general protection fault in gfs2_ri_update

[syzbot <syzbot+e3f23ce40269a4c9053a@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    92edc4ae Add linux-next specific files for 20201113
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1564a81c500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=79ad4f8ad2d96176
dashboard link: https://syzkaller.appspot.com/bug?extid=e3f23ce40269a4c9053a
compiler:       gcc (GCC) 10.1.0-syz 20200507

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+e3f23ce40269a4c9053a@syzkaller.appspotmail.com

gfs2: fsid=syz:syz: Now mounting FS...
gfs2: fsid=syz:syz.0: journal 0 mapped with 1 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 0 PID: 5537 Comm: syz-executor.4 Not tainted 5.10.0-rc3-next-20201113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:set_rgrp_preferences fs/gfs2/rgrp.c:960 [inline]
RIP: 0010:gfs2_ri_update+0x289/0x520 fs/gfs2/rgrp.c:988
Code: e0 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 3c e7 22 fe 49 8d 7f 74 48 b8 00 00 00 00 00 fc ff df 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 68
RSP: 0018:ffffc9000175f7e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900122b2000
RDX: 000000000000000e RSI: ffffffff834dace4 RDI: 0000000000000074
RBP: ffff8880680847d0 R08: 0000000000000000 R09: ffff8880680847d3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880680847cc R15: 0000000000000000
FS:  00007fccb3d41700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055af34aaf000 CR3: 0000000025b49000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 gfs2_rindex_update+0x3ce/0x450 fs/gfs2/rgrp.c:1028
 init_inodes+0x1ddf/0x2650 fs/gfs2/ops_fstype.c:885
 gfs2_fill_super+0x199c/0x23f0 fs/gfs2/ops_fstype.c:1184
 get_tree_bdev+0x421/0x740 fs/super.c:1344
 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1260
 vfs_get_tree+0x89/0x2f0 fs/super.c:1549
 do_new_mount fs/namespace.c:2896 [inline]
 path_mount+0x12ae/0x1e70 fs/namespace.c:3227
 do_mount fs/namespace.c:3240 [inline]
 __do_sys_mount fs/namespace.c:3448 [inline]
 __se_sys_mount fs/namespace.c:3425 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x46090a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fccb3d40a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fccb3d40b20 RCX: 000000000046090a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fccb3d40ae0
RBP: 00007fccb3d40ae0 R08: 00007fccb3d40b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20
Modules linked in:
---[ end trace 30aa056702410d7c ]---
RIP: 0010:set_rgrp_preferences fs/gfs2/rgrp.c:960 [inline]
RIP: 0010:gfs2_ri_update+0x289/0x520 fs/gfs2/rgrp.c:988
Code: e0 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 3c e7 22 fe 49 8d 7f 74 48 b8 00 00 00 00 00 fc ff df 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 68
RSP: 0018:ffffc9000175f7e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900122b2000
RDX: 000000000000000e RSI: ffffffff834dace4 RDI: 0000000000000074
RBP: ffff8880680847d0 R08: 0000000000000000 R09: ffff8880680847d3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880680847cc R15: 0000000000000000
FS:  00007fccb3d41700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055af34a29900 CR3: 0000000025b49000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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