=====================================================
BUG: KMSAN: uninit-value in rht_ptr_rcu include/linux/rhashtable.h:376 [inline]
BUG: KMSAN: uninit-value in __rhashtable_lookup include/linux/rhashtable.h:607 [inline]
BUG: KMSAN: uninit-value in rhashtable_lookup include/linux/rhashtable.h:646 [inline]
BUG: KMSAN: uninit-value in rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline]
BUG: KMSAN: uninit-value in bucket_in_flight fs/bcachefs/movinggc.c:144 [inline]
BUG: KMSAN: uninit-value in bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
BUG: KMSAN: uninit-value in bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:221
 rht_ptr_rcu include/linux/rhashtable.h:376 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:607 [inline]
 rhashtable_lookup include/linux/rhashtable.h:646 [inline]
 rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline]
 bucket_in_flight fs/bcachefs/movinggc.c:144 [inline]
 bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
 bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:221
 bch2_copygc_thread+0x7f7/0xfa0 fs/bcachefs/movinggc.c:381
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Local variable b205.i created at:
 bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
 bch2_copygc+0x15b3/0x58f0 fs/bcachefs/movinggc.c:221
 bch2_copygc_thread+0x7f7/0xfa0 fs/bcachefs/movinggc.c:381

CPU: 1 UID: 0 PID: 19523 Comm: bch-copygc/loop Tainted: G        W          6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
=====================================================