[Bug 284073] bnxt: kernel panic on 14.2-RELEASE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284073

--- Comment #14 from Zhenlei Huang <[email protected]> ---
(In reply to Zhenlei Huang from comment #9)
Emm, I was wrong, RIP is next instruction. Stupid ...

```
% objdump --disassemble-symbols=sysctl_handle_string /boot/kernel/kernel 

/boot/kernel/kernel:    file format elf64-x86-64

Disassembly of section .text:

ffffffff80b4de20 <sysctl_handle_string>:
ffffffff80b4de20: 55                    pushq   %rbp
ffffffff80b4de21: 48 89 e5              movq    %rsp, %rbp
ffffffff80b4de24: 41 57                 pushq   %r15
ffffffff80b4de26: 41 56                 pushq   %r14
ffffffff80b4de28: 41 55                 pushq   %r13
ffffffff80b4de2a: 41 54                 pushq   %r12
ffffffff80b4de2c: 53                    pushq   %rbx
ffffffff80b4de2d: 50                    pushq   %rax
ffffffff80b4de2e: 48 89 cb              movq    %rcx, %rbx
ffffffff80b4de31: 49 89 f6              movq    %rsi, %r14
ffffffff80b4de34: 48 85 d2              testq   %rdx, %rdx
ffffffff80b4de37: 0f 84 9c 00 00 00     je      0xffffffff80b4ded9
<sysctl_handle_string+0xb9>
ffffffff80b4de3d: b8 00 00 08 40        movl    $0x40080000, %eax       # imm =
0x40080000
ffffffff80b4de42: 23 47 2c              andl    0x2c(%rdi), %eax
ffffffff80b4de45: 0f 84 8e 00 00 00     je      0xffffffff80b4ded9
<sysctl_handle_string+0xb9>
ffffffff80b4de4b: 80 3d 5f 22 cb 00 00  cmpb    $0x0, 0xcb225f(%rip)    #
0xffffffff818000b1 <kdb_active>
ffffffff80b4de52: 0f 85 81 00 00 00     jne     0xffffffff80b4ded9
<sysctl_handle_string+0xb9>
ffffffff80b4de58: 49 89 d7              movq    %rdx, %r15
ffffffff80b4de5b: 48 83 7b 10 00        cmpq    $0x0, 0x10(%rbx)
ffffffff80b4de60: 0f 84 a0 00 00 00     je      0xffffffff80b4df06
<sysctl_handle_string+0xe6>
ffffffff80b4de66: 4c 89 ff              movq    %r15, %rdi
ffffffff80b4de69: 48 c7 c6 c0 5c 8d 81  movq    $-0x7e72a340, %rsi      # imm =
0x818D5CC0
ffffffff80b4de70: ba 02 00 00 00        movl    $0x2, %edx
ffffffff80b4de75: e8 e6 51 fc ff        callq   0xffffffff80b13060 <malloc>
ffffffff80b4de7a: 49 89 c4              movq    %rax, %r12
ffffffff80b4de7d: 48 c7 c7 70 21 bb 81  movq    $-0x7e44de90, %rdi      # imm =
0x81BB2170
ffffffff80b4de84: 31 f6                 xorl    %esi, %esi
ffffffff80b4de86: e8 f5 bb ff ff        callq   0xffffffff80b49a80
<_sx_slock_int>
ffffffff80b4de8b: 4c 89 e7              movq    %r12, %rdi
ffffffff80b4de8e: 4c 89 f6              movq    %r14, %rsi
ffffffff80b4de91: 4c 89 fa              movq    %r15, %rdx
ffffffff80b4de94: e8 00 00 00 00        callq   0xffffffff80b4de99
<sysctl_handle_string+0x79>
ffffffff80b4de99: 48 c7 c7 70 21 bb 81  movq    $-0x7e44de90, %rdi      # imm =
0x81BB2170
ffffffff80b4dea0: e8 db c2 ff ff        callq   0xffffffff80b4a180
<_sx_sunlock_int>
ffffffff80b4dea5: 4c 89 e7              movq    %r12, %rdi
ffffffff80b4dea8: e8 d3 3c 4d 00        callq   0xffffffff81021b80 <strlen>
ffffffff80b4dead: 48 8d 50 01           leaq    0x1(%rax), %rdx
ffffffff80b4deb1: 48 89 df              movq    %rbx, %rdi
ffffffff80b4deb4: 4c 89 e6              movq    %r12, %rsi
ffffffff80b4deb7: ff 53 28              callq   *0x28(%rbx)
ffffffff80b4deba: 41 89 c5              movl    %eax, %r13d
ffffffff80b4debd: 4c 89 e7              movq    %r12, %rdi
ffffffff80b4dec0: 48 c7 c6 c0 5c 8d 81  movq    $-0x7e72a340, %rsi      # imm =
0x818D5CC0
ffffffff80b4dec7: e8 34 50 fc ff        callq   0xffffffff80b12f00 <free>
ffffffff80b4decc: 44 89 e8              movl    %r13d, %eax
ffffffff80b4decf: 85 c0                 testl   %eax, %eax
ffffffff80b4ded1: 0f 85 de 00 00 00     jne     0xffffffff80b4dfb5
<sysctl_handle_string+0x195>
ffffffff80b4ded7: eb 64                 jmp     0xffffffff80b4df3d
<sysctl_handle_string+0x11d>
ffffffff80b4ded9: 4c 89 f7              movq    %r14, %rdi
ffffffff80b4dedc: e8 9f 3c 4d 00        callq   0xffffffff81021b80 <strlen>
ffffffff80b4dee1: 49 89 c7              movq    %rax, %r15
ffffffff80b4dee4: 49 ff c7              incq    %r15
ffffffff80b4dee7: 4c 8b 63 10           movq    0x10(%rbx), %r12
ffffffff80b4deeb: 4c 89 f7              movq    %r14, %rdi
ffffffff80b4deee: e8 8d 3c 4d 00        callq   0xffffffff81021b80 <strlen>
ffffffff80b4def3: 48 89 c2              movq    %rax, %rdx
ffffffff80b4def6: 4d 85 e4              testq   %r12, %r12
ffffffff80b4def9: 74 33                 je      0xffffffff80b4df2e
<sysctl_handle_string+0x10e>
ffffffff80b4defb: 48 ff c2              incq    %rdx
ffffffff80b4defe: 48 89 df              movq    %rbx, %rdi
...
```

The current instruction should be `0xffffffff80b4dee4`.

```
% addr2line -fip -e kernel.debug 0xffffffff80b4dee4
sysctl_handle_string at /usr/src/sys/kern/kern_sysctl.c:1783
```

https://cgit.freebsd.org/src/tree/sys/kern/kern_sysctl.c?h=releng/14.2#n1783

Then that makes sense.

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