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Description of problem: GRE over IPv4 tunneling driver Slab corruption (Not tainted): size-128 start=ffff88001b2dde88, len=128 Redzone: 0x9f911029d74e35b/0x9f911029d74e35b. Last user: [<ffffffff8145a35a>](rx_queue_release+0x6a/0x80) 010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Prev obj: start=ffff88001b2dddf0, len=128 Redzone: 0xd84156c5635688c0/0xd84156c5635688c0. Last user: [<ffffffff810bcd0e>](load_module+0x1aee/0x1dd0) 000: b8 65 36 1d 00 88 ff ff 01 00 00 00 00 00 00 00 010: 80 6f 66 1a 00 88 ff ff 00 00 00 00 00 00 00 00 Next obj: start=ffff88001b2ddf20, len=128 Redzone: 0xd84156c5635688c0/0xd84156c5635688c0. Last user: [<ffffffff8115a8cb>](alloc_vmap_area+0x5b/0x390) 000: 00 00 3c a0 ff ff ff ff 00 50 3c a0 ff ff ff ff 010: 04 00 00 00 00 00 00 00 79 35 cc 19 00 88 ff ff Version-Release number of selected component (if applicable): 2.6.32-115.el6.x86_64.debug How reproducible: always Steps to Reproduce: 1.boot kernel-debug 2.modprobe ip_gre 3.rmmod ip_gre Actual results: slab corruption warnings. The can also appear spordically when other modules are loaded or unloaded. Expected results: module loads and unloads with no warnings or errors. Additional info:
Just in case it makes any difference, I reproduced this on an x86_64 kvm guest running on an x86_64 RHEL 6.0 host. The host has: [mpg@dhcp231-174 x86_64]$ rpm -qa | grep kvm qemu-kvm-tools-0.12.1.2-2.113.el6.x86_64 qemu-kvm-0.12.1.2-2.113.el6.x86_64 [mpg@dhcp231-174 x86_64]$ uname -r 2.6.32-71.6.1.el6.x86_64
Created attachment 478326 [details] net: Do not zero object we just freed Does this patch help?
2.6.32-115.el6.bz676099 seems to help. I tried both the x86_64 and x86_64.debug kernel on my test VM and was not able to reproduce the problem.
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
Patch(es) available on kernel-2.6.32-118.el6
Reproduced in 2.6.32-115.el6.x86_64.debug and 2.6.32-117.el6.x86_64.debug. Verified in 2.6.32-118.el6.x86_64.debug.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0542.html