netlink: 8 bytes leftover after parsing attributes in process `syz.0.0'.
loop0: detected capacity change from 0 to 32768
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
bcachefs (loop0): recovering from clean shutdown, journal seq 10
bcachefs (loop0): Version upgrade required:
Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete
Doing incompatible version upgrade from 0.24: unwritten_extents to 1.13: inode_has_child_snapshots
  running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,set_fs_needs_rebalance
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/alloc_background.h:165:13
shift exponent 255 is too large for 32-bit type 'unsigned int'
CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 data_type_movable fs/bcachefs/alloc_background.h:165 [inline]
 alloc_lru_idx_fragmentation fs/bcachefs/alloc_background.h:171 [inline]
 bch2_alloc_to_text+0xc79/0xce0 fs/bcachefs/alloc_background.c:369
 __bch2_bkey_fsck_err+0x1c8/0x280 fs/bcachefs/error.c:457
 bch2_alloc_v4_validate+0x931/0xef0 fs/bcachefs/alloc_background.c:259
 bch2_btree_node_read_done+0x3e7e/0x5e90 fs/bcachefs/btree_io.c:1223
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1327
 bch2_btree_node_read+0x2433/0x2a10
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1753 [inline]
 bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1775
 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:524
 bch2_fs_recovery+0x2585/0x39c0 fs/bcachefs/recovery.c:854
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1036
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6cc37feba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb6cd1dfe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb6cd1dfef0 RCX: 00007fb6cc37feba
RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007fb6cd1dfeb0
RBP: 00000000200058c0 R08: 00007fb6cd1dfef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020005900
R13: 00007fb6cd1dfeb0 R14: 00000000000058c3 R15: 0000000020000240
 </TASK>
---[ end trace ]---