Messages in this thread | | | Date | Fri, 18 Sep 2009 14:32:55 +0900 | From | Jin Dongming <> | Subject | [BUG? -next] login prompt of tty2~6 displayed slowly |
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Hi, all
I have a trouble on tty of -next. After the system booted and login prompt of tty1 was displayed, I tried to change tty1 to tty2 or other console with Ctrl+Alt+FN(N:2~6). The changed screen was black and there was not login prompt. After a few(2~3) minutes the prompt was displayed. I checked the message of klog and there were some errors of tty listed as following:
Sep 15 10:02:44 iridium /sbin/mingetty[3062]: tty2: cannot open tty: Input/output error Sep 15 10:02:44 iridium /sbin/mingetty[3063]: tty3: cannot open tty: Input/output error Sep 15 10:02:44 iridium /sbin/mingetty[3060]: tty4: cannot open tty: Input/output error Sep 15 10:02:44 iridium /sbin/mingetty[3061]: tty5: cannot open tty: Input/output error Sep 15 10:02:44 iridium /sbin/mingetty[3066]: tty6: cannot open tty: Input/output error Sep 15 10:02:49 iridium init: tty2 main process (3062) terminated with status 1 Sep 15 10:02:49 iridium init: tty2 main process ended, respawning Sep 15 10:02:49 iridium init: tty3 main process (3063) terminated with status 1 Sep 15 10:02:49 iridium init: tty3 main process ended, respawning Sep 15 10:02:49 iridium /sbin/mingetty[3107]: tty3: cannot open tty: Input/output error Sep 15 10:02:49 iridium init: tty4 main process (3060) terminated with status 1 Sep 15 10:02:49 iridium init: tty4 main process ended, respawning Sep 15 10:02:49 iridium /sbin/mingetty[3106]: tty2: cannot open tty: Input/output error Sep 15 10:02:49 iridium /sbin/mingetty[3108]: tty4: cannot open tty: Input/output error Sep 15 10:02:49 iridium init: tty5 main process (3061) terminated with status 1 Sep 15 10:02:49 iridium init: tty5 main process ended, respawning Sep 15 10:02:49 iridium /sbin/mingetty[3109]: tty5: cannot open tty: Input/output error Sep 15 10:02:49 iridium init: tty6 main process (3066) terminated with status 1 Sep 15 10:02:49 iridium init: tty6 main process ended, respawning Sep 15 10:02:49 iridium /sbin/mingetty[3110]: tty6: cannot open tty: Input/output error
And I find out that the root cause of this problem is the following patch: commit 236cce0066f9c6a4856bc0404e541d3db3b0255e Titled "tty: make the kref destructor occur asynchronously"
When the tty is closed, the content of tty is not released immediately. And the flag of tty is set with TTY_CLOSING. So when the tty is reopened, the tty may not be released yet. Because the TTY_CLOSING in flag of tty is still valid. The kernel returns "-EIO" error. And the message "/sbin/mingetty[3062]: tty2: cannot open tty: Input/output error" is displayed at the user land.
Best Regards Jin Dongming
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