loop4: detected capacity change from 0 to 32768
=====================================================
BUG: KMSAN: uninit-value in hsr_get_node+0xd05/0xd30 net/hsr/hsr_framereg.c:275
 hsr_get_node+0xd05/0xd30 net/hsr/hsr_framereg.c:275
 fill_frame_info net/hsr/hsr_forward.c:690 [inline]
 hsr_forward_skb+0x3bf/0x3b10 net/hsr/hsr_forward.c:724
 hsr_handle_frame+0xd15/0xf40 net/hsr/hsr_slave.c:78
 __netif_receive_skb_core+0x20ef/0x6f10 net/core/dev.c:5566
 __netif_receive_skb_one_core net/core/dev.c:5670 [inline]
 __netif_receive_skb+0xca/0xa00 net/core/dev.c:5785
 netif_receive_skb_internal net/core/dev.c:5871 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5930
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1550
 tun_get_user+0x5246/0x6dd0 drivers/net/tun.c:2007
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4774
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2344
 skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:3020
 tun_build_skb drivers/net/tun.c:1681 [inline]
 tun_get_user+0xe0f/0x6dd0 drivers/net/tun.c:1824
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 10741 Comm: syz.4.1199 Not tainted 6.12.0-syzkaller-11930-g0e287d31b62b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================