==================================================================
BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: null-ptr-deref in batadv_iv_send_outstanding_bat_ogm_packet+0x7f/0x790 net/batman-adv/bat_iv_ogm.c:1664
Read of size 4 at addr 0000000000000a80 by task kworker/u4:1/21

CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.1.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 lib/dump_stack.c:113
 kasan_report.cold.6+0x5/0x39 mm/kasan/report.c:321
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/generic.c:191
 kasan_check_read+0x11/0x20 mm/kasan/common.c:102
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x7f/0x790 net/batman-adv/bat_iv_ogm.c:1664
 process_one_work+0x830/0x16a0 kernel/workqueue.c:2269
 worker_thread+0x85/0xb60 kernel/workqueue.c:2415
 kthread+0x324/0x3e0 kernel/kthread.c:253
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 21 Comm: kworker/u4:1 Tainted: G    B             5.1.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 lib/dump_stack.c:113
 panic+0x212/0x40b kernel/panic.c:214
 end_report+0x47/0x4f mm/kasan/report.c:95
 kasan_report.cold.6+0xe/0x39 mm/kasan/report.c:324
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/generic.c:191
 kasan_check_read+0x11/0x20 mm/kasan/common.c:102
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x7f/0x790 net/batman-adv/bat_iv_ogm.c:1664
 process_one_work+0x830/0x16a0 kernel/workqueue.c:2269
 worker_thread+0x85/0xb60 kernel/workqueue.c:2415
 kthread+0x324/0x3e0 kernel/kthread.c:253
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..