2018-05-25 0:54 GMT+02:00 Daniele Palmas <dnlplm@xxxxxxxxx>: > Hi Greg, > > 2018-05-24 17:53 GMT+02:00 Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>: >> On Thu, May 24, 2018 at 05:04:49PM +0200, Daniele Palmas wrote: >>> Hello, >>> >>> I have an issue with an USB mbim modem when trying to send with ping >>> more than 14552 bytes: it looks like to me a kernel issue, but not at >>> the cdc_mbim or cdc_ncm level, anyway not sure, so I'm reporting the >>> issue. >>> >>> My kernel is 4.16. The device is the following: >> >> Does older kernels work, or is this something that has always been >> there? >> > > Not tested yet, I'm going to do. > So, ping with more than 14552 was working properly until v4.5-rc7: starting from v4.5 I'm not even able to make a data connection with mbim since things fail badly with the following: [ 259.551836] ------------[ cut here ]------------ [ 259.551848] WARNING: CPU: 2 PID: 0 at /home/kernel/COD/linux/net/sched/sch_generic.c:303 dev_watchdog+0x237/0x240() [ 259.551860] NETDEV WATCHDOG: wwp0s20u7i2 (cdc_mbim): transmit queue 0 timed out [ 259.551861] Modules linked in: cdc_mbim cdc_wdm cdc_ncm usbnet mii intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic irqbypass crct10dif_pclmul snd_hda_intel snd_hda_codec snd_hda_core crc32_pclmul snd_hwdep ghash_clmulni_intel aesni_intel aes_x86_64 snd_pcm snd_seq_midi lrw snd_seq_midi_event gf128mul input_leds snd_rawmidi snd_seq glue_helper snd_seq_device ablk_helper snd_timer cryptd snd soundcore shpchp serio_raw mac_hid lpc_ich 8250_fintek mei_me mei parport_pc ppdev lp parport autofs4 hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect psmouse sysimgblt ahci fb_sys_fops e1000e libahci drm ptp pps_core wmi fjes video [ 259.551889] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.5.0-040500-generic #201603140130 [ 259.551890] Hardware name: LENOVO 10A6A0J5IX/SHARKBAY, BIOS FBKT79AUS 04/17/2014 [ 259.551891] 0000000000000286 108c91d75cf5b65f ffff88021eb03d98 ffffffff813e0233 [ 259.551893] ffff88021eb03de0 ffffffff81d816a0 ffff88021eb03dd0 ffffffff81080e72 [ 259.551894] 0000000000000000 ffff8800cee81880 0000000000000002 ffff8800a19f8000 [ 259.551895] Call Trace: [ 259.551896] <IRQ> [<ffffffff813e0233>] dump_stack+0x63/0x90 [ 259.551903] [<ffffffff81080e72>] warn_slowpath_common+0x82/0xc0 [ 259.551904] [<ffffffff81080f0c>] warn_slowpath_fmt+0x5c/0x80 [ 259.551907] [<ffffffff8173f557>] dev_watchdog+0x237/0x240 [ 259.551909] [<ffffffff8173f320>] ? qdisc_rcu_free+0x40/0x40 [ 259.551910] [<ffffffff810ecc75>] call_timer_fn+0x35/0x120 [ 259.551911] [<ffffffff8173f320>] ? qdisc_rcu_free+0x40/0x40 [ 259.551912] [<ffffffff810ed626>] run_timer_softirq+0x246/0x2f0 [ 259.551914] [<ffffffff81085836>] __do_softirq+0xf6/0x280 [ 259.551916] [<ffffffff81085b33>] irq_exit+0xa3/0xb0 [ 259.551919] [<ffffffff81826092>] smp_apic_timer_interrupt+0x42/0x50 [ 259.551920] [<ffffffff81824362>] apic_timer_interrupt+0x82/0x90 [ 259.551922] <EOI> [<ffffffff816b669d>] ? cpuidle_enter_state+0x11d/0x2c0 [ 259.551925] [<ffffffff816b6877>] cpuidle_enter+0x17/0x20 [ 259.551928] [<ffffffff810c413a>] call_cpuidle+0x2a/0x40 [ 259.551929] [<ffffffff810c4505>] cpu_startup_entry+0x295/0x350 [ 259.551931] [<ffffffff81050d9e>] start_secondary+0x15e/0x190 [ 259.551933] ---[ end trace 6f8d3c1a1b02644d ]--- but this is probably something different, cause with v4.16 data connection works fine. If this is not helpful I guess I need to bisect. Thanks, Daniele >> I ask, as my mobile provider does horrible things to large packet sizes. >> So much so that I have to set the mtu to 1280 just to get things to work >> properly when tethering my phone through to my laptop. So this might be >> a network provider issue :) >> > > Yeah, I thought the same, so I tried the same scenario with Windows 10 > but it is working fine. > > Thanks, > Daniele > >> thanks, >> >> greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
