armv5: boot failed with KUNIT tests- PC is at drm_gem_private_object_init

[Naresh Kamboju <naresh.kamboju@linaro.org>]

Following regressions found on Linux next-20230721 tag while booting qemu-armv5
with Kunit tests enabled.

Regressions found on qemu-armv5:

 - boot/clang-nightly-multi_v5_defconfig-65236a87
 - boot/gcc-12-multi_v5_defconfig-65236a87
 - boot/clang-16-multi_v5_defconfig-65236a87


Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

Logs:
-----
<6>ok 69 drm_rect
<6>    KTAP version 1
<6>    # Subtest: drm_exec
<6>    1..6
<6>    ok 1 sanitycheck
<1>8<--- cut here ---
<1>Unable to handle kernel NULL pointer dereference at virtual address
0000005c when read
<1>[0000005c] *pgd=00000000
<0>Internal error: Oops: 5 [#1] PREEMPT ARM
<4>Modules linked in:
<4>CPU: 0 PID: 1446 Comm: kunit_try_catch Tainted: G        W        N
6.5.0-rc2-next-20230721 #1
<4>Hardware name: ARM-Versatile (Device Tree Support)
<4>PC is at drm_gem_private_object_init+0x58/0x90
<4>LR is at dma_resv_init+0x1c/0x30
<4>pc : [<c059484c>]    lr : [<c0648b8c>]    psr: 60000113
<4>sp : d0c5de40  ip : d0c5de98  fp : 00000000
<4>r10: 00000000  r9 : c0370874  r8 : d0811d50
<4>r7 : c1db06c0  r6 : d0c5df34  r5 : c1194b78  r4 : d0c5de98
<4>r3 : 00000000  r2 : 00000078  r1 : 00000000  r0 : 00000000
<4>Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
<4>Control: 00093177  Table: 00004000  DAC: 00000053
<1>Register r0 information: NULL pointer
<1>Register r1 information: NULL pointer
<1>Register r2 information: non-paged memory
<1>Register r3 information: NULL pointer
<1>Register r4 information: 2-page vmalloc region starting at
0xd0c5c000 allocated at copy_process+0x174/0xdd0
<1>Register r5 information: non-slab/vmalloc memory
<1>Register r6 information: 2-page vmalloc region starting at
0xd0c5c000 allocated at copy_process+0x174/0xdd0
<1>Register r7 information: slab kmalloc-32 start c1db06c0 pointer
offset 0 size 32
<1>Register r8 information: 2-page vmalloc region starting at
0xd0810000 allocated at copy_process+0x174/0xdd0
<1>Register r9 information: non-slab/vmalloc memory
<1>Register r10 information: NULL pointer
<1>Register r11 information: NULL pointer
<1>Register r12 information: 2-page vmalloc region starting at
0xd0c5c000 allocated at copy_process+0x174/0xdd0
<0>Process kunit_try_catch (pid: 1446, stack limit = 0x919109bb)
<0>Stack: (0xd0c5de40 to 0xd0c5e000)
...
<0> drm_gem_private_object_init from test_lock+0x50/0x110
<0> test_lock from kunit_generic_run_threadfn_adapter+0x14/0x20
<0> kunit_generic_run_threadfn_adapter from kthread+0xe8/0x118
<0> kthread from ret_from_fork+0x14/0x2c
<0>Exception stack(0xd0c5dfb0 to 0xd0c5dff8)
<0>dfa0:                                     00000000 00000000 00000000 00000000
<0>dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<0>dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
<0>Code: e3500000 05846098 e5950018 e5951034 (e590005c)
<4>---[ end trace 0000000000000000 ]---
<3>    # test_lock: try timed out
<4>------------[ cut here ]------------
<4>WARNING: CPU: 0 PID: 1 at lib/refcount.c:25 kthread_stop+0xf8/0x12c
<4>refcount_t: addition on 0; use-after-free.
<4>Modules linked in:
<4>CPU: 0 PID: 1 Comm: swapper Tainted: G      D W        N
6.5.0-rc2-next-20230721 #1
<4>Hardware name: ARM-Versatile (Device Tree Support)
<4> unwind_backtrace from show_stack+0x10/0x14
<4> show_stack from dump_stack_lvl+0x2c/0x34
<4> dump_stack_lvl from __warn+0xb8/0x198
<4> __warn from warn_slowpath_fmt+0xb4/0x160
<4> warn_slowpath_fmt from kthread_stop+0xf8/0x12c
<4> kthread_stop from kunit_try_catch_run+0x110/0x160
<4> kunit_try_catch_run from kunit_run_tests+0x2d4/0x794
<4> kunit_run_tests from __kunit_test_suites_init+0xac/0x168
<4> __kunit_test_suites_init from kunit_run_all_tests+0xa8/0x244
<4> kunit_run_all_tests from kernel_init_freeable+0x98/0xf0
<4> kernel_init_freeable from kernel_init+0x10/0x17c
<4> kernel_init from ret_from_fork+0x14/0x2c
<4>Exception stack(0xd0811fb0 to 0xd0811ff8)
<4>1fa0:                                     00000000 00000000 00000000 00000000
<4>1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<4>1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
<4>---[ end trace 0000000000000000 ]---
<1>8<--- cut here ---
<1>Unable to handle kernel NULL pointer dereference at virtual address
00000000 when read
<1>[00000000] *pgd=00000000
<0>Internal error: Oops: 5 [#2] PREEMPT ARM
<4>Modules linked in:
<4>CPU: 0 PID: 1 Comm: swapper Tainted: G      D W        N
6.5.0-rc2-next-20230721 #1
<4>Hardware name: ARM-Versatile (Device Tree Support)
<4>PC is at kthread_stop+0x58/0x12c
<4>LR is at __warn+0x12c/0x198
<4>pc : [<c0040b8c>]    lr : [<c001fbbc>]    psr: 20000193
<4>sp : d0811cc8  ip : 60000113  fp : 00000001
<4>r10: d0811d5c  r9 : d0811d50  r8 : 00000001
<4>r7 : 00000000  r6 : 00000000  r5 : c1d8c780  r4 : c1d8c910
<4>r3 : 00000200  r2 : 00000000  r1 : 20000193  r0 : 20000113
<4>Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
<4>Control: 00093177  Table: 00004000  DAC: 00000053
<1>Register r0 information: non-paged memory
<1>Register r1 information: non-paged memory
<1>Register r2 information: NULL pointer
<1>Register r3 information: non-paged memory
<1>Register r4 information: slab task_struct start c1d8c780 pointer
offset 400 size 1664
<1>Register r5 information: slab task_struct start c1d8c780 pointer
offset 0 size 1664
<1>Register r6 information: NULL pointer
<1>Register r7 information: NULL pointer
<1>Register r8 information: non-paged memory
<1>Register r9 information: 2-page vmalloc region starting at
0xd0810000 allocated at copy_process+0x174/0xdd0
<1>Register r10 information: 2-page vmalloc region starting at
0xd0810000 allocated at copy_process+0x174/0xdd0
<1>Register r11 information: non-paged memory
<1>Register r12 information: non-paged memory
<0>Process swapper (pid: 1, stack limit = 0x541f52e4)
<0>Stack: (0xd0811cc8 to 0xd0812000)

...
<0> kthread_stop from kunit_try_catch_run+0x110/0x160
<0> kunit_try_catch_run from kunit_run_tests+0x2d4/0x794
<0> kunit_run_tests from __kunit_test_suites_init+0xac/0x168
<0> __kunit_test_suites_init from kunit_run_all_tests+0xa8/0x244
<0> kunit_run_all_tests from kernel_init_freeable+0x98/0xf0
<0> kernel_init_freeable from kernel_init+0x10/0x17c
<0> kernel_init from ret_from_fork+0x14/0x2c
<0>Exception stack(0xd0811fb0 to 0xd0811ff8)
<0>1fa0:                                     00000000 00000000 00000000 00000000
<0>1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<0>1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
<0>Code: e5956418 e10f0000 e3801080 e121f001 (e5961000)
<4>---[ end trace 0000000000000000 ]---
<6>note: swapper[1] exited with irqs disabled
<0>Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
<0>---[ end Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b ]---



Links,
------
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230721/testrun/18492909/suite/boot/test/clang-16-multi_v5_defconfig-65236a87/log
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230721/testrun/18492909/suite/boot/test/clang-16-multi_v5_defconfig-65236a87/history/
 - vmlinux: https://storage.tuxsuite.com/public/linaro/lkft/builds/2Srmz9NGn2sjobuzFKo0j7pRPMt/vmlinux.xz
 - System.map: https://storage.tuxsuite.com/public/linaro/lkft/builds/2Srmz9NGn2sjobuzFKo0j7pRPMt/System.map


# To install tuxrun to your home directory at ~/.local/bin:
# pip3 install -U --user tuxrun==0.45.0
#
# Or install a deb/rpm depending on the running distribution
# See https://tuxmake.org/install-deb/ or
# https://tuxmake.org/install-rpm/
#
# See https://tuxrun.org/ for complete documentation.
#
# Please follow the additional instructions if the tests are related to FVP:
# https://tuxrun.org/run-fvp/
#

tuxrun --runtime podman \
  --device qemu-armv5 \
  --kernel https://storage.tuxsuite.com/public/linaro/lkft/builds/2Srmz9NGn2sjobuzFKo0j7pRPMt/zImage
\
  --modules https://storage.tuxsuite.com/public/linaro/lkft/builds/2Srmz9NGn2sjobuzFKo0j7pRPMt/modules.tar.xz
\
  --parameters SKIPFILE=skipfile-lkft.yaml \
  --image docker.io/linaro/tuxrun-dispatcher:v0.45.0 \
  --tests kunit \
  --timeouts boot=30


--
Linaro LKFT
https://lkft.linaro.org