ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
=====================================================
BUG: KMSAN: uninit-value in vsnprintf+0x15be/0x1b00 lib/vsprintf.c:2912
 vsnprintf+0x15be/0x1b00 lib/vsprintf.c:2912
 nf_log_trace+0x232/0x2c0 net/netfilter/nf_log.c:282
 trace_packet+0x5ca/0x770 net/ipv4/netfilter/ip_tables.c:209
 ipt_do_table+0x1a62/0x2150 net/ipv4/netfilter/ip_tables.c:306
 iptable_mangle_hook+0x429/0x670 net/ipv4/netfilter/iptable_mangle.c:80
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:273 [inline]
 NF_HOOK include/linux/netfilter.h:316 [inline]
 ip_local_deliver+0x39d/0x4a0 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:480 [inline]
 ip_rcv_finish+0x4d7/0x560 net/ipv4/ip_input.c:492
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x370 net/ipv4/ip_input.c:612
 __netif_receive_skb_one_core net/core/dev.c:6202 [inline]
 __netif_receive_skb net/core/dev.c:6315 [inline]
 process_backlog+0x8d7/0x1500 net/core/dev.c:6666
 __napi_poll+0xdc/0x910 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0xa5b/0x1c70 net/core/dev.c:7953
 handle_softirqs+0x171/0x7b0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656
 do_softirq+0x58/0x90 kernel/softirq.c:523
 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:450
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:196 [inline]
 _raw_spin_unlock_bh+0x2d/0x40 kernel/locking/spinlock.c:214
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_tt_local_purge+0x4dc/0x5a0 net/batman-adv/translation-table.c:1355
 batadv_tt_purge+0x39/0x1250 net/batman-adv/translation-table.c:3549
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb65/0x1e40 kernel/workqueue.c:3397
 worker_thread+0xee4/0x1590 kernel/workqueue.c:3478
 kthread+0x53a/0x5f0 kernel/kthread.c:436
 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was stored to memory at:
 vsnprintf+0x15b7/0x1b00 lib/vsprintf.c:-1
 nf_log_trace+0x232/0x2c0 net/netfilter/nf_log.c:282
 trace_packet+0x5ca/0x770 net/ipv4/netfilter/ip_tables.c:209
 ipt_do_table+0x1a62/0x2150 net/ipv4/netfilter/ip_tables.c:306
 iptable_mangle_hook+0x429/0x670 net/ipv4/netfilter/iptable_mangle.c:80
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:273 [inline]
 NF_HOOK include/linux/netfilter.h:316 [inline]
 ip_local_deliver+0x39d/0x4a0 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:480 [inline]
 ip_rcv_finish+0x4d7/0x560 net/ipv4/ip_input.c:492
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x370 net/ipv4/ip_input.c:612
 __netif_receive_skb_one_core net/core/dev.c:6202 [inline]
 __netif_receive_skb net/core/dev.c:6315 [inline]
 process_backlog+0x8d7/0x1500 net/core/dev.c:6666
 __napi_poll+0xdc/0x910 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0xa5b/0x1c70 net/core/dev.c:7953
 handle_softirqs+0x171/0x7b0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656

Local variable prefix created at:
 nf_log_trace+0xee/0x2c0 net/netfilter/nf_log.c:275
 trace_packet+0x5ca/0x770 net/ipv4/netfilter/ip_tables.c:209

CPU: 1 UID: 0 PID: 11376 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: bat_events batadv_tt_purge
=====================================================