Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 48c6615cc557593e4190415a6945b7aca7c8db31 ("xfs: grab active perag ref when reading AG headers")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master


in testcase: xfstests
version: xfstests-x86_64-76d2a91-1_20210818
with following parameters:

	disk: 4HDD
	fs: xfs
	test: xfs-group-35
	ucode: 0x21

test-description: xfstests is a regression test suite for xfs and other files ystems.
test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git


on test machine: 4 threads 1 sockets Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 8G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):



If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@intel.com>


[  221.758881][   T14] 00000030: 00 00 00 0b 25 ab 19 f4 00 80 04 13 00 80 04 14  ....%...........
[  221.759029][   T14] 00000040: 00 80 04 15 00 80 04 16 00 80 04 17 ff ff ff ff  ................
[  221.759186][   T14] 00000050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[  221.759335][   T14] 00000060: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[  221.759483][   T14] 00000070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[  221.759654][ T1415] XFS: Assertion failed: !sa->pag, file: fs/xfs/scrub/common.c, line: 412
[  221.759805][ T1415] ------------[ cut here ]------------
[  221.759892][ T1415] kernel BUG at fs/xfs/xfs_message.c:110!
[  221.759992][ T1415] invalid opcode: 0000 [#1] SMP PTI
[  221.760078][ T1415] CPU: 2 PID: 1415 Comm: xfs_scrub Not tainted 5.14.0-rc4-00021-g48c6615cc557 #1
[  221.760228][ T1415] Hardware name: Hewlett-Packard p6-1451cx/2ADA, BIOS 8.15 02/05/2013
[ 221.760357][ T1415] RIP: 0010:assfail (kbuild/src/consumer/fs/xfs/./xfs_trace.h:212 (discriminator 8)) xfs
[ 221.760516][ T1415] Code: 67 fc ff ff 0f 0b c3 0f 1f 44 00 00 41 89 c8 48 89 d1 48 89 f2 48 c7 c6 98 5c 9f c0 e8 82 f9 ff ff 80 3d dd e1 0a 00 00 74 02 <0f> 0b 0f 0b c3 48 8d 45 10 48 89 e2 4c 89 e6 48 89 1c 24 48 89 44
All code
========
   0:	67 fc                	addr32 cld 
   2:	ff                   	(bad)  
   3:	ff 0f                	decl   (%rdi)
   5:	0b c3                	or     %ebx,%eax
   7:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   c:	41 89 c8             	mov    %ecx,%r8d
   f:	48 89 d1             	mov    %rdx,%rcx
  12:	48 89 f2             	mov    %rsi,%rdx
  15:	48 c7 c6 98 5c 9f c0 	mov    $0xffffffffc09f5c98,%rsi
  1c:	e8 82 f9 ff ff       	callq  0xfffffffffffff9a3
  21:	80 3d dd e1 0a 00 00 	cmpb   $0x0,0xae1dd(%rip)        # 0xae205
  28:	74 02                	je     0x2c
  2a:*	0f 0b                	ud2    		<-- trapping instruction
  2c:	0f 0b                	ud2    
  2e:	c3                   	retq   
  2f:	48 8d 45 10          	lea    0x10(%rbp),%rax
  33:	48 89 e2             	mov    %rsp,%rdx
  36:	4c 89 e6             	mov    %r12,%rsi
  39:	48 89 1c 24          	mov    %rbx,(%rsp)
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2    
   2:	0f 0b                	ud2    
   4:	c3                   	retq   
   5:	48 8d 45 10          	lea    0x10(%rbp),%rax
   9:	48 89 e2             	mov    %rsp,%rdx
   c:	4c 89 e6             	mov    %r12,%rsi
   f:	48 89 1c 24          	mov    %rbx,(%rsp)
  13:	48                   	rex.W
  14:	89                   	.byte 0x89
  15:	44                   	rex.R
[  221.760821][ T1415] RSP: 0018:ffffc9000aacb890 EFLAGS: 00010202
[  221.760974][ T1415] RAX: 0000000000000000 RBX: ffffc9000aacbcc8 RCX: 0000000000000000
[  221.761103][ T1415] RDX: 00000000ffffffc0 RSI: 000000000000000a RDI: ffffffffc09e7dcd
[  221.761237][ T1415] RBP: ffffc9000aacbc80 R08: ffff8881fdf17d50 R09: 0000000000000000
[  221.761371][ T1415] R10: 000000000000000a R11: f000000000000000 R12: 0000000000000000
[  221.761504][ T1415] R13: ffff88820c7ed000 R14: 0000000000000001 R15: ffffc9000aacb980
[  221.761637][ T1415] FS:  00007f185b955700(0000) GS:ffff8881fdf00000(0000) knlGS:0000000000000000
[  221.761786][ T1415] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  221.761899][ T1415] CR2: 00007f7f6ef43000 CR3: 000000020de38002 CR4: 00000000001706e0
[  221.762029][ T1415] Call Trace:
[ 221.762087][ T1415] xchk_ag_read_headers (kbuild/src/consumer/fs/xfs/scrub/common.c:412 (discriminator 1)) xfs
[ 221.762286][ T1415] xchk_ag_init (kbuild/src/consumer/fs/xfs/scrub/common.c:552) xfs
[ 221.762469][ T1415] xchk_btree_check_block_owner (kbuild/src/consumer/fs/xfs/scrub/common.h:124 kbuild/src/consumer/fs/xfs/scrub/btree.c:377) xfs
[ 221.762731][ T1415] xchk_btree_get_block (kbuild/src/consumer/fs/xfs/scrub/btree.c:561) xfs
[ 221.762926][ T1415] xchk_btree (kbuild/src/consumer/fs/xfs/scrub/btree.c:722) xfs


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install                job.yaml  # job file is attached in this email
        bin/lkp split-job --compatible job.yaml  # generate the yaml file for lkp run
        bin/lkp run                    generated-yaml-file



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang