u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 27c2ec7b8e70cb08 written 16 min_key POS_MIN durability: 1 ptr: 0:31:0 gen 0
  node offset 0/16 bset u64s 0: incorrect btree id
bcachefs (loop0): inconsistency detected - emergency read only at journal seq 10
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/recovery.c:38:10
shift exponent 255 is too large for 64-bit type 'unsigned long long'
CPU: 1 PID: 2354 Comm: syz-executor.0 Not tainted 6.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x3e/0xe0 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x248/0x270 lib/ubsan.c:454
 bch2_btree_lost_data+0xb0/0xc0 fs/bcachefs/recovery.c:38
 bch2_btree_node_read_done+0x1516/0x18c0 fs/bcachefs/btree_io.c:1271
 btree_node_read_work+0x261/0x5c0 fs/bcachefs/btree_io.c:1323
 bch2_btree_node_read+0xcd7/0xf70
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1745 [inline]
 bch2_btree_root_read+0x1da/0x300 fs/bcachefs/btree_io.c:1769
 read_btree_roots+0x112/0x250 fs/bcachefs/recovery.c:468
 bch2_fs_recovery+0x1009/0x16c0 fs/bcachefs/recovery.c:796
 bch2_fs_start+0x1b9/0x270 fs/bcachefs/super.c:1037
 bch2_fs_open+0xd24/0x13c0 fs/bcachefs/super.c:2096
 bch2_mount+0x277/0x5c0 fs/bcachefs/fs.c:1900
 legacy_get_tree+0x2d/0x60 fs/fs_context.c:662
 vfs_get_tree+0x24/0xb0 fs/super.c:1797
 do_new_mount+0x15a/0x3a0 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x14b/0x1c0 fs/namespace.c:3875
 do_syscall_64+0x95/0x1b0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7fae95e7e5ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae96b8fef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fae96b8ff80 RCX: 00007fae95e7e5ea
RDX: 0000000020011a00 RSI: 0000000020000080 RDI: 00007fae96b8ff40
RBP: 0000000020011a00 R08: 00007fae96b8ff80 R09: 0000000001200014
R10: 0000000001200014 R11: 0000000000000246 R12: 0000000020000080
R13: 00007fae96b8ff40 R14: 0000000000011a03 R15: 0000000020000100
 </TASK>
---[ end trace ]---