linux-kernel - [Linux kernel bug] divide error in wq_update_node_max

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Message-ID: <CAEkJfYPGS1_4JqvpSo0=FM0S1ytB8CEbyreLTtWpR900dUZymw@mail.gmail.com>
Date: Tue, 23 Apr 2024 18:10:38 +0800
From: Sam Sun <samsun1006219@...il.com>
To: linux-kernel@...r.kernel.org, tj@...nel.org, jiangshanlai@...il.com
Cc: syzkaller-bugs@...glegroups.com, xrivendell7@...il.com
Subject: [Linux kernel bug] divide error in wq_update_node_max_active

Dear developers and maintainers,

We encountered a divide error bug while using our modified syzkaller.
It was tested against the latest upstream kernel (6.9-rc5). The kernel
was compiled by clang 14.0.0, and kernel config and C repro are
attached to this email. Kernel crash log is listed below.
```

divide error: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 21 Comm: cpuhp/1 Not tainted 6.9.0-rc5 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:wq_update_node_max_active+0x369/0x6b0 kernel/workqueue.c:1605
Code: 24 bf 00 00 00 80 44 89 fe e8 83 27 33 00 41 83 fc ff 75 0d 41
81 ff 00 00 00 80 0f 84 68 01 00 00 e8 fb 22 33 00 44 89 f8 99 <41> f7
fc 89 c5 89 c7 44 89 ee e8 a8 24 33 00 89 ef 8b 5c 24 04 89
RSP: 0018:ffffc9000018fbb0 EFLAGS: 00010293
RAX: 00000000000000ff RBX: 0000000000000001 RCX: ffff888100ada500
RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000080000000
RBP: 0000000000000001 R08: ffffffff815b1fcd R09: 1ffff1100364ad72
R10: dffffc0000000000 R11: ffffed100364ad73 R12: 0000000000000000
R13: 0000000000000100 R14: 0000000000000000 R15: 00000000000000ff
FS:  0000000000000000(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8c06ca6f8 CR3: 000000010d6c6000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 workqueue_offline_cpu+0x56f/0x600 kernel/workqueue.c:6525
 cpuhp_invoke_callback+0x4e1/0x870 kernel/cpu.c:194
 cpuhp_thread_fun+0x411/0x7d0 kernel/cpu.c:1092
 smpboot_thread_fn+0x544/0xa10 kernel/smpboot.c:164
 kthread+0x2ed/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:wq_update_node_max_active+0x369/0x6b0 kernel/workqueue.c:1605
Code: 24 bf 00 00 00 80 44 89 fe e8 83 27 33 00 41 83 fc ff 75 0d 41
81 ff 00 00 00 80 0f 84 68 01 00 00 e8 fb 22 33 00 44 89 f8 99 <41> f7
fc 89 c5 89 c7 44 89 ee e8 a8 24 33 00 89 ef 8b 5c 24 04 89
RSP: 0018:ffffc9000018fbb0 EFLAGS: 00010293
RAX: 00000000000000ff RBX: 0000000000000001 RCX: ffff888100ada500
RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000080000000
RBP: 0000000000000001 R08: ffffffff815b1fcd R09: 1ffff1100364ad72
R10: dffffc0000000000 R11: ffffed100364ad73 R12: 0000000000000000
R13: 0000000000000100 R14: 0000000000000000 R15: 00000000000000ff
FS:  0000000000000000(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8c06ca6f8 CR3: 000000010d6c6000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
----------------
Code disassembly (best guess):
   0: 24 bf                 and    $0xbf,%al
   2: 00 00                 add    %al,(%rax)
   4: 00 80 44 89 fe e8     add    %al,-0x170176bc(%rax)
   a: 83 27 33             andl   $0x33,(%rdi)
   d: 00 41 83             add    %al,-0x7d(%rcx)
  10: fc                   cld
  11: ff 75 0d             push   0xd(%rbp)
  14: 41 81 ff 00 00 00 80 cmp    $0x80000000,%r15d
  1b: 0f 84 68 01 00 00     je     0x189
  21: e8 fb 22 33 00       call   0x332321
  26: 44 89 f8             mov    %r15d,%eax
  29: 99                   cltd
* 2a: 41 f7 fc             idiv   %r12d <-- trapping instruction
  2d: 89 c5                 mov    %eax,%ebp
  2f: 89 c7                 mov    %eax,%edi
  31: 44 89 ee             mov    %r13d,%esi
  34: e8 a8 24 33 00       call   0x3324e1
  39: 89 ef                 mov    %ebp,%edi
  3b: 8b 5c 24 04           mov    0x4(%rsp),%ebx
  3f: 89                   .byte 0x89
```
If you have any questions, please contact us.

Reported by Yue Sun <samsun1006219@...il.com>
Reported by xingwei lee <xrivendell7@...il.com>

Best Regards,
Yue

Download attachment "config" of type "application/octet-stream" (247888 bytes)

View attachment "wq_update_node_max_active.c" of type "text/x-csrc" (2575 bytes)