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Description of problem: After installing RHEL6.0-20100512.0-Server on 4 test systems, their consoles no longer work properly.
Created attachment 416217 [details] sosreport from affected system I'm able to read from ttyS0 if I cat it and type on the serial console, kernel debug output makes it to the serial console, but agetty seems stuck in an ioctl. Other test systems work fine. [root@taft-01 ~]# strace -p `pidof agetty` Process 2237 attached - interrupt to quit fstat(3, {st_mode=S_IFREG|0644, st_size=80, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f87b5a34000 read(3, "Red Hat Enterprise Linux Server "..., 4096) = 80 fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(4, 64), ...}) = 0 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f87b5a33000 write(1, "Red Hat Enterprise Linux Server "..., 60) = 60 write(1, "Kernel 2.6.32-25.el6.x86_64 on a"..., 41) = 41 write(1, "\n", 1) = 1 read(3, "", 4096) = 0 ioctl(0, SNDCTL_TMR_STOP or TCSETSW sysrq agetty S ffff88021fc24500 0 2354 1 0x00000080 ffff8802134dfb18 0000000000000082 ffff8802134dfae0 ffff8802134dfadc ffff8802134dfaa8 ffff88021fc24500 ffff880028256180 000000010067355c ffff880214922638 ffff8802134dffd8 000000000000fd38 ffff880214922638 Call Trace: [<ffffffff814c9235>] schedule_timeout+0x225/0x2f0 [<ffffffff811f8121>] ? avc_has_perm+0x71/0x90 [<ffffffff812f1d40>] tty_wait_until_sent+0xb0/0x100 [<ffffffff8108cbb0>] ? autoremove_wake_function+0x0/0x40 [<ffffffff812f2292>] set_termios+0x502/0x530 [<ffffffff811f7eeb>] ? avc_has_perm_noaudit+0x2cb/0x490 [<ffffffff812f270a>] tty_mode_ioctl+0x34a/0x480 [<ffffffff814c987e>] ? mutex_lock+0x1e/0x50 [<ffffffff8131aefa>] ? uart_ioctl+0xea/0x330 [<ffffffff812f2879>] n_tty_ioctl_helper+0x39/0x1c0 [<ffffffff8115f557>] ? nameidata_to_filp+0x57/0x70 [<ffffffff812eee43>] n_tty_ioctl+0x23/0xf0 [<ffffffff812ec41b>] tty_ioctl+0xdb/0x930 [<ffffffff81174772>] vfs_ioctl+0x22/0xa0 [<ffffffff81174914>] do_vfs_ioctl+0x84/0x580 [<ffffffff81174e91>] sys_ioctl+0x81/0xa0 [<ffffffff81013172>] system_call_fastpath+0x16/0x1b
This might be a duplicate of Bug 568418
Though bug 568418 may have been fixed in the kernel you tried. If the hang you see occurs only after you enter a username, then it is likely a duplicate of Bug 590851
Okay RHEL6.0-20100512.0-Server has the 2.6.32-25 kernel which already has the fix for Bug 568418. So this leaves Bug 590851 as the likely culprit. Can you try the test kernel in Brew and see if it fixes your problem? https://brewweb.devel.redhat.com/taskinfo?taskID=2468204
I booted with 2.6.32-28.el6bz590851_v1.x86_64 and I can now use the serial console again.
*** This bug has been marked as a duplicate of bug 590851 ***