nr0
: entered promiscuous mode
=====================================================
BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2641 [inline]
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2655 [inline]
BUG: KMSAN: uninit-value in llc_fixup_skb net/llc/llc_input.c:134 [inline]
BUG: KMSAN: uninit-value in llc_rcv+0x119e/0x1540 net/llc/llc_input.c:180
 pskb_may_pull_reason include/linux/skbuff.h:2641 [inline]
 pskb_may_pull include/linux/skbuff.h:2655 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x119e/0x1540 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5480 [inline]
 __netif_receive_skb+0x1b8/0x5e0 net/core/dev.c:5594
 netif_receive_skb_internal net/core/dev.c:5680 [inline]
 netif_receive_skb+0x68/0x680 net/core/dev.c:5739
 tun_rx_batched+0x837/0x930
 tun_get_user+0x591d/0x7070 drivers/net/tun.c:1988
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2034
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x834/0x1580 fs/read_write.c:584
 ksys_write+0x21f/0x4f0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:774
 slab_alloc_node mm/slub.c:3452 [inline]
 kmem_cache_alloc_node+0x543/0xab0 mm/slub.c:3497
 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:520
 __alloc_skb+0x3a7/0x850 net/core/skbuff.c:606
 alloc_skb include/linux/skbuff.h:1277 [inline]
 alloc_skb_with_frags+0xbd/0xbb0 net/core/skbuff.c:6318
 sock_alloc_send_pskb+0xaad/0xc30 net/core/sock.c:2734
 tun_alloc_skb drivers/net/tun.c:1528 [inline]
 tun_get_user+0x2167/0x7070 drivers/net/tun.c:1840
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2034
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x834/0x1580 fs/read_write.c:584
 ksys_write+0x21f/0x4f0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CPU: 1 PID: 8847 Comm: syz-executor313 Not tainted 6.3.0-rc7-syzkaller-00014-g0255004d2a8e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
=====================================================