gfs2: fsid=syz:syz.0: fatal: invalid metadata block
  bh = 2072 (magic number)
  function = gfs2_meta_indirect_buffer, file = fs/gfs2/meta_io.c, line = 488
gfs2: fsid=syz:syz.0: about to withdraw this file system
general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 1 PID: 8491 Comm: syz-executor738 Not tainted 5.10.0-rc2-next-20201106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:signal_our_withdraw fs/gfs2/util.c:97 [inline]
RIP: 0010:gfs2_withdraw.cold+0xff/0xc14 fs/gfs2/util.c:294
Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 1c 02 00 00 4c 8b bb 08 09 00 00 b8 ff ff 37 00 48 c1 e0 2a 49 8d 7f 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 74 05 e8 04 e1 fb f8 4d 8b 7f 70 b8 ff ff 37 00 48 c1
RSP: 0018:ffffc900015ff378 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880271e4000 RCX: ffffffff88b5f331
RDX: 000000000000000e RSI: ffffffff88b5f342 RDI: 0000000000000070
RBP: ffff8880271e42c5 R08: 0000000000000038 R09: ffff8880b9f30aa7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880271e40a8
R13: ffff8880271e4348 R14: ffffffff89901d40 R15: 0000000000000000
FS:  00000000013ce880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000143c5000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 gfs2_meta_check_ii+0x68/0xa0 fs/gfs2/util.c:450
 gfs2_metatype_check_i fs/gfs2/util.h:126 [inline]
 gfs2_meta_indirect_buffer+0x3a3/0x3f0 fs/gfs2/meta_io.c:488
 gfs2_meta_inode_buffer fs/gfs2/meta_io.h:70 [inline]
 gfs2_inode_refresh+0x95/0xdf0 fs/gfs2/glops.c:478
 inode_go_lock+0x309/0x4a0 fs/gfs2/glops.c:508
 do_promote+0x4a0/0xb70 fs/gfs2/glock.c:395
 finish_xmote+0x671/0xe40 fs/gfs2/glock.c:562
 do_xmote+0x821/0xbc0 fs/gfs2/glock.c:688
 run_queue+0x323/0x680 fs/gfs2/glock.c:753
 gfs2_glock_nq+0x702/0x1190 fs/gfs2/glock.c:1413
 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline]
 gfs2_lookupi+0x314/0x630 fs/gfs2/inode.c:318
 gfs2_lookup_simple+0x99/0xe0 fs/gfs2/inode.c:269
 init_journal fs/gfs2/ops_fstype.c:714 [inline]
 init_inodes+0x3cb/0x2650 fs/gfs2/ops_fstype.c:857
 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: 0033:0x45b45a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad 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 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffed9604028 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffed9604080 RCX: 000000000045b45a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffed9604040
RBP: 00007ffed9604040 R08: 00007ffed9604080 R09: 00007ffe00000015
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000919
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Modules linked in:
---[ end trace 44bf6a8778581b72 ]---
RIP: 0010:signal_our_withdraw fs/gfs2/util.c:97 [inline]
RIP: 0010:gfs2_withdraw.cold+0xff/0xc14 fs/gfs2/util.c:294
Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 1c 02 00 00 4c 8b bb 08 09 00 00 b8 ff ff 37 00 48 c1 e0 2a 49 8d 7f 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 74 05 e8 04 e1 fb f8 4d 8b 7f 70 b8 ff ff 37 00 48 c1
RSP: 0018:ffffc900015ff378 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880271e4000 RCX: ffffffff88b5f331
RDX: 000000000000000e RSI: ffffffff88b5f342 RDI: 0000000000000070
RBP: ffff8880271e42c5 R08: 0000000000000038 R09: ffff8880b9f30aa7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880271e40a8
R13: ffff8880271e4348 R14: ffffffff89901d40 R15: 0000000000000000
FS:  00000000013ce880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2680410d8 CR3: 00000000143c5000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400