Recently my landlord installed a new breaker box, and in the process cut off power to one of my machines, an iMac DV/400 running Debian.
The power was off for a few hours while he worked and when the machine booted up it kernel paniced. After a reboot everything was fine, and the machine stayed up for a couple weeks. Today my landlord needed to do some more work, so the power was shut off again. A second time, the machine kernel paniced on the first boot, and remained stable after a reboot. I was curious about this and decided to unplug the machine. Any time the machine was left without power for say, 10-20 minutes, a cold boot would produce a kernel panic. However, one could do a soft reboot as many times as he/she pleased, with no problems, or shut it down for 5 minutes or so with no problems. Any time the machine remained without power for an extended period of time, the following cold boot would result in random segmentation faults and eventually a kernel panic. I booted OS X on this machine from my iBook's hard drive to check the SMART status of the hard drive, and also run memtestosx. Nothing awkward showed up, and OS X was solid. This machine has a PRAM battery that is on the verge of dying: could that have anything to do with this? Could have something in the open firmware gotten corrupted in that first outage? This is really irritating me, even though the system is stable after one reboot . . . The segmentation faults always occur early on in the startup sequence, but also have slightly different errors (sometimes a usb hotplug is to blame; sometimes its a page file, etc). One reboot later though -- everything is fine again. Dec 14 17:29:36 xxxxx kernel: Oops: Exception in kernel mode, sig: 5 [#1] Dec 14 17:29:36 xxxxx kernel: NIP: C00536AC LR: C004A5D4 SP: CF6F9C40 REGS: cf6f9b90 TRAP: 0700 Not tainted Dec 14 17:29:36 xxxxx kernel: MSR: 00029032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 Dec 14 17:29:36 xxxxx kernel: TASK = cf96c670[777] 'default.hotplug' THREAD: cf6f8000 Dec 14 17:29:36 xxxxx kernel: Last syscall: 2 Dec 14 17:29:36 xxxxx kernel: GPR00: C0411C28 CF6F9C40 CF96C670 C0411C20 10057000 0E94C15C 00000001 40000000 Dec 14 17:29:36 xxxxx kernel: GPR08: 003ACD80 00000001 00000000 FFFFFFFF 003ACD80 100C1E94 CF6F9D9C 00000000 Dec 14 17:29:36 xxxxx kernel: GPR16: CF6D4520 00000001 C0300000 00000001 C0300000 10000000 008E1305 C0302FE0 Dec 14 17:29:36 xxxxx kernel: GPR24: 10063000 00000000 000A6000 C0411C20 00000000 CE94C18C FFFFFFFD 00063000 Dec 14 17:29:36 xxxxx kernel: NIP [c00536ac] page_remove_rmap+0x54/0x68 Dec 14 17:29:36 xxxxx kernel: LR [c004a5d4] zap_pte_range+0x23c/0x40c Dec 14 17:29:36 xxxxx kernel: Call trace: Dec 14 17:29:36 xxxxx kernel: [c004a5d4] zap_pte_range+0x23c/0x40c Dec 14 17:29:36 xxxxx kernel: [c004a7ec] zap_pmd_range+0x48/0x84 Dec 14 17:29:36 xxxxx kernel: [c004a868] zap_pud_range+0x40/0x78 Dec 14 17:29:36 xxxxx kernel: [c004a948] unmap_page_range+0xa8/0xc8 Dec 14 17:29:36 xxxxx kernel: [c004aab8] unmap_vmas+0x150/0x210 Dec 14 17:29:36 xxxxx kernel: [c0051094] exit_mmap+0x64/0x13c Dec 14 17:29:36 xxxxx kernel: [c00177b4] mmput+0x50/0xd4 Dec 14 17:29:36 xxxxx kernel: [c001bbf4] exit_mm+0x148/0x1a8 Dec 14 17:29:36 xxxxx kernel: [c001c538] do_exit+0xcc/0x33c Dec 14 17:29:36 xxxxx kernel: [c001c828] do_group_exit+0x38/0x90 Dec 14 17:29:36 xxxxx kernel: [c0026ef0] get_signal_to_deliver+0x15c/0x2a8 Dec 14 17:29:36 xxxxx kernel: [c000847c] do_signal+0x3c/0x22c Dec 14 17:29:36 xxxxx kernel: [c0004af4] do_user_signal+0x7c/0xcc Dec 14 17:29:36 xxxxx kernel: note: default.hotplug[777] exited with preempt_count 1 Any help would be appreciated! __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
