=====================================================
BUG: KMSAN: uninit-value in check_pointer lib/vsprintf.c:705 [inline]
BUG: KMSAN: uninit-value in string+0x3d2/0x700 lib/vsprintf.c:717
 check_pointer lib/vsprintf.c:705 [inline]
 string+0x3d2/0x700 lib/vsprintf.c:717
 vsnprintf+0x224f/0x36a0 lib/vsprintf.c:2797
 sprintf+0x20e/0x260 lib/vsprintf.c:2999
 batadv_mcast_flags_log net/batman-adv/multicast.c:811 [inline]
 batadv_mcast_mla_flags_update net/batman-adv/multicast.c:846 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:889 [inline]
 batadv_mcast_mla_update+0x5059/0x58c0 net/batman-adv/multicast.c:915
 process_one_work+0xdc7/0x1760 kernel/workqueue.c:2297
 worker_thread+0x1101/0x22b0 kernel/workqueue.c:2444
 kthread+0x66b/0x780 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

Local variable ----vfork@kernel_clone created at:
 kernel_clone+0x77/0x10c0 kernel/fork.c:2548
 kernel_thread+0x17a/0x240 kernel/fork.c:2638
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 0 PID: 7442 Comm: kworker/u4:9 Tainted: G    B   W         5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_mcast_mla_update
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106
 dump_stack+0x25/0x28 lib/dump_stack.c:113
 panic+0x44f/0xdeb kernel/panic.c:232
 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:168
 __msan_warning+0xb4/0x100 mm/kmsan/instrumentation.c:199
 check_pointer lib/vsprintf.c:705 [inline]
 string+0x3d2/0x700 lib/vsprintf.c:717
 vsnprintf+0x224f/0x36a0 lib/vsprintf.c:2797
 sprintf+0x20e/0x260 lib/vsprintf.c:2999
 batadv_mcast_flags_log net/batman-adv/multicast.c:811 [inline]
 batadv_mcast_mla_flags_update net/batman-adv/multicast.c:846 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:889 [inline]
 batadv_mcast_mla_update+0x5059/0x58c0 net/batman-adv/multicast.c:915
 process_one_work+0xdc7/0x1760 kernel/workqueue.c:2297
 worker_thread+0x1101/0x22b0 kernel/workqueue.c:2444
 kthread+0x66b/0x780 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
Kernel Offset: disabled
Rebooting in 86400 seconds..