=====================================================
BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987
 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987
 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88
 sctp_rcv+0x39e5/0x3c90 net/sctp/input.c:243
 sctp6_rcv+0x48/0xc0 net/sctp/ipv6.c:1126
 ip6_protocol_deliver_rcu+0x1c89/0x2c60 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:480 [inline]
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ip6_input+0x136/0x470 net/ipv6/ip6_input.c:491
 dst_input include/net/dst.h:469 [inline]
 ip6_rcv_finish+0x5a4/0x960 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5977 [inline]
 __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6090
 process_backlog+0x485/0xa00 net/core/dev.c:6442
 __napi_poll+0xda/0x9c0 net/core/dev.c:7414
 napi_poll net/core/dev.c:7478 [inline]
 net_rx_action+0xa59/0x1ac0 net/core/dev.c:7605
 handle_softirqs+0x166/0x6e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x66/0x180 kernel/softirq.c:680
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
 crng_make_state+0x263/0x480 drivers/char/random.c:394
 _get_random_bytes+0x97/0x250 drivers/char/random.c:406
 get_random_bytes+0x26/0x30 drivers/char/random.c:438
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:776 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0xa65/0x1440 drivers/net/netdevsim/dev.c:851
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4154 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4347
 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:601
 pskb_expand_head+0x1fc/0x1610 net/core/skbuff.c:2241
 __skb_cow include/linux/skbuff.h:3777 [inline]
 skb_cow_head include/linux/skbuff.h:3811 [inline]
 batadv_skb_head_push+0x236/0x330 net/batman-adv/mesh-interface.c:71
 batadv_send_skb_packet+0x16d/0x8a0 net/batman-adv/send.c:86
 batadv_send_broadcast_skb+0x3d/0x50 net/batman-adv/send.c:129
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0xb1b/0xde0 net/batman-adv/bat_iv_ogm.c:1708
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

CPU: 0 UID: 0 PID: 1878 Comm: kworker/u8:9 Not tainted 6.16.0-rc3-syzkaller-00233-g35e261cd95dd #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound nsim_dev_trap_report_work
=====================================================