** Changed in: linux (Ubuntu)
Assignee: Guilherme G. Piccoli (gpiccoli) => Alex (alex139)
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https://bugs.launchpad.net/bugs/1839849
Title:
ext4 oops when running xfstests on cifs - kernel 5.0.0-x (Disco) only
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Disco:
Confirmed
Bug description:
I've found an issue with kernel 5.0.0-24 while trying to verify
LP#1824981 in a qemu guest - xfstests running on CIFS triggers a crash
in ext4 with the following signature:
BUG: unable to handle kernel NULL pointer dereference at 000000000000012c
#PF error: [normal kernel read fault]
Oops: 0000 [#1] SMP PTI
CPU: 3 PID: 24980 Comm: 223 Not tainted 5.0.0-24-generic #25-Ubuntu
RIP: 0010:call_filldir+0xa2/0x140
[...]
Call Trace:
ext4_readdir+0x869/0xa80
iterate_dir+0x9a/0x1b0
__x64_sys_getdents+0xa6/0x140
? __x64_sys_getdents+0x140/0x140
do_syscall_64+0x5a/0x110
The full oops is attached below.
I've tested on the following kernels, always in the Disco guest:
*Reproduced -> 5.0.0-7 (built that one), 5.0.0-13, 5.0.0-21, 5.0.0-23,
5.0.0-24 (proposed)
*No Issue -> 4.18.0-25 (from Cosmic), 5.2.0-10 (from Eoan), and 5.0, 5.1 and
5.2 from mainline builds (https://kernel.ubuntu.com/~kernel-ppa/mainline/)
To trigger that I've ran the xfstests on a cifs mount point according
to the instructions in https://wiki.samba.org/index.php/Xfstesting-
cifs . The issue shows around test generic/208 usually.
I've started a "manual" bisect - isolated all commits from
v5.0..5.0.0-7, excluded all related with debian folder (and efi-
lockdown, due to their complexity) and I'm reverting in a binary
search fashion. Reverted 105 commits and still reproduced, and in the
next set I've failed to build.
I'll investigate the build fault and also I'll try to reproduce in a
Bionic VM with bionic-hwe kernel version 5.0 .
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