[Bug gcov-profile/94394] New: [GCOV]It will cause random kernel panic during collecting kernel code coverage

[ammy.yi at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94394

            Bug ID: 94394
           Summary: [GCOV]It will cause random kernel panic during
                    collecting kernel code coverage
           Product: gcc
           Version: 9.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ammy.yi at intel dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

It will cause random kernel panic during collecting kernel code coverage .

gcc version 9.3.1 20200319 releases

[  222.538244] #PF: supervisor instruction fetch in kernel mode
[  222.543945] #PF: error_code(0x0010) - not-present page
[  222.549133] PGD 0 P4D 0 
[  222.551719] Oops: 0010 [#1] SMP NOPTI
[  222.577223] RIP: 0010:0x0
[  222.579901] Code: Bad RIP value.
[  222.583184] RSP: 0018:ffffae3140f13f58 EFLAGS: 00010082
[  222.588448] RAX: ffffffff94217940 RBX: 0000000000000000 RCX:
0000000000000000
[  222.595618] RDX: 0000000080004000 RSI: ffff89203c624440 RDI:
ffffffff94217940
[  222.602781] RBP: 0000000000000000 R08: ffffffff94203da0 R09:
0000000000000000
[  222.609942] R10: 0000000000000000 R11: 000000000002c502 R12:
0000000000000000
[  222.617114] R13: 0000000000000000 R14: 0000000000000000 R15:
0000000000000000
[  222.624283] FS:  00007fc8e2c1a740(0000) GS:ffff89205fc00000(0000)
knlGS:0000000000000000
[  222.632404] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  222.638190] CR2: ffffffffffffffd6 CR3: 0000000497278005 CR4:
0000000000fe0ef0
[  222.645354] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  222.652523] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  222.659697] PKRU: 55555554
[  222.662441] Call Trace:
[  222.664924] WARNING: kernel stack frame pointer at 00000000fc81ab36 in
load_unload_mod:4080 has bad value 000000008657b9bc
[  222.664926] unwind stack type:0 next_sp:000000008657b9bc mask:0x2
graph_idx:0
[  222.664927] 00000000fc81ab36: 0000000000000000 ...