While running Oracle database test on x86/6GB RAM machine panics with
following messages.
Hi,
Hmm, seems like something in sys_remap_file_pages might have broken.
It's a bit hard to work out from the backtrace, though.
Is it possible you can strace to find the arguments for the
remap_file_pages that goes wrong?
Ahh, I think it's just underflowing the preempt count somewhere, which
is leading highmem.c:15 to just *think* it is in an interrupt.
But you aren't running a preemptible kernel, which makes it unusual...
it would have to be coming from interrupt code (or just random corruption).
Still, preempt debugging should catch those cases as well.
So, can you disregard my last message, and instead compile a kernel
with CONFIG_PREEMPT and CONFIG_DEBUG_PREEMPT, and see what
messages come up?
With CONFIG_PREEMPT and CONFIG_DEBUG_PREEMPT set I got following
messages on rc9.
BUG: using smp_processor_id() in preemptible [00000001] code: oracle/3631
caller is kunmap_atomic+0xb/0x82
[<c04ec241>] debug_smp_processor_id+0xa1/0xb4
[<c0420dd0>] kunmap_atomic+0xb/0x82
[<c045fae3>] __do_fault+0x55/0x35b
[<c04623e8>] handle_mm_fault+0x4d0/0x909
[<c0460624>] follow_page+0x1d9/0x228
[<c0462a71>] get_user_pages+0x250/0x332
[<c0462bce>] make_pages_present+0x7b/0x90
[<c045f06a>] sys_remap_file_pages+0x2de/0x330
[<c0404f0e>] syscall_call+0x7/0xb
[<c0620000>] ioctl_standard_call+0x209/0x2ce
=======================
WARNING: at kernel/sched.c:3389 sub_preempt_count()
[<c0420e2f>] kunmap_atomic+0x6a/0x82
[<c045fae3>] __do_fault+0x55/0x35b
[<c04623e8>] handle_mm_fault+0x4d0/0x909
[<c0460624>] follow_page+0x1d9/0x228
[<c0462a71>] get_user_pages+0x250/0x332
[<c0462bce>] make_pages_present+0x7b/0x90
[<c045f06a>] sys_remap_file_pages+0x2de/0x330
[<c0404f0e>] syscall_call+0x7/0xb
[<c0620000>] ioctl_standard_call+0x209/0x2ce
=======================
------------[ cut here ]------------
kernel BUG at arch/i386/mm/highmem.c:70!
invalid opcode: 0000 [#1]
PREEMPT SMP
Modules linked in: netconsole autofs4 hidp nfs lockd nfs_acl rfcomm
l2cap bluetooth sunrpc ipv6 dm_mirror dm_mod video output sbs battery ac
parport_pc lp parport scb2_flash mtd chipreg sg floppy i2c_piix4
i2c_core tg3 e1000 button ide_cd serio_raw cdrom aic7xxx
scsi_transport_spi sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
CPU: 1
EIP: 0060:[<c0420e21>] Not tainted VLI
EFLAGS: 00010206 (2.6.23-rc9-debug #2)
EIP is at kunmap_atomic+0x5c/0x82
eax: fff8f000 ebx: 0000000f ecx: 0000002a edx: 00070000
esi: fffaa000 edi: 97322000 ebp: 000490b1 esp: f672ce1c
ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
Process oracle (pid: 3617, ti=f672c000 task=f7587320 task.ti=f672c000)
Stack: 00000003 c341038c c045fae3 c401c080 97322000 f7893b1c f77f85c0
01000000
00000000 c341038c 000013d6 00000000 c3410380 00000040 000490b1
00000003
000490b1 97322000 00000000 f672ce78 fffaa910 c341038c 00000040
000490b1
Call Trace:
[<c045fae3>] __do_fault+0x55/0x35b
[<c04623e8>] handle_mm_fault+0x4d0/0x909
[<c0460624>] follow_page+0x1d9/0x228
[<c0462a71>] get_user_pages+0x250/0x332
[<c0462bce>] make_pages_present+0x7b/0x90
[<c045f06a>] sys_remap_file_pages+0x2de/0x330
[<c0404f0e>] syscall_call+0x7/0xb
[<c0620000>] ioctl_standard_call+0x209/0x2ce
=======================
Code: 00 00 00 29 d0 c7 00 00 00 00 00 c7 40 04 00 00 00 00 0f 01 3e eb
18 81 fe ff ff ff bf 77 04 0f 0b eb fe 3b 35 8c 89 7d c0 72 04 <0f> 0b
eb fe b8 01 00 00 00 e8 4d 51 00 00 89 e0 25 00 f0 ff ff
EIP: [<c0420e21>] kunmap_atomic+0x5c/0x82 SS:ESP 0068:f672ce1c
Thanks,
-Guru
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