BUG: unable to handle page fault for address: ffffc9001a61ffe8
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 13fe40067 P4D 13fe40067 PUD 1cae7067 PMD 2be9e067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5067 Comm: syz.1.4171 Tainted: G U L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:write_comp_data+0x75/0x90 kernel/kcov.c:267
Code: 00 8b bf fc 16 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 bd 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:ffffc900067ffe78 EFLAGS: 00050257
RAX: ffffc9001a620000 RBX: 0000000000000000 RCX: ffffffff82458af5
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: 00007f759b23e6c0(0000) GS:ffff888123ddf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9001a61ffe8 CR3: 000000005a850000 CR4: 00000000003526f0
Call Trace:
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:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f759a39e019
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[ 1868.785525][ T5067] RSP: 002b:00007f759b23e028 EFLAGS: 00000246 ORIG_RAX: 000000000000014e
RAX: ffffffffffffffda RBX: 00007f759a626450 RCX: 00007f759a39e019
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000000
RBP: 00007f759a43500c R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000000
R13: 00007f759a6264e8 R14: 00007f759a626450 R15: 00007ffd42e29108
Modules linked in:
CR2: ffffc9001a61ffe8
---[ end trace 0000000000000000 ]---
RIP: 0010:write_comp_data+0x75/0x90 kernel/kcov.c:267
Code: 00 8b bf fc 16 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 bd 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:ffffc900067ffe78 EFLAGS: 00050257
RAX: ffffc9001a620000 RBX: 0000000000000000 RCX: ffffffff82458af5
BUG: unable to handle page fault for address: ffffc9001a61ffe8
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 13fe40067 P4D 13fe40067 PUD 1cae7067 PMD 2be9e067 PTE 0
Oops: Oops: 0002 [#2] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5067 Comm: syz.1.4171 Tainted: G UD L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [D]=DIE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:write_comp_data+0x75/0x90 kernel/kcov.c:267
Code: 00 8b bf fc 16 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 bd 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:ffffc900067ff608 EFLAGS: 00010057
RAX: ffffc9001a620000 RBX: 0000000000000000 RCX: ffffffff85a0c3a3
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000400000
RBP: ffffffff9b9f74a0 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000020 R11: fffffffffffffffc R12: 0000000000000809
R13: 0000000000000020 R14: fffffbfff373eeee R15: dffffc0000000000
FS: 00007f759b23e6c0(0000) GS:ffff888123ddf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9001a61ffe8 CR3: 000000005a850000 CR4: 00000000003526f0
Call Trace:
wait_for_lsr+0x183/0x210 drivers/tty/serial/8250/8250_port.c:1984
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3235 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3300 [inline]
serial8250_console_write+0xdfd/0x1a50 drivers/tty/serial/8250/8250_port.c:3385
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__show_regs.cold+0x93/0x554 arch/x86/kernel/process_64.c:85
oops_end+0x7d/0xe0 arch/x86/kernel/dumpstack.c:391
page_fault_oops+0x312/0x820 arch/x86/mm/fault.c:724
kernelmode_fixup_or_oops.isra.0+0xbd/0xf0 arch/x86/mm/fault.c:745
__bad_area_nosemaphore+0x35b/0x3f0 arch/x86/mm/fault.c:792
do_kern_addr_fault+0x5b/0x80 arch/x86/mm/fault.c:1203
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0xc3/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:write_comp_data+0x75/0x90 kernel/kcov.c:267
Code: 00 8b bf fc 16 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 bd 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:ffffc900067ffe78 EFLAGS: 00050257
RAX: ffffc9001a620000 RBX: 0000000000000000 RCX: ffffffff82458af5
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000400000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000001 R11: fffffffffffffffc R12: 0000000000000020
R13: 0000000000000000 R14: 00007ffffffff000 R15: 0000000000000001
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:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f759a39e019
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:00007f759b23e028 EFLAGS: 00000246 ORIG_RAX: 000000000000014e
RAX: ffffffffffffffda RBX: 00007f759a626450 RCX: 00007f759a39e019
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000000
RBP: 00007f759a43500c R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000000
R13: 00007f759a6264e8 R14: 00007f759a626450 R15: 00007ffd42e29108
Modules linked in:
CR2: ffffc9001a61ffe8
---[ end trace 0000000000000000 ]---
RIP: 0010:write_comp_data+0x75/0x90 kernel/kcov.c:267
Code: 00 8b bf fc 16 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 bd 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:ffffc900067ffe78 EFLAGS: 00050257
RAX: ffffc9001a620000 RBX: 0000000000000000 RCX: ffffffff82458af5
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: 00007f759b23e6c0(0000) GS:ffff888123ddf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9001a61ffe8 CR3: 000000005a850000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 00 8b bf fc 16 00 add %cl,0x16fcbf(%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 bd jb 0xffffffe0
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