======================================================
WARNING: possible circular locking dependency detected
4.14.215-syzkaller #0 Not tainted
IPVS: Error connecting to the multicast addr
------------------------------------------------------
syz-executor.4/22139 is trying to acquire lock:
 (&oi->lock){+.+.}, at: [<ffffffff82363210>] ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318

but task is already holding lock:
 (sb_writers#6){.+.+}, at: [<ffffffff8190364a>] sb_start_write include/linux/fs.h:1549 [inline]
 (sb_writers#6){.+.+}, at: [<ffffffff8190364a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sb_writers#6){.+.+}:
IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x64/0x260 fs/super.c:1342
       sb_start_write include/linux/fs.h:1549 [inline]
       mnt_want_write+0x3a/0xb0 fs/namespace.c:386
       ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538
       lookup_open+0x77a/0x1750 fs/namei.c:3241
       do_last fs/namei.c:3334 [inline]
       path_openat+0xe08/0x2970 fs/namei.c:3569
       do_filp_open+0x179/0x3c0 fs/namei.c:3603
       do_sys_open+0x296/0x410 fs/open.c:1081
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #1 (&ovl_i_mutex_dir_key[depth]){++++}:
       down_read+0x36/0x80 kernel/locking/rwsem.c:24
       inode_lock_shared include/linux/fs.h:729 [inline]
       lookup_slow+0x129/0x400 fs/namei.c:1674
       lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595
       ovl_lower_positive+0x184/0x345 fs/overlayfs/namei.c:783
       ovl_rename+0x47c/0xf10 fs/overlayfs/dir.c:968
       vfs_rename+0x560/0x1820 fs/namei.c:4496
       SYSC_renameat2 fs/namei.c:4644 [inline]
       SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (&oi->lock){+.+.}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
       ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318
       ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:630
       ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685
       ovl_xattr_set+0x1fc/0x270 fs/overlayfs/inode.c:225
       __vfs_removexattr+0xcf/0x120 fs/xattr.c:416
       cap_inode_killpriv+0x19/0x40 security/commoncap.c:323
       security_inode_killpriv+0x66/0xa0 security/security.c:796
       setattr_prepare+0x116/0x530 fs/attr.c:90
       ovl_setattr+0x27/0x500 fs/overlayfs/inode.c:34
       notify_change+0x56b/0xd10 fs/attr.c:313
       chown_common+0x40b/0x4b0 fs/open.c:631
       SYSC_fchownat fs/open.c:661 [inline]
       SyS_fchownat+0xf6/0x190 fs/open.c:641
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

other info that might help us debug this:

Chain exists of:
  &oi->lock --> &ovl_i_mutex_dir_key[depth] --> sb_writers#6

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#6);
                               lock(&ovl_i_mutex_dir_key[depth]);
                               lock(sb_writers#6);
  lock(&oi->lock);

 *** DEADLOCK ***

3 locks held by syz-executor.4/22139:
 #0:  (sb_writers#17){.+.+}, at: [<ffffffff8190364a>] sb_start_write include/linux/fs.h:1549 [inline]
 #0:  (sb_writers#17){.+.+}, at: [<ffffffff8190364a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
 #1:  (&ovl_i_mutex_key[depth]#2){+.+.}, at: [<ffffffff81887392>] inode_lock include/linux/fs.h:719 [inline]
 #1:  (&ovl_i_mutex_key[depth]#2){+.+.}, at: [<ffffffff81887392>] chown_common+0x272/0x4b0 fs/open.c:628
 #2:  (sb_writers#6){.+.+}, at: [<ffffffff8190364a>] sb_start_write include/linux/fs.h:1549 [inline]
 #2:  (sb_writers#6){.+.+}, at: [<ffffffff8190364a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

stack backtrace:
CPU: 1 PID: 22139 Comm: syz-executor.4 Not tainted 4.14.215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318
 ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:630
 ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685
 ovl_xattr_set+0x1fc/0x270 fs/overlayfs/inode.c:225
 __vfs_removexattr+0xcf/0x120 fs/xattr.c:416
 cap_inode_killpriv+0x19/0x40 security/commoncap.c:323
 security_inode_killpriv+0x66/0xa0 security/security.c:796
 setattr_prepare+0x116/0x530 fs/attr.c:90
 ovl_setattr+0x27/0x500 fs/overlayfs/inode.c:34
 notify_change+0x56b/0xd10 fs/attr.c:313
 chown_common+0x40b/0x4b0 fs/open.c:631
 SYSC_fchownat fs/open.c:661 [inline]
 SyS_fchownat+0xf6/0x190 fs/open.c:641
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e219
RSP: 002b:00007f0679480c68 EFLAGS: 00000246 ORIG_RAX: 000000000000005c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000020000600
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffedb57917f R14: 00007f06794819c0 R15: 000000000119bf8c
IPVS: stopping master sync thread 22144 ...
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ptrace attach of "/root/syz-executor.5"[8013] was attempted by "                                                                ����    g�3S���Z�&�ټά(�q�:\x07��]ωe\x0c���}\x0b \x0a�ǚ'�k,��w�tr��E`����5y\x5c�vA1��G��Z.�m��>��E�0����`����]��ZY�f���oS����A�1�-0E��1Rmʵ�?��Ipe��O${$\x22^0U�ƾ6\x09n�~�`e`����'٭����'L^ �c*�3�8f�v�g�\x5c��i�j)�P�-9 \x0dڝ���^�R@k���w�-c��8\x0br��v�6�R�]��$��D��mڅc;�T��]Z���'�ܴ��\x0b�S���<�y�:�w��%�N)/\x0dev��T���0{,��{���hӥڴ�0�\x5c�E��-��K�N���V�z���N|����d�9I�*Y�b�1��T��W�VuwƀN�W+2bLE�'��Y� ���z9��ی�<hC;���lgT�;]K�(��P�\x0c����s�������r�Ŕ��]S.$�WK5yݥ&���\x094����ܳ�<����������fy;�H�w_��Z���k#�i��,1\x07       ���i�6E)m��>PKz�,�1��-��\x22��~�*�a�>u�H%&�3btrύ���B�J�xš\x09\x1b:�\x0d���O<0P��x���f m���׼3^Z %c��[����R����֌�\x0cǏ�6e��\x1b��qG���vҵ��tJ�o�e_���d��em����A�-0��,�eE��\x0dz�M��{�@��^?�е��\x0bZ��A��ji�tdҽo(A濃 m�;(1�H���g5\x0a�
IPVS: Error connecting to the multicast addr
IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0
IPVS: stopping master sync thread 22186 ...
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ptrace attach of "/root/syz-executor.5"[8013] was attempted by "                                                                ����    g�3S���Z�&�ټά(�q�:\x07��]ωe\x0c���}\x0b \x0a�ǚ'�k,��w�tr��E`����5y\x5c�vA1��G��Z.�m��>��E�0����`����]��ZY�f���oS����A�1�-0E��1Rmʵ�?��Ipe��O${$\x22^0U�ƾ6\x09n�~�`e`����'٭����'L^ �c*�3�8f�v�g�\x5c��i�j)�P�-9 \x0dڝ���^�R@k���w�-c��8\x0br��v�6�R�]��$��D��mڅc;�T��]Z���'�ܴ��\x0b�S���<�y�:�w��%�N)/\x0dev��T���0{,��{���hӥڴ�0�\x5c�E��-��K�N���V�z���N|����d�9I�*Y�b�1��T��W�VuwƀN�W+2bLE�'��Y� ���z9��ی�<hC;���lgT�;]K�(��P�\x0c����s�������r�Ŕ��]S.$�WK5yݥ&���\x094����ܳ�<����������fy;�H�w_��Z���k#�i��,1\x07       ���i�6E)m��>PKz�,�1��-��\x22��~�*�a�>u�H%&�3btrύ���B�J�xš\x09\x1b:�\x0d���O<0P��x���f m���׼3^Z %c��[����R����֌�\x0cǏ�6e��\x1b��qG���vҵ��tJ�o�e_���d��em����A�-0��,�eE��\x0dz�M��{�@��^?�е��\x0bZ��A��ji�tdҽo(A濃 m�;(1�H���g5\x0a�
netlink: 180 bytes leftover after parsing attributes in process `syz-executor.1'.
ptrace attach of "/root/syz-executor.0"[8011] was attempted by "                                                                ����    g�3S���Z�&�ټά(�q�:\x07��]ωe\x0c���}\x0b \x0a�ǚ'�k,��w�tr��E`����5y\x5c�vA1��G��Z.�m��>��E�0����`����]��ZY�f���oS����A�1�-0E��1Rmʵ�?��Ipe��O${$\x22^0U�ƾ6\x09n�~�`e`����'٭����'L^ �c*�3�8f�v�g�\x5c��i�j)�P�-9 \x0dڝ���^�R@k���w�-c��8\x0br��v�6�R�]��$��D��mڅc;�T��]Z���'�ܴ��\x0b�S���<�y�:�w��%�N)/\x0dev��T���0{,��{���hӥڴ�0�\x5c�E��-��K�N���V�z���N|����d�9I�*Y�b�1��T��W�VuwƀN�W+2bLE�'��Y� ���z9��ی�<hC;���lgT�;]K�(��P�\x0c����s�������r�Ŕ��]S.$�WK5yݥ&���\x094����ܳ�<����������fy;�H�w_��Z���k#�i��,1\x07       ���i�6E)m��>PKz�,�1��-��\x22��~�*�a�>u�H%&�3btrύ���B�J�xš\x09\x1b:�\x0d���O<0P��x���f m���׼3^Z %c��[����R����֌�\x0cǏ�6e��\x1b��qG���vҵ��tJ�o�e_���d��em����A�-0��,�eE��\x0dz�M��{�@��^?�е��\x0bZ��A��ji�tdҽo(A濃 m�;(1�H���g5\x0a�
ptrace attach of "/root/syz-executor.5"[8013] was attempted by "                                                                ����    g�3S���Z�&�ټά(�q�:\x07��]ωe\x0c���}\x0b \x0a�ǚ'�k,��w�tr��E`����5y\x5c�vA1��G��Z.�m��>��E�0����`����]��ZY�f���oS����A�1�-0E��1Rmʵ�?��Ipe��O${$\x22^0U�ƾ6\x09n�~�`e`����'٭����'L^ �c*�3�8f�v�g�\x5c��i�j)�P�-9 \x0dڝ���^�R@k���w�-c��8\x0br��v�6�R�]��$��D��mڅc;�T��]Z���'�ܴ��\x0b�S���<�y�:�w��%�N)/\x0dev��T���0{,��{���hӥڴ�0�\x5c�E��-��K�N���V�z���N|����d�9I�*Y�b�1��T��W�VuwƀN�W+2bLE�'��Y� ���z9��ی�<hC;���lgT�;]K�(��P�\x0c����s�������r�Ŕ��]S.$�WK5yݥ&���\x094����ܳ�<����������fy;�H�w_��Z���k#�i��,1\x07       ���i�6E)m��>PKz�,�1��-��\x22��~�*�a�>u�H%&�3btrύ���B�J�xš\x09\x1b:�\x0d���O<0P��x���f m���׼3^Z %c��[����R����֌�\x0cǏ�6e��\x1b��qG���vҵ��tJ�o�e_���d��em����A�-0��,�eE��\x0dz�M��{�@��^?�е��\x0bZ��A��ji�tdҽo(A濃 m�;(1�H���g5\x0a�
netlink: 180 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 180 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 180 bytes leftover after parsing attributes in process `syz-executor.1'.
encrypted_key: insufficient parameters specified
encrypted_key: insufficient parameters specified
xt_connlimit: cannot load conntrack support for address family 10
encrypted_key: insufficient parameters specified
xt_connlimit: cannot load conntrack support for address family 10
encrypted_key: insufficient parameters specified
xt_connlimit: cannot load conntrack support for address family 10
audit: type=1804 audit(1610485134.476:63): pid=22459 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir329461737/syzkaller.pLyZDB/466/bus" dev="sda1" ino=17081 res=1
audit: type=1804 audit(1610485134.526:64): pid=22459 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir329461737/syzkaller.pLyZDB/466/bus" dev="sda1" ino=17081 res=1
audit: type=1804 audit(1610485134.766:65): pid=22466 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir329461737/syzkaller.pLyZDB/467/bus" dev="sda1" ino=17089 res=1
audit: type=1804 audit(1610485135.076:66): pid=22478 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir329461737/syzkaller.pLyZDB/468/bus" dev="sda1" ino=17107 res=1
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
device vlan2 entered promiscuous mode
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
audit: type=1804 audit(1610485135.296:67): pid=22492 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir329461737/syzkaller.pLyZDB/469/bus" dev="sda1" ino=17107 res=1
device vlan2 entered promiscuous mode
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
device vlan2 entered promiscuous mode
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
device vlan2 entered promiscuous mode
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
device vlan2 entered promiscuous mode
PF_BRIDGE: RTM_NEWNEIGH with invalid address
PF_BRIDGE: RTM_NEWNEIGH with invalid address
PF_BRIDGE: RTM_NEWNEIGH with invalid address
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
PF_BRIDGE: RTM_NEWNEIGH with invalid address
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'
libceph: resolve '�d' (ret=-3): failed
libceph: parse_ips bad ip '�d::]'