syzbot

bcachefs (loop2): bucket_gens_init... done
bcachefs (loop2): check_snapshot_trees... done
bcachefs (loop2): check_snapshots...
 done
bcachefs (loop2): check_subvols...
=====================================================
BUG: KMSAN: uninit-value in check_subvol fs/bcachefs/subvolume.c:76 [inline]
BUG: KMSAN: uninit-value in bch2_check_subvols+0x1297/0x48c0 fs/bcachefs/subvolume.c:187
 check_subvol fs/bcachefs/subvolume.c:76 [inline]
 bch2_check_subvols+0x1297/0x48c0 fs/bcachefs/subvolume.c:187
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline]
 __bch2_run_recovery_passes+0x49e/0x1330 fs/bcachefs/recovery_passes.c:539
 bch2_run_recovery_passes+0x284/0x310 fs/bcachefs/recovery_passes.c:610
 bch2_fs_recovery+0x53bf/0x66d0 fs/bcachefs/recovery.c:1039
 bch2_fs_start+0x1159/0x1920 fs/bcachefs/super.c:1212
 bch2_fs_get_tree+0x113a/0x2ae0 fs/bcachefs/fs.c:2490
 vfs_get_tree+0xb3/0x5c0 fs/super.c:1804
 do_new_mount+0x738/0x1610 fs/namespace.c:3902
 path_mount+0x6db/0x1e90 fs/namespace.c:4226
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x6eb/0x7d0 fs/namespace.c:4427
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4427
 x64_sys_call+0xfa7/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 ___kmalloc_large_node+0x2e2/0x460 mm/slub.c:4283
 __kmalloc_large_node_noprof+0x3f/0x1f0 mm/slub.c:4300
 __do_kmalloc_node mm/slub.c:4316 [inline]
 __kvmalloc_node_noprof+0x9f/0x1530 mm/slub.c:5015
 btree_node_data_alloc+0xe2/0x5f0 fs/bcachefs/btree_cache.c:150
 __bch2_btree_node_mem_alloc+0x1eb/0x880 fs/bcachefs/btree_cache.c:195
 bch2_fs_btree_cache_init+0x4fc/0xd20 fs/bcachefs/btree_cache.c:656
 bch2_fs_alloc fs/bcachefs/super.c:998 [inline]
 bch2_fs_open+0x46ac/0x54e0 fs/bcachefs/super.c:2432
 bch2_fs_get_tree+0x955/0x2ae0 fs/bcachefs/fs.c:2474
 vfs_get_tree+0xb3/0x5c0 fs/super.c:1804
 do_new_mount+0x738/0x1610 fs/namespace.c:3902
 path_mount+0x6db/0x1e90 fs/namespace.c:4226
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x6eb/0x7d0 fs/namespace.c:4427
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4427
 x64_sys_call+0xfa7/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6242 Comm: syz.2.21 Not tainted 6.16.0-rc4-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================