This bug was fixed in the package linux - 4.18.0-20.21
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linux (4.18.0-20.21) cosmic; urgency=medium
* CVE-2018-12126 // CVE-2018-12127 // CVE-2018-12130
- Documentation/l1tf: Fix small spelling typo
- x86/cpu: Sanitize FAM6_ATOM naming
- kvm: x86: Report STIBP on GET_
** Attachment added: "kprobe-test.c"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5259304/+files/kprobe-test.c
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Verification successful on Cosmic.
Updated the test-case kernel part (attached), and repeated it 20+ times,
without any process hanging.
In all cases, the new function call into write_cache_pages() is observed
in thread 0, between page index 2 and page index 1.
[ 150.914872] mod_init():161 :: h
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
cosmic' to 'verification-done-cosmic'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1824827
Title:
tasks doing write()/fsync() hit deadlock in
The change introduced by the patch is evident in the kernel message log for
Thread 0:
between page indexes 2 and 1 there's now another function call to
write_cache_pages()
instead of just another iteration of the for-loop inside one call.
Original kernel:
[ 695.276320] Thread 0 running, TID = 3
Patch posted for SRU:
[C][PATCH 0/1] Fix write()/fsync() deadlock in write_cache_pages()
https://lists.ubuntu.com/archives/kernel-team/2019-April/100084.html
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testcase
test kernel :: latest cosmic version + patch:
$ uname -rv
4.18.0-18-generic #19+test20190415b1 SMP Mon Apr 15 15:43:20 UTC 2019
[ 169.145212] kprobe_test: loading out-of-tree module taints kernel.
[ 169.149144] kprobe_test: module
testcase, userspace part.
** Attachment added: "test.c"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5255995/+files/test.c
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testcase
original kernel :: latest cosmic version:
$ uname -rv
4.18.0-18-generic #19-Ubuntu SMP Tue Apr 2 18:13:16 UTC 2019
[ 654.491029] kprobe_test: loading out-of-tree module taints kernel.
[ 654.493322] kprobe_test: module verification fail
testcase, kernel part.
** Attachment added: "kprobe-test.c"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5255994/+files/kprobe-test.c
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