general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7]
CPU: 1 PID: 18 Comm: cpuhp/1 Tainted: G S                syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:io_wq_for_each_worker io_uring/io-wq.c:860 [inline]
RIP: 0010:__io_wq_cpu_online+0x173/0x430 io_uring/io-wq.c:1326
Code: 8d 1c c1 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 ff ff d8 fd 4c 8b 23 b8 a0 00 00 00 49 01 c4 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 df ff d8 fd 4d 8b 2c 24 4d 39 e5 0f
RSP: 0018:ffffc90000d87c78 EFLAGS: 00010206
RAX: 0000000000000014 RBX: ffff8880730449a0 RCX: ffff888073044998
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: dffffc0000000000 R09: 1ffffffff203dc18
R10: dffffc0000000000 R11: fffffbfff203dc19 R12: 00000000000000a0
R13: ffff88807db668a0 R14: 0000000000000002 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c4 CR3: 000000000c08e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 io_wq_cpu_offline+0x20/0x30 io_uring/io-wq.c:1342
 cpuhp_invoke_callback+0x321/0x7e0 kernel/cpu.c:213
 cpuhp_thread_fun+0x3b2/0x7f0 kernel/cpu.c:822
 smpboot_thread_fn+0x520/0x990 kernel/smpboot.c:164
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace db3525175b27f312 ]---
RIP: 0010:io_wq_for_each_worker io_uring/io-wq.c:860 [inline]
RIP: 0010:__io_wq_cpu_online+0x173/0x430 io_uring/io-wq.c:1326
Code: 8d 1c c1 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 ff ff d8 fd 4c 8b 23 b8 a0 00 00 00 49 01 c4 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 df ff d8 fd 4d 8b 2c 24 4d 39 e5 0f
RSP: 0018:ffffc90000d87c78 EFLAGS: 00010206
RAX: 0000000000000014 RBX: ffff8880730449a0 RCX: ffff888073044998
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: dffffc0000000000 R09: 1ffffffff203dc18
R10: dffffc0000000000 R11: fffffbfff203dc19 R12: 00000000000000a0
R13: ffff88807db668a0 R14: 0000000000000002 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c4 CR3: 000000000c08e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 1c c1             	lea    (%rcx,%rax,8),%ebx
   3:	48 89 d8             	mov    %rbx,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
   e:	74 08                	je     0x18
  10:	48 89 df             	mov    %rbx,%rdi
  13:	e8 ff ff d8 fd       	call   0xfdd90017
  18:	4c 8b 23             	mov    (%rbx),%r12
  1b:	b8 a0 00 00 00       	mov    $0xa0,%eax
  20:	49 01 c4             	add    %rax,%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 e7             	mov    %r12,%rdi
  33:	e8 df ff d8 fd       	call   0xfdd90017
  38:	4d 8b 2c 24          	mov    (%r12),%r13
  3c:	4d 39 e5             	cmp    %r12,%r13
  3f:	0f                   	.byte 0xf