Re: [PATCH 2/4] fpga: add a platform driver to the FPGA Manager test suite
From: Ruan Jinjie
Date: Wed Sep 27 2023 - 23:42:17 EST
On 2023/9/28 0:56, Marco Pagani wrote:
>
>
> On 2023-09-27 04:55, Ruan Jinjie wrote:
>>
>>
>> On 2023/9/27 0:39, Marco Pagani wrote:
>>> Register a minimal platform driver associated with the parent platform
>>> device used for testing to prevent a null-ptr-deref when try_module_get()
>>> is called by fpga_mgr_get().
>>>
>>> Fixes: ccbc1c302115 ("fpga: add an initial KUnit suite for the FPGA Manager")
>>> Reported-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
>>> Signed-off-by: Marco Pagani <marpagan@xxxxxxxxxx>
>>> ---
>>> drivers/fpga/tests/fpga-mgr-test.c | 18 +++++++++++++++++-
>>> 1 file changed, 17 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/fpga/tests/fpga-mgr-test.c b/drivers/fpga/tests/fpga-mgr-test.c
>>> index 6acec55b60ce..30de474d7def 100644
>>> --- a/drivers/fpga/tests/fpga-mgr-test.c
>>> +++ b/drivers/fpga/tests/fpga-mgr-test.c
>>> @@ -14,6 +14,8 @@
>>> #include <linux/scatterlist.h>
>>> #include <linux/types.h>
>>>
>>> +#include "fpga-test-helpers.h"
>>> +
>>> #define HEADER_FILL 'H'
>>> #define IMAGE_FILL 'P'
>>> #define IMAGE_BLOCK 1024
>>> @@ -277,6 +279,18 @@ static void fpga_mgr_test_img_load_sgt(struct kunit *test)
>>> sg_free_table(ctx->img_info->sgt);
>>> }
>>>
>>> +TEST_PLATFORM_DRIVER(test_platform_driver);
>>> +
>>> +static int fpga_mgr_test_suite_init(struct kunit_suite *suite)
>>> +{
>>> + return platform_driver_register(&test_platform_driver);
>>
>> modprobe fpga-mgr-test and there is still a null-ptr-deref.
>
>
> These issues appear to be caused by your commit 2810c1e99867 ("kunit: Fix
> wild-memory-access bug in kunit_free_suite_set()") that causes all test
> suites to run while modules are still in MODULE_STATE_COMING. In that
> state, modules are not yet fully initialized lacking sysfs' kobjects
> and hence causing module_add_driver() to fail.
Right! it is the commit's issue.
>
> You can test it by running the FPGA suites on a kernel before commit
> 2810c1e99867. I sent an RFC patch to restore the normal execution
> flow and use the refcount to avoid calling kunit_free_suite_set() if
> load_module() fails.
I have a more elegant way to fix it, which split the init func into 2
parts and use the return error code to avoid check whether free is
empty. I'll send it sooner.
>
> Thanks,
> Marco
>
>
>>
>> root@syzkaller:~# modprobe fpga-mgr-test
>> [ 45.088127] KTAP version 1
>> [ 45.088354] 1..1
>> [ 45.089520] ------------[ cut here ]------------
>> [ 45.089861] kobject: '(null)' (ffffffffa02121d0): is not initialized,
>> yet kobject_get() is being called.
>> [ 45.090608] WARNING: CPU: 1 PID: 1862 at lib/kobject.c:637
>> kobject_get+0x98/0xe0
>> [ 45.091209] Modules linked in: fpga_mgr_test(+)
>> [ 45.091581] CPU: 1 PID: 1862 Comm: modprobe Tainted: G
>> N 6.6.0-rc3+ #54
>> [ 45.092201] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS 1.15.0-1 04/01/2014
>> [ 45.092870] RIP: 0010:kobject_get+0x98/0xe0
>> [ 45.093200] Code: 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03
>> 80 3c 02 00 75 44 49 8b 34 24 4c 89 e2 48 c7 c7 20 63 ac 84 e8 38 fe 24
>> fd <0f> 0b eb a2 48 89 ef be 01 00 00 00 e8 d7 de a4 fe 4c 89 e0 5d 41
>> [ 45.094653] RSP: 0018:ffff8881062f7298 EFLAGS: 00010286
>> [ 45.095086] RAX: 0000000000000000 RBX: ffffffff848a3660 RCX:
>> 0000000000000000
>> [ 45.095649] RDX: 0000000000000002 RSI: ffffffff847b4d40 RDI:
>> 0000000000000001
>> [ 45.096205] RBP: ffff888101b6d840 R08: 0000000000000001 R09:
>> ffffed1020c5ee12
>> [ 45.096761] R10: ffff8881062f7097 R11: 3a7463656a626f6b R12:
>> ffffffffa02121d0
>> [ 45.097315] R13: ffff888101b6d858 R14: ffffffffa02121d0 R15:
>> ffff88810661aca0
>> [ 45.097863] FS: 00007fabf4c34540(0000) GS:ffff888119c80000(0000)
>> knlGS:0000000000000000
>> [ 45.098485] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 45.098933] CR2: 000055578ca04e20 CR3: 000000010ac0e006 CR4:
>> 0000000000770ee0
>> [ 45.099497] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000
>> [ 45.100054] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
>> 0000000000000400
>> [ 45.100615] PKRU: 55555554
>> [ 45.100833] Call Trace:
>> [ 45.101034] <TASK>
>> [ 45.101206] ? __warn+0xc9/0x260
>> [ 45.101480] ? irq_work_queue+0x35/0x50
>> [ 45.101786] ? kobject_get+0x98/0xe0
>> [ 45.102073] ? report_bug+0x345/0x400
>> [ 45.102377] ? handle_bug+0x3c/0x70
>> [ 45.102661] ? exc_invalid_op+0x14/0x40
>> [ 45.102968] ? asm_exc_invalid_op+0x16/0x20
>> [ 45.103317] ? kobject_get+0x98/0xe0
>> [ 45.103604] ? kobject_get+0x98/0xe0
>> [ 45.103892] kobject_add_internal+0x9e/0x870
>> [ 45.104235] kobject_add+0x120/0x1f0
>> [ 45.104535] ? kset_create_and_add+0x160/0x160
>> [ 45.104892] ? __kmem_cache_alloc_node+0x1d2/0x350
>> [ 45.105269] ? _raw_spin_lock+0x87/0xe0
>> [ 45.105586] ? kobject_create_and_add+0x3c/0xb0
>> [ 45.105948] kobject_create_and_add+0x68/0xb0
>> [ 45.106303] module_add_driver+0x260/0x350
>> [ 45.106635] bus_add_driver+0x2c9/0x580
>> [ 45.106941] driver_register+0x133/0x460
>> [ 45.107284] kunit_run_tests+0xdb/0xef0
>> [ 45.107599] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.107962] ? __sched_text_end+0xa/0xa
>> [ 45.108284] ? _raw_spin_unlock_irqrestore+0x42/0x80
>> [ 45.108675] ? __kunit_test_suites_exit+0x80/0x80
>> [ 45.109045] ? set_track_prepare+0x8a/0xd0
>> [ 45.109380] ? get_object+0x70/0x70
>> [ 45.109658] ? alloc_inode+0x12a/0x1e0
>> [ 45.109960] ? new_inode+0x14/0x230
>> [ 45.110238] ? __debugfs_create_file+0xc8/0x5d0
>> [ 45.110607] ? __kunit_test_suites_init+0x73/0x140
>> [ 45.110982] ? kunit_module_notify+0x3ab/0x440
>> [ 45.111341] ? notifier_call_chain+0xbf/0x280
>> [ 45.111688] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.112045] ? __sched_text_end+0xa/0xa
>> [ 45.112362] ? projid_m_show+0x200/0x200
>> [ 45.112671] ? kasan_set_track+0x21/0x30
>> [ 45.112974] ? _raw_spin_lock+0x87/0xe0
>> [ 45.113290] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.113615] ? _raw_spin_lock+0x87/0xe0
>> [ 45.113914] ? __d_instantiate+0x1d5/0x3b0
>> [ 45.114232] ? alloc_inode+0x72/0x1e0
>> [ 45.114535] ? up_write+0x6d/0xa0
>> [ 45.114803] ? __debugfs_create_file+0x3b5/0x5d0
>> [ 45.115180] __kunit_test_suites_init+0xde/0x140
>> [ 45.115557] kunit_module_notify+0x3ab/0x440
>> [ 45.115895] ? __kunit_test_suites_init+0x140/0x140
>> [ 45.116287] ? preempt_count_add+0x79/0x150
>> [ 45.116623] notifier_call_chain+0xbf/0x280
>> [ 45.116953] ? kasan_quarantine_put+0x21/0x1a0
>> [ 45.117311] blocking_notifier_call_chain_robust+0xbb/0x140
>> [ 45.117747] ? notifier_call_chain+0x280/0x280
>> [ 45.118097] ? 0xffffffffa0208000
>> [ 45.118372] load_module+0x4af0/0x67d0
>> [ 45.118671] ? module_frob_arch_sections+0x20/0x20
>> [ 45.119057] ? rwsem_down_write_slowpath+0x11a0/0x11a0
>> [ 45.119476] ? kernel_read_file+0x3ca/0x510
>> [ 45.119807] ? __x64_sys_fspick+0x2a0/0x2a0
>> [ 45.120134] ? init_module_from_file+0xd2/0x130
>> [ 45.120499] init_module_from_file+0xd2/0x130
>> [ 45.120843] ? __ia32_sys_init_module+0xa0/0xa0
>> [ 45.121203] ? userfaultfd_unmap_prep+0x3d0/0x3d0
>> [ 45.121589] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.121916] idempotent_init_module+0x339/0x610
>> [ 45.122286] ? init_module_from_file+0x130/0x130
>> [ 45.122648] ? __fget_light+0x57/0x500
>> [ 45.122950] __x64_sys_finit_module+0xba/0x130
>> [ 45.123323] do_syscall_64+0x35/0x80
>> [ 45.123607] entry_SYSCALL_64_after_hwframe+0x46/0xb0
>> [ 45.124001] RIP: 0033:0x7fabf471b839
>> [ 45.124303] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00
>> 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f
>> 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
>> [ 45.125754] RSP: 002b:00007ffd1f377128 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000139
>> [ 45.126359] RAX: ffffffffffffffda RBX: 000055578e370e10 RCX:
>> 00007fabf471b839
>> [ 45.126921] RDX: 0000000000000000 RSI: 000055578ca1bc2e RDI:
>> 0000000000000003
>> [ 45.127505] RBP: 000055578ca1bc2e R08: 0000000000000000 R09:
>> 000055578e373210
>> [ 45.128057] R10: 0000000000000003 R11: 0000000000000246 R12:
>> 0000000000000000
>> [ 45.128621] R13: 000055578e370f30 R14: 0000000000040000 R15:
>> 000055578e370e10
>> [ 45.129183] </TASK>
>> [ 45.129376] ---[ end trace 0000000000000000 ]---
>> [ 45.129744] ------------[ cut here ]------------
>> [ 45.130109] refcount_t: addition on 0; use-after-free.
>> [ 45.130555] WARNING: CPU: 1 PID: 1862 at lib/refcount.c:25
>> refcount_warn_saturate+0x120/0x190
>> [ 45.131214] Modules linked in: fpga_mgr_test(+)
>> [ 45.131588] CPU: 1 PID: 1862 Comm: modprobe Tainted: G W
>> N 6.6.0-rc3+ #54
>> [ 45.132205] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS 1.15.0-1 04/01/2014
>> [ 45.132854] RIP: 0010:refcount_warn_saturate+0x120/0x190
>> [ 45.133262] Code: 1d bc 3f 40 0a 80 fb 01 0f 87 5a f8 67 01 83 e3 01
>> 0f 85 5d ff ff ff 48 c7 c7 e0 99 7a 84 c6 05 9c 3f 40 0a 01 e8 30 1e 80
>> fe <0f> 0b e9 43 ff ff ff 0f b6 1d 86 3f 40 0a 80 fb 01 0f 87 4f f8 67
>> [ 45.134712] RSP: 0018:ffff8881062f7280 EFLAGS: 00010286
>> [ 45.135138] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
>> 0000000000000000
>> [ 45.135698] RDX: 0000000000000002 RSI: ffffffff847b4d40 RDI:
>> 0000000000000001
>> [ 45.136244] RBP: 0000000000000002 R08: 0000000000000001 R09:
>> ffffed1020c5ee0f
>> [ 45.136804] R10: ffff8881062f707f R11: 746e756f63666572 R12:
>> ffffffffa02121d0
>> [ 45.137367] R13: ffff888101b6d858 R14: ffffffffa02121d0 R15:
>> ffff88810661aca0
>> [ 45.137919] FS: 00007fabf4c34540(0000) GS:ffff888119c80000(0000)
>> knlGS:0000000000000000
>> [ 45.138551] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 45.139007] CR2: 000055578ca04e20 CR3: 000000010ac0e006 CR4:
>> 0000000000770ee0
>> [ 45.139566] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000
>> [ 45.140116] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
>> 0000000000000400
>> [ 45.140669] PKRU: 55555554
>> [ 45.140882] Call Trace:
>> [ 45.141084] <TASK>
>> [ 45.141254] ? __warn+0xc9/0x260
>> [ 45.141520] ? refcount_warn_saturate+0x120/0x190
>> [ 45.141889] ? report_bug+0x345/0x400
>> [ 45.142176] ? handle_bug+0x3c/0x70
>> [ 45.142461] ? exc_invalid_op+0x14/0x40
>> [ 45.142767] ? asm_exc_invalid_op+0x16/0x20
>> [ 45.143101] ? refcount_warn_saturate+0x120/0x190
>> [ 45.143474] kobject_get+0xbd/0xe0
>> [ 45.143745] kobject_add_internal+0x9e/0x870
>> [ 45.144084] kobject_add+0x120/0x1f0
>> [ 45.144378] ? kset_create_and_add+0x160/0x160
>> [ 45.144732] ? __kmem_cache_alloc_node+0x1d2/0x350
>> [ 45.145109] ? _raw_spin_lock+0x87/0xe0
>> [ 45.145426] ? kobject_create_and_add+0x3c/0xb0
>> [ 45.145787] kobject_create_and_add+0x68/0xb0
>> [ 45.146130] module_add_driver+0x260/0x350
>> [ 45.146465] bus_add_driver+0x2c9/0x580
>> [ 45.146762] driver_register+0x133/0x460
>> [ 45.147084] kunit_run_tests+0xdb/0xef0
>> [ 45.147404] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.147754] ? __sched_text_end+0xa/0xa
>> [ 45.148056] ? _raw_spin_unlock_irqrestore+0x42/0x80
>> [ 45.148456] ? __kunit_test_suites_exit+0x80/0x80
>> [ 45.148817] ? set_track_prepare+0x8a/0xd0
>> [ 45.149145] ? get_object+0x70/0x70
>> [ 45.149425] ? alloc_inode+0x12a/0x1e0
>> [ 45.149716] ? new_inode+0x14/0x230
>> [ 45.149989] ? __debugfs_create_file+0xc8/0x5d0
>> [ 45.150347] ? __kunit_test_suites_init+0x73/0x140
>> [ 45.150724] ? kunit_module_notify+0x3ab/0x440
>> [ 45.151074] ? notifier_call_chain+0xbf/0x280
>> [ 45.151420] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.151772] ? __sched_text_end+0xa/0xa
>> [ 45.152079] ? projid_m_show+0x200/0x200
>> [ 45.152403] ? kasan_set_track+0x21/0x30
>> [ 45.152712] ? _raw_spin_lock+0x87/0xe0
>> [ 45.153010] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.153333] ? _raw_spin_lock+0x87/0xe0
>> [ 45.153635] ? __d_instantiate+0x1d5/0x3b0
>> [ 45.153953] ? alloc_inode+0x72/0x1e0
>> [ 45.154235] ? up_write+0x6d/0xa0
>> [ 45.154509] ? __debugfs_create_file+0x3b5/0x5d0
>> [ 45.154869] __kunit_test_suites_init+0xde/0x140
>> [ 45.155222] kunit_module_notify+0x3ab/0x440
>> [ 45.155560] ? __kunit_test_suites_init+0x140/0x140
>> [ 45.155938] ? preempt_count_add+0x79/0x150
>> [ 45.156259] notifier_call_chain+0xbf/0x280
>> [ 45.156591] ? kasan_quarantine_put+0x21/0x1a0
>> [ 45.156937] blocking_notifier_call_chain_robust+0xbb/0x140
>> [ 45.157371] ? notifier_call_chain+0x280/0x280
>> [ 45.157713] ? 0xffffffffa0208000
>> [ 45.157967] load_module+0x4af0/0x67d0
>> [ 45.158255] ? module_frob_arch_sections+0x20/0x20
>> [ 45.158630] ? rwsem_down_write_slowpath+0x11a0/0x11a0
>> [ 45.159025] ? kernel_read_file+0x3ca/0x510
>> [ 45.159353] ? __x64_sys_fspick+0x2a0/0x2a0
>> [ 45.159673] ? init_module_from_file+0xd2/0x130
>> [ 45.160014] init_module_from_file+0xd2/0x130
>> [ 45.160356] ? __ia32_sys_init_module+0xa0/0xa0
>> [ 45.160702] ? userfaultfd_unmap_prep+0x3d0/0x3d0
>> [ 45.161058] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.161386] idempotent_init_module+0x339/0x610
>> [ 45.161727] ? init_module_from_file+0x130/0x130
>> [ 45.162081] ? __fget_light+0x57/0x500
>> [ 45.162378] __x64_sys_finit_module+0xba/0x130
>> [ 45.162720] do_syscall_64+0x35/0x80
>> [ 45.162989] entry_SYSCALL_64_after_hwframe+0x46/0xb0
>> [ 45.163380] RIP: 0033:0x7fabf471b839
>> [ 45.163655] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00
>> 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f
>> 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
>> [ 45.165049] RSP: 002b:00007ffd1f377128 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000139
>> [ 45.165627] RAX: ffffffffffffffda RBX: 000055578e370e10 RCX:
>> 00007fabf471b839
>> [ 45.166168] RDX: 0000000000000000 RSI: 000055578ca1bc2e RDI:
>> 0000000000000003
>> [ 45.166733] RBP: 000055578ca1bc2e R08: 0000000000000000 R09:
>> 000055578e373210
>> [ 45.167297] R10: 0000000000000003 R11: 0000000000000246 R12:
>> 0000000000000000
>> [ 45.167847] R13: 000055578e370f30 R14: 0000000000040000 R15:
>> 000055578e370e10
>> [ 45.168404] </TASK>
>> [ 45.168579] ---[ end trace 0000000000000000 ]---
>> [ 45.168952] general protection fault, probably for non-canonical
>> address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
>> [ 45.169771] KASAN: null-ptr-deref in range
>> [0x0000000000000018-0x000000000000001f]
>> [ 45.170336] CPU: 1 PID: 1862 Comm: modprobe Tainted: G W
>> N 6.6.0-rc3+ #54
>> [ 45.170935] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS 1.15.0-1 04/01/2014
>> [ 45.171562] RIP: 0010:kobject_namespace+0x71/0x150
>> [ 45.171933] Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cd 00 00 00 48
>> b8 00 00 00 00 00 fc ff df 49 8b 5c 24 28 48 8d 7b 18 48 89 fa 48 c1 ea
>> 03 <80> 3c 02 00 0f 85 c1 00 00 00 48 8b 43 18 48 85 c0 74 79 4c 89 e7
>> [ 45.173324] RSP: 0018:ffff8881062f7288 EFLAGS: 00010206
>> [ 45.173716] RAX: dffffc0000000000 RBX: 0000000000000000 RCX:
>> 0000000000000000
>> [ 45.174245] RDX: 0000000000000003 RSI: ffffffff847b4d40 RDI:
>> 0000000000000018
>> [ 45.174777] RBP: ffff888101b6d840 R08: 0000000000000001 R09:
>> ffffed1020c5ee0f
>> [ 45.175317] R10: ffff8881062f707f R11: 746e756f63666572 R12:
>> ffffffffa02121d0
>> [ 45.175847] R13: ffff888101b6d858 R14: ffff888101b6d868 R15:
>> ffffffff84ac7020
>> [ 45.176377] FS: 00007fabf4c34540(0000) GS:ffff888119c80000(0000)
>> knlGS:0000000000000000
>> [ 45.176977] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 45.177413] CR2: 000055578ca04e20 CR3: 000000010ac0e006 CR4:
>> 0000000000770ee0
>> [ 45.177946] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000
>> [ 45.178479] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
>> 0000000000000400
>> [ 45.179016] PKRU: 55555554
>> [ 45.179227] Call Trace:
>> [ 45.179418] <TASK>
>> [ 45.179584] ? die_addr+0x3d/0xa0
>> [ 45.179843] ? exc_general_protection+0x144/0x220
>> [ 45.180202] ? asm_exc_general_protection+0x22/0x30
>> [ 45.180570] ? kobject_namespace+0x71/0x150
>> [ 45.180886] kobject_add_internal+0x267/0x870
>> [ 45.181221] kobject_add+0x120/0x1f0
>> [ 45.181497] ? kset_create_and_add+0x160/0x160
>> [ 45.181828] ? __kmem_cache_alloc_node+0x1d2/0x350
>> [ 45.182188] ? _raw_spin_lock+0x87/0xe0
>> [ 45.182480] ? kobject_create_and_add+0x3c/0xb0
>> [ 45.182822] kobject_create_and_add+0x68/0xb0
>> [ 45.183159] module_add_driver+0x260/0x350
>> [ 45.183472] bus_add_driver+0x2c9/0x580
>> [ 45.183764] driver_register+0x133/0x460
>> [ 45.184061] kunit_run_tests+0xdb/0xef0
>> [ 45.184354] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.184700] ? __sched_text_end+0xa/0xa
>> [ 45.184993] ? _raw_spin_unlock_irqrestore+0x42/0x80
>> [ 45.185365] ? __kunit_test_suites_exit+0x80/0x80
>> [ 45.185718] ? set_track_prepare+0x8a/0xd0
>> [ 45.186027] ? get_object+0x70/0x70
>> [ 45.186296] ? alloc_inode+0x12a/0x1e0
>> [ 45.186578] ? new_inode+0x14/0x230
>> [ 45.186848] ? __debugfs_create_file+0xc8/0x5d0
>> [ 45.187199] ? __kunit_test_suites_init+0x73/0x140
>> [ 45.187563] ? kunit_module_notify+0x3ab/0x440
>> [ 45.187905] ? notifier_call_chain+0xbf/0x280
>> [ 45.188232] ? _raw_spin_lock_irqsave+0x8d/0xe0
>> [ 45.188574] ? __sched_text_end+0xa/0xa
>> [ 45.188862] ? projid_m_show+0x200/0x200
>> [ 45.189158] ? kasan_set_track+0x21/0x30
>> [ 45.189457] ? _raw_spin_lock+0x87/0xe0
>> [ 45.189747] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.190054] ? _raw_spin_lock+0x87/0xe0
>> [ 45.190345] ? __d_instantiate+0x1d5/0x3b0
>> [ 45.190657] ? alloc_inode+0x72/0x1e0
>> [ 45.190935] ? up_write+0x6d/0xa0
>> [ 45.191191] ? __debugfs_create_file+0x3b5/0x5d0
>> [ 45.191545] __kunit_test_suites_init+0xde/0x140
>> [ 45.191904] kunit_module_notify+0x3ab/0x440
>> [ 45.192226] ? __kunit_test_suites_init+0x140/0x140
>> [ 45.192601] ? preempt_count_add+0x79/0x150
>> [ 45.192927] notifier_call_chain+0xbf/0x280
>> [ 45.193244] ? kasan_quarantine_put+0x21/0x1a0
>> [ 45.193586] blocking_notifier_call_chain_robust+0xbb/0x140
>> [ 45.194015] ? notifier_call_chain+0x280/0x280
>> [ 45.194360] ? 0xffffffffa0208000
>> [ 45.194614] load_module+0x4af0/0x67d0
>> [ 45.194909] ? module_frob_arch_sections+0x20/0x20
>> [ 45.195274] ? rwsem_down_write_slowpath+0x11a0/0x11a0
>> [ 45.195672] ? kernel_read_file+0x3ca/0x510
>> [ 45.195997] ? __x64_sys_fspick+0x2a0/0x2a0
>> [ 45.196319] ? init_module_from_file+0xd2/0x130
>> [ 45.196675] init_module_from_file+0xd2/0x130
>> [ 45.197006] ? __ia32_sys_init_module+0xa0/0xa0
>> [ 45.197352] ? userfaultfd_unmap_prep+0x3d0/0x3d0
>> [ 45.197724] ? _raw_spin_lock_bh+0xe0/0xe0
>> [ 45.198044] idempotent_init_module+0x339/0x610
>> [ 45.198392] ? init_module_from_file+0x130/0x130
>> [ 45.198748] ? __fget_light+0x57/0x500
>> [ 45.199043] __x64_sys_finit_module+0xba/0x130
>> [ 45.199389] do_syscall_64+0x35/0x80
>> [ 45.199664] entry_SYSCALL_64_after_hwframe+0x46/0xb0
>> [ 45.200050] RIP: 0033:0x7fabf471b839
>> [ 45.200325] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00
>> 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f
>> 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
>> [ 45.201713] RSP: 002b:00007ffd1f377128 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000139
>> [ 45.202278] RAX: ffffffffffffffda RBX: 000055578e370e10 RCX:
>> 00007fabf471b839
>> [ 45.202816] RDX: 0000000000000000 RSI: 000055578ca1bc2e RDI:
>> 0000000000000003
>> [ 45.203348] RBP: 000055578ca1bc2e R08: 0000000000000000 R09:
>> 000055578e373210
>> [ 45.203886] R10: 0000000000000003 R11: 0000000000000246 R12:
>> 0000000000000000
>> [ 45.204426] R13: 000055578e370f30 R14: 0000000000040000 R15:
>> 000055578e370e10
>> [ 45.204962] </TASK>
>> [ 45.205140] Modules linked in: fpga_mgr_test(+)
>> [ 45.205500] Dumping ftrace buffer:
>> [ 45.205768] (ftrace buffer empty)
>> [ 45.206066] ---[ end trace 0000000000000000 ]---
>> [ 45.206477] RIP: 0010:kobject_namespace+0x71/0x150
>> [ 45.206850] Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cd 00 00 00 48
>> b8 00 00 00 00 00 fc ff df 49 8b 5c 24 28 48 8d 7b 18 48 89 fa 48 c1 ea
>> 03 <80> 3c 02 00 0f 85 c1 00 00 00 48 8b 43 18 48 85 c0 74 79 4c 89 e7
>> [ 45.208501] RSP: 0018:ffff8881062f7288 EFLAGS: 00010206
>> [ 45.209015] RAX: dffffc0000000000 RBX: 0000000000000000 RCX:
>> 0000000000000000
>> [ 45.209708] RDX: 0000000000000003 RSI: ffffffff847b4d40 RDI:
>> 0000000000000018
>> [ 45.210473] RBP: ffff888101b6d840 R08: 0000000000000001 R09:
>> ffffed1020c5ee0f
>> [ 45.211142] R10: ffff8881062f707f R11: 746e756f63666572 R12:
>> ffffffffa02121d0
>> [ 45.211898] R13: ffff888101b6d858 R14: ffff888101b6d868 R15:
>> ffffffff84ac7020
>> [ 45.212653] FS: 00007fabf4c34540(0000) GS:ffff888119c80000(0000)
>> knlGS:0000000000000000
>> [ 45.213441] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 45.213970] CR2: 000055578ca04e20 CR3: 000000010ac0e006 CR4:
>> 0000000000770ee0
>> [ 45.214716] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000
>> [ 45.215424] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
>> 0000000000000400
>> [ 45.216089] PKRU: 55555554
>> [ 45.216440] Kernel panic - not syncing: Fatal exception
>> [ 45.217935] Dumping ftrace buffer:
>> [ 45.218195] (ftrace buffer empty)
>> [ 45.218473] Kernel Offset: disabled
>> [ 45.218740] Rebooting in 1 seconds..
>>
>>> +}
>>> +
>>> +static void fpga_mgr_test_suite_exit(struct kunit_suite *suite)
>>> +{
>>> + platform_driver_unregister(&test_platform_driver);
>>> +}
>>> +
>>> static int fpga_mgr_test_init(struct kunit *test)
>>> {
>>> struct mgr_ctx *ctx;
>>> @@ -284,7 +298,7 @@ static int fpga_mgr_test_init(struct kunit *test)
>>> ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
>>> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
>>>
>>> - ctx->pdev = platform_device_register_simple("mgr_pdev", PLATFORM_DEVID_AUTO, NULL, 0);
>>> + ctx->pdev = platform_device_register_simple(TEST_PDEV_NAME, PLATFORM_DEVID_AUTO, NULL, 0);
>>> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->pdev);
>>>
>>> ctx->mgr = devm_fpga_mgr_register(&ctx->pdev->dev, "Fake FPGA Manager", &fake_mgr_ops,
>>> @@ -317,6 +331,8 @@ static struct kunit_case fpga_mgr_test_cases[] = {
>>>
>>> static struct kunit_suite fpga_mgr_suite = {
>>> .name = "fpga_mgr",
>>> + .suite_init = fpga_mgr_test_suite_init,
>>> + .suite_exit = fpga_mgr_test_suite_exit,
>>> .init = fpga_mgr_test_init,
>>> .exit = fpga_mgr_test_exit,
>>> .test_cases = fpga_mgr_test_cases,
>>
>