Instability issue with FC5 on dual-core system.

[Hans Kristian Rosbach]

On Thu, 2006-06-29 at 18:39 +0200, Hans Kristian Rosbach wrote:
> System runs latest FC5 x86-64 kernel (2.6.17-1.2139_FC5)
> System might suddenly hang hard or reboot.

Now on 2.6.17-1.2145_FC5 still shows problems, this time it
complains about page_mapcount beeing -1.
And after that there is a Kernel BUG message curiously mentioning
/block/hdd/removable aswell. But this time it seems it's mysqld
that crashed?

I'm confused as to what is causing this since memtest86+ does not
find anything wrong. There are also no new bioses available.

-HK


Losing some ticks... checking if CPU frequency changed.
Eeek! page_mapcount(page) went negative! (-1)
  page->flags = 100000000000060
  page->count = 1
  page->mapping = ffff81006ebca741
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at mm/rmap.c:560
invalid opcode: 0000 [1] SMP
last sysfs file: /block/hdd/removable
CPU 1
Modules linked in: ipv6 autofs4 dm_mirror dm_mod video button battery
acpi_memho tplug ac lp parport_pc parport sg i2c_nforce2 i2c_core floppy
forcedeth raid1 ex t3 jbd sata_nv libata sd_mod scsi_mod
Pid: 20302, comm: mysqld Not tainted 2.6.17-1.2145_FC5 #1
RIP: 0010:[<ffffffff8020a721>] <ffffffff8020a721>{page_remove_rmap+115}
RSP: 0018:ffff81005c08fdd8  EFLAGS: 00010286
RAX: 00000000ffffffff RBX: ffff81007f474c40 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffffffff80548ad0
RBP: ffff81007992a400 R08: 00000000000000a0 R09: ffff81005c08fb28
R10: 0000000000000010 R11: 0000000000000000 R12: 00002aaad440d000
R13: ffff81005642b068 R14: 00002aaad4600000 R15: ffff810001020480
FS:  000000004514c940(0063) GS:ffff81007debd740(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002aaad4865000 CR3: 000000007688f000 CR4: 00000000000006e0
Process mysqld (pid: 20302, threadinfo ffff81005c08e000, task
ffff810066db8040)
Stack: ffff81007f474c40 ffffffff80207b10 0000000000000000
ffff81005c08fec0
       00002aaad4866000 00002aaad3e01000 ffff81005e2ff928
ffff81005c08fec8
       00000000001f3000 0000000000000000
Call Trace: <ffffffff80207b10>{unmap_vmas+1063}
<ffffffff802122ea>{unmap_region+ 185}
       <ffffffff802114bd>{do_munmap+528} <ffffffff802169ae>{sys_munmap
+86}
       <ffffffff80262d8e>{system_call+126}

Code: 0f 0b 68 ca d0 47 80 c2 30 02 5b 48 83 ce ff bf 20 00 00 00
RIP <ffffffff8020a721>{page_remove_rmap+115} RSP <ffff81005c08fdd8>