BUG: sleeping function called from invalid context at mm/vmalloc.c:3409
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9521, name: syz.0.854
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
no locks held by syz.0.854/9521.
Preemption disabled at:
[<ffffffff812c5d36>] preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
CPU: 0 UID: 0 PID: 9521 Comm: syz.0.854 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
 __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8957
 vfree+0x75/0xb50 mm/vmalloc.c:3409
 futex_hash_free+0x98/0xc0 kernel/futex/core.c:1742
 __mmdrop+0x33f/0x580 kernel/fork.c:692
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_sched include/linux/sched/mm.h:83 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
 finish_task_switch.isra.0+0x7a4/0xc10 kernel/sched/core.c:5250
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1198/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 class_preempt_destructor include/linux/preempt.h:472 [inline]
 try_to_wake_up+0xa67/0x1870 kernel/sched/core.c:4180
 wake_up_process kernel/sched/core.c:4459 [inline]
 wake_up_q+0xa1/0x130 kernel/sched/core.c:1084
 futex_wake+0x460/0x530 kernel/futex/waitwake.c:198
 do_futex+0x1e3/0x350 kernel/futex/syscalls.c:107
 __do_sys_futex_time32 kernel/futex/syscalls.c:509 [inline]
 __se_sys_futex_time32 kernel/futex/syscalls.c:492 [inline]
 __ia32_sys_futex_time32+0x1d9/0x460 kernel/futex/syscalls.c:492
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fe5579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffc55b5c EFLAGS: 00000246 ORIG_RAX: 00000000000000f0
RAX: ffffffffffffffda RBX: 00000000f74a4f88 RCX: 0000000000000081
RDX: 00000000000f4240 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi