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Unable to handle kernel NULL pointer dereference at null --pagetypeinfo_showfree_print (Doc ID 2557519.1)

Last updated on MAY 21, 2021

Applies to:

Linux OS - Version Oracle Linux 7.5 with Unbreakable Enterprise Kernel [4.1.12] and later
Linux x86-64


A server running  Oracle Linux 7.5 with the UEK 4 experienced a kernel panic, with an RIP pagetypeinfo_showfree_print+115

The following call trace was found:

PID: 90243 TASK: ffff8801eadad400 CPU: 17 COMMAND: "perl"

#0 [ffff897a3d648e08] crash_nmi_callback at ffffffff81054b47

#1 [ffff897a3d648e18] nmi_handle at ffffffff8101c2d6

#2 [ffff897a3d648e88] default_do_nmi at ffffffff8101c91d

#3 [ffff897a3d648eb8] do_nmi at ffffffff8101ca74

#4 [ffff897a3d648ee8] end_repeat_nmi at ffffffff8175c8d1

[exception RIP: pagetypeinfo_showfree_print+115]

RIP: ffffffff811bc073 RSP: ffff88a186fafcb8 RFLAGS: 00000012

RAX: ffffea0269f52c20 RBX: ffff89803ffd5458 RCX: 0000000000000000

RDX: 00000000004b73c1 RSI: ffffffff81a4e54e RDI: 0000000000000000

RBP: ffff88a186fafcf8 R8: 00000000fffffffb R9: 0000000000000000

R10: 0000000000000007 R11: ffffffff811bb21e R12: ffff88b5d9340d80

R13: ffffffff817951f0 R14: ffff89803ffd4f00 R15: ffff89803ffd5118

ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018

--- <NMI exception stack> ---

#5 [ffff88a186fafcb8] pagetypeinfo_showfree_print at ffffffff811bc073

#6 [ffff88a186fafd00] walk_zones_in_node at ffffffff811bc3e2

#7 [ffff88a186fafd50] pagetypeinfo_show at ffffffff811bcc29

#8 [ffff88a186fafd80] seq_read at ffffffff812431d0

#9 [ffff88a186fafe00] proc_reg_read at ffffffff8128d390

#10 [ffff88a186fafe30] __vfs_read at ffffffff8121d39a

#11 [ffff88a186fafec0] vfs_read at ffffffff8121dab6

#12 [ffff88a186faff00] sys_read at ffffffff8121ea35

#13 [ffff88a186faff50] system_call_fastpath at ffffffff8175681e

RIP: 00007f8aebfd1790 RSP: 00007fff3fa02af8 RFLAGS: 00000246

RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8aebfd1790

RDX: 0000000000002000 RSI: 0000000003f2c9d0 RDI: 0000000000000008

RBP: 0000000000002000 R8: 0000000000000000 R9: 0000000000002000

R10: 0000000003f2c9d0 R11: 0000000000000246 R12: 0000000003f2c9d0

R13: 0000000000000008 R14: 000000000104e010 R15: 0000000003f2c7e0

ORIG_RAX: 0000000000000000 CS: 0033 SS: 002b

[974274.017760] BUG: unable to handle kernel NULL pointer dereference at (null)

[974274.026592] IP: [] crash_save_cpu+0x92/0x200


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