This is still not fixed in the latest ubuntu kernel - 4.4.0-38-generic
#57-Ubuntu. Considering the low-impact of the fix is this going to go in
future 4.4 releases?
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Ping on the issue. I now also managed to trigger it while setting a very
simple systemtap probe:
probe kernel.function("generic_fillattr") {
printf("Uid in inode: %u gid: %u\n", $inode->i_uid->val,
$inode->i_gid->val);
}
Running this resulted in:
[854807.910390] invalid opcode: [#1
Original report of the exact same issue:
https://lkml.org/lkml/2016/5/13/327
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https://bugs.launchpad.net/bugs/1605843
Title:
Kernel crashes from time to time when using ftr
I think the fix for this crash is this upstream commit:
8329e818f14926a6040df86b2668568bde342ebf
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Title:
Kernel crashes from time to
Is there a way to obtain a vmlinux image for the upstream kernel as
built by ubuntu (without having to compile locally) so that I can
compare the disassemblies of the ftrace_stub ?
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I tried with the upstream kernel :
nborisov@fisk:~$ uname -a
Linux fisk 4.7.0-040700-generic #201607241632 SMP Sun Jul 24 20:34:30 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
In the meantime I managed to find a sequence which can trigger this 100%
of the time on the ubuntu kernel. The following comm
So here is a disassembly of the ftrace functions:
0x8183026b :mov$0x0,%rcx
0x81830272 : callq 0x81156d80
0x81830277 : mov0x40(%rsp),%r9
0x8183027c :mov0x48(%rsp),%r8
0x81830281 :mov0x70(%rsp),%rdi
0x81
** Attachment added: "version.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705812/+files/version.log
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https://bugs.launchpad.net/bugs/160
** Attachment added: "uname-a.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705813/+files/uname-a.log
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Dmesg as seen from the crash dump image.
** Attachment added: "dmesg.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705811/+files/dmesg.log
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Public bug reported:
While performing some tracing suing ftrace-cmd I came across the
following OOPS:
[ 333.051723] invalid opcode: [#1] SMP
[ 333.051742] Modules linked in: drbg ansi_cprng ctr ccm xt_CHECKSUM
iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4
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