* Re: "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 [not found] <e2d89c7d-7567-c3ac-505e-7a9aa887c158@nurealm.net> @ 2016-05-19 22:56 ` Bob Copeland 2016-05-20 15:39 ` Larry Finger 0 siblings, 1 reply; 4+ messages in thread From: Bob Copeland @ 2016-05-19 22:56 UTC (permalink / raw) To: James Feeney; +Cc: hostap, linux-wireless +linux-wireless On Thu, May 19, 2016 at 03:11:16PM -0600, James Feeney wrote: > Arch linux 4.6-1 > wpa_supplicant 1:2.5-3 > Toshiba Satellite, circa 2011, with a Pentium Dual-Core Mobile > Error is not seen on other machines. > > kernel: BUG: scheduling while atomic: wpa_supplicant/375/0x00000002 This is a kernel bug, not a wpa_supplicant bug. The linux-wireless mailing list would be a more appropriate venue for this bug report. > May 19 10:26:07 lapis kernel: BUG: scheduling while atomic: wpa_supplicant/627/0x00000002 [...] > May 19 10:26:07 lapis kernel: [<ffffffff815c2b39>] __schedule+0x899/0xad0 > May 19 10:26:07 lapis kernel: [<ffffffff815c2dac>] schedule+0x3c/0x90 > May 19 10:26:07 lapis kernel: [<ffffffff815c5bb2>] schedule_hrtimeout_range_clock+0xa2/0x120 > May 19 10:26:07 lapis kernel: [<ffffffff810e8b80>] ? hrtimer_init+0x120/0x120 > May 19 10:26:07 lapis kernel: [<ffffffff815c5ba6>] ? schedule_hrtimeout_range_clock+0x96/0x120 > May 19 10:26:07 lapis kernel: [<ffffffff815c5c43>] schedule_hrtimeout_range+0x13/0x20 > May 19 10:26:07 lapis kernel: [<ffffffff815c568f>] usleep_range+0x4f/0x70 > May 19 10:26:07 lapis kernel: [<ffffffffa0667218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] > May 19 10:26:07 lapis kernel: [<ffffffffa06dd0e7>] rtl92c_phy_config_rf_with_headerfile+0xc7/0xe0 [rtl8192ce] [Probably due to this kernel change: commit 49f86ec21c01b654f6ec47f2f4567f4f9ebaa26b Author: Larry Finger <Larry.Finger@lwfinger.net> Date: Mon Feb 15 16:12:07 2016 -0600 rtlwifi: Change long delays to sleeps ...apparently this function isn't in sleepable context after all.] -- Bob Copeland %% http://bobcopeland.com/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 2016-05-19 22:56 ` "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 Bob Copeland @ 2016-05-20 15:39 ` Larry Finger 2016-05-23 17:29 ` James Feeney 0 siblings, 1 reply; 4+ messages in thread From: Larry Finger @ 2016-05-20 15:39 UTC (permalink / raw) To: Bob Copeland, James Feeney; +Cc: hostap, linux-wireless [-- Attachment #1: Type: text/plain, Size: 1940 bytes --] On 05/19/2016 05:56 PM, Bob Copeland wrote: > +linux-wireless > > On Thu, May 19, 2016 at 03:11:16PM -0600, James Feeney wrote: >> Arch linux 4.6-1 >> wpa_supplicant 1:2.5-3 >> Toshiba Satellite, circa 2011, with a Pentium Dual-Core Mobile >> Error is not seen on other machines. >> >> kernel: BUG: scheduling while atomic: wpa_supplicant/375/0x00000002 > > This is a kernel bug, not a wpa_supplicant bug. The linux-wireless mailing > list would be a more appropriate venue for this bug report. > > >> May 19 10:26:07 lapis kernel: BUG: scheduling while atomic: wpa_supplicant/627/0x00000002 > [...] >> May 19 10:26:07 lapis kernel: [<ffffffff815c2b39>] __schedule+0x899/0xad0 >> May 19 10:26:07 lapis kernel: [<ffffffff815c2dac>] schedule+0x3c/0x90 >> May 19 10:26:07 lapis kernel: [<ffffffff815c5bb2>] schedule_hrtimeout_range_clock+0xa2/0x120 >> May 19 10:26:07 lapis kernel: [<ffffffff810e8b80>] ? hrtimer_init+0x120/0x120 >> May 19 10:26:07 lapis kernel: [<ffffffff815c5ba6>] ? schedule_hrtimeout_range_clock+0x96/0x120 >> May 19 10:26:07 lapis kernel: [<ffffffff815c5c43>] schedule_hrtimeout_range+0x13/0x20 >> May 19 10:26:07 lapis kernel: [<ffffffff815c568f>] usleep_range+0x4f/0x70 >> May 19 10:26:07 lapis kernel: [<ffffffffa0667218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] >> May 19 10:26:07 lapis kernel: [<ffffffffa06dd0e7>] rtl92c_phy_config_rf_with_headerfile+0xc7/0xe0 [rtl8192ce] > > [Probably due to this kernel change: > > commit 49f86ec21c01b654f6ec47f2f4567f4f9ebaa26b > Author: Larry Finger <Larry.Finger@lwfinger.net> > Date: Mon Feb 15 16:12:07 2016 -0600 > > rtlwifi: Change long delays to sleeps > > > ...apparently this function isn't in sleepable context after all.] > @James: Please run the command "dmesg | grep rtl_rfreg_delay". Do any of the resulting lines show a value other than "+0x38" for the offset? If that is the only one, the attached patch should fix the problem. Thanks, Larry [-- Attachment #2: patch_schedule_while_atomic.patch --] [-- Type: text/x-patch, Size: 740 bytes --] diff --git a/Makefile b/Makefile index 0f9cb36..080962b 100644 --- a/Makefile +++ b/Makefile @@ -1,7 +1,7 @@ VERSION = 4 -PATCHLEVEL = 6 +PATCHLEVEL = 7 SUBLEVEL = 0 -EXTRAVERSION = +EXTRAVERSION = rc1 NAME = Charred Weasel # *DOCUMENTATION* diff --git a/drivers/net/wireless/realtek/rtlwifi/core.c b/drivers/net/wireless/realtek/rtlwifi/core.c index 0f48048..2fc0e26 100644 --- a/drivers/net/wireless/realtek/rtlwifi/core.c +++ b/drivers/net/wireless/realtek/rtlwifi/core.c @@ -75,7 +75,7 @@ void rtl_rfreg_delay(struct ieee80211_hw *hw, enum radio_path rfpath, u32 addr, rtl_addr_delay(addr); } else { rtl_set_rfreg(hw, rfpath, addr, mask, data); - usleep_range(1, 2); + udelay(1); } } EXPORT_SYMBOL(rtl_rfreg_delay); ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 2016-05-20 15:39 ` Larry Finger @ 2016-05-23 17:29 ` James Feeney 2016-05-23 17:48 ` Larry Finger 0 siblings, 1 reply; 4+ messages in thread From: James Feeney @ 2016-05-23 17:29 UTC (permalink / raw) To: Larry Finger, Bob Copeland; +Cc: hostap, linux-wireless On 05/20/2016 09:39 AM, Larry Finger wrote: > @James: Please run the command "dmesg | grep rtl_rfreg_delay". Do any of the > resulting lines show a value other than "+0x38" for the offset? If that is the > only one, the attached patch should fix the problem. Sorry about the delayed response. $ dmesg | grep rtl_rfreg_delay [ 15.936262] [<ffffffffa06b1218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] [ 348.735402] [<ffffffffa06b1218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] So that looks like a no, just the "+0x38" for the offset. Thanks James ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 2016-05-23 17:29 ` James Feeney @ 2016-05-23 17:48 ` Larry Finger 0 siblings, 0 replies; 4+ messages in thread From: Larry Finger @ 2016-05-23 17:48 UTC (permalink / raw) To: james, Bob Copeland; +Cc: hostap, linux-wireless On 05/23/2016 12:29 PM, James Feeney wrote: > On 05/20/2016 09:39 AM, Larry Finger wrote: >> @James: Please run the command "dmesg | grep rtl_rfreg_delay". Do any of the >> resulting lines show a value other than "+0x38" for the offset? If that is the >> only one, the attached patch should fix the problem. > > Sorry about the delayed response. > > $ dmesg | grep rtl_rfreg_delay > [ 15.936262] [<ffffffffa06b1218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] > [ 348.735402] [<ffffffffa06b1218>] rtl_rfreg_delay+0x38/0x50 [rtlwifi] > > So that looks like a no, just the "+0x38" for the offset. I was able to duplicate the BUG and have submitted a patch. I think you were in the Cc list. The patch will appear sometime in the 4.7-rcX series, and will be ported to kernel 4.6 once it appears in the mainline repo. Larry ^ permalink raw reply [flat|nested] 4+ messages in thread
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2016-05-19 22:56 ` "kernel: BUG: scheduling while atomic:" errors with linux kernel 4.6 Bob Copeland
2016-05-20 15:39 ` Larry Finger
2016-05-23 17:29 ` James Feeney
2016-05-23 17:48 ` Larry Finger
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