* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 [not found] <bug-10903-10286@http.bugzilla.kernel.org/> @ 2008-06-13 9:58 ` Andrew Morton 2008-06-14 20:45 ` Ilpo Järvinen 0 siblings, 1 reply; 15+ messages in thread From: Andrew Morton @ 2008-06-13 9:58 UTC (permalink / raw) To: netdev; +Cc: bugme-daemon, didier (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > Summary: ssh connections hang with 2.6.26-rc5 > Product: Networking > Version: 2.5 > KernelVersion: 2.6.26-rc5 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Other > AssignedTo: acme@ghostprotocols.net > ReportedBy: didier@raboud.com > > > Latest working kernel version: 2.6.25-2 > Earliest failing kernel version: 2.6.26-rc5 > Distribution: Debian (Lenny + Sid) > Hardware Environment: amd64 (Dell Latitude D630) > Software Environment: KDE > Problem Description: > > With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly > hang (no error message). No amelioration despite the activation of > "ServerAliveInterval" on both sides. > > Steps to reproduce: > > Connect to a remote ssh server and do some stuff. After some time, the > connection will hang. > > Please ask for details. > ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 2008-06-13 9:58 ` [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 Andrew Morton @ 2008-06-14 20:45 ` Ilpo Järvinen 2008-06-15 13:37 ` Didier Raboud 0 siblings, 1 reply; 15+ messages in thread From: Ilpo Järvinen @ 2008-06-14 20:45 UTC (permalink / raw) To: Andrew Morton; +Cc: Netdev, bugme-daemon, didier On Fri, 13 Jun 2008, Andrew Morton wrote: > > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote: > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > Summary: ssh connections hang with 2.6.26-rc5 > > Product: Networking > > Version: 2.5 > > KernelVersion: 2.6.26-rc5 > > Platform: All > > OS/Version: Linux > > Tree: Mainline > > Status: NEW > > Severity: normal > > Priority: P1 > > Component: Other > > AssignedTo: acme@ghostprotocols.net > > ReportedBy: didier@raboud.com > > > > > > Latest working kernel version: 2.6.25-2 > > Earliest failing kernel version: 2.6.26-rc5 > > Distribution: Debian (Lenny + Sid) > > Hardware Environment: amd64 (Dell Latitude D630) > > Software Environment: KDE > > Problem Description: > > > > With kernel version 2.6.26-rc5, the ssh connections to remote servers > > randomly > > hang (no error message). No amelioration despite the activation of > > "ServerAliveInterval" on both sides. Thanks for reporting. Could you please clarify couple of things: Does this only happen with a particular server/servers? Any middleboxes in between (NAT, firewall, etc.)? Do all ssh connections hang simultaneously? How long have you waited until concluding that TCP is "hung"? Is TSO enabled (ethtool -k)? Have you tried without it? It wouldn't hurt to include info about eth hw too (e.g., lspci), though it might turn unneeded at some point of time but it might save an email round-trip. TCP can appear to hang due to vast number of reasons. Only recent changes that are suspectable is the DEFERRED_ACCEPT thing which is already reverted in the very latest Linus' tree (even -rc6 is too old for that) and few FRTO fixes (you can exclude FRTO by turning /proc/sys/net/ipv4/tcp_frto sysctl to 0 but it seems quite unlikely to change anything); your problem might well come from something else and TCP hang is just a symptom of other problem downstream. So please gather this information (at least for the relevant connections): $ netstat -pn $ cat /proc/net/tcp ...Also a tcpdump might be handy (though I don't know yet). ...Depending on your privacy needs, you may want obfuscate ip addresses that are revealed by all of those logs (ie., if you don't want to reveal with whom you're communicating with, ssh payload is encrypted anyway). > > Steps to reproduce: > > > > Connect to a remote ssh server and do some stuff. After some time, the > > connection will hang. > > > > Please ask for details. (I'll be away nearly a month after Tuesday, so I probably won't have much time to resolve this issue but I hope I've some time to take a look before I leave). -- i. ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 2008-06-14 20:45 ` Ilpo Järvinen @ 2008-06-15 13:37 ` Didier Raboud 2008-06-16 13:21 ` Ilpo Järvinen 0 siblings, 1 reply; 15+ messages in thread From: Didier Raboud @ 2008-06-15 13:37 UTC (permalink / raw) To: Ilpo Järvinen; +Cc: Andrew Morton, Netdev, bugme-daemon [-- Attachment #1.1: Type: text/plain, Size: 4859 bytes --] Le samedi 14 juin 2008 22:45:41 Ilpo Järvinen, vous avez écrit : > On Fri, 13 Jun 2008, Andrew Morton wrote: > > (switched to email. Please respond via emailed reply-to-all, not via the > > bugzilla web interface). OK. > > On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote: > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > > Product: Networking > > > Version: 2.5 > > > KernelVersion: 2.6.26-rc5 > > > Platform: All > > > OS/Version: Linux > > > Tree: Mainline > > > Status: NEW > > > Severity: normal > > > Priority: P1 > > > Component: Other > > > AssignedTo: acme@ghostprotocols.net > > > ReportedBy: didier@raboud.com > > > > > > > > > Latest working kernel version: 2.6.25-2 > > > Earliest failing kernel version: 2.6.26-rc5 > > > Distribution: Debian (Lenny + Sid) > > > Hardware Environment: amd64 (Dell Latitude D630) > > > Software Environment: KDE > > > Problem Description: > > > > > > With kernel version 2.6.26-rc5, the ssh connections to remote servers > > > randomly > > > hang (no error message). No amelioration despite the activation of > > > "ServerAliveInterval" on both sides. > > Thanks for reporting. Could you please clarify couple of things: Hi. I will try to, with my time and knowledge. > Does this only happen with a particular server/servers? I have only tried with two of my home servers. One runs 2.6.22-4-686 and the other 2.6.18-6-vserver-686. > Any middleboxes in between (NAT, firewall, etc.)? There is a ADSL router which "provides" internet to the servers by NAT. I have tried from "inside" the house (so in the same subnet) and from outside: it hangs in both cases. The common point is my use of "iwl3945" : I have always tried the ssh connections through WiFi. > Do all ssh connections hang simultaneously? Well... It is hard to say. As far as I have seen, no. When I get one hang, I can successfully connect to the same server. > How long have you waited until concluding that TCP is "hung"? Well. The "ServerAliveInterval" option of openssh now leads to "Received disconnect from $IP: 2: Timeout, your session not responding." after the hang. So the openssh server notices that my session is not responding and so cuts the connection. > Is TSO enabled (ethtool -k)? Have you tried without it? Doesn't seem: ---- # ethtool -k wlan0 Offload parameters for wlan0: Cannot get device rx csum settings: Operation not supported Cannot get device tx csum settings: Operation not supported Cannot get device scatter-gather settings: Operation not supported Cannot get device tcp segmentation offload settings: Operation not supported Cannot get device udp large send offload settings: Operation not supported Cannot get device generic segmentation offload settings: Operation not supported no offload info available ---- > It wouldn't hurt to include info about eth hw too (e.g., lspci), though > it might turn unneeded at some point of time but it might save an email > round-trip. lspci attached. > TCP can appear to hang due to vast number of reasons. Only recent changes > that are suspectable is the DEFERRED_ACCEPT thing which is already > reverted in the very latest Linus' tree (even -rc6 is too old for that) > and few FRTO fixes (you can exclude FRTO by turning > /proc/sys/net/ipv4/tcp_frto sysctl to 0 but it seems quite unlikely to > change anything); your problem might well come from something else and TCP > hang is just a symptom of other problem downstream. I can't understand everything, but what I can say is that with the exact same software, I get no hangs with 2.6.25-2 but I get some with 2.6.26-rc5. > So please gather this information (at least for the relevant connections): > > $ netstat -pn > $ cat /proc/net/tcp Attached. > ...Also a tcpdump might be handy (though I don't know yet). Well. It seems that there is another bug here: everytime I tried a # tcpdump -w /tmp/tcpdump.wlan0 -i wlan0 I got a CPU lockup (or similar, can't know exactly, but keyboard blocked and nothing doable). > ...Depending on your privacy needs, you may want obfuscate ip addresses > that are revealed by all of those logs (ie., if you don't want to reveal > with whom you're communicating with, ssh payload is encrypted anyway). > > (...) > > (I'll be away nearly a month after Tuesday, so I probably won't have much > time to resolve this issue but I hope I've some time to take a look before > I leave). We'll see ;) Regards, OdyX -- Didier Raboud, proud Debian user. CH-1802 Corseaux didier@raboud.com [-- Attachment #1.2: lspci --] [-- Type: text/plain, Size: 2106 bytes --] 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c) 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02) 00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2) 00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02) 03:01.0 CardBus bridge: O2 Micro, Inc. Cardbus bridge (rev 21) 03:01.4 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02) 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5755M Gigabit Ethernet PCI Express (rev 02) 0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02) [-- Attachment #1.3: netstat_-pn --] [-- Type: text/plain, Size: 31425 bytes --] Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 192.168.1.11:57063 128.178.222.18:143 ESTABLISHED 11314/klauncher0EyU tcp 0 0 192.168.1.11:54596 192.168.1.3:9000 ESTABLISHED 11125/klauncher0EyU tcp 0 0 192.168.1.11:54591 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54587 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54589 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54583 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54584 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:47334 217.150.254.106:5223 ESTABLISHED 4437/kopete tcp 0 0 192.168.1.11:54593 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:36357 192.168.1.2:22 TIME_WAIT - tcp 0 0 192.168.1.11:54592 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54588 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:53858 195.144.11.40:143 ESTABLISHED 4799/klauncher0EyU tcp 0 0 192.168.1.11:54586 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54595 192.168.1.3:9000 ESTABLISHED 11129/klauncher0EyU tcp 0 0 192.168.1.11:38449 212.25.25.37:143 ESTABLISHED 4801/klauncher0EyU tcp 0 0 192.168.1.11:40539 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54590 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54594 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:33066 84.16.68.124:143 ESTABLISHED 4800/klauncher0EyU tcp 0 0 192.168.1.11:38525 192.168.1.3:22 ESTABLISHED 13828/ssh tcp 0 0 192.168.182.18:60514 213.134.45.154:443 ESTABLISHED 4666/klauncher0EyU tcp 0 0 192.168.1.11:54585 192.168.1.3:9000 TIME_WAIT - Active UNIX domain sockets (w/o servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 3 [ ] DGRAM 20699 - /var/run/wpa_supplicant/wlan0 unix 2 [ ] DGRAM 20625 - /var/run/wpa_supplicant-global unix 2 [ ] DGRAM 20701 - /var/run/NetworkManager/wpa_ctrl_3855-19 unix 2 [ ] DGRAM 3393 - @/org/kernel/udev/udevd unix 9 [ ] DGRAM 7553 - /dev/log unix 2 [ ] DGRAM 8303 - @/org/freedesktop/hal/udev_event unix 3 [ ] STREAM CONNECTED 41908 4366/klauncher [kde /tmp/ksocket-didier/klauncher0EyUjc.slave-socket unix 3 [ ] STREAM CONNECTED 41906 4808/klauncher0EyUj unix 3 [ ] STREAM CONNECTED 41564 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 41563 13658/klauncher0EyU unix 3 [ ] STREAM CONNECTED 41562 4467/kontact /tmp/ksocket-didier/kontact28e1Ub.slave-socket unix 3 [ ] STREAM CONNECTED 41560 13658/klauncher0EyU unix 3 [ ] STREAM CONNECTED 41552 4467/kontact /tmp/ksocket-didier/kontactxiTI2a.slave-socket unix 3 [ ] STREAM CONNECTED 41550 13657/klauncher0EyU unix 3 [ ] STREAM CONNECTED 38904 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 38903 13293/klauncher0EyU unix 3 [ ] STREAM CONNECTED 38902 4462/konqueror [kde /tmp/ksocket-didier/konqueroroMrdRa.slave-socket unix 3 [ ] STREAM CONNECTED 38900 13293/klauncher0EyU unix 3 [ ] STREAM CONNECTED 28499 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 28498 4366/klauncher [kde unix 3 [ ] STREAM CONNECTED 26499 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 26498 11314/klauncher0EyU unix 3 [ ] STREAM CONNECTED 26486 4467/kontact /tmp/ksocket-didier/kontactoijRSa.slave-socket unix 3 [ ] STREAM CONNECTED 26485 11314/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25452 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 25451 11129/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25450 4462/konqueror [kde /tmp/ksocket-didier/konqueror3DG8Oa.slave-socket unix 3 [ ] STREAM CONNECTED 25448 11129/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25432 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 25431 11125/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25429 4462/konqueror [kde /tmp/ksocket-didier/konquerorCg3z9b.slave-socket unix 3 [ ] STREAM CONNECTED 25425 11125/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22199 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22198 4801/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22174 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22173 4799/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22156 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22155 4800/klauncher0EyU unix 3 [ ] STREAM CONNECTED 21407 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 21406 10664/kmix [kdeinit unix 3 [ ] STREAM CONNECTED 21405 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 21402 10664/kmix [kdeinit unix 3 [ ] STREAM CONNECTED 21399 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 21398 10664/kmix [kdeinit unix 2 [ ] DGRAM 20736 - unix 3 [ ] STREAM CONNECTED 19277 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 19276 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 19275 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 19272 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 19265 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 19264 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 12984 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 12983 4666/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12761 4467/kontact /tmp/ksocket-didier/kontactsTY3Bb.slave-socket unix 3 [ ] STREAM CONNECTED 12687 4801/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12759 4467/kontact /tmp/ksocket-didier/kontactYyQzta.slave-socket unix 3 [ ] STREAM CONNECTED 12681 4800/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12764 4467/kontact /tmp/ksocket-didier/kontactUfNfjb.slave-socket unix 3 [ ] STREAM CONNECTED 12678 4799/klauncher0EyU unix 3 [ ] STREAM CONNECTED 11713 4368/kded [kdeinit] /tmp/ksocket-didier/kdedN1sj7b.slave-socket unix 3 [ ] STREAM CONNECTED 11712 4666/klauncher0EyU unix 3 [ ] STREAM CONNECTED 11480 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 11479 4626/kttsd unix 3 [ ] STREAM CONNECTED 11476 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 11475 4626/kttsd unix 3 [ ] STREAM CONNECTED 11472 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 11471 4626/kttsd unix 3 [ ] STREAM CONNECTED 11448 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 11447 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11440 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 11439 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11436 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 11435 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11399 4612/ispell unix 3 [ ] STREAM CONNECTED 11398 4467/kontact unix 3 [ ] STREAM CONNECTED 11397 4612/ispell unix 3 [ ] STREAM CONNECTED 11396 4467/kontact unix 3 [ ] STREAM CONNECTED 11395 4467/kontact unix 3 [ ] STREAM CONNECTED 11394 4612/ispell unix 3 [ ] STREAM CONNECTED 11392 4370/gam_server @/tmp/fam-didier- unix 3 [ ] STREAM CONNECTED 11391 4467/kontact unix 3 [ ] STREAM CONNECTED 10985 4427/artsd /tmp/ksocket-didier/Tamino-114b-48551204 unix 3 [ ] STREAM CONNECTED 10984 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10899 - /var/run/sdp unix 3 [ ] STREAM CONNECTED 10898 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10890 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10889 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10888 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10887 4467/kontact unix 3 [ ] STREAM CONNECTED 10884 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10883 4462/konqueror [kde unix 3 [ ] STREAM CONNECTED 10882 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10881 4467/kontact unix 3 [ ] STREAM CONNECTED 10878 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10877 4467/kontact unix 3 [ ] STREAM CONNECTED 10872 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10871 4467/kontact unix 3 [ ] STREAM CONNECTED 10859 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10858 4467/kontact unix 3 [ ] STREAM CONNECTED 10840 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10839 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10838 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10837 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10834 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10833 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10809 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10808 4475/python unix 3 [ ] STREAM CONNECTED 10805 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10804 4475/python unix 3 [ ] STREAM CONNECTED 10768 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10767 4475/python unix 3 [ ] STREAM CONNECTED 10741 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10740 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10723 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10722 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10718 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10717 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10656 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10655 4467/kontact unix 3 [ ] STREAM CONNECTED 10652 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10651 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10646 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10645 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10642 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10641 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10640 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10639 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10628 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10627 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10624 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10623 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10622 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10621 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10612 4370/gam_server @/tmp/fam-didier- unix 3 [ ] STREAM CONNECTED 10611 4482/korgac unix 3 [ ] STREAM CONNECTED 10608 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10607 4368/kded [kdeinit] unix 3 [ ] STREAM CONNECTED 10603 - 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* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 2008-06-15 13:37 ` Didier Raboud @ 2008-06-16 13:21 ` Ilpo Järvinen [not found] ` <200806172359.33768.didier@raboud.com> 0 siblings, 1 reply; 15+ messages in thread From: Ilpo Järvinen @ 2008-06-16 13:21 UTC (permalink / raw) To: Didier Raboud; +Cc: Andrew Morton, Netdev, bugme-daemon [-- Attachment #1: Type: TEXT/PLAIN, Size: 6081 bytes --] On Sun, 15 Jun 2008, Didier Raboud wrote: > Le samedi 14 juin 2008 22:45:41 Ilpo Järvinen, vous avez écrit : > > On Fri, 13 Jun 2008, Andrew Morton wrote: > > > (switched to email. Please respond via emailed reply-to-all, not via the > > > bugzilla web interface). > > OK. > > > > On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) bugme-daemon@bugzilla.kernel.org > wrote: > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > > > Product: Networking > > > > Version: 2.5 > > > > KernelVersion: 2.6.26-rc5 > > > > Platform: All > > > > OS/Version: Linux > > > > Tree: Mainline > > > > Status: NEW > > > > Severity: normal > > > > Priority: P1 > > > > Component: Other > > > > AssignedTo: acme@ghostprotocols.net > > > > ReportedBy: didier@raboud.com > > > > > > > > > > > > Latest working kernel version: 2.6.25-2 > > > > Earliest failing kernel version: 2.6.26-rc5 > > > > Distribution: Debian (Lenny + Sid) > > > > Hardware Environment: amd64 (Dell Latitude D630) > > > > Software Environment: KDE > > > > Problem Description: > > > > > > > > With kernel version 2.6.26-rc5, the ssh connections to remote servers > > > > randomly > > > > hang (no error message). No amelioration despite the activation of > > > > "ServerAliveInterval" on both sides. > > > > Thanks for reporting. Could you please clarify couple of things: > > Hi. > > I will try to, with my time and knowledge. > > > Does this only happen with a particular server/servers? > > I have only tried with two of my home servers. One runs 2.6.22-4-686 and the > other 2.6.18-6-vserver-686. > > > Any middleboxes in between (NAT, firewall, etc.)? > > There is a ADSL router which "provides" internet to the servers by NAT. > I have tried from "inside" the house (so in the same subnet) and from > outside: it hangs in both cases. ...Ok. Those have some timeouts for idle sessions, so if one has active or keepalived sessions that shouldn't be a problem. > The common point is my use of "iwl3945" : I have always tried the ssh > connections through WiFi. > > > Do all ssh connections hang simultaneously? > > Well... It is hard to say. As far as I have seen, no. When I get one hang, I > can successfully connect to the same server. It's quite likely that the hangs are independent, but it was worth of confirming still. > > How long have you waited until concluding that TCP is "hung"? > > Well. The "ServerAliveInterval" option of openssh now leads to "Received > disconnect from $IP: 2: Timeout, your session not responding." after the > hang. So the openssh server notices that my session is not responding and so > cuts the connection. > > > Is TSO enabled (ethtool -k)? Have you tried without it? > > Doesn't seem: > > ---- > # ethtool -k wlan0 > Offload parameters for wlan0: > Cannot get device rx csum settings: Operation not supported > Cannot get device tx csum settings: Operation not supported > Cannot get device scatter-gather settings: Operation not supported > Cannot get device tcp segmentation offload settings: Operation not supported > Cannot get device udp large send offload settings: Operation not supported > Cannot get device generic segmentation offload settings: Operation not > supported > no offload info available > ---- > > > It wouldn't hurt to include info about eth hw too (e.g., lspci), though > > it might turn unneeded at some point of time but it might save an email > > round-trip. > > lspci attached. ...Thanks for all the details. I especially appreciated the kernel versions of the servers since TCP has two end hosts (and I forgot to ask)... :-) > > TCP can appear to hang due to vast number of reasons. Only recent changes > > that are suspectable is the DEFERRED_ACCEPT thing which is already > > reverted in the very latest Linus' tree (even -rc6 is too old for that) > > and few FRTO fixes (you can exclude FRTO by turning > > /proc/sys/net/ipv4/tcp_frto sysctl to 0 but it seems quite unlikely to > > change anything); your problem might well come from something else and TCP > > hang is just a symptom of other problem downstream. > > I can't understand everything, but what I can say is that with the exact > same software, I get no hangs with 2.6.25-2 but I get some with > 2.6.26-rc5. Yes, I understand that... I was just trying to bring up above what has changed between those kernels :-). ...Quite few TCP related changes actually (there were also some TSO related changes but they're not significant in your case). > > So please gather this information (at least for the relevant connections): > > > > $ netstat -pn > > $ cat /proc/net/tcp > > Attached. I probably wasn't specific enough. ...I meant that you would get this once one of the ssh sessions gets stuck (do it right after you notice that the session is stuck, that should get the info before the connection is cut down). This info should be collected from both ends (on client and server). > > ...Also a tcpdump might be handy (though I don't know yet). > > Well. It seems that there is another bug here: everytime I tried a Ah, lets try to figure that one out as well... > # tcpdump -w /tmp/tcpdump.wlan0 -i wlan0 > > I got a CPU lockup (or similar, can't know exactly, but keyboard blocked and > nothing doable). You probably run it under X, no? Please switch beforehand to some other vt (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and running that command there and see if you get some output into screen there. If you see something (e.g., a sudden OOPS message or some other warning printed) when it locks up, the easiest things is to take a shot with a digicam (or write it down somewhere else) and send that shot (or those details) to us please. ...Once you have a tcpdump, I can probably figure at least something out (though it might still just point to the right direction rather than exposing the actual cause). -- i. ^ permalink raw reply [flat|nested] 15+ messages in thread
[parent not found: <200806172359.33768.didier@raboud.com>]
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 [not found] ` <200806172359.33768.didier@raboud.com> @ 2008-06-17 23:04 ` Ilpo Järvinen 2008-06-18 7:24 ` Johannes Berg 0 siblings, 1 reply; 15+ messages in thread From: Ilpo Järvinen @ 2008-06-17 23:04 UTC (permalink / raw) To: Didier Raboud; +Cc: Andrew Morton, Netdev, bugme-daemon, linux-wireless [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #1: Type: TEXT/PLAIN; charset=utf-8, Size: 3090 bytes --] On Tue, 17 Jun 2008, Didier Raboud wrote: > Le lundi 16 juin 2008 15:21:25 Ilpo Järvinen, vous avez écrit : > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > > > > > Product: Networking > > > > > > Version: 2.5 > > > > > > KernelVersion: 2.6.26-rc5 > > > > > > Platform: All > > > > > > OS/Version: Linux > > > > > > Tree: Mainline > > > > > > Status: NEW > > > > > > Severity: normal > > > > > > Priority: P1 > > > > > > Component: Other > > > > > > AssignedTo: acme@ghostprotocols.net > > > > > > ReportedBy: didier@raboud.com > > > > > > > > > > > > > > > > > > Latest working kernel version: 2.6.25-2 > > > > > > Earliest failing kernel version: 2.6.26-rc5 > > > > > > Distribution: Debian (Lenny + Sid) > > > > > > Hardware Environment: amd64 (Dell Latitude D630) > > > > > > Software Environment: KDE > > > > > > Problem Description: > > > > > > > > > > > > With kernel version 2.6.26-rc5, the ssh connections to remote > > > > > > servers randomly > > > > > > hang (no error message). No amelioration despite the activation of > > > > > > "ServerAliveInterval" on both sides. > > > > (...) > > > > > > The common point is my use of "iwl3945" : I have always tried the ssh > > > connections through WiFi. > > > > > > > So please gather this information (at least for the relevant > > > > connections): > > > > > > > > $ netstat -pn > > > > $ cat /proc/net/tcp > > I used a script which logged both every 15 seconds on both sides (in "screen" > on server side). I then triggered a hang with several "seq 1 100" in the ssh > session. The logs are in the attached debug_ssh_hang.tar.gz . The hang > appeared between 234327 and 234342 on the client side (so somewhere between > 234324, 234339 and 234354 on the server side). > > I hope it'll help. Thanks, a quick look didn't indicate anything similar to one other report from Håkon... I'd probably need a tcpdump. > > You probably run it under X, no? Please switch beforehand to some other vt > > (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and > > running that command there and see if you get some output into screen > > there. If you see something (e.g., a sudden OOPS message or some other > > warning printed) when it locks up, the easiest things is to take a shot > > with a digicam (or write it down somewhere else) and send that shot (or > > those details) to us please. > > I tried the following in vt1 (under the new 2.6.26-rc6 with kdm stopped): > > # tcpdump -i wlan0 -w /tmp/tcpdump.wlan0 > > and I got the attached "soft lockup". Thanks, I guess the folks at linux-wireless can continue in resolving this one with you (I'm out of time anyway now). > > ...Once you have a tcpdump, I can probably figure at least something out > > (though it might still just point to the right direction rather than > > exposing the actual cause). > > I can't get one... :) ...Ok. -- i. ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 7:24 ` Johannes Berg 0 siblings, 0 replies; 15+ messages in thread From: Johannes Berg @ 2008-06-18 7:24 UTC (permalink / raw) To: Ilpo Järvinen Cc: Didier Raboud, Andrew Morton, Netdev, bugme-daemon, linux-wireless, David S. Miller [-- Attachment #1: Type: text/plain, Size: 1182 bytes --] > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 Andrew Prince reported a similar problem and said he bisected it to davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use skb_header_cloned() on TX path.") which made no sense to me so I marked the report as 'to investigate when I have more time'. > > > You probably run it under X, no? Please switch beforehand to some other vt > > > (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and > > > running that command there and see if you get some output into screen > > > there. If you see something (e.g., a sudden OOPS message or some other > > > warning printed) when it locks up, the easiest things is to take a shot > > > with a digicam (or write it down somewhere else) and send that shot (or > > > those details) to us please. > > > > I tried the following in vt1 (under the new 2.6.26-rc6 with kdm stopped): > > > > # tcpdump -i wlan0 -w /tmp/tcpdump.wlan0 > > > > and I got the attached "soft lockup". Attached where? I can't find it in the bug either. johannes [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 7:24 ` Johannes Berg 0 siblings, 0 replies; 15+ messages in thread From: Johannes Berg @ 2008-06-18 7:24 UTC (permalink / raw) To: Ilpo Järvinen Cc: Didier Raboud, Andrew Morton, Netdev, bugme-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r, linux-wireless-u79uwXL29TY76Z2rM5mHXA, David S. Miller [-- Attachment #1: Type: text/plain, Size: 1182 bytes --] > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 Andrew Prince reported a similar problem and said he bisected it to davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use skb_header_cloned() on TX path.") which made no sense to me so I marked the report as 'to investigate when I have more time'. > > > You probably run it under X, no? Please switch beforehand to some other vt > > > (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and > > > running that command there and see if you get some output into screen > > > there. If you see something (e.g., a sudden OOPS message or some other > > > warning printed) when it locks up, the easiest things is to take a shot > > > with a digicam (or write it down somewhere else) and send that shot (or > > > those details) to us please. > > > > I tried the following in vt1 (under the new 2.6.26-rc6 with kdm stopped): > > > > # tcpdump -i wlan0 -w /tmp/tcpdump.wlan0 > > > > and I got the attached "soft lockup". Attached where? I can't find it in the bug either. johannes [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 2008-06-18 7:24 ` Johannes Berg @ 2008-06-18 8:05 ` David Miller -1 siblings, 0 replies; 15+ messages in thread From: David Miller @ 2008-06-18 8:05 UTC (permalink / raw) To: johannes Cc: ilpo.jarvinen, didier, akpm, netdev, bugme-daemon, linux-wireless RnJvbTogSm9oYW5uZXMgQmVyZyA8am9oYW5uZXNAc2lwc29sdXRpb25zLm5ldD4NCkRhdGU6IFdl ZCwgMTggSnVuIDIwMDggMDk6MjQ6NDcgKzAyMDANCg0KPiANCj4gPiA+ID4gPiA+ID4gPiBodHRw Oi8vYnVnemlsbGEua2VybmVsLm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTA5MDMNCj4gPiA+ID4gPiA+ ID4gPg0KPiA+ID4gPiA+ID4gPiA+ICAgICAgICAgICAgU3VtbWFyeTogc3NoIGNvbm5lY3Rpb25z IGhhbmcgd2l0aCAyLjYuMjYtcmM1DQo+IA0KPiBBbmRyZXcgUHJpbmNlIHJlcG9ydGVkIGEgc2lt aWxhciBwcm9ibGVtIGFuZCBzYWlkIGhlIGJpc2VjdGVkIGl0ICB0bw0KPiBkYXZlbSdzIO+7vzYw ODk2MWE1ZWNhOGQzYzZiZDA3MTcyZmViYzI3YjU1NTk0MDhjNWQgKCJtYWM4MDIxMTogVXNlDQo+ IHNrYl9oZWFkZXJfY2xvbmVkKCkgb24gVFggcGF0aC4iKSB3aGljaCBtYWRlIG5vIHNlbnNlIHRv IG1lIHNvIEkgbWFya2VkDQo+IHRoZSByZXBvcnQgYXMgJ3RvIGludmVzdGlnYXRlIHdoZW4gSSBo YXZlIG1vcmUgdGltZScuDQoNClRoYXQncyB1c2VmdWwgaW5mb3JtYXRpb24uICBUaGUga2VybmVs IGJ1Z3ppbGxhIGVudHJ5IGlzIGZvcg0KdGhlIGl3bDM5NDUgZHJpdmVyLCBzbyB0aGF0IG1hdGNo ZXMgdXAgYWNjdXJhdGVseSB3aXRoIHRoaXMNCnRvby4NCg0KSWYgd2UgY2FuJ3QgZmlndXJlIG91 dCB3aGF0J3MgZ29pbmcgb24gaGVyZSBzb29uIChsaWtlLCBpbiBsZXNzIHRoYW4gYQ0KZGF5KSB3 ZSBzaG91bGQgcmV2ZXJ0IHRoYXQgY2hhbmdlc2V0Lg0KDQpBY3R1YWxseSwgSSB0aGluayBJIHNl ZSBob3cgdGhlIGNoYW5nZXNldCBtaWdodCBiZSB3cm9uZy4gIEkgdGhpbmsNCnRoZSBlbmNyeXB0 aW9uIGxheWVyIG9mIG1hYzgwMjExIGFzc3VtZXMgaXQgY2FuIHdyaXRlIG92ZXIgdGhlDQpkYXRh IGFyZWEgb2YgdGhlIFNLQiBpdCdzIHdvcmtpbmcgb24sIG5vdCBqdXN0IHRoZSBoZWFkZXJzLg0K DQpPbmNlIHRoaXMgaGFwcGVucywgYW55IHJldHJhbnNtaXRzIGRvbmUgYnkgU0tCIHdpbGwgZmFp bCBiZWNhdXNlIHRoZQ0KbWFzdGVyIHBhY2tldCBkYXRhIG9uIFRDUCdzIHJldHJhbnNtaXQgcXVl dWUgaXMgbm93IHRoaXMgZW5jcnlwdGVkDQpnYXJiYWdlLg0K ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 8:05 ` David Miller 0 siblings, 0 replies; 15+ messages in thread From: David Miller @ 2008-06-18 8:05 UTC (permalink / raw) To: johannes Cc: ilpo.jarvinen, didier, akpm, netdev, bugme-daemon, linux-wireless From: Johannes Berg <johannes@sipsolutions.net> Date: Wed, 18 Jun 2008 09:24:47 +0200 > > > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > Andrew Prince reported a similar problem and said he bisected it to > davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use > skb_header_cloned() on TX path.") which made no sense to me so I marked > the report as 'to investigate when I have more time'. That's useful information. The kernel bugzilla entry is for the iwl3945 driver, so that matches up accurately with this too. If we can't figure out what's going on here soon (like, in less than a day) we should revert that changeset. Actually, I think I see how the changeset might be wrong. I think the encryption layer of mac80211 assumes it can write over the data area of the SKB it's working on, not just the headers. Once this happens, any retransmits done by SKB will fail because the master packet data on TCP's retransmit queue is now this encrypted garbage. ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 8:26 ` David Miller 0 siblings, 0 replies; 15+ messages in thread From: David Miller @ 2008-06-18 8:26 UTC (permalink / raw) To: johannes Cc: ilpo.jarvinen, didier, akpm, netdev, bugme-daemon, linux-wireless From: David Miller <davem@davemloft.net> Date: Wed, 18 Jun 2008 01:05:28 -0700 (PDT) > If we can't figure out what's going on here soon (like, in less than a > day) we should revert that changeset. > > Actually, I think I see how the changeset might be wrong. I think > the encryption layer of mac80211 assumes it can write over the > data area of the SKB it's working on, not just the headers. > > Once this happens, any retransmits done by SKB will fail because the > master packet data on TCP's retransmit queue is now this encrypted > garbage. After some discussion about this with Johannes on IRC, we are absolutely convinced this is exactly the problem. I intend to send the following revert to Linus tonight so we can close this: -------------------- Revert "mac80211: Use skb_header_cloned() on TX path." This reverts commit 608961a5eca8d3c6bd07172febc27b5559408c5d. The problem is that the mac80211 stack not only needs to be able to muck with the link-level headers, it also might need to mangle all of the packet data if doing sw wireless encryption. This fixes kernel bugzilla #10903. Thanks to Didier Raboud (for the bugzilla report), Andrew Prince (for bisecting), Johannes Berg (for bringing this bisection analysis to my attention), and Ilpo (for trying to analyze this purely from the TCP side). In 2.6.27 we can take another stab at this, by using something like skb_cow_data() when the TX path of mac80211 ends up with a non-NULL tx->key. The ESP protocol code in the IPSEC stack can be used as a model for implementation. Signed-off-by: David S. Miller <davem@davemloft.net> --- net/mac80211/tx.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 1d7dd54..28d8bd5 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1562,13 +1562,13 @@ int ieee80211_subif_start_xmit(struct sk_buff *skb, * be cloned. This could happen, e.g., with Linux bridge code passing * us broadcast frames. */ - if (head_need > 0 || skb_header_cloned(skb)) { + if (head_need > 0 || skb_cloned(skb)) { #if 0 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " "of headroom\n", dev->name, head_need); #endif - if (skb_header_cloned(skb)) + if (skb_cloned(skb)) I802_DEBUG_INC(local->tx_expand_skb_head_cloned); else I802_DEBUG_INC(local->tx_expand_skb_head); -- 1.5.5.1.308.g1fbb5 ^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 8:26 ` David Miller 0 siblings, 0 replies; 15+ messages in thread From: David Miller @ 2008-06-18 8:26 UTC (permalink / raw) To: johannes-cdvu00un1VgdHxzADdlk8Q Cc: ilpo.jarvinen-pxSi+dnQzZMxHbG02/KK1g, didier-efQUOpnRmEvQT0dZR+AlfA, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b, netdev-u79uwXL29TY76Z2rM5mHXA, bugme-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r, linux-wireless-u79uwXL29TY76Z2rM5mHXA From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org> Date: Wed, 18 Jun 2008 01:05:28 -0700 (PDT) > If we can't figure out what's going on here soon (like, in less than a > day) we should revert that changeset. > > Actually, I think I see how the changeset might be wrong. I think > the encryption layer of mac80211 assumes it can write over the > data area of the SKB it's working on, not just the headers. > > Once this happens, any retransmits done by SKB will fail because the > master packet data on TCP's retransmit queue is now this encrypted > garbage. After some discussion about this with Johannes on IRC, we are absolutely convinced this is exactly the problem. I intend to send the following revert to Linus tonight so we can close this: -------------------- Revert "mac80211: Use skb_header_cloned() on TX path." This reverts commit 608961a5eca8d3c6bd07172febc27b5559408c5d. The problem is that the mac80211 stack not only needs to be able to muck with the link-level headers, it also might need to mangle all of the packet data if doing sw wireless encryption. This fixes kernel bugzilla #10903. Thanks to Didier Raboud (for the bugzilla report), Andrew Prince (for bisecting), Johannes Berg (for bringing this bisection analysis to my attention), and Ilpo (for trying to analyze this purely from the TCP side). In 2.6.27 we can take another stab at this, by using something like skb_cow_data() when the TX path of mac80211 ends up with a non-NULL tx->key. The ESP protocol code in the IPSEC stack can be used as a model for implementation. Signed-off-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org> --- net/mac80211/tx.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 1d7dd54..28d8bd5 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1562,13 +1562,13 @@ int ieee80211_subif_start_xmit(struct sk_buff *skb, * be cloned. This could happen, e.g., with Linux bridge code passing * us broadcast frames. */ - if (head_need > 0 || skb_header_cloned(skb)) { + if (head_need > 0 || skb_cloned(skb)) { #if 0 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " "of headroom\n", dev->name, head_need); #endif - if (skb_header_cloned(skb)) + if (skb_cloned(skb)) I802_DEBUG_INC(local->tx_expand_skb_head_cloned); else I802_DEBUG_INC(local->tx_expand_skb_head); -- 1.5.5.1.308.g1fbb5 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 11:34 ` Didier Raboud 0 siblings, 0 replies; 15+ messages in thread From: Didier Raboud @ 2008-06-18 11:34 UTC (permalink / raw) To: Johannes Berg Cc: Ilpo Järvinen, Andrew Morton, Netdev, bugme-daemon, linux-wireless, David S. Miller [-- Attachment #1: Type: text/plain, Size: 964 bytes --] Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez écrit : > > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > Andrew Prince reported a similar problem and said he bisected it to > davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use > skb_header_cloned() on TX path.") which made no sense to me so I marked > the report as 'to investigate when I have more time'. > > > > and I got the attached "soft lockup". > > Attached where? I can't find it in the bug either. > > johannes Hi, for unknown reasons, my mail doesn't appear in the mailing list archives and the big attachment has visibly been stripped. You'll find the "soft lockup" there: http://raboud.homelinux.org/~didier/kernel/tcpdump_oops.jpg Regards, Didier -- Didier Raboud, proud Debian user. CH-1802 Corseaux didier@raboud.com [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 197 bytes --] ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 11:34 ` Didier Raboud 0 siblings, 0 replies; 15+ messages in thread From: Didier Raboud @ 2008-06-18 11:34 UTC (permalink / raw) To: Johannes Berg Cc: Ilpo Järvinen, Andrew Morton, Netdev, bugme-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r, linux-wireless-u79uwXL29TY76Z2rM5mHXA, David S. Miller [-- Attachment #1: Type: text/plain, Size: 993 bytes --] Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez écrit : > > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > Andrew Prince reported a similar problem and said he bisected it to > davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use > skb_header_cloned() on TX path.") which made no sense to me so I marked > the report as 'to investigate when I have more time'. > > > > and I got the attached "soft lockup". > > Attached where? I can't find it in the bug either. > > johannes Hi, for unknown reasons, my mail doesn't appear in the mailing list archives and the big attachment has visibly been stripped. You'll find the "soft lockup" there: http://raboud.homelinux.org/~didier/kernel/tcpdump_oops.jpg Regards, Didier -- Didier Raboud, proud Debian user. CH-1802 Corseaux didier-efQUOpnRmEvQT0dZR+AlfA@public.gmane.org [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 197 bytes --] ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 11:39 ` Michael Buesch 0 siblings, 0 replies; 15+ messages in thread From: Michael Buesch @ 2008-06-18 11:39 UTC (permalink / raw) To: Didier Raboud Cc: Johannes Berg, Ilpo Järvinen, Andrew Morton, Netdev, bugme-daemon, linux-wireless, David S. Miller On Wednesday 18 June 2008 13:34:06 Didier Raboud wrote: > Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez =C3=A9crit= =C2=A0: > > > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=3D10903 > > > > > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-= rc5 > > > > Andrew Prince reported a similar problem and said he bisected it t= o > > davem's =EF=BB=BF608961a5eca8d3c6bd07172febc27b5559408c5d ("mac8021= 1: Use > > skb_header_cloned() on TX path.") which made no sense to me so I ma= rked > > the report as 'to investigate when I have more time'. > > > > > > and I got the attached "soft lockup". > > > > Attached where? I can't find it in the bug either. > > > > johannes >=20 > Hi,=20 >=20 > for unknown reasons, my mail doesn't appear in the mailing list archi= ves and=20 > the big attachment has visibly been stripped. >=20 > You'll find the "soft lockup" there: >=20 > http://raboud.homelinux.org/~didier/kernel/tcpdump_oops.jpg The soft lockup most likely is a followup-oops to a previous one that locked up the machine. Can you try to reproduce and capture the screen before waiting 61 secon= ds for the watchdog to trigger. There should be another oops before that (= you see the last two lines of it on this picture) --=20 Greetings Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-wireles= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 @ 2008-06-18 11:39 ` Michael Buesch 0 siblings, 0 replies; 15+ messages in thread From: Michael Buesch @ 2008-06-18 11:39 UTC (permalink / raw) To: Didier Raboud Cc: Johannes Berg, Ilpo Järvinen, Andrew Morton, Netdev, bugme-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r, linux-wireless-u79uwXL29TY76Z2rM5mHXA, David S. Miller On Wednesday 18 June 2008 13:34:06 Didier Raboud wrote: > Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez écrit : > > > > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=10903 > > > > > > > > > > > > > > > > > > Summary: ssh connections hang with 2.6.26-rc5 > > > > Andrew Prince reported a similar problem and said he bisected it to > > davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use > > skb_header_cloned() on TX path.") which made no sense to me so I marked > > the report as 'to investigate when I have more time'. > > > > > > and I got the attached "soft lockup". > > > > Attached where? I can't find it in the bug either. > > > > johannes > > Hi, > > for unknown reasons, my mail doesn't appear in the mailing list archives and > the big attachment has visibly been stripped. > > You'll find the "soft lockup" there: > > http://raboud.homelinux.org/~didier/kernel/tcpdump_oops.jpg The soft lockup most likely is a followup-oops to a previous one that locked up the machine. Can you try to reproduce and capture the screen before waiting 61 seconds for the watchdog to trigger. There should be another oops before that (you see the last two lines of it on this picture) -- Greetings Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 15+ messages in thread
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[not found] <bug-10903-10286@http.bugzilla.kernel.org/>
2008-06-13 9:58 ` [Bugme-new] [Bug 10903] New: ssh connections hang with 2.6.26-rc5 Andrew Morton
2008-06-14 20:45 ` Ilpo Järvinen
2008-06-15 13:37 ` Didier Raboud
2008-06-16 13:21 ` Ilpo Järvinen
[not found] ` <200806172359.33768.didier@raboud.com>
2008-06-17 23:04 ` Ilpo Järvinen
2008-06-18 7:24 ` Johannes Berg
2008-06-18 7:24 ` Johannes Berg
2008-06-18 8:05 ` David Miller
2008-06-18 8:05 ` David Miller
2008-06-18 8:26 ` David Miller
2008-06-18 8:26 ` David Miller
2008-06-18 11:34 ` Didier Raboud
2008-06-18 11:34 ` Didier Raboud
2008-06-18 11:39 ` Michael Buesch
2008-06-18 11:39 ` Michael Buesch
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