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Subject[v5.3-rc1 regression] Hitting a kernel BUG() when trying to load a module on DaVinci SoC
Hi,

with v5.3-rc1 I'm hitting the following BUG() when trying to load the
gpio-backlight module:

kernel BUG at kernel/module.c:1919!
Internal error: Oops - BUG: 0 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: systemd Tainted: G W
5.2.0-rc2-00005-g7dabaa5ce05a #19
Hardware name: DaVinci DA850/OMAP-L138/AM18x EVM
PC is at frob_text.constprop.16+0x2c/0x34
LR is at load_module+0x1888/0x21b4
pc : [<c0081bbc>] lr : [<c0083c4c>] psr: 20000013
sp : c6837e58 ip : c6b4fa80 fp : bf00574c
r10: c0601008 r9 : bf005740 r8 : c0493e38
r7 : c00807f8 r6 : 00000000 r5 : 00000001 r4 : c6837f38
r3 : 00000fff r2 : bf000000 r1 : 00004b80 r0 : bf005818
Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
Control: 0005317f Table: c6b78000 DAC: 00000051
Process systemd (pid: 1, stack limit = 0x(ptrval))
Stack: (0xc6837e58 to 0xc6838000)
7e40: bf005740 c6492a90
7e60: 00000001 c6bf5788 00000003 c6837f38 bf0058c0 bf0058a8 bf00a495 c0493e38
7e80: 00000000 c05368c0 00000001 00000000 c0580030 c0574b28 00000000 00000000
7ea0: 00000000 00000000 00000000 00000000 6e72656b 00006c65 00000000 00000000
7ec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
7ee0: 00000000 00000000 00000000 aefb2bb8 7fffffff c0601008 00000000 00000004
7f00: b6cee714 c00091e4 c6836000 00000000 005bc668 c00847b0 7fffffff 00000000
7f20: 00000003 00000000 0000b2d0 c884e000 0000b2d0 00000000 c8852dcb c88533a0
7f40: c884e000 0000b2d0 c8858cb8 c8858b34 c88568d4 000058c0 00006190 000023b8
7f60: 00006713 00000000 00000000 00000000 000023a8 00000024 00000025 00000019
7f80: 0000001d 00000011 00000000 aefb2bb8 00000000 00000000 00000000 00000000
7fa0: 0000017b c0009000 00000000 00000000 00000004 b6cee714 00000000 00000000
7fc0: 00000000 00000000 00000000 0000017b 00000000 00000000 00000001 005bc668
7fe0: be907b00 be907af0 b6ce66b0 b6c3fac0 60000010 00000004 00000000 00000000
[<c0081bbc>] (frob_text.constprop.16) from [<c0083c4c>]
(load_module+0x1888/0x21b4)
[<c0083c4c>] (load_module) from [<c00847b0>] (sys_finit_module+0xbc/0xdc)
[<c00847b0>] (sys_finit_module) from [<c0009000>] (ret_fast_syscall+0x0/0x50)
Exception stack(0xc6837fa8 to 0xc6837ff0)
7fa0: 00000000 00000000 00000004 b6cee714 00000000 00000000
7fc0: 00000000 00000000 00000000 0000017b 00000000 00000000 00000001 005bc668
7fe0: be907b00 be907af0 b6ce66b0 b6c3fac0
Code: e1a01621 e1a00002 eafe4531 e7f001f2 (e7f001f2)
---[ end trace 2cbefb0005882c52 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
---[ end Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b ]---

I bisected it to commit 06bd260e836d ("modules: fix BUG when load
module with rodata=n") with commit 7dabaa5ce05a ("modules: fix compile
error if don't have strict module rwx") on top to make it build.

Let me know if you need me to provide more info.

Best regards,
Bartosz Golaszewski

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