Re: PROBLEM: Boot failure with bad RIP value
On Fri, Oct 31, 2014 at 10:07:59AM -0500, Larry Finger wrote: > On 10/31/2014 08:56 AM, S. Gilles wrote: > >> 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. > >> RTL8188CE 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) > > > > Any progress on this, or duplication? If this isn't replicable with > > the information in Bugzilla, I can provide anything requested. > > Thanks for posting the PCI ID. I am currently on a family vacation, and I > have > had little time for driver problems, and none for chasing missing information. My apologies, I didn't realize you were still away. > The attached patches should fix the kernel crashes; however, I doubt that the > driver will work. There seems to be a problem with DMA buffers that I have > not > had time to find. For the sake of followp, I can confirm on my machine: the boot is fine but no /dev/wlan0. Thanks for the patches, I'll remain available to test any more if needed. -- S. Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: PROBLEM: Boot failure with bad RIP value
On 10/31/2014 08:56 AM, S. Gilles wrote: 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) Any progress on this, or duplication? If this isn't replicable with the information in Bugzilla, I can provide anything requested. Thanks for posting the PCI ID. I am currently on a family vacation, and I have had little time for driver problems, and none for chasing missing information. The attached patches should fix the kernel crashes; however, I doubt that the driver will work. There seems to be a problem with DMA buffers that I have not had time to find. Larry >From bbaf5c9fc3bf1cf30576b546988e4e33cbd9c4a5 Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Sat, 25 Oct 2014 23:39:08 -0500 Subject: [PATCH 2/7] rtlwifi: rtl8192ce: rtl8192de: rtl8192se: Fix handling for missing get_btc_status To: linvi...@tuxdriver.com Cc: net...@vger.kernel.org, troy_...@realsil.com.cn The recent changes in checking for Bluetooth status added some callbacks to code in rtlwifi. To make certain that all callbacks are defined, a dummy routine has been added to rtlwifi, and the drivers that need to use it are modified. Signed-off-by: Larry Finger --- drivers/net/wireless/rtlwifi/core.c | 6 ++ drivers/net/wireless/rtlwifi/core.h | 1 + drivers/net/wireless/rtlwifi/rtl8192ce/sw.c | 1 + drivers/net/wireless/rtlwifi/rtl8192de/sw.c | 1 + drivers/net/wireless/rtlwifi/rtl8192se/sw.c | 1 + 5 files changed, 10 insertions(+) diff --git a/drivers/net/wireless/rtlwifi/core.c b/drivers/net/wireless/rtlwifi/core.c index f6179bc..07dae0d 100644 --- a/drivers/net/wireless/rtlwifi/core.c +++ b/drivers/net/wireless/rtlwifi/core.c @@ -1828,3 +1828,9 @@ const struct ieee80211_ops rtl_ops = { .flush = rtl_op_flush, }; EXPORT_SYMBOL_GPL(rtl_ops); + +bool rtl_btc_status_false(void) +{ + return false; +} +EXPORT_SYMBOL_GPL(rtl_btc_status_false); diff --git a/drivers/net/wireless/rtlwifi/core.h b/drivers/net/wireless/rtlwifi/core.h index 59cd3b9..624e1dc 100644 --- a/drivers/net/wireless/rtlwifi/core.h +++ b/drivers/net/wireless/rtlwifi/core.h @@ -42,5 +42,6 @@ void rtl_rfreg_delay(struct ieee80211_hw *hw, enum radio_path rfpath, u32 addr, u32 mask, u32 data); void rtl_bb_delay(struct ieee80211_hw *hw, u32 addr, u32 data); bool rtl_cmd_send_packet(struct ieee80211_hw *hw, struct sk_buff *skb); +bool rtl_btc_status_false(void); #endif diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c index d86b5b5..46ea076 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c @@ -244,6 +244,7 @@ static struct rtl_hal_ops rtl8192ce_hal_ops = { .phy_lc_calibrate = _rtl92ce_phy_lc_calibrate, .phy_set_bw_mode_callback = rtl92ce_phy_set_bw_mode_callback, .dm_dynamic_txpower = rtl92ce_dm_dynamic_txpower, + .get_btc_status = rtl_btc_status_false, }; static struct rtl_mod_params rtl92ce_mod_params = { diff --git a/drivers/net/wireless/rtlwifi/rtl8192de/sw.c b/drivers/net/wireless/rtlwifi/rtl8192de/sw.c index edab5a5..a0aba08 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192de/sw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192de/sw.c @@ -251,6 +251,7 @@ static struct rtl_hal_ops rtl8192de_hal_ops = { .get_rfreg = rtl92d_phy_query_rf_reg, .set_rfreg = rtl92d_phy_set_rf_reg, .linked_set_reg = rtl92d_linked_set_reg, + .get_btc_status = rtl_btc_status_false, }; static struct rtl_mod_params rtl92de_mod_params = { diff --git a/drivers/net/wireless/rtlwifi/rtl8192se/sw.c b/drivers/net/wireless/rtlwifi/rtl8192se/sw.c index 1bff2a0..5e16984 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192se/sw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192se/sw.c @@ -294,6 +294,7 @@ static struct rtl_hal_ops rtl8192se_hal_ops = { .set_bbreg = rtl92s_phy_set_bb_reg, .get_rfreg = rtl92s_phy_query_rf_reg, .set_rfreg = rtl92s_phy_set_rf_reg, + .get_btc_status = rtl_btc_status_false, }; static struct rtl_mod_params rtl92se_mod_params = { -- 2.1.1 >From 4f3d6a80198c539bbf200ff3a6dd00689b50bf78 Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Sat, 25 Oct 2014 23:51:15 -0500 Subject: [PATCH 5/7] rtlwifi: rtl8192ce: Add missing section to read descriptor setting To: linvi...@tuxdriver.com Cc: net...@vger.kernel.org, troy_...@realsil.com.cn The new version of rtlwifi needs code in rtl92ce_get_desc() that returns the buffer address for read operations. Signed-off-by: Larry Finger --- drivers/net/wireless/rtlwifi/rtl8192ce/def.h | 2 ++ drivers/net/wireless/rtlwifi/rtl8192ce/trx.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/def.h b/drivers/net/wireless/rtlwifi/rtl8192ce/def.h index 831df10..9b660df 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192ce/def.h +++ b/drivers/net/wireless/rtlwifi/rtl8192ce/def.h @@ -114,6 +114,8 @@ LE_BITS_TO_4BYTE(((__pcmdfbhdr) + 4), 16, 4) #define GET_C2H_CMD_F
Re: PROBLEM: Boot failure with bad RIP value
On Tue, Oct 14, 2014 at 12:13:13AM -0400, S. Gilles wrote: > On Mon, Oct 13, 2014 at 10:41:26PM -0500, Larry Finger wrote: > > On 10/13/2014 06:45 PM, S. Gilles wrote: > > > (Sending this to the right people this time, hopefully.) > > > > > > I have been getting a consistent boot failure with 3.17, which I have > > > bisected to > > > > > > 38506ecefab911785d5e1aa5889f6eeb462e0954 is the first bad commit > > > commit 38506ecefab911785d5e1aa5889f6eeb462e0954 > > > Author: Larry Finger > > > Date: Mon Sep 22 09:39:19 2014 -0500 > > > > > > rtlwifi: rtl_pci: Start modification for new drivers > > > > > > Future patches will move the drivers for RTL8192EE and RTL8821AE > > > from staging to the regular wireless tree. Here, the necessary > > > features > > > are added to the PCI driver. Other files are touched due to changes > > > in the various data structs. > > > > > > Signed-off-by: Larry Finger > > > Signed-off-by: John W. Linville > > > > > > The end of the trace (hand-retyped, so there may be errors that > > > escaped me): > > > > > > R10: 825f2d80 R11: R12: 8800b4f107c0 > > > R13: 8800b4f124b8 R14: 1000 R15: 8800b4c7a000 > > > FS: 07fc66c938700() GS:88013e20() > > > knlGS: > > > CS: 0010 DS: ES: CR0: 80050033 > > > CR2: CR3: b5438000 CR4: 000407f0 > > > Stack: > > > a01e20d6 8800b4f12420 8800b4f107c0 880137d7fcd0 > > > a01c97b5 8800b4f107c0 8800b4c7a8d0 > > > 880137d7fd30 81577304 8800b4c7a8c0 > > > Call Trace: > > > [] ? rtl_pci_start+0x2b/0x15f [rtl_pci] > > > [] rtl_op_start+0x45/0x64 [rtlwifi] > > > [] ieee80211_do_open+0x152/0xb4b > > > [] ? mutex_unlock+0x9/0xb > > > [] ieee80211_open+0x4d/0x57 > > > [] __dev_open+0x8b/0xcb > > > [] __dev_change_flags+0xa4/0x13a > > > [] dev_change_flags+0x20/0x53 > > > [] devinet_ioctl+0x269/0x568 > > > [] inet_ioctl+0x81/0x9e > > > [] sock_do_ioctl+0x20/0x3d > > > [] sock_ioctl+0x20e/0x21a > > > [] do_vfs_ioctl+0x39e/0x467 > > > [] ? sysret_check+0x1b/0x56 > > > [] ? trace_hardirqs_on_caller+0x16e/0x18a > > > [] SyS_ioctl+0x38/0x5f > > > [] system_call_fastpath+0x16/0x1b > > > Code: Bad RIP value. > > > RIP [< (null)>] (null) > > > RSP > > > CR2: > > > ---[ end trace 7307d2524c1e640b ]--- > > > > > > This is extremely easy to test (boot) and seems 100% reproducible. > > > > > > I have submitted Bug 86211 - Boot failure: Bad RIP value for rtl8192ce > > > for this issue. > > > > I am traveling and it may be a few days before I am able to make a suitable > > test. In the meantime, please post the appropriate stanza for the Realtek > > device > > from the output of > > > > lspci -nn > > > > There are several different devices that use driver rtl8192ce, and I need > > to > > know which one you have so that I can duplicate the problem. > > Of course - I definitely should have mentioned that. > > $ lspci -nn | grep RTL > 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE > 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) Any progress on this, or duplication? If this isn't replicable with the information in Bugzilla, I can provide anything requested. -- S. Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: PROBLEM: Boot failure with bad RIP value
On Tue, Oct 14, 2014 at 12:13:13AM -0400, S. Gilles wrote: > On Mon, Oct 13, 2014 at 10:41:26PM -0500, Larry Finger wrote: > > On 10/13/2014 06:45 PM, S. Gilles wrote: > > > (Sending this to the right people this time, hopefully.) > > > > > > I have been getting a consistent boot failure with 3.17, which I have > > > bisected to > > > > > > 38506ecefab911785d5e1aa5889f6eeb462e0954 is the first bad commit > > > commit 38506ecefab911785d5e1aa5889f6eeb462e0954 > > > Author: Larry Finger > > > Date: Mon Sep 22 09:39:19 2014 -0500 > > > > > > rtlwifi: rtl_pci: Start modification for new drivers > > > > > > Future patches will move the drivers for RTL8192EE and RTL8821AE > > > from staging to the regular wireless tree. Here, the necessary > > > features > > > are added to the PCI driver. Other files are touched due to changes > > > in the various data structs. > > > > > > Signed-off-by: Larry Finger > > > Signed-off-by: John W. Linville > > > > > > The end of the trace (hand-retyped, so there may be errors that > > > escaped me): > > > > > > R10: 825f2d80 R11: R12: 8800b4f107c0 > > > R13: 8800b4f124b8 R14: 1000 R15: 8800b4c7a000 > > > FS: 07fc66c938700() GS:88013e20() > > > knlGS: > > > CS: 0010 DS: ES: CR0: 80050033 > > > CR2: CR3: b5438000 CR4: 000407f0 > > > Stack: > > > a01e20d6 8800b4f12420 8800b4f107c0 880137d7fcd0 > > > a01c97b5 8800b4f107c0 8800b4c7a8d0 > > > 880137d7fd30 81577304 8800b4c7a8c0 > > > Call Trace: > > > [] ? rtl_pci_start+0x2b/0x15f [rtl_pci] > > > [] rtl_op_start+0x45/0x64 [rtlwifi] > > > [] ieee80211_do_open+0x152/0xb4b > > > [] ? mutex_unlock+0x9/0xb > > > [] ieee80211_open+0x4d/0x57 > > > [] __dev_open+0x8b/0xcb > > > [] __dev_change_flags+0xa4/0x13a > > > [] dev_change_flags+0x20/0x53 > > > [] devinet_ioctl+0x269/0x568 > > > [] inet_ioctl+0x81/0x9e > > > [] sock_do_ioctl+0x20/0x3d > > > [] sock_ioctl+0x20e/0x21a > > > [] do_vfs_ioctl+0x39e/0x467 > > > [] ? sysret_check+0x1b/0x56 > > > [] ? trace_hardirqs_on_caller+0x16e/0x18a > > > [] SyS_ioctl+0x38/0x5f > > > [] system_call_fastpath+0x16/0x1b > > > Code: Bad RIP value. > > > RIP [< (null)>] (null) > > > RSP > > > CR2: > > > ---[ end trace 7307d2524c1e640b ]--- > > > > > > This is extremely easy to test (boot) and seems 100% reproducible. > > > > > > I have submitted Bug 86211 - Boot failure: Bad RIP value for rtl8192ce > > > for this issue. > > > > I am traveling and it may be a few days before I am able to make a suitable > > test. In the meantime, please post the appropriate stanza for the Realtek > > device > > from the output of > > > > lspci -nn > > > > There are several different devices that use driver rtl8192ce, and I need > > to > > know which one you have so that I can duplicate the problem. > > Of course - I definitely should have mentioned that. > > $ lspci -nn | grep RTL > 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE > 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) Ping for this, just to make sure it doesn't fall off the radar. -- S. Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: PROBLEM: Boot failure with bad RIP value
On Mon, Oct 13, 2014 at 10:41:26PM -0500, Larry Finger wrote: > On 10/13/2014 06:45 PM, S. Gilles wrote: > > (Sending this to the right people this time, hopefully.) > > > > I have been getting a consistent boot failure with 3.17, which I have > > bisected to > > > > 38506ecefab911785d5e1aa5889f6eeb462e0954 is the first bad commit > > commit 38506ecefab911785d5e1aa5889f6eeb462e0954 > > Author: Larry Finger > > Date: Mon Sep 22 09:39:19 2014 -0500 > > > > rtlwifi: rtl_pci: Start modification for new drivers > > > > Future patches will move the drivers for RTL8192EE and RTL8821AE > > from staging to the regular wireless tree. Here, the necessary features > > are added to the PCI driver. Other files are touched due to changes > > in the various data structs. > > > > Signed-off-by: Larry Finger > > Signed-off-by: John W. Linville > > > > The end of the trace (hand-retyped, so there may be errors that > > escaped me): > > > > R10: 825f2d80 R11: R12: 8800b4f107c0 > > R13: 8800b4f124b8 R14: 1000 R15: 8800b4c7a000 > > FS: 07fc66c938700() GS:88013e20() > > knlGS: > > CS: 0010 DS: ES: CR0: 80050033 > > CR2: CR3: b5438000 CR4: 000407f0 > > Stack: > > a01e20d6 8800b4f12420 8800b4f107c0 880137d7fcd0 > > a01c97b5 8800b4f107c0 8800b4c7a8d0 > > 880137d7fd30 81577304 8800b4c7a8c0 > > Call Trace: > > [] ? rtl_pci_start+0x2b/0x15f [rtl_pci] > > [] rtl_op_start+0x45/0x64 [rtlwifi] > > [] ieee80211_do_open+0x152/0xb4b > > [] ? mutex_unlock+0x9/0xb > > [] ieee80211_open+0x4d/0x57 > > [] __dev_open+0x8b/0xcb > > [] __dev_change_flags+0xa4/0x13a > > [] dev_change_flags+0x20/0x53 > > [] devinet_ioctl+0x269/0x568 > > [] inet_ioctl+0x81/0x9e > > [] sock_do_ioctl+0x20/0x3d > > [] sock_ioctl+0x20e/0x21a > > [] do_vfs_ioctl+0x39e/0x467 > > [] ? sysret_check+0x1b/0x56 > > [] ? trace_hardirqs_on_caller+0x16e/0x18a > > [] SyS_ioctl+0x38/0x5f > > [] system_call_fastpath+0x16/0x1b > > Code: Bad RIP value. > > RIP [< (null)>] (null) > > RSP > > CR2: > > ---[ end trace 7307d2524c1e640b ]--- > > > > This is extremely easy to test (boot) and seems 100% reproducible. > > > > I have submitted Bug 86211 - Boot failure: Bad RIP value for rtl8192ce > > for this issue. > > I am traveling and it may be a few days before I am able to make a suitable > test. In the meantime, please post the appropriate stanza for the Realtek > device > from the output of > > lspci -nn > > There are several different devices that use driver rtl8192ce, and I need to > know which one you have so that I can duplicate the problem. Of course - I definitely should have mentioned that. $ lspci -nn | grep RTL 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) -- S. Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: PROBLEM: Boot failure with bad RIP value
On 10/13/2014 06:45 PM, S. Gilles wrote: (Sending this to the right people this time, hopefully.) I have been getting a consistent boot failure with 3.17, which I have bisected to 38506ecefab911785d5e1aa5889f6eeb462e0954 is the first bad commit commit 38506ecefab911785d5e1aa5889f6eeb462e0954 Author: Larry Finger Date: Mon Sep 22 09:39:19 2014 -0500 rtlwifi: rtl_pci: Start modification for new drivers Future patches will move the drivers for RTL8192EE and RTL8821AE from staging to the regular wireless tree. Here, the necessary features are added to the PCI driver. Other files are touched due to changes in the various data structs. Signed-off-by: Larry Finger Signed-off-by: John W. Linville The end of the trace (hand-retyped, so there may be errors that escaped me): R10: 825f2d80 R11: R12: 8800b4f107c0 R13: 8800b4f124b8 R14: 1000 R15: 8800b4c7a000 FS: 07fc66c938700() GS:88013e20() knlGS: CS: 0010 DS: ES: CR0: 80050033 CR2: CR3: b5438000 CR4: 000407f0 Stack: a01e20d6 8800b4f12420 8800b4f107c0 880137d7fcd0 a01c97b5 8800b4f107c0 8800b4c7a8d0 880137d7fd30 81577304 8800b4c7a8c0 Call Trace: [] ? rtl_pci_start+0x2b/0x15f [rtl_pci] [] rtl_op_start+0x45/0x64 [rtlwifi] [] ieee80211_do_open+0x152/0xb4b [] ? mutex_unlock+0x9/0xb [] ieee80211_open+0x4d/0x57 [] __dev_open+0x8b/0xcb [] __dev_change_flags+0xa4/0x13a [] dev_change_flags+0x20/0x53 [] devinet_ioctl+0x269/0x568 [] inet_ioctl+0x81/0x9e [] sock_do_ioctl+0x20/0x3d [] sock_ioctl+0x20e/0x21a [] do_vfs_ioctl+0x39e/0x467 [] ? sysret_check+0x1b/0x56 [] ? trace_hardirqs_on_caller+0x16e/0x18a [] SyS_ioctl+0x38/0x5f [] system_call_fastpath+0x16/0x1b Code: Bad RIP value. RIP [< (null)>] (null) RSP CR2: ---[ end trace 7307d2524c1e640b ]--- This is extremely easy to test (boot) and seems 100% reproducible. I have submitted Bug 86211 - Boot failure: Bad RIP value for rtl8192ce for this issue. I am traveling and it may be a few days before I am able to make a suitable test. In the meantime, please post the appropriate stanza for the Realtek device from the output of lspci -nn There are several different devices that use driver rtl8192ce, and I need to know which one you have so that I can duplicate the problem. Larry -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
PROBLEM: Boot failure with bad RIP value
(Sending this to the right people this time, hopefully.) I have been getting a consistent boot failure with 3.17, which I have bisected to 38506ecefab911785d5e1aa5889f6eeb462e0954 is the first bad commit commit 38506ecefab911785d5e1aa5889f6eeb462e0954 Author: Larry Finger Date: Mon Sep 22 09:39:19 2014 -0500 rtlwifi: rtl_pci: Start modification for new drivers Future patches will move the drivers for RTL8192EE and RTL8821AE from staging to the regular wireless tree. Here, the necessary features are added to the PCI driver. Other files are touched due to changes in the various data structs. Signed-off-by: Larry Finger Signed-off-by: John W. Linville The end of the trace (hand-retyped, so there may be errors that escaped me): R10: 825f2d80 R11: R12: 8800b4f107c0 R13: 8800b4f124b8 R14: 1000 R15: 8800b4c7a000 FS: 07fc66c938700() GS:88013e20() knlGS: CS: 0010 DS: ES: CR0: 80050033 CR2: CR3: b5438000 CR4: 000407f0 Stack: a01e20d6 8800b4f12420 8800b4f107c0 880137d7fcd0 a01c97b5 8800b4f107c0 8800b4c7a8d0 880137d7fd30 81577304 8800b4c7a8c0 Call Trace: [] ? rtl_pci_start+0x2b/0x15f [rtl_pci] [] rtl_op_start+0x45/0x64 [rtlwifi] [] ieee80211_do_open+0x152/0xb4b [] ? mutex_unlock+0x9/0xb [] ieee80211_open+0x4d/0x57 [] __dev_open+0x8b/0xcb [] __dev_change_flags+0xa4/0x13a [] dev_change_flags+0x20/0x53 [] devinet_ioctl+0x269/0x568 [] inet_ioctl+0x81/0x9e [] sock_do_ioctl+0x20/0x3d [] sock_ioctl+0x20e/0x21a [] do_vfs_ioctl+0x39e/0x467 [] ? sysret_check+0x1b/0x56 [] ? trace_hardirqs_on_caller+0x16e/0x18a [] SyS_ioctl+0x38/0x5f [] system_call_fastpath+0x16/0x1b Code: Bad RIP value. RIP [< (null)>] (null) RSP CR2: ---[ end trace 7307d2524c1e640b ]--- This is extremely easy to test (boot) and seems 100% reproducible. I have submitted Bug 86211 - Boot failure: Bad RIP value for rtl8192ce for this issue. Thanks, S. Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html