kmem_cache               180KB        218KB
Out of memory and no killable processes...
Kernel panic - not syncing: System is deadlocked on memory
CPU: 3 UID: 0 PID: 12 Comm: kworker/u32:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 vpanic+0x553/0x970 kernel/panic.c:651
 panic+0xd1/0xe0 kernel/panic.c:788
 out_of_memory.cold+0xa2/0x170 mm/oom_kill.c:1166
 __alloc_pages_may_oom mm/page_alloc.c:4113 [inline]
 __alloc_pages_slowpath mm/page_alloc.c:5030 [inline]
 __alloc_frozen_pages_noprof+0x2852/0x3300 mm/page_alloc.c:5449
 alloc_pages_mpol+0x201/0x550 mm/mempolicy.c:2486
 alloc_pages_noprof+0x1a/0x160 mm/mempolicy.c:2577
 get_free_pages_noprof+0x10/0xb0 mm/page_alloc.c:5507
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:364 [inline]
 __kasan_populate_vmalloc+0xa0/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2145
 __get_vm_area_node+0x1ed/0x350 mm/vmalloc.c:3248
 __vmalloc_node_range_noprof+0x268/0x1420 mm/vmalloc.c:4064
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4165
 __vmalloc_noprof+0xa3/0x120 mm/vmalloc.c:4181
 nh_notifier_res_table_info_init net/ipv4/nexthop.c:172 [inline]
 nh_notifier_grp_info_init+0x1c8/0xa80 net/ipv4/nexthop.c:202
 nh_notifier_info_init net/ipv4/nexthop.c:223 [inline]
 call_nexthop_notifier net/ipv4/nexthop.c:449 [inline]
 nexthops_dump+0x18d/0x330 net/ipv4/nexthop.c:4031
 __unregister_nexthop_notifier net/ipv4/nexthop.c:4063 [inline]
 __unregister_nexthop_notifier net/ipv4/nexthop.c:4056 [inline]
 unregister_nexthop_notifier+0x5f/0x70 net/ipv4/nexthop.c:4073
 nsim_fib_destroy+0xb1/0x1b0 drivers/net/netdevsim/fib.c:1659
 nsim_dev_reload_destroy+0x16f/0x490 drivers/net/netdevsim/dev.c:1714
 nsim_dev_reload_down+0x66/0xd0 drivers/net/netdevsim/dev.c:963
 devlink_reload+0x1ae/0x7a0 net/devlink/dev.c:462
 devlink_pernet_pre_exit+0x247/0x370 net/devlink/core.c:578
 ops_pre_exit_list net/core/net_namespace.c:161 [inline]
 ops_undo_list+0x187/0xab0 net/core/net_namespace.c:235
 cleanup_net+0x499/0x920 net/core/net_namespace.c:706
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..