This bug was fixed in the package linux-oem - 4.15.0-1050.57
---------------
linux-oem (4.15.0-1050.57) bionic; urgency=medium
* bionic/linux-oem: 4.15.0-1050.57 -proposed tracker (LP: #1839261)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
[ Ubuntu: 4.15.0-58.64 ]
* unable to handle kernel NULL pointer dereference at 000000000000002c (IP:
iget5_locked+0x9e/0x1f0) (LP: #1838982)
- Revert "ovl: set I_CREATING on inode being created"
- Revert "new primitive: discard_new_inode()"
-- Chia-Lin Kao (AceLan) <acelan....@canonical.com> Wed, 07 Aug 2019
18:14:17 +0800
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https://bugs.launchpad.net/bugs/1838982
Title:
unable to handle kernel NULL pointer dereference at 000000000000002c
(IP: iget5_locked+0x9e/0x1f0)
Status in HWE Next:
In Progress
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem package in Ubuntu:
New
Status in linux source package in Bionic:
Fix Released
Status in linux-oem source package in Bionic:
Fix Released
Bug description:
Crash happens during the setup (dpkg) phase of sbuild using a
overlayfs based chroot with the current bionic-proposed kernel
(4.15.0-56-generic #62-Ubuntu).
[25553.379381] ? ovl_get_origin_fh+0x23/0x150 [overlay]
[25553.379386] ? ovl_inode_test+0x20/0x20 [overlay]
[25553.379390] ? ovl_lock_rename_workdir+0x50/0x50 [overlay]
[25553.379396] ovl_get_inode+0xa2/0x450 [overlay]
[25553.379401] ovl_lookup+0x275/0x760 [overlay]
[25553.379406] lookup_slow+0xab/0x170
[25553.379409] ? lookup_slow+0xab/0x170
[25553.379413] walk_component+0x1c3/0x470
[25553.379416] ? path_init+0x177/0x2f0
[25553.379419] path_lookupat+0x84/0x1f0
[25553.379423] ? __put_cred+0x3d/0x50
[25553.379426] ? revert_creds+0x2f/0x40
[25553.379429] filename_lookup+0xb6/0x190
[25553.379434] ? __check_object_size+0xaf/0x1b0
[25553.379438] user_path_at_empty+0x36/0x40
[25553.379441] ? user_path_at_empty+0x36/0x40
[25553.379444] SyS_chown+0x4d/0xe0
[25553.379449] do_syscall_64+0x73/0x130
[25553.379453] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
SRU justication:
=============
[Impact]
Crash happens during the setup (dpkg) phase of sbuild using a overlayfs
based chroot with the current bionic-proposed kernel (4.15.0-56-generic
#62-Ubuntu).
[Fix]
Fix protential NULL in overlay fs.
[Test]
Verified on fs test and dpkg installation on overlayfs.
[Regression Potential]
Low, remove regression of previous bionic kernel.
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