BUG: unable to handle page fault for address: ffff887f9e4df0a0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 8526 Comm: syz.3.541 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vcs_scr_readw+0x75/0xd0 drivers/tty/vt/vt.c:4999
Code: 51 2b 5d fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 04 84 d2 75 40 <0f> b7 2b e8 23 2b 5d fc 5b 89 e8 5d c3 cc cc cc cc e8 15 2b 5d fc
RSP: 0018:ffffc9000c137bd8 EFLAGS: 00010246
RAX: 0000000000000001 RBX: ffff887f9e4df0a0 RCX: ffffffff855ddd35
RDX: 0000000000000000 RSI: ffffffff855ddd3f RDI: 0000000000000006
RBP: ffff8880258974ce R08: 0000000000000006 R09: ffff8880258974ce
R10: ffff887f9e4df0a0 R11: ffffffff82202dea R12: 0000000000000000
R13: ffff888035083006 R14: ffff887f9e4df0a0 R15: ffff887f9e4df0a2
FS: 00007fd1c43676c0(0000) GS:ffff8881246c3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff887f9e4df0a0 CR3: 000000001cee8000 CR4: 00000000003526f0
Call Trace:
<TASK>
vcs_read_buf drivers/tty/vt/vc_screen.c:352 [inline]
vcs_read+0x636/0xbe0 drivers/tty/vt/vc_screen.c:444
vfs_read+0x1e1/0xcf0 fs/read_write.c:570
ksys_pread64 fs/read_write.c:763 [inline]
__do_sys_pread64 fs/read_write.c:771 [inline]
__se_sys_pread64 fs/read_write.c:768 [inline]
__x64_sys_pread64+0x1eb/0x250 fs/read_write.c:768
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd1c358ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1c4367038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007fd1c37b5fa0 RCX: 00007fd1c358ebe9
RDX: 000000000000c721 RSI: 0000200000000040 RDI: 0000000000000006
RBP: 00007fd1c3611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1c37b6038 R14: 00007fd1c37b5fa0 R15: 00007ffc597f2638
</TASK>
Modules linked in:
CR2: ffff887f9e4df0a0
---[ end trace 0000000000000000 ]---
RIP: 0010:vcs_scr_readw+0x75/0xd0 drivers/tty/vt/vt.c:4999
Code: 51 2b 5d fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 04 84 d2 75 40 <0f> b7 2b e8 23 2b 5d fc 5b 89 e8 5d c3 cc cc cc cc e8 15 2b 5d fc
RSP: 0018:ffffc9000c137bd8 EFLAGS: 00010246
RAX: 0000000000000001 RBX: ffff887f9e4df0a0 RCX: ffffffff855ddd35
RDX: 0000000000000000 RSI: ffffffff855ddd3f RDI: 0000000000000006
RBP: ffff8880258974ce R08: 0000000000000006 R09: ffff8880258974ce
R10: ffff887f9e4df0a0 R11: ffffffff82202dea R12: 0000000000000000
R13: ffff888035083006 R14: ffff887f9e4df0a0 R15: ffff887f9e4df0a2
FS: 00007fd1c43676c0(0000) GS:ffff8881246c3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff887f9e4df0a0 CR3: 000000001cee8000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 51 push %rcx
1: 2b 5d fc sub -0x4(%rbp),%ebx
4: 48 89 da mov %rbx,%rdx
7: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
e: fc ff df
11: 48 c1 ea 03 shr $0x3,%rdx
15: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
19: 48 89 d8 mov %rbx,%rax
1c: 83 e0 07 and $0x7,%eax
1f: 83 c0 01 add $0x1,%eax
22: 38 d0 cmp %dl,%al
24: 7c 04 jl 0x2a
26: 84 d2 test %dl,%dl
28: 75 40 jne 0x6a
* 2a: 0f b7 2b movzwl (%rbx),%ebp <-- trapping instruction
2d: e8 23 2b 5d fc call 0xfc5d2b55
32: 5b pop %rbx
33: 89 e8 mov %ebp,%eax
35: 5d pop %rbp
36: c3 ret
37: cc int3
38: cc int3
39: cc int3
3a: cc int3
3b: e8 15 2b 5d fc call 0xfc5d2b55