------------[ cut here ]------------
kernel BUG at fs/buffer.c:3049!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 17447 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:submit_bh_wbc+0x5e5/0x760 fs/buffer.c:3049
Code: 10 4c 8d 7b 20 48 89 44 24 08 e9 3e fc ff ff e8 41 98 b1 ff f0 80 63 01 f7 e9 4d fb ff ff e8 32 98 b1 ff 0f 0b e8 2b 98 b1 ff <0f> 0b e8 24 98 b1 ff 0f 0b e8 1d 98 b1 ff 0f 0b e8 16 98 b1 ff 0f
RSP: 0018:ffff8880afe7f8f8 EFLAGS: 00010293
RAX: ffff888052b1e540 RBX: ffff888061922f18 RCX: ffffffff81b0e7d1
RDX: 0000000000000000 RSI: ffffffff81b0ed45 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000003000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000034d8d742
FS:  00007f3b4b72e700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74f6d67000 CR3: 00000000afa20000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 read_mmp_block+0x133/0x610 fs/ext4/mmp.c:91
 ext4_multi_mount_protect+0x4f6/0xac0 fs/ext4/mmp.c:358
 ext4_fill_super+0xa050/0xc850 fs/ext4/super.c:4287
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f3b4cdba57a
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:00007f3b4b72df88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f3b4cdba57a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f3b4b72dfe0
RBP: 00007f3b4b72e020 R08: 00007f3b4b72e020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f3b4b72dfe0 R15: 0000000020013800
Modules linked in:
---[ end trace 517afd38ce03edf8 ]---
RIP: 0010:submit_bh_wbc+0x5e5/0x760 fs/buffer.c:3049
Code: 10 4c 8d 7b 20 48 89 44 24 08 e9 3e fc ff ff e8 41 98 b1 ff f0 80 63 01 f7 e9 4d fb ff ff e8 32 98 b1 ff 0f 0b e8 2b 98 b1 ff <0f> 0b e8 24 98 b1 ff 0f 0b e8 1d 98 b1 ff 0f 0b e8 16 98 b1 ff 0f
RSP: 0018:ffff8880afe7f8f8 EFLAGS: 00010293
RAX: ffff888052b1e540 RBX: ffff888061922f18 RCX: ffffffff81b0e7d1
RDX: 0000000000000000 RSI: ffffffff81b0ed45 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000003000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000034d8d742
FS:  00007f3b4b72e700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1a79ce000 CR3: 00000000afa20000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400