WARNING: mm/vmalloc.c:1820 at va_alloc mm/vmalloc.c:1820 [inline], CPU#0: kworker/u33:1/37
WARNING: mm/vmalloc.c:1820 at __alloc_vmap_area mm/vmalloc.c:1855 [inline], CPU#0: kworker/u33:1/37
WARNING: mm/vmalloc.c:1820 at alloc_vmap_area+0x17f6/0x2bb0 mm/vmalloc.c:2073, CPU#0: kworker/u33:1/37
Modules linked in:

CPU: 0 UID: 0 PID: 37 Comm: kworker/u33:1 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: events_unbound call_usermodehelper_exec_work

RIP: 0010:va_alloc mm/vmalloc.c:1820 [inline]
RIP: 0010:__alloc_vmap_area mm/vmalloc.c:1855 [inline]
RIP: 0010:alloc_vmap_area+0x17f6/0x2bb0 mm/vmalloc.c:2073
Code: 48 8d 3d 0d d4 c0 0e 8b 74 24 10 67 48 0f b9 3a c7 44 24 70 00 00 00 00 e9 95 ed ff ff 48 c7 c3 ea ff ff ff e8 fb b1 a2 ff 90 <0f> 0b 90 41 be 01 00 00 00 e9 ae f9 ff ff 41 be 01 00 00 00 48 c7
RSP: 0018:ffffc90000607458 EFLAGS: 00010293

RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000002800
RDX: ffff88801d374a80 RSI: ffffffff8266fa65 RDI: ffffffff8e46c920
RBP: ffffc9000ee11000 R08: 00000000ffffffff R09: fffffbfff1dbda1e
R10: ffffffff8eded0f3 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000ee21000 R14: ffffe8ffffffffff R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096be3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d821ea240 CR3: 000000004b305000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4042
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4143
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:929 [inline]
 copy_process+0x7fb/0x8030 kernel/fork.c:2115
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 user_mode_thread+0xcc/0x110 kernel/fork.c:2824
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x6b/0x180 kernel/umh.c:163
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>