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SubjectBUG: kernel NULL pointer dereference, address: 00 - ida_free+0x76/0x140
Regression reported on Linux next 5.6.0-rc4-next-20200305 on x86_64,
i386, arm and arm64. The steps to reproduce is running kselftests lib
printf.sh test case.
Which is doing modprobe operations.

BTW, there are few RCU warnings from the boot log.
Please refer below link for more details.

Steps reproduce by using kselftests,

- lsmod || true
- cd /opt/kselftests/default-in-kernel/lib/
- export PATH=/opt/kselftests/default-in-kernel/kselftest:$PATH
- ./printf.sh || true
- ./bitmap.sh || true
- ./prime_numbers.sh || true
- ./strscpy.sh || true

x86_64 kernel BUG dump.
+ ./printf.sh
[ 32.594369] test_printf: loaded.
[ 32.599859] BUG: kernel NULL pointer dereference, address: 00000000
[ 32.606143] #PF: supervisor read access in kernel mode
[ 32.611280] #PF: error_code(0x0000) - not-present page
[ 32.616419] *pde = 00000000
[ 32.619306] Oops: 0000 [#1] SMP
[ 32.622452] CPU: 0 PID: 387 Comm: modprobe Not tainted
5.6.0-rc4-next-20200305 #1
[ 32.629928] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 32.637314] EIP: ida_free+0x61/0x130
[ 32.640891] Code: 00 c7 45 e8 00 00 00 00 c7 45 ec 00 00 00 00 0f
88 c4 00 00 00 89 d3 e8 9d ee 01 00 89 c7 8d 45 d8 e8 e3 18 01 00 a8
01 75 3f <0f> a3 30 72 72 8b 45 d8 89 fa e8 70 f0 01 00 53 68 d8 61 01
d3 e8
[ 32.659628] EAX: 00000000 EBX: 00000000 ECX: ffffffff EDX: 00000000
[ 32.665887] ESI: 00000000 EDI: 00000246 EBP: f21a7cc8 ESP: f21a7c9c
[ 32.672153] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010046
[ 32.678928] CR0: 80050033 CR2: 00000000 CR3: 32ff3000 CR4: 003406d0
[ 32.685186] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 32.691442] DR6: fffe0ff0 DR7: 00000400
[ 32.695273] Call Trace:
[ 32.697721] software_node_release+0x21/0x80
[ 32.701990] kobject_put+0xa8/0x1c0
[ 32.705476] kobject_del+0x40/0x60
[ 32.708881] kobject_put+0x92/0x1c0
[ 32.712380] fwnode_remove_software_node+0x30/0x50
[ 32.717201] software_node_unregister_nodes+0x2b/0x50
[ 32.722246] test_printf_init+0xe00/0x1d29 [test_printf]
[ 32.727563] ? find_held_lock+0x27/0xa0
[ 32.731423] ? test_hashed+0x54/0x54 [test_printf]
[ 32.736207] ? test_hashed+0x54/0x54 [test_printf]
[ 32.741001] do_one_initcall+0x54/0x2e0
[ 32.744841] ? rcu_read_lock_sched_held+0x47/0x70
[ 32.749547] ? kmem_cache_alloc_trace+0x285/0x2b0
[ 32.754249] ? do_init_module+0x21/0x1ef
[ 32.758166] ? do_init_module+0x21/0x1ef
[ 32.762087] do_init_module+0x50/0x1ef
[ 32.765837] load_module+0x1e32/0x2540
[ 32.769586] ? kernel_read_file+0x295/0x2d0
[ 32.773771] sys_finit_module+0x8a/0xe0
[ 32.777611] do_fast_syscall_32+0x8e/0x340
[ 32.781709] entry_SYSENTER_32+0xaa/0x102
[ 32.785719] EIP: 0xb7f75ce1
[ 32.788508] Code: 5e 5d c3 8d b6 00 00 00 00 b8 40 42 0f 00 eb c1
8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 51 52 55 89 e5 0f
34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90
8d 76
[ 32.807246] EAX: ffffffda EBX: 00000003 ECX: 0806233a EDX: 00000000
[ 32.813502] ESI: 085fb600 EDI: 085fb550 EBP: 085fb6e0 ESP: bffe839c
[ 32.819760] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000292
[ 32.826542] Modules linked in: test_printf(+) x86_pkg_temp_thermal fuse
[ 32.833150] CR2: 0000000000000000
[ 32.836461] ---[ end trace 69388c972b4562b8 ]---
[ 32.841072] EIP: ida_free+0x61/0x130
[ 32.844642] Code: 00 c7 45 e8 00 00 00 00 c7 45 ec 00 00 00 00 0f
88 c4 00 00 00 89 d3 e8 9d ee 01 00 89 c7 8d 45 d8 e8 e3 18 01 00 a8
01 75 3f <0f> a3 30 72 72 8b 45 d8 89 fa e8 70 f0 01 00 53 68 d8 61 01
d3 e8
[ 32.863420] EAX: 00000000 EBX: 00000000 ECX: ffffffff EDX: 00000000
[ 32.869679] ESI: 00000000 EDI: 00000246 EBP: f21a7cc8 ESP: f21a7c9c
[ 32.875936] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010046
[ 32.882713] CR0: 80050033 CR2: 00000000 CR3: 32ff3000 CR4: 003406d0
[ 32.888970] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 32.895227] DR6: fffe0ff0 DR7: 00000400
[ 32.899060] BUG: sleeping function called from invalid context at
/usr/src/kernel/include/linux/percpu-rwsem.h:49
[ 32.909303] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid:
387, name: modprobe
[ 32.917207] INFO: lockdep is turned off.
[ 32.921124] irq event stamp: 5120
[ 32.924434] hardirqs last enabled at (5119): [<d20dea05>] kfree+0x135/0x270
[ 32.931472] hardirqs last disabled at (5120): [<d2b9ab04>]
_raw_spin_lock_irqsave+0x14/0x40
[ 32.939809] softirqs last enabled at (4978): [<d2b9f165>]
__do_softirq+0x2c5/0x3c3
[ 32.947454] softirqs last disabled at (4969): [<d1ea67d5>]
call_on_stack+0x45/0x50
[ 32.955009] CPU: 0 PID: 387 Comm: modprobe Tainted: G D
5.6.0-rc4-next-20200305 #1
[ 32.963867] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 32.971250] Call Trace:
[ 32.973695] dump_stack+0x6e/0x96
[ 32.977009] ___might_sleep+0x14d/0x240
[ 32.980846] __might_sleep+0x33/0x80
[ 32.984419] exit_signals+0x2a/0x2d0
[ 32.987997] do_exit+0x8e/0xb00
[ 32.991143] ? do_fast_syscall_32+0x8e/0x340
[ 32.995421] rewind_stack_do_exit+0x11/0x13
[ 32.999600] EIP: 0xb7f75ce1
[ 33.002416] Code: 5e 5d c3 8d b6 00 00 00 00 b8 40 42 0f 00 eb c1
8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 51 52 55 89 e5 0f
34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90
8d 76
[ 33.021153] EAX: ffffffda EBX: 00000003 ECX: 0806233a EDX: 00000000
[ 33.027425] ESI: 085fb600 EDI: 085fb550 EBP: 085fb6e0 ESP: bffe839c
[ 33.033685] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000292
[ 33.040465] note: modprobe[387] exited with preempt_count 1
./../kselftest/module.sh: line 56: 387 Killed
$modprobe -q $module $args
printf: [FAIL]


metadata:
git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git branch: master
git describe: next-20200305
kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-core2-32/lkft/linux-next/719/config

ref:
https://lkft.validation.linaro.org/scheduler/job/1267112#L1254
https://lkft.validation.linaro.org/scheduler/job/1267041#L9795

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

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