[Xen-devel] Tracebacks from dom0 pvops changeset 2342

[M A Young <m.a.young@xxxxxxxxxxxx>]

I have managed to get a dom0 kernel based on pvops changeset 2342 and a 
Fedora kernel package to boot from a USB linux image, and it 
finishes eventually, but there are several bug tracebacks on the way. The 
full dmesg output (gzipped) is attached, but samples are below. Are these 
useful, and would further information help?
        Michael Young

------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2185 trace_hardirqs_on_caller+0xd1/0x151() 
(Not tainted)
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.29-0.41.rc2.pvops2342.fc10.x86_64 #1
Call Trace:
 [<ffffffff81049b95>] warn_slowpath+0xb9/0xf5
 [<ffffffff8100db95>] ? __raw_callee_save_xen_save_fl+0x11/0x1e
 [<ffffffff8106be45>] ? trace_hardirqs_off+0xd/0xf
 [<ffffffff8100b6ce>] ? xen_mc_flush+0x1ab/0x205
 [<ffffffff8106bdd7>] ? trace_hardirqs_off_caller+0x49/0xaa
 [<ffffffff8100c5e1>] ? xen_mc_issue+0x3c/0x50
 [<ffffffff8106cdb7>] trace_hardirqs_on_caller+0xd1/0x151
 [<ffffffff8106ce44>] trace_hardirqs_on+0xd/0xf
 [<ffffffff8100c5e1>] xen_mc_issue+0x3c/0x50
 [<ffffffff816019ab>] xen_setup_kernel_pagetable+0x402/0x455
 [<ffffffff81600ba7>] xen_start_kernel+0x34e/0x4a9

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<(null)>] (null)
PGD 0
Oops: 0010 [#1] SMP DEBUG_PAGEALLOC
last sysfs file: /sys/devices/LNXSYSTM:00/modalias
CPU 0
Modules linked in: intelfb(+) i2c_algo_bit i2c_core wmi video output 
squashfs vf
at fat usb_storage sdhci_pci sdhci mmc_core firewire_ohci firewire_core 
crc_itu_
t ata_generic pata_acpi
Pid: 12, comm: work_on_cpu/0 Tainted: G        W 
2.6.29-0.41.rc2.pvops2342.fc10
.x86_64 #1
RIP: e030:[<0000000000000000>]  [<(null)>] (null)
RSP: e02b:ffff8800de219c68  EFLAGS: 00010282
RAX: ffffffff815382e0 RBX: 00000000fffffffa RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000010000 RDI: 00000000000e0000
RBP: ffff8800de219cd0 R08: 0000000000000002 R09: ffff8800dbc6c368
R10: ffff8800de210200 R11: ffff8800dc84ab28 R12: 00000000000e0000
R13: ffff8800dc470201 R14: 0000000000000001 R15: 00000000000e0000
FS:  00007fc7af5fe790(0000) GS:ffff8800090c3000(0000) 
knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000001001000 CR4: 0000000000002620
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process work_on_cpu/0 (pid: 12, threadinfo ffff8800de218000, task 
ffff8800de2100
00)
Stack:
 ffffffff8101f381 ffff8800de219c90 01ffffff8100ebd6 0000000000010000
 ffff8800dbc6c350 ffff8800de219cb0 ffffffff8119666d 0000000000003001
 0000000000010000 00000000000e0000 ffff8800dc470201 0000000000000001
Call Trace:
 [<ffffffff8101f381>] ? mtrr_add_page+0x3a/0x34f
 [<ffffffff8119666d>] ? _raw_spin_unlock+0x8e/0x93
 [<ffffffff8101f6d5>] mtrr_add+0x3f/0x4e
 [<ffffffffa008b862>] intelfb_pci_register+0x6d0/0xde9 [intelfb]
 [<ffffffff8106cd05>] ? trace_hardirqs_on_caller+0x1f/0x151
 [<ffffffff8100dc09>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff8100e2f2>] ? check_events+0x12/0x20
 [<ffffffff811a03f3>] local_pci_probe+0x12/0x16
 [<ffffffff8105a61f>] do_work_for_cpu+0x13/0x1b
 [<ffffffff8105a815>] run_workqueue+0x13a/0x242
 [<ffffffff8105a7c1>] ? run_workqueue+0xe6/0x242
 [<ffffffff8105a60c>] ? do_work_for_cpu+0x0/0x1b
 [<ffffffff8100e2df>] ? xen_restore_fl_direct_end+0x0/0x1
 [<ffffffff8138113b>] ? __mutex_unlock_slowpath+0x128/0x133
 [<ffffffff8105a9fd>] worker_thread+0xe0/0xf1
 [<ffffffff8105e6c4>] ? autoremove_wake_function+0x0/0x38
 [<ffffffff8105a91d>] ? worker_thread+0x0/0xf1
 [<ffffffff8105e34c>] kthread+0x49/0x76
 [<ffffffff8101322a>] child_rip+0xa/0x20
 [<ffffffff81044800>] ? finish_task_switch+0x49/0x115
 [<ffffffff8106ce44>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff81012c10>] ? restore_args+0x0/0x30
 [<ffffffff81013220>] ? child_rip+0x0/0x20
Code:  Bad RIP value.
RIP  [<(null)>] (null)
 RSP <ffff8800de219c68>
CR2: 0000000000000000

swap_dup: Bad swap file entry 80000000006ba970
swap_free: Bad swap file entry 80000000006aeee0
BUG: Bad page map in process lvm  pte:d5ddc020 pmd:dccbc067
addr:00000000006b3000 vm_flags:08000070 anon_vma:(null) 
mapping:ffff8800d49abeb0
 index:16
vma->vm_ops->fault: filemap_fault+0x0/0x331
vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x55
Pid: 2693, comm: lvm Tainted: G      D W 
2.6.29-0.41.rc2.pvops2342.fc10.x86_64
#1
Call Trace:
 [<ffffffff810b6d9f>] print_bad_pte+0x22f/0x248
 [<ffffffff810c4ed4>] ? swap_info_get+0xa6/0xad
 [<ffffffff810b7e14>] unmap_vmas+0x668/0x88b
 [<ffffffff8100dc09>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff8100e2f2>] ? check_events+0x12/0x20
 [<ffffffff8100cfd0>] ? xen_exit_mmap+0x10f/0x13f
 [<ffffffff810abf55>] ? ____pagevec_lru_add+0x99/0x191
 [<ffffffff810bc50c>] exit_mmap+0xc5/0x13c
 [<ffffffff810475e4>] mmput+0x45/0xa4
 [<ffffffff8104b56a>] exit_mm+0x113/0x11f
 [<ffffffff8104d1f0>] do_exit+0x1da/0x8a4
 [<ffffffff810dacbe>] ? __fput+0x18a/0x197
 [<ffffffff8104d939>] do_group_exit+0x7f/0xaf
 [<ffffffff8104d97b>] sys_exit_group+0x12/0x16
 [<ffffffff810120b2>] system_call_fastpath+0x16/0x1b

Attachment: xen.dmesg.gz
Description: gzipped dmesg output

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