syz_tun: entered promiscuous mode
batadv_slave_0: entered promiscuous mode
=====================================================
BUG: KMSAN: uninit-value in hsr_get_node+0xd4a/0xd70 net/hsr/hsr_framereg.c:279
 hsr_get_node+0xd4a/0xd70 net/hsr/hsr_framereg.c:279
 fill_frame_info net/hsr/hsr_forward.c:690 [inline]
 hsr_forward_skb+0x399/0x3c40 net/hsr/hsr_forward.c:729
 hsr_handle_frame+0xcea/0xf70 net/hsr/hsr_slave.c:78
 __netif_receive_skb_core+0x2040/0x6df0 net/core/dev.c:5866
 __netif_receive_skb_one_core net/core/dev.c:5977 [inline]
 __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6092
 netif_receive_skb_internal net/core/dev.c:6178 [inline]
 netif_receive_skb+0x57/0x630 net/core/dev.c:6237
 tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
 tun_get_user+0x5028/0x6ca0 drivers/net/tun.c:1950
 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1996
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0xbe2/0x15d0 fs/read_write.c:686
 ksys_write fs/read_write.c:738 [inline]
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
 x64_sys_call+0x3014/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:2
 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 stored to memory at:
 hsr_get_node+0xd43/0xd70 net/hsr/hsr_framereg.c:-1
 fill_frame_info net/hsr/hsr_forward.c:690 [inline]
 hsr_forward_skb+0x399/0x3c40 net/hsr/hsr_forward.c:729
 hsr_handle_frame+0xcea/0xf70 net/hsr/hsr_slave.c:78
 __netif_receive_skb_core+0x2040/0x6df0 net/core/dev.c:5866
 __netif_receive_skb_one_core net/core/dev.c:5977 [inline]
 __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6092
 netif_receive_skb_internal net/core/dev.c:6178 [inline]
 netif_receive_skb+0x57/0x630 net/core/dev.c:6237
 tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
 tun_get_user+0x5028/0x6ca0 drivers/net/tun.c:1950
 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1996
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0xbe2/0x15d0 fs/read_write.c:686
 ksys_write fs/read_write.c:738 [inline]
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
 x64_sys_call+0x3014/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:2
 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:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5171
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x102/0x280 mm/mempolicy.c:2507
 skb_page_frag_refill+0x34e/0x740 net/core/sock.c:3131
 tun_build_skb drivers/net/tun.c:1620 [inline]
 tun_get_user+0x1d71/0x6ca0 drivers/net/tun.c:1770
 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1996
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0xbe2/0x15d0 fs/read_write.c:686
 ksys_write fs/read_write.c:738 [inline]
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
 x64_sys_call+0x3014/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0 UID: 0 PID: 6106 Comm: syz-executor.0 Not tainted 6.17.0-rc2-syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================