BUG: unable to handle page fault for address: ffffdc0000000013
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 11826067 P4D 11826067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 55 Comm: kworker/u4:4 Not tainted 6.0.0-rc1-next-20220816-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_unbound call_usermodehelper_exec_work
RIP: 0010:copy_namespaces+0xe8/0x480 kernel/nsproxy.c:154
Code: ee 6a 2b 00 45 85 ed 0f 84 d4 01 00 00 e8 20 6e 2b 00 49 8d bf 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 42 03 00 00 4d 8b bf 98 00 00 00 e8 82 b9 15 00
RSP: 0000:ffffc90001567900 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff8880201e0000 RCX: 0000000000000000
RDX: 1fffe00000000013 RSI: ffffffff8150a700 RDI: ffff000000000098
RBP: ffff000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000808100
R13: 0000000000000001 R14: ffff8880201e08a0 R15: ffff000000000000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000013 CR3: 000000000bc8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
copy_process+0x308a/0x7120 kernel/fork.c:2260
kernel_clone+0xe7/0xab0 kernel/fork.c:2675
user_mode_thread+0xad/0xe0 kernel/fork.c:2744
call_usermodehelper_exec_work kernel/umh.c:174 [inline]
call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:160
process_one_work+0x991/0x1610 kernel/workqueue.c:2312
worker_thread+0x665/0x1080 kernel/workqueue.c:2459
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Modules linked in:
CR2: ffffdc0000000013
---[ end trace 0000000000000000 ]---
RIP: 0010:copy_namespaces+0xe8/0x480 kernel/nsproxy.c:154
Code: ee 6a 2b 00 45 85 ed 0f 84 d4 01 00 00 e8 20 6e 2b 00 49 8d bf 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 42 03 00 00 4d 8b bf 98 00 00 00 e8 82 b9 15 00
RSP: 0000:ffffc90001567900 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff8880201e0000 RCX: 0000000000000000
RDX: 1fffe00000000013 RSI: ffffffff8150a700 RDI: ffff000000000098
RBP: ffff000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000808100
R13: 0000000000000001 R14: ffff8880201e08a0 R15: ffff000000000000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000013 CR3: 000000000bc8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: ee out %al,(%dx)
1: 6a 2b pushq $0x2b
3: 00 45 85 add %al,-0x7b(%rbp)
6: ed in (%dx),%eax
7: 0f 84 d4 01 00 00 je 0x1e1
d: e8 20 6e 2b 00 callq 0x2b6e32
12: 49 8d bf 98 00 00 00 lea 0x98(%r15),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 42 03 00 00 jne 0x376
34: 4d 8b bf 98 00 00 00 mov 0x98(%r15),%r15
3b: e8 82 b9 15 00 callq 0x15b9c2