Description of problem: Our x86 test systems no longer boot with kernel-2.6.9-86.EL. They did boot with kernel-2.6.9-85.EL. The serial console output looks like: Welcome to Red Hat Enterprise Linux AS Press 'I' to enter interactive startup. Setting clock (utc): Thu Apr 9 13:23:23 CDT 2009 [ OK ] Starting udev: [ OK ] *HANG* Next expected output: Initializing hardware... storage network audio done[ OK ] I tried to collect SysRq-T output and reset the system with SysRq-B, but it did not work. I was able to see "SysRq : Show State" but nothing after that. SysRq-B prints "SysRq: Resetting" but the system does not reboot. Version-Release number of selected component (if applicable): kernel-2.6.9-86.EL How reproducible: every time on my hardware Steps to Reproduce: 1. Install RHEL4-U8-re20090401.0 on an i386 system with a serial console? 2. 3. Actual results: Expected results: Additional info:
I added some tracing to rc.sysinit and then start_udev and finally straced udevsettle to find this: nanosleep({0, 500000000}, NULL) = 0 access("/dev/.udevsettle", F_OK) = 0 nanosleep({0, 500000000}, NULL) = 0 access("/dev/.udevsettle", F_OK) = 0 nanosleep({0, 500000000}, NULL) = 0 access("/dev/.udevsettle", F_OK) = 0 nanosleep({0, 500000000}, The check for .udevsettle repeated 23 times, then the nanosleep hung. I was able to get backtraces this time, but showPc output is more interesting SysRq : Show Regs Pid: 2982, comm: udev EIP: 0060:[<022d457a>] CPU: 0 EIP is at _spin_lock_irqsave+0x38/0x45 EFLAGS: 00000286 Not tainted (2.6.9-86.ELhugemem) EAX: c1f7c2d8 EBX: 00000246 ECX: 00000015 EDX: 00000001 ESI: c1f7c2d8 EDI: c1f7c258 EBP: c1f7c0f8 DS: 007b ES: 007b CR0: 8005003b CR2: 08549054 CR3: 003ce000 CR4: 000006f0 [<c2894450>] qla2x00_sysfs_read_nvram+0x4a/0x7a [qla2xxx] [<0219275a>] fill_read+0x1e/0x22 [<021927f8>] read+0x9a/0xd6 [<0215c7f1>] vfs_read+0xb6/0xe2 [<0215ca06>] sys_read+0x3c/0x62 This system does have a QLogic HBA.
I tried kernel-2.6.9-87.EL and that boots on my systems. Perhaps this was fixed by 476704.
Marking this a dup of 476704 since kernel-2.6.9-87.EL boots where kernel-2.6.9-86.EL would not and 476704 is the only qla2xxx related fix in -87. *** This bug has been marked as a duplicate of bug 476704 ***