BUG: unable to handle page fault for address: ffffc90018610fe8
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 13fe10067 P4D 13fe10067 PUD 1e2b7067 PMD 28cdb067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 12627 Comm: syz.3.4799 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:write_comp_data+0x7c/0xa0 kernel/kcov.c:263
Code: 00 8b bf 1c 17 00 00 48 8b 30 48 c1 e7 03 4c 8d 1c b5 00 00 00 00 4a 8d 14 dd 28 00 00 00 48 39 d7 72 1b 48 83 c6 01 48 89 30 <4c> 89 44 10 e0 4c 89 4c 10 e8 4c 89 54 10 f0 4a 89 4c d8 20 c3 cc
RSP: 0018:ffffc90004557e80 EFLAGS: 00050257
RAX: ffffc90018611000 RBX: 0000000000000000 RCX: ffffffff824a5f35
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000400000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000001 R11: fffffffffffffffc R12: 0000000000000020
R13: 0000000000000000 R14: 00007ffffffff000 R15: 0000000000000001
FS:  00007fa71b8716c0(0000) GS:ffff88812294a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90018610fe8 CR3: 0000000068b80000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rseq_register+0x115/0x350 kernel/rseq.c:460
 __do_sys_rseq kernel/rseq.c:561 [inline]
 __se_sys_rseq kernel/rseq.c:547 [inline]
 __x64_sys_rseq+0x1b8/0x2e0 kernel/rseq.c:547
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa71a99e2d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa71b871028 EFLAGS: 00000246 ORIG_RAX: 000000000000014e
RAX: ffffffffffffffda RBX: 00007fa71ac26450 RCX: 00007fa71a99e2d9
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000000
RBP: 00007fa71aa35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008000006 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa71ac264e8 R14: 00007fa71ac26450 R15: 00007fff8bca35a8
 </TASK>
Modules linked in:
CR2: ffffc90018610fe8
---[ end trace 0000000000000000 ]---
RIP: 0010:write_comp_data+0x7c/0xa0 kernel/kcov.c:263
Code: 00 8b bf 1c 17 00 00 48 8b 30 48 c1 e7 03 4c 8d 1c b5 00 00 00 00 4a 8d 14 dd 28 00 00 00 48 39 d7 72 1b 48 83 c6 01 48 89 30 <4c> 89 44 10 e0 4c 89 4c 10 e8 4c 89 54 10 f0 4a 89 4c d8 20 c3 cc
RSP: 0018:ffffc90004557e80 EFLAGS: 00050257
RAX: ffffc90018611000 RBX: 0000000000000000 RCX: ffffffff824a5f35
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000400000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000001 R11: fffffffffffffffc R12: 0000000000000020
R13: 0000000000000000 R14: 00007ffffffff000 R15: 0000000000000001
FS:  00007fa71b8716c0(0000) GS:ffff88812294a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90018610fe8 CR3: 0000000068b80000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	00 8b bf 1c 17 00    	add    %cl,0x171cbf(%rbx)
   6:	00 48 8b             	add    %cl,-0x75(%rax)
   9:	30 48 c1             	xor    %cl,-0x3f(%rax)
   c:	e7 03                	out    %eax,$0x3
   e:	4c 8d 1c b5 00 00 00 	lea    0x0(,%rsi,4),%r11
  15:	00
  16:	4a 8d 14 dd 28 00 00 	lea    0x28(,%r11,8),%rdx
  1d:	00
  1e:	48 39 d7             	cmp    %rdx,%rdi
  21:	72 1b                	jb     0x3e
  23:	48 83 c6 01          	add    $0x1,%rsi
  27:	48 89 30             	mov    %rsi,(%rax)
* 2a:	4c 89 44 10 e0       	mov    %r8,-0x20(%rax,%rdx,1) <-- trapping instruction
  2f:	4c 89 4c 10 e8       	mov    %r9,-0x18(%rax,%rdx,1)
  34:	4c 89 54 10 f0       	mov    %r10,-0x10(%rax,%rdx,1)
  39:	4a 89 4c d8 20       	mov    %rcx,0x20(%rax,%r11,8)
  3e:	c3                   	ret
  3f:	cc                   	int3