Package: linux-image-2.6.25-2-amd64
Version: 2.6.25-5
Severity: normal


Hi,

Kernel 2.6.25 hangs on a Dell PowerEdge 850. This is the lockup captured
with netconsole:

[ 873.350023] NMI Watchdog detected LOCKUP on CPU 0
[ 873.350023] CPU 0
[ 873.350023] Modules linked in: ac battery ipt_REJECT xt_multiport iptable_nat nf_nat ipt_LOG ipt_recent nf_conntrack_ipv4 xt_state nf_conntrack xt_tcpudp ip6table_filter ip6_tables ipv6 iptable_filter ip_tables x_tables 8021q netconsole configfs ipmi_devintf ipmi_si ipmi_msghandler i2c_i801 i3000_edac rng_core button edac_core evdev i2c_core dcdbas pcspkr iTCO_wdt shpchp pci_hotplug ext3 jbd mbcache dm_mirror dm_snapshot dm_mod raid1 md_mod ide_generic ide_cd_mod cdrom sd_mod piix ide_core ata_piix ata_generic libata scsi_mod dock ehci_hcd tg3 uhci_hcd thermal processor fan
[ 873.350023] Pid: 0, comm: swapper Not tainted 2.6.25-2-amd64 #1
[ 873.350023] RIP: 0010:[] [] hpet_rtc_interrupt+0x116/0x2f7
[ 873.350023] RSP: 0018:ffffffff805c3ed8 EFLAGS: 00000097
[ 873.350023] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
[ 873.350023] RDX: 00000000dba8fa91 RSI: 0000000000000002 RDI: 0000000000000002
[ 873.350023] RBP: 000000010002226c R08: 0000000000000000 R09: ffff8100010070a0
[ 873.350023] R10: ffff81010fab7e20 R11: ffff81010fab5200 R12: 00000000000000a6
[ 873.350023] R13: 0000000000000000 R14: ffffffff805879e0 R15: 0000000000000000
[ 873.350023] FS: 0000000000000000(0000) GS:ffffffff80520000(0000) knlGS:0000000000000000
[ 873.350023] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 873.350023] CR2: 00007fd937409000 CR3: 000000010d5d3000 CR4: 00000000000006e0
[ 873.350023] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 873.350023] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 873.350023] Process swapper (pid: 0, threadinfo ffffffff80558000, task ffffffff804ee4a0)
[ 873.350023] Stack: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 873.350023] ffffffff00000000 ffffffff802495ab ffffffff8021263b ffff81010d48f140
[ 873.350023] 0000000000000000 0000000000000000 0000000000000008 ffffffff8026c077
[ 873.350023] Call Trace:
[ 873.350023] [] ? ktime_get_ts+0x17/0x48
[ 873.350023] [] ? read_tsc+0x5/0x7
[ 873.350023] [] ? handle_IRQ_event+0x2c/0x61
[ 873.350023] [] ? handle_edge_irq+0xe0/0x120
[ 873.350023] [] ? do_IRQ+0x6d/0xd9
[ 873.350023] [] ? ret_from_intr+0x0/0x19
[ 873.350023] [] ? native_safe_halt+0x2/0x3
[ 873.350023] [] ? default_idle+0x3b/0x6e
[ 873.350023] [] ? default_idle+0x0/0x6e
[ 873.350023] [] ? cpu_idle+0x89/0xb3
[ 873.350023]
[ 873.350023]
[ 873.350023] Code: f2 1f 00 bf 0a 00 00 00 48 89 c3 e8 5f 26 ff ff 48 89 de 41 88 c4 48 c7 c7 70 e6 5c 80 e8 bf f2 1f 00 45 84 e4 78 04 eb 12 f3 90 <48> 8b 05 b9 66 33 00 48 29 e8 48 83 f8 04 76 ee 48 c7 c7 70 e6
[ 873.350023] ---[ end trace c6ed53b4da5f3a22 ]---
[ 873.350039] Kernel panic - not syncing: Aiee, killing interrupt handler!

I've had lockups with self-compiled 2.6.25 kernels on other hardware as
well, all related to hpet_rtc_interrupt; see the LKML archive for the
details. This is the first time I've tried a Debian-packaged 2.6.25, and
it also hangs. The workaround recommended on LKML was to disable
CONFIG_HPET_EMULATE_RTC (it cannot be disabled in the menu, you have to
edit the configuration by hand). This workaround seems to work for me:

$ uname -a
Linux boogie 2.6.25 #3 SMP Thu Jun 12 13:32:35 CEST 2008 x86_64 GNU/Linux
$ uptime
15:57:16 up 15 days, 1:43, 13 users, load average: 0.24, 0.57, 0.65

Without the workaround, I never got an uptime more than a couple of
hours. So I suggest applying the workaround to the Debian package as
well.

Gabor

-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (990, 'unstable'), (500, 'testing'), (500, 'stable'), (101, 'experimental')
Architecture: i386 (x86_64)

Kernel: Linux 2.6.25 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash



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