How to look at a Bad pagetable panic on a x86_64 system.

Solution Unverified - Updated -

Issue

  • The system displays a message containing “Bad pagetable:”
  • The bad page table panic is caused by a Page Fault Exception when the CPU detects one of the reserve bits set in a page directory.
a.out: Corrupted page table at address 2ab3401d3010
PGD 1102b1067 PUD 10f109067 PMD 10f0fc067 PTE 800040010d2b1067
Bad pagetable: 000f [1] SMP 

. . .

Modules linked in: crash autofs4 hidp rfcomm l2cap bluetooth lockd sunrpc be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i libcxgbi cxgb3 8021q libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec dell_wmi wmi button battery asus_acpi acpi_memhotplug ac parport_pc lp parport floppy virtio_balloon snd_hda_intel snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device virtio_net snd_pcm_oss snd_mixer_oss snd_pcm i2c_piix4 snd_timer snd_page_alloc tpm_tis snd_hwdep i2c_core snd tpm serio_raw pcspkr tpm_bios soundcore dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata sd_mod scsi_mod virtio_blk virtio_pci virtio_ring virtio ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 3801, comm: a.out Tainted: G     --------------------    2.6.18-371.6.1.el5 #1
RIP: 0033:[<0000000000400624>]  [<0000000000400624>]
RSP: 002b:00007ffffcfbb380  EFLAGS: 00010206
RAX: 00002ab3401d3010 RBX: 0000003973a1cbc0 RCX: 0000000000600b25
RDX: 0000003973f54970 RSI: 0000000000600b26 RDI: 0000003973f536a0
RBP: 00007ffffcfbb390 R08: 000000000000000a R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffffcfbb470 R14: 0000000000000000 R15: 0000000000000000
FS:  00002ab3401d26e0(0000) GS:ffffffff80436000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00002ab3401d3010 CR3: 000000011ced3000 CR4: 00000000000006e0
Process a.out (pid: 3801, threadinfo ffff810104330000, task ffff81011fa827b0)

RIP  [<0000000000400624>]
 RSP <00007ffffcfbb380>
crash> 

Environment

  • Architecture x86_64
  • Red Hat Enterprise Linux 5 - 7

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