Messages in this thread | | | Date | Sat, 16 Sep 2006 14:45:00 +0200 | From | Tilman Schmidt <> | Subject | [2.6.18-rc7] printk output delay in syslog wrt dmesg still unfixed |
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The following problem, which I reported for kernel 2.6.18-rc1 on my development machine Dell OptiPlex GX110 uname -a = Linux gx110 2.6.18-rc7-noinitrd #1 PREEMPT Thu Sep 14 15:13:38 CEST 2006 i686 i686 i386 GNU/Linux 933 MHz Pentium III processor, i810 chipset, 512 MB RAM distribution SuSE 10.0, syslog-ng 1.6.8, klogd 1.4.1, Xorg X11 6.8.2 still exists with 2.6.18-rc7:
While X is running, output from printk() appears in syslog (eg. /var/log/messages) only after a key is pressed on the system keyboard, even though it is visible with dmesg immediately.
Additional observations: - The problem is *not* present with 2.6.17.* or earlier kernels. - The problem *is* present with 2.6.18-rc*-mm* kernels. - The problem disappears if the X server is terminated (telinit 3) and reappears if the X server is started again (telinit 5). - Syslog messages from userspace programs are not affected by the delay. - No messages are lost, all appear eventually, though possibly hours or days later, depending on how long nobody touches the keyboard. - It doesn't matter which key is pressed; even pressing a shift key all by its own is sufficient to make the missing messages appear. - I couldn't find any other action that would release the messages; neither mouse movements or clicks, nor waiting up to 24 hours, not even logging in via ssh from another machine and compiling a Linux kernel. ;-) - The effect can be clearly observed by the difference between the kernel's own timestamps and those by syslogd; an extreme example:
Sep 16 14:11:16 gx110 kernel: [18729.057746] gigaset: unblocking all channels Sep 16 14:11:16 gx110 kernel: [18729.057765] gigaset: searching scheduled commands Sep 16 14:11:16 gx110 kernel: [86033.298803] gigaset: received response (8 bytes): ^M^JZLOG^M^J Sep 16 14:11:16 gx110 kernel: [86033.298898] bas_gigaset: cmd_loop: End of Command (0 Bytes)
Please let me know if I can help in any way with locating the cause of this annoying phenomenon.
Thanks Tilman
-- Tilman Schmidt E-Mail: tilman@imap.cc Bonn, Germany Diese Nachricht besteht zu 100% aus wiederverwerteten Bits. Ungeoeffnet mindestens haltbar bis: (siehe Rueckseite)
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