Thanks Eric, I will look into it Cheers Dreyfuss -----Original Message----- From: Eric Biggers [mailto:ebiggers3@xxxxxxxxx] Sent: Tuesday, May 22, 2018 7:59 AM To: Dreyfuss, Haim <haim.dreyfuss@xxxxxxxxx> Cc: linuxwifi <linuxwifi@xxxxxxxxx>; linux-wireless@xxxxxxxxxxxxxxx; Coelho, Luciano <luciano.coelho@xxxxxxxxx>; Kalle Valo <kvalo@xxxxxxxxxxxxxx> Subject: Re: [4.17 iwlwifi regression] NULL pointer dereference in reg_query_regdb_wmm() On Mon, May 21, 2018 at 09:47:12PM -0700, Eric Biggers wrote: > Hi Haim, > > On Mon, May 21, 2018 at 10:10:09AM +0000, Dreyfuss, Haim wrote: > > Hello, > > > > Can you provide the following information? > > 1. The *boot* you mentioned is from clean shutdown or from Sx state? > > 2. Do you know which MCC the driver is trying to update? > > I will appreciate if you could reproduce it with trace-cmd (recording at least iwlwifi , iwlwifi_msg -and iwlwifi_ucode) > > Or if you can't, just send dmesg but make sure to set iwlwifi.debug in the kernel parameters to 0x4000 > > > > It's a clean boot, from powered off. > > I built an v4.17-rc6 kernel with CONFIG_IWLWIFI_DEBUG=y and booted with > iwlwifi.debug=0x4000. I've attached the dmesg output and kernel config. > > The crash happens right away, so there's no time to easily run trace-cmd. > But if the other stuff still isn't enough, I can try booting with the > NetworkManager service disabled, then enabling it at runtime. > > - Eric The crash goes away if I replace iwlwifi-7265D-27.ucode in CONFIG_EXTRA_FIRMWARE with iwlwifi-7265D-29.ucode. I don't know how well supported using old iwlwifi firmware versions is supposed to be, but it shouldn't crash the kernel. - Eric
