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Subjectlinux-next: WARNING: CPU: 1 PID: 24110 at fs/dcache.c:1445 umount_check+0x81/0x90
Hello,

We run CRIU tests on linux-next periodically and here is a new bug:

[ 430.017231] BUG: Dentry ffff8e4ab9a7b6c0{i=41b2e,n=default} still
in use (1) [unmount of proc proc]
[ 430.027843] ------------[ cut here ]------------
[ 430.027854] WARNING: CPU: 1 PID: 24110 at fs/dcache.c:1445
umount_check+0x81/0x90
[ 430.027857] Modules linked in: bridge stp llc nf_conntrack_netlink
nfnetlink autofs4 netlink_diag af_packet_diag udp_diag tcp_diag
inet_diag unix_diag ip6table_filter ip6_tables binfmt_misc dm_crypt
ppdev xt_tcpudp xt_conntrack xt_mark iptable_filter ipt_MASQUERADE
nf_nat_masquerade_ipv4 xt_addrtype iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c ip_tables
x_tables parport_pc input_leds serio_raw parport pvpanic i2c_piix4
mac_hid btrfs xor raid6_pq crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel aes_x86_64 crypto_simd cryptd
glue_helper psmouse virtio_scsi
[ 430.027962] CPU: 1 PID: 24110 Comm: zdtm_ct Not tainted
4.11.0-rc1-next-20170309 #1
[ 430.027964] Hardware name: Google Google Compute Engine/Google
Compute Engine, BIOS Google 01/01/2011
[ 430.027966] Call Trace:
[ 430.027975] dump_stack+0x85/0xc9
[ 430.027983] __warn+0xd1/0xf0
[ 430.027989] ? dentry_free+0x90/0x90
[ 430.027993] warn_slowpath_null+0x1d/0x20
[ 430.027996] umount_check+0x81/0x90
[ 430.027999] d_walk+0xef/0x4e0
[ 430.028005] ? do_one_tree+0x26/0x40
[ 430.028015] do_one_tree+0x26/0x40
[ 430.028019] shrink_dcache_for_umount+0x2d/0xa0
[ 430.028024] generic_shutdown_super+0x1f/0x100
[ 430.028028] kill_anon_super+0x12/0x20
[ 430.028033] proc_kill_sb+0x40/0x50
[ 430.028037] deactivate_locked_super+0x43/0x70
[ 430.028041] deactivate_super+0x46/0x60
[ 430.028047] cleanup_mnt+0x3f/0x80
[ 430.028050] __cleanup_mnt+0x12/0x20
[ 430.028056] task_work_run+0x83/0xc0
[ 430.028061] do_exit+0x318/0xc90
[ 430.028068] ? trace_hardirqs_on_caller+0xf9/0x1c0
[ 430.028073] do_group_exit+0x4c/0xc0
[ 430.028077] SyS_exit_group+0x14/0x20
[ 430.028083] entry_SYSCALL_64_fastpath+0x23/0xc2
[ 430.028086] RIP: 0033:0x2af672eb81b9
[ 430.028088] RSP: 002b:00007fffbccef618 EFLAGS: 00000246 ORIG_RAX:
00000000000000e7
[ 430.028092] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00002af672eb81b9
[ 430.028094] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 430.028096] RBP: 00007fffbccef610 R08: 000000000000003c R09: 00000000000000e7
[ 430.028098] R10: ffffffffffffff60 R11: 0000000000000246 R12: 0000000000000001
[ 430.028100] R13: 00002af6731b6e80 R14: 0000000000000000 R15: 00007fffbccef580
[ 430.028137] ---[ end trace 0cacf4b67ee7d0c5 ]---
[ 430.028959] VFS: Busy inodes after unmount of proc. Self-destruct
in 5 seconds. Have a nice day...

The kernel version is 4.11.0-rc1-next-20170309. All logs can be found
here https://s3.amazonaws.com/archive.travis-ci.org/jobs/209578615/log.txt.

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