[axboe-block:rw_iter] [fs/proc] 611088cbf6: segfault_at_ip_sp_error

[kernel test robot]

Hello,

kernel test robot noticed "segfault_at_ip_sp_error" on:

commit: 611088cbf6bda5c9218c735809215f2b6f6ca8a9 ("fs/proc: convert to read/write iterators")
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git rw_iter

in testcase: boot

compiler: gcc-13
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+--------------------------------------------------------------+------------+------------+
|                                                              | 255806aeec | 611088cbf6 |
+--------------------------------------------------------------+------------+------------+
| segfault_at_ip_sp_error                                      | 0          | 20         |
+--------------------------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202404221436.c921df08-oliver.sang@xxxxxxxxx



[  809.068720][  T602] vmstat[602]: segfault at 50b000 ip b7f2f6ec sp bfef7790 error 6 in libprocps.so.7.1.0[b7f2f000+a000] likely on CPU 0 (core 0, socket 0)
[ 809.071867][ T602] Code: 84 91 00 00 00 89 74 24 0c 89 ee 89 cd 90 57 6a 01 6a 08 55 e8 e5 fb ff ff 8b 83 f0 09 00 00 8b 54 24 24 8b 4c 24 28 83 c4 10 <89> 14 30 89 4c 30 04 8b 44 24 14 83 c6 08 85 c0 75 d2 8b 74 24 0c
All code
========
   0:	84 91 00 00 00 89    	test   %dl,-0x77000000(%rcx)
   6:	74 24                	je     0x2c
   8:	0c 89                	or     $0x89,%al
   a:	ee                   	out    %al,(%dx)
   b:	89 cd                	mov    %ecx,%ebp
   d:	90                   	nop
   e:	57                   	push   %rdi
   f:	6a 01                	pushq  $0x1
  11:	6a 08                	pushq  $0x8
  13:	55                   	push   %rbp
  14:	e8 e5 fb ff ff       	callq  0xfffffffffffffbfe
  19:	8b 83 f0 09 00 00    	mov    0x9f0(%rbx),%eax
  1f:	8b 54 24 24          	mov    0x24(%rsp),%edx
  23:	8b 4c 24 28          	mov    0x28(%rsp),%ecx
  27:	83 c4 10             	add    $0x10,%esp
  2a:*	89 14 30             	mov    %edx,(%rax,%rsi,1)		<-- trapping instruction
  2d:	89 4c 30 04          	mov    %ecx,0x4(%rax,%rsi,1)
  31:	8b 44 24 14          	mov    0x14(%rsp),%eax
  35:	83 c6 08             	add    $0x8,%esi
  38:	85 c0                	test   %eax,%eax
  3a:	75 d2                	jne    0xe
  3c:	8b 74 24 0c          	mov    0xc(%rsp),%esi

Code starting with the faulting instruction
===========================================
   0:	89 14 30             	mov    %edx,(%rax,%rsi,1)
   3:	89 4c 30 04          	mov    %ecx,0x4(%rax,%rsi,1)
   7:	8b 44 24 14          	mov    0x14(%rsp),%eax
   b:	83 c6 08             	add    $0x8,%esi
   e:	85 c0                	test   %eax,%eax
  10:	75 d2                	jne    0xffffffffffffffe4
  12:	8b 74 24 0c          	mov    0xc(%rsp),%esi
[  809.127897][  T543] vmstat[543]: segfault at 4df000 ip b7f926ec sp bfe31560 error 6 in libprocps.so.7.1.0[b7f92000+a000] likely on CPU 0 (core 0, socket 0)
[ 809.131027][ T543] Code: 84 91 00 00 00 89 74 24 0c 89 ee 89 cd 90 57 6a 01 6a 08 55 e8 e5 fb ff ff 8b 83 f0 09 00 00 8b 54 24 24 8b 4c 24 28 83 c4 10 <89> 14 30 89 4c 30 04 8b 44 24 14 83 c6 08 85 c0 75 d2 8b 74 24 0c
All code
========
   0:	84 91 00 00 00 89    	test   %dl,-0x77000000(%rcx)
   6:	74 24                	je     0x2c
   8:	0c 89                	or     $0x89,%al
   a:	ee                   	out    %al,(%dx)
   b:	89 cd                	mov    %ecx,%ebp
   d:	90                   	nop
   e:	57                   	push   %rdi
   f:	6a 01                	pushq  $0x1
  11:	6a 08                	pushq  $0x8
  13:	55                   	push   %rbp
  14:	e8 e5 fb ff ff       	callq  0xfffffffffffffbfe
  19:	8b 83 f0 09 00 00    	mov    0x9f0(%rbx),%eax
  1f:	8b 54 24 24          	mov    0x24(%rsp),%edx
  23:	8b 4c 24 28          	mov    0x28(%rsp),%ecx
  27:	83 c4 10             	add    $0x10,%esp
  2a:*	89 14 30             	mov    %edx,(%rax,%rsi,1)		<-- trapping instruction
  2d:	89 4c 30 04          	mov    %ecx,0x4(%rax,%rsi,1)
  31:	8b 44 24 14          	mov    0x14(%rsp),%eax
  35:	83 c6 08             	add    $0x8,%esi
  38:	85 c0                	test   %eax,%eax
  3a:	75 d2                	jne    0xe
  3c:	8b 74 24 0c          	mov    0xc(%rsp),%esi

Code starting with the faulting instruction
===========================================
   0:	89 14 30             	mov    %edx,(%rax,%rsi,1)
   3:	89 4c 30 04          	mov    %ecx,0x4(%rax,%rsi,1)
   7:	8b 44 24 14          	mov    0x14(%rsp),%eax
   b:	83 c6 08             	add    $0x8,%esi
   e:	85 c0                	test   %eax,%eax
  10:	75 d2                	jne    0xffffffffffffffe4
  12:	8b 74 24 0c          	mov    0xc(%rsp),%esi


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240422/202404221436.c921df08-oliver.sang@xxxxxxxxx



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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki