[syzbot] BUG: sleeping function called from invalid context in munlock_vma_pages_range

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    98f7fdced2e0 Merge tag 'irq-urgent-2021-07-11' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13576e9c300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=da2203b984f4af9f
dashboard link: https://syzkaller.appspot.com/bug?extid=2e3ee45ea14cd0b81f26
compiler:       Debian clang version 11.0.1-2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e3ee45ea14cd0b81f26@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: sleeping function called from invalid context at mm/mlock.c:482
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14373, name: syz-executor.5
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 14373 Comm: syz-executor.5 Tainted: G        W         5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1d3/0x29f lib/dump_stack.c:105
 ___might_sleep+0x4e5/0x6b0 kernel/sched/core.c:9154
 munlock_vma_pages_range+0xa80/0xf60 mm/mlock.c:482
 mlock_fixup+0x40f/0x580 mm/mlock.c:552
 apply_mlockall_flags mm/mlock.c:768 [inline]
 __do_sys_munlockall+0x1ef/0x310 mm/mlock.c:810
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f448bc37188 EFLAGS: 00000246 ORIG_RAX: 0000000000000098
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe7eb2d2ef R14: 00007f448bc37300 R15: 0000000000022000


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