Bug 504798
| Summary: | stty/termios lockup (by race?) due to TCSADRAIN | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jan Kratochvil <jan.kratochvil> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | 12 | CC: | itamar, kernel-maint, ovasik, redhat-bugzilla |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2010-12-05 06:52:20 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
To the coreutils maintainer: As the workaround looks mostly harmless to me Fedora may possibly workaround it (stty.c TCSADRAIN->TCSANOW) before the kernel bug gets fixed. Sounds reasonably and harmless in rawhide - built with TCSANOW in stty as coreutils-7.4-2.fc12 until fixed in kernel. This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle. Changing version to '12'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping This message is a reminder that Fedora 12 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 12. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '12'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 12's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 12 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed. |
Description of problem: Machine running 4 GDB testsuites in parallel in mock always gets at least one of the testsuites hanging on `stty sane' by `expect' with no apparent reason. stty hangs on: if (tcsetattr (STDIN_FILENO, TCSADRAIN, &mode)) Got it workarounded by TCSANOW but it looks as a kernel wait race to me. Version-Release number of selected component (if applicable): kernel-2.6.30-0.97.rc8.fc12.x86_64 ( + coreutils-7.2-1.fc11.{x86_64.i586} ) How reproducible: Always in about 4 runs. Steps to Reproduce: I do not have a reproducer, it requires some custom testing scripts etc. I can test some kernel patches. Actual results: Hanging on: 27991 /var/lib/mock/fedora-11-i386/root/dev/pts/5 SNs+ 0:00 \_ expect -- /usr/share/dejagnu/runtest.exp --target_board=unix/-m32/-fPIE/-pie 27992 /var/lib/mock/fedora-11-i386/root/dev/pts/5 SN+ 0:00 \_ sh -c /bin/stty sane < /dev/pts/5 28036 /var/lib/mock/fedora-11-i386/root/dev/pts/5 SN+ 0:00 \_ /bin/stty sane Expected results: No hang. Additional info: Replaced TCSADRAIN by TCSANOW in /bin/stty in the mock chroots and the problem is gone. Still I see no reason why TCSADRAIN should hang, no-one is writing into that chrootdir/dev/pts/5. Standard global devpts is mounted in all chrootdirs/dev/pts. hanging `stty sane': #0 0x00007f5117104c78 in tcsetattr () from /lib64/libc.so.6 0x00007f5117104c76 <tcsetattr+150>: syscall if (tcsetattr (STDIN_FILENO, TCSADRAIN, &mode)) #1 0x00000000004031af in main (argc=<value optimized out>, argv=<value optimized out>) at stty.c:1004 # ls -l /proc/*/fd/*|grep pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/27991/fd/0 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/27991/fd/1 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:35 /proc/27991/fd/2 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/27992/fd/0 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/27992/fd/1 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:35 /proc/27992/fd/2 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lr-x------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/28036/fd/0 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:43 /proc/28036/fd/1 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 lrwx------ 1 jkratoch jkratoch 64 2009-06-09 12:35 /proc/28036/fd/2 -> /var/lib/mock/fedora-11-i386/root/dev/pts/5 $ cat /proc/{27991,27992,28036}/fdinfo/{0,1,2} pos: 0 flags: 02 pos: 0 flags: 02 pos: 0 flags: 02 pos: 0 flags: 02 pos: 0 flags: 02 pos: 0 flags: 02 pos: 0 flags: 0100000 pos: 0 flags: 02 pos: 0 flags: 02 $ $ stty -F /var/lib/mock/fedora-11-i386/root/dev/pts/5 speed 9600 baud; line = 0; intr = <undef>; quit = <undef>; erase = <undef>; kill = <undef>; eof = <undef>; start = <undef>; stop = <undef>; susp = <undef>; rprnt = <undef>; werase = <undef>; lnext = <undef>; flush = <undef>; min = 1; time = 0; -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok noflsh -echoctl -echoke $ stty -F /var/lib/mock/fedora-11-i386/root/dev/pts/5 -a speed 9600 baud; rows 0; columns 0; line = 0; intr = <undef>; quit = <undef>; erase = <undef>; kill = <undef>; eof = <undef>; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = <undef>; stop = <undef>; susp = <undef>; rprnt = <undef>; werase = <undef>; lnext = <undef>; flush = <undef>; min = 1; time = 0; -parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts -ignbrk -brkint ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff -iuclc -ixany -imaxbel -iutf8 -opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 -isig -icanon -iexten -echo -echoe -echok -echonl noflsh -xcase -tostop -echoprt -echoctl -echoke stty S ffff880032955440 5504 28036 27992 ffff88019c9999f8 0000000000000082 0000000000000000 0000000000000000 0000000000000000 000000000d402ead ffff88019c999968 ffffffff8101a805 ffff8800965127c8 000000000000e440 ffff8800965127c8 00000000001d33c0 Call Trace: [<ffffffff8101a805>] ? native_sched_clock+0x2d/0x54 [<ffffffff810888cb>] ? trace_hardirqs_on_caller+0x139/0x173 [<ffffffff814b6fe3>] schedule+0x21/0x49 [<ffffffff814b74a9>] schedule_timeout+0x36/0xf6 [<ffffffff812dd24c>] ? n_tty_chars_in_buffer+0x8c/0xae [<ffffffff812e2abe>] ? pty_chars_in_buffer+0x3b/0x6d [<ffffffff812dfdb1>] tty_wait_until_sent+0xc8/0x11c [<ffffffff81075843>] ? autoremove_wake_function+0x0/0x5f [<ffffffff812dff4e>] set_termios+0x149/0x3c0 [<ffffffff812e0426>] tty_mode_ioctl+0x15e/0x436 [<ffffffff810888cb>] ? trace_hardirqs_on_caller+0x139/0x173 [<ffffffff81088925>] ? trace_hardirqs_on+0x20/0x36 [<ffffffff812e088a>] n_tty_ioctl_helper+0x18c/0x1ae [<ffffffff812e09eb>] ? tty_ldisc_try+0x4f/0x6d [<ffffffff812dd802>] n_tty_ioctl+0xda/0xf5 [<ffffffff812db987>] tty_ioctl+0x823/0x86e [<ffffffff8101a805>] ? native_sched_clock+0x2d/0x54 [<ffffffff811347b7>] vfs_ioctl+0x31/0xaa [<ffffffff81134cad>] do_vfs_ioctl+0x47d/0x4d4 [<ffffffff81088925>] ? trace_hardirqs_on+0x20/0x36 [<ffffffff81134d69>] sys_ioctl+0x65/0x9c [<ffffffff811652b3>] do_ioctl32_pointer+0x23/0x39 [<ffffffff81167d7d>] compat_sys_ioctl+0x324/0x38b [<ffffffff810b4c07>] ? audit_syscall_entry+0x12d/0x16d [<ffffffff814b94a3>] ? trace_hardirqs_off_thunk+0x3a/0x3c [<ffffffff81042c7f>] sysenter_dispatch+0x7/0x33 [<ffffffff814b9464>] ? trace_hardirqs_on_thunk+0x3a/0x3f Name: stty State: S (sleeping) Tgid: 28036 Pid: 28036 PPid: 27992 TracerPid: 0 Uid: 502 502 502 502 Gid: 502 502 502 502 Utrace: 0 FDSize: 64 Groups: 502 VmPeak: 1900 kB VmSize: 1900 kB VmLck: 0 kB VmHWM: 412 kB VmRSS: 412 kB VmData: 156 kB VmStk: 84 kB VmExe: 52 kB VmLib: 1592 kB VmPTE: 20 kB Threads: 1 SigQ: 14/53248 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000001000 SigCgt: 0000000000000000 CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: ffffffffffffffff Cpus_allowed: ff Cpus_allowed_list: 0-7 Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001 Mems_allowed_list: 0 voluntary_ctxt_switches: 1 nonvoluntary_ctxt_switches: 3 sh S ffff88003277a440 5456 27992 27991 ffff88013319fd28 0000000000000082 0000000000000000 00000000ba37fac7 ffff88013319fc88 ffffffff8101a805 ffff88013319fc98 00000000ba37fac7 ffff8800da1f03e8 000000000000e440 ffff8800da1f03e8 00000000001d33c0 Call Trace: [<ffffffff8101a805>] ? native_sched_clock+0x2d/0x54 [<ffffffff814b6fe3>] schedule+0x21/0x49 [<ffffffff8105ee09>] do_wait+0x2a2/0x3e6 [<ffffffff81051e7b>] ? default_wake_function+0x0/0x3b [<ffffffff814b9acf>] ? _spin_unlock_irqrestore+0x5a/0x7f [<ffffffff8105efe3>] sys_wait4+0x96/0xc7 [<ffffffff8109fd0c>] compat_sys_wait4+0x3a/0xe8 [<ffffffff8107a127>] ? up_read+0x3a/0x55 [<ffffffff81013b35>] ? retint_swapgs+0x13/0x1b [<ffffffff810b4c07>] ? audit_syscall_entry+0x12d/0x16d [<ffffffff8104416c>] sys32_waitpid+0x23/0x39 [<ffffffff81042c7f>] sysenter_dispatch+0x7/0x33 expect S ffff880032955440 5984 27991 31547 ffff88010a52fd28 0000000000000082 0000000000000000 00000000daac65fa ffff88010a52fc88 ffffffff8101a805 ffff88010a52fc98 00000000daac65fa ffff8800965103e8 000000000000e440 ffff8800965103e8 00000000001d33c0 Call Trace: [<ffffffff8101a805>] ? native_sched_clock+0x2d/0x54 [<ffffffff814b6fe3>] schedule+0x21/0x49 [<ffffffff8105ee09>] do_wait+0x2a2/0x3e6 [<ffffffff81051e7b>] ? default_wake_function+0x0/0x3b [<ffffffff81071cf2>] ? find_get_pid+0x70/0x8f [<ffffffff8105efe3>] sys_wait4+0x96/0xc7 [<ffffffff8109fd0c>] compat_sys_wait4+0x3a/0xe8 [<ffffffff8107a127>] ? up_read+0x3a/0x55 [<ffffffff81013b35>] ? retint_swapgs+0x13/0x1b [<ffffffff810b4c07>] ? audit_syscall_entry+0x12d/0x16d [<ffffffff8104416c>] sys32_waitpid+0x23/0x39 [<ffffffff81042c7f>] sysenter_dispatch+0x7/0x33 [<ffffffff814b9464>] ? trace_hardirqs_on_thunk+0x3a/0x3f