[Cluster-devel] [syzbot] general protection fault in gfs2_evict_inode (2)

[syzbot <syzbot+8a5fc6416c175cecea34@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    ca1fdab7fd27 Merge tag 'efi-urgent-for-v5.19-1' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=102e8560080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=542d3d75f0e6f36f
dashboard link: https://syzkaller.appspot.com/bug?extid=8a5fc6416c175cecea34
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8a5fc6416c175cecea34 at syzkaller.appspotmail.com

gfs2: fsid=syz:syz.0: first mount done, others may mount
general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 1 PID: 10573 Comm: syz-executor.0 Not tainted 5.19.0-rc3-syzkaller-00038-gca1fdab7fd27 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:evict_linked_inode fs/gfs2/super.c:1329 [inline]
RIP: 0010:gfs2_evict_inode+0xbf2/0x2030 fs/gfs2/super.c:1384
Code: 03 80 3c 02 00 0f 85 bd 13 00 00 48 8b 9d 00 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e0
RSP: 0018:ffffc90005ae7670 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003a83000
RDX: 0000000000000011 RSI: ffffffff838de301 RDI: 000000000000008c
RBP: ffff88802cd6c000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88802e1a5160 R14: ffff88802e1a5698 R15: ffff88802e1a5610
FS:  00007f4c042c5700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa58679d090 CR3: 000000007d0e3000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 evict+0x2ed/0x6b0 fs/inode.c:664
 iput_final fs/inode.c:1744 [inline]
 iput.part.0+0x562/0x820 fs/inode.c:1770
 iput+0x58/0x70 fs/inode.c:1760
 init_journal fs/gfs2/ops_fstype.c:870 [inline]
 init_inodes+0x28c/0x2720 fs/gfs2/ops_fstype.c:924
 gfs2_fill_super+0x1b49/0x28a0 fs/gfs2/ops_fstype.c:1242
 get_tree_bdev+0x440/0x760 fs/super.c:1292
 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1325
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f4c0308a63a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4c042c4f88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f4c0308a63a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4c042c4fe0
RBP: 00007f4c042c5020 R08: 00007f4c042c5020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f4c042c4fe0 R15: 0000000020047a20
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:evict_linked_inode fs/gfs2/super.c:1329 [inline]
RIP: 0010:gfs2_evict_inode+0xbf2/0x2030 fs/gfs2/super.c:1384
Code: 03 80 3c 02 00 0f 85 bd 13 00 00 48 8b 9d 00 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e0
RSP: 0018:ffffc90005ae7670 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003a83000
RDX: 0000000000000011 RSI: ffffffff838de301 RDI: 000000000000008c
RBP: ffff88802cd6c000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88802e1a5160 R14: ffff88802e1a5698 R15: ffff88802e1a5610
FS:  00007f4c042c5700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa58679d090 CR3: 000000007d0e3000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
   0:	03 80 3c 02 00 0f    	add    0xf00023c(%rax),%eax
   6:	85 bd 13 00 00 48    	test   %edi,0x48000013(%rbp)
   c:	8b 9d 00 09 00 00    	mov    0x900(%rbp),%ebx
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df
  1c:	48 8d bb 8c 00 00 00 	lea    0x8c(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85 e0                	test   %esp,%eax


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