syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 6035 Comm: kworker/0:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue:  do_submit_urb (events)
RIP: 0010:process_one_work kernel/workqueue.c:2575 [inline]
RIP: 0010:process_scheduled_works+0x5aa/0x15b0 kernel/workqueue.c:2711
Code: 89 ac 24 10 01 00 00 44 89 e8 c1 e8 05 83 e0 0f 89 03 48 8b 44 24 38 48 8d 58 08 48 89 d8 48 c1 e8 03 48 89 84 24 80 00 00 00 <42> 80 3c 20 00 74 08 48 89 df e8 a7 25 85 00 48 89 5c 24 48 4c 8b
RSP: 0018:ffffc900036a7bc0 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000001fffffffc0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffffc900036a7da8 R08: ffffffff970c430b R09: 1ffffffff2e18861
R10: dffffc0000000000 R11: fffffbfff2e18862 R12: dffffc0000000000
R13: 0000001fffffffc0 R14: ffff8880219087b0 R15: ffff888024235518
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0084a7000 CR3: 000000007b556000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:process_one_work kernel/workqueue.c:2575 [inline]
RIP: 0010:process_scheduled_works+0x5aa/0x15b0 kernel/workqueue.c:2711
Code: 89 ac 24 10 01 00 00 44 89 e8 c1 e8 05 83 e0 0f 89 03 48 8b 44 24 38 48 8d 58 08 48 89 d8 48 c1 e8 03 48 89 84 24 80 00 00 00 <42> 80 3c 20 00 74 08 48 89 df e8 a7 25 85 00 48 89 5c 24 48 4c 8b
RSP: 0018:ffffc900036a7bc0 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000001fffffffc0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffffc900036a7da8 R08: ffffffff970c430b R09: 1ffffffff2e18861
R10: dffffc0000000000 R11: fffffbfff2e18862 R12: dffffc0000000000
R13: 0000001fffffffc0 R14: ffff8880219087b0 R15: ffff888024235518
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0084a7000 CR3: 000000007b556000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	89 ac 24 10 01 00 00 	mov    %ebp,0x110(%rsp)
   7:	44 89 e8             	mov    %r13d,%eax
   a:	c1 e8 05             	shr    $0x5,%eax
   d:	83 e0 0f             	and    $0xf,%eax
  10:	89 03                	mov    %eax,(%rbx)
  12:	48 8b 44 24 38       	mov    0x38(%rsp),%rax
  17:	48 8d 58 08          	lea    0x8(%rax),%rbx
  1b:	48 89 d8             	mov    %rbx,%rax
  1e:	48 c1 e8 03          	shr    $0x3,%rax
  22:	48 89 84 24 80 00 00 	mov    %rax,0x80(%rsp)
  29:	00
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 a7 25 85 00       	call   0x8525e0
  39:	48 89 5c 24 48       	mov    %rbx,0x48(%rsp)
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b