ret
WARNING: mm/vmalloc.c:1820 at va_alloc mm/vmalloc.c:1820 [inline], CPU#3: kworker/u33:7/821
WARNING: mm/vmalloc.c:1820 at __alloc_vmap_area mm/vmalloc.c:1855 [inline], CPU#3: kworker/u33:7/821
WARNING: mm/vmalloc.c:1820 at alloc_vmap_area+0x17f6/0x2bb0 mm/vmalloc.c:2073, CPU#3: kworker/u33:7/821
Modules linked in:
CPU: 3 UID: 0 PID: 821 Comm: kworker/u33:7 Tainted: G S                  syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC
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 8d d8 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 7b b0 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:ffffc90004627458 EFLAGS: 00010293
RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000002800
RDX: ffff888025aa8000 RSI: ffffffff8266fbe5 RDI: ffffffff8e46c938
RBP: ffffc90003389000 R08: 00000000ffffffff R09: fffffbfff1dbda96
R10: ffffffff8eded4b3 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90003399000 R14: ffffe8ffffffffff R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096ee3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7f3a190 CR3: 000000002228f000 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>