BUG: sleeping function called from invalid context at mm/vmalloc.c:3409
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 16226, name: dhcpcd
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffffff8b91af20>] __schedule_loop kernel/sched/core.c:7042 [inline]
[<ffffffff8b91af20>] schedule+0xe0/0x3a0 kernel/sched/core.c:7058
CPU: 3 UID: 0 PID: 16226 Comm: dhcpcd 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
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 io_schedule+0xbf/0x130 kernel/sched/core.c:7903
 bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
 __wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
 wait_on_bit_io include/linux/wait_bit.h:105 [inline]
 __wait_on_buffer+0x64/0x70 fs/buffer.c:123
 wait_on_buffer include/linux/buffer_head.h:420 [inline]
 __ext4_find_entry+0x97b/0x11c0 fs/ext4/namei.c:1611
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x53d/0x730 fs/ext4/namei.c:1771
 lookup_open.isra.0+0x4d7/0x1580 fs/namei.c:3686
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x893/0x2cb0 fs/namei.c:4043
 do_filp_open+0x20b/0x470 fs/namei.c:4073
 do_open_execat+0xf9/0x3a0 fs/exec.c:783
 alloc_bprm+0x2d/0x710 fs/exec.c:1410
 do_execveat_common.isra.0+0x1ce/0x610 fs/exec.c:1811
 do_execve fs/exec.c:1934 [inline]
 __do_sys_execve fs/exec.c:2010 [inline]
 __se_sys_execve fs/exec.c:2005 [inline]
 __x64_sys_execve+0x8e/0xb0 fs/exec.c:2005
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47630cd107
Code: 0f 00 64 c7 00 07 00 00 00 b8 ff ff ff ff c9 c3 0f 1f 00 48 8b 05 a9 ee 0f 00 48 8b 10 e9 01 00 00 00 90 b8 3b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 ec 0f 00 f7 d8 64 89 01 48
RSP: 002b:00007f4762f36e68 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007ffde79b33e0 RCX: 00007f47630cd107
RDX: 00005603c84a6ff0 RSI: 00007ffde79b35d0 RDI: 00005603a71af6bd
RBP: 00007f4762f36ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 0000000000000001
R13: 00007ffde79b30c0 R14: 00007f4762f36f20 R15: 0000000000000040
 </TASK>