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SubjectWARNING: lock held when returning to user space in ovl_write_iter

syzbot found the following crash on:

HEAD commit: bdc5461b Add linux-next specific files for 20200224
git tree: linux-next
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:
C reproducer:

The bug was bisected to:

commit 2406a307ac7ddfd7effeeaff6947149ec6a95b4e
Author: Jiufei Xue <>
Date: Wed Nov 20 09:45:26 2019 +0000

ovl: implement async IO routines

bisection log:
final crash:
console output:

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Fixes: 2406a307ac7d ("ovl: implement async IO routines")

WARNING: lock held when returning to user space!
5.6.0-rc2-next-20200224-syzkaller #0 Not tainted
syz-executor184/10029 is leaving the kernel with locks still held!
1 lock held by syz-executor184/10029:
#0: ffff88809987c418 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2903 [inline]
#0: ffff88809987c418 (sb_writers#3){.+.+}, at: ovl_write_iter+0xcc1/0x1090 fs/overlayfs/file.c:348

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For information about bisection process see:
syzbot can test patches for this bug, for details see:

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