10.9.5):
>>>>> 
>>>>> [   51.613838] WARNING: CPU: 2 PID: 0 at drivers/usb/gadget/function/f_mass_storage.c:346 fsg_setup+0x12a/0x170 [usb_f_mass_storage]()
>>>>> [   51.613838] Modules linked in: usb_f_mass_storage libcomposite configfs drbg ansi_cprng ctr ccm arc4 snd_hda_codec_hdmi iwlmvm i915 mac80211 snd_hda_codec_realtek snd_hda_codec_generic hid_generic intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi kvm_intel cfg80211 kvm drm_kms_helper drm snd_hda_intel snd_hda_codec btusb btrtl crct10dif_pclmul crc32_pclmul btbcm snd_hda_core ghash_clmulni_intel btintel bluetooth snd_hwdep e1000e aesni_intel aes_x86_64 lrw snd_pcm gf128mul glue_helper ablk_helper cryptd serio_raw alx mei_me lpc_ich usbhid mei snd_timer snd net2280 i2c_algo_bit ptp udc_core fb_sys_fops mdio syscopyarea pps_core sysfillrect soundcore sysimgblt i2c_hid hid video dw_dmac sdhci_acpi shpchp i2c_designware_platform dw_dmac_core spi_pxa2xx_platform sdhci 8250_dw i2c_designware_core acpi_pad lp mac_hid parport
>>>>> [   51.613858] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G        W       4.3.0-rc4+ #4
>>>>> [   51.613859] Hardware name: Gigabyte Technology Co., Ltd. H97N-WIFI/H97N-WIFI, BIOS F7 04/21/2015
>>>>> [   51.613860]  ffffffffa03e9e10 ffff88021eb03d70 ffffffff81393f5d 0000000000000000
>>>>> [   51.613861]  ffff88021eb03da8 ffffffff81075856 ffff880037be4400 ffff88020b3023c8
>>>>> [   51.613862]  ffff880037be4400 00000000ffffffa1 0000000000000000 ffff88021eb03db8
>>>>> [   51.613863] Call Trace:
>>>>> [   51.613864]  <IRQ>  [<ffffffff81393f5d>] dump_stack+0x44/0x57
>>>>> [   51.613867]  [<ffffffff81075856>] warn_slowpath_common+0x86/0xc0
>>>>> [   51.613868]  [<ffffffff8107594a>] warn_slowpath_null+0x1a/0x20
>>>>> [   51.613870]  [<ffffffffa03e4c2a>] fsg_setup+0x12a/0x170 [usb_f_mass_storage]
>>>>> [   51.613872]  [<ffffffffa036ebd3>] composite_setup+0x173/0x16b0 [libcomposite]
>>>>> [   51.613873]  [<ffffffff810e41da>] ? ktime_get+0x3a/0x90
>>>>> [   51.613874]  [<ffffffff8104dac9>] ? lapic_next_deadline+0x29/0x30
>>>>> [   51.613875]  [<ffffffff810e41da>] ? ktime_get+0x3a/0x90
>>>>> [   51.613877]  [<ffffffffa00e8452>] net2280_irq+0xba2/0x10db [net2280]
>>>>> [   51.613879]  [<ffffffff810cb8b9>] handle_irq_event_percpu+0x39/0x180
>>>>> [   51.613880]  [<ffffffff810cba45>] handle_irq_event+0x45/0x70
>>>>> [   51.613881]  [<ffffffff810ceab9>] handle_edge_irq+0x99/0x150
>>>>> [   51.613883]  [<ffffffff810190cd>] handle_irq+0x1d/0x30
>>>>> [   51.613883]  [<ffffffff8177ccbd>] do_IRQ+0x4d/0xd0
>>>>> [   51.613885]  [<ffffffff8177a947>] common_interrupt+0x87/0x87
>>>>> [   51.613885]  <EOI>  [<ffffffff81631638>] ? cpuidle_enter_state+0xb8/0x220
>>>>> [   51.613888]  [<ffffffff816317d7>] cpuidle_enter+0x17/0x20
>>>>> [   51.613889]  [<ffffffff810b5b52>] call_cpuidle+0x32/0x60
>>>>> [   51.613890]  [<ffffffff816317b3>] ? cpuidle_select+0x13/0x20
>>>>> [   51.613891]  [<ffffffff810b5d9c>] cpu_startup_entry+0x21c/0x2e0
>>>>> [   51.613891]  [<ffffffff8104c4d4>] start_secondary+0x104/0x130
>>>>> [   51.613892] ---[ end trace bda1c37ade46c57d ]�
>>>>> 
>>>>> I can also reliable reproduce this by connecting the USB3380 to a USB port on the same Linux machine.
>>>>> In that case I also see an error:
>>>>> net2280 <pci-id>: net2280_enable: error=-22
>>>>> 
>>>>> Perhaps unrelated, but there is also a message:
>>>>> configfs-gadget gadget: common->fsg is NULL in fsg_setup at 511
>>>> The same crash happens in 4.2 as well but not in 4.1.
>>> 
>>> care to run a git bisect and find offending commit ?
>> Unfortunately I encountered many kernels that hung my machine during a git bisect, so I had to git bisect skip many a time.
>> Here�s the git bisect result (between v4.1 and v4.2):
>>  There are only 'skip'ped commits left to test.
>>  The first bad commit could be any of:
>>  4117a60c8e4c8d5f9fc05578e359d09d0fdf9d07
>>  4ae82e5d23961515796d76850499db3866c5e73b
>>  We cannot bisect more!
>> 
>> Oddly neither of those commits seem very relevant to the problem. Not sure if this helps�
> 
> Mian Yousaf Kaukab added a bunch of changes to the net2280 driver 
> between 4.1 and 4.2.  Do:
> 
> 	git log v4.1..v4.2 -- drivers/usb/gadget/udc/net2280.c
> 
> One of them may be responsible.
I’ll try a manual bisect based on that.

Paul.

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