BTRFS error (device loop0): superblock checksum mismatch
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BTRFS error (device loop0): open_ctree failed
__btrfs_alloc_chunk: found more than 0 devices
BTRFS error (device loop2): unsupported checksum algorithm 2
WARNING: CPU: 0 PID: 6490 at fs/btrfs/volumes.c:4743 __btrfs_alloc_chunk+0x1604/0x1a80 fs/btrfs/volumes.c:4743
BTRFS error (device loop2): superblock checksum mismatch
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6490 Comm: syz-executor.5 Not tainted 4.19.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x61 kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__btrfs_alloc_chunk+0x1604/0x1a80 fs/btrfs/volumes.c:4743
Code: 8b bc 24 8c 00 00 00 4c 89 0c 24 e8 86 8c 90 fe 4c 8b 0c 24 48 c7 c6 e0 d4 be 87 48 c7 c7 c0 b1 be 87 4c 89 ca e8 97 82 64 fe <0f> 0b 8b 9c 24 88 00 00 00 4c 8b 0c 24 f7 db 23 5c 24 08 e9 b8 f1
RSP: 0018:ffff8880605b7258 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888085856000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8154d001 RDI: ffffed100c0b6e3d
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000008000000 R14: 0000000005800000 R15: 0000000000000001
 do_chunk_alloc+0x4e8/0xb70 fs/btrfs/extent-tree.c:4524
 find_free_extent+0x223f/0x3b20 fs/btrfs/extent-tree.c:7659
 btrfs_reserve_extent+0x296/0x440 fs/btrfs/extent-tree.c:7817
 btrfs_alloc_tree_block+0x3f2/0x15f0 fs/btrfs/extent-tree.c:8276
 alloc_tree_block_no_bg_flush+0x1b6/0x250 fs/btrfs/ctree.c:1036
 __btrfs_cow_block+0x3cb/0x1010 fs/btrfs/ctree.c:1091
 btrfs_cow_block+0x276/0x840 fs/btrfs/ctree.c:1526
 commit_cowonly_roots+0x129/0xc30 fs/btrfs/transaction.c:1160
 btrfs_commit_transaction+0x94a/0x2480 fs/btrfs/transaction.c:2215
 btrfs_commit_super+0xc1/0x100 fs/btrfs/disk-io.c:3932
 close_ctree+0x618/0x850 fs/btrfs/disk-io.c:3992
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_anon_super+0x36/0x60 fs/super.c:1032
 btrfs_kill_super+0x49/0x550 fs/btrfs/super.c:2213
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460027
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff8d367748 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000460027
RDX: 0000000000403188 RSI: 0000000000000002 RDI: 00007fff8d3677f0
RBP: 000000000000214b R08: 0000000000000000 R09: 000000000000000c
R10: 0000000000000005 R11: 0000000000000246 R12: 00007fff8d368880
R13: 0000000001da7a60 R14: 0000000000000000 R15: 00007fff8d368880
Kernel Offset: disabled
Rebooting in 86400 seconds..