Bug 648378

Summary: Kernel panic on reading from /proc/bus/pci/XX/YY while hot-removing the device.
Product: Red Hat Enterprise Linux 5 Reporter: Wade Mealing <wmealing>
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED DUPLICATE QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 5.7CC: eteo
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-02 04:56:40 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
My most recent attempt none

Description Wade Mealing 2010-11-01 06:54:28 UTC 
Description of problem:

When reading the /proc/bus/pci/XX/YY file while hot-removing the device that
relates to this file, kernel panics with the following call trace. 

ID: 14583 TASK: ffff81046be23860 CPU: 15 COMMAND: "appname"
#0 [ffff81046fe2bbe0] crash_kexec at ffffffff800aeb6b
#1 [ffff81046fe2bc68] pci_user_read_config_dword at ffffffff80056e0e
#2 [ffff81046fe2bce0] do_page_fault at ffffffff80067dd7
#3 [ffff81046fe2bdd0] error_exit at ffffffff8005ede9
[exception RIP: pci_user_read_config_dword+83]
RIP: ffffffff80056e0e RSP: ffff81046fe2be88 RFLAGS: 00010046
RAX: 0000000000000246 RBX: ffff81044f095000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R8: ffff81046fe2be94 R9: ffff81047e45eac0
R10: ffff81046fe2a000 R11: 0000000000000000 R12: 0000000000000087
R13: 0000000000000246 R14: ffff81046fe2bedc R15: ffff81046fe2bf50
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#4 [ffff81046fe2be80] pci_user_read_config_dword at ffffffff80056def
#5 [ffff81046fe2bec0] proc_bus_pci_read at ffffffff80160b60
#6 [ffff81046fe2bf10] vfs_read at ffffffff8000b6b0
#7 [ffff81046fe2bf40] sys_read at ffffffff80011c01
#8 [ffff81046fe2bf80] sysenter_do_call at ffffffff8006249d
RIP: 00000000ffffe410 RSP: 00000000ef29c130 RFLAGS: 00000296
RAX: 0000000000000003 RBX: ffffffff8006249d RCX: 00000000f2e3b000
RDX: 0000000000001000 RSI: 00000000f264bff8 RDI: 00000000f264bff8
RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000
R10: 00000000ffffe410 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000ef29c158 R14: 0000000000000030 R15: 0000000100000000
ORIG_RAX: 0000000000000003 CS: 0023 SS: 002b 


Version-Release number of selected component (if applicable):

2.6.18-194.el5 

How reproducible:

Every time

Steps to Reproduce:


Step to Reproduce:
1) Open a /proc/bus/pci/XX/YY file.
2) Hot-remove the related device.
# echo 0 > /sys/bus/pci/slots/ZZ/power
3) Read the /proc/bus/pci/XX/YY file.   

Actual results:

Panic

Expected results:

No panic.

Additional info:
Comment 3 Wade Mealing 2010-11-02 04:56:40 UTC 
Going to continue working this in the original bug.

*** This bug has been marked as a duplicate of bug 618114 ***