======================================================
WARNING: possible circular locking dependency detected
4.13.0-next-20170912+ #20 Not tainted
------------------------------------------------------
syz-executor5/10329 is trying to acquire lock:
(console_lock){+.+.}, at: [<ffffffff8271e539>] vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:218
but task is already holding lock:
(&pipe->mutex/1){+.+.}, at: [<ffffffff81ac0fa6>] pipe_lock_nested fs/pipe.c:66 [inline]
(&pipe->mutex/1){+.+.}, at: [<ffffffff81ac0fa6>] pipe_lock+0x56/0x70 fs/pipe.c:74
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&pipe->mutex/1){+.+.}:
check_prevs_add kernel/locking/lockdep.c:2020 [inline]
validate_chain kernel/locking/lockdep.c:2469 [inline]
__lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1870 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
pipe_lock_nested fs/pipe.c:66 [inline]
pipe_lock+0x56/0x70 fs/pipe.c:74
iter_file_splice_write+0x264/0xf50 fs/splice.c:699
do_splice_from fs/splice.c:851 [inline]
do_splice fs/splice.c:1147 [inline]
SYSC_splice fs/splice.c:1402 [inline]
SyS_splice+0x7d5/0x1630 fs/splice.c:1382
entry_SYSCALL_64_fastpath+0x1f/0xbe
-> #2 (sb_writers){.+.+}:
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
__sb_start_write+0x18f/0x290 fs/super.c:1341
sb_start_write include/linux/fs.h:1541 [inline]
mnt_want_write+0x3f/0xb0 fs/namespace.c:387
filename_create+0x12b/0x520 fs/namei.c:3628
kern_path_create+0x33/0x40 fs/namei.c:3674
handle_create+0xc0/0x760 drivers/base/devtmpfs.c:203
-> #1 ((complete)&req.done){+.+.}:
check_prevs_add kernel/locking/lockdep.c:2020 [inline]
validate_chain kernel/locking/lockdep.c:2469 [inline]
__lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
complete_acquire include/linux/completion.h:39 [inline]
__wait_for_common kernel/sched/completion.c:108 [inline]
wait_for_common kernel/sched/completion.c:122 [inline]
wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143
devtmpfs_create_node+0x32b/0x4a0 drivers/base/devtmpfs.c:115
device_add+0x120f/0x1640 drivers/base/core.c:1824
device_create_groups_vargs+0x1f3/0x250 drivers/base/core.c:2430
device_create_vargs drivers/base/core.c:2470 [inline]
device_create+0xda/0x110 drivers/base/core.c:2506
vcs_make_sysfs+0x35/0x60 drivers/tty/vt/vc_screen.c:628
vc_allocate+0x4b7/0x6b0 drivers/tty/vt/vt.c:795
con_install+0x52/0x440 drivers/tty/vt/vt.c:2876
tty_driver_install_tty drivers/tty/tty_io.c:1214 [inline]
tty_init_dev+0xf6/0x4a0 drivers/tty/tty_io.c:1314
tty_open_by_driver drivers/tty/tty_io.c:1941 [inline]
tty_open+0x60f/0xac0 drivers/tty/tty_io.c:1989
chrdev_open+0x257/0x730 fs/char_dev.c:416
do_dentry_open+0x67f/0xd70 fs/open.c:752
vfs_open+0x107/0x230 fs/open.c:866
do_last fs/namei.c:3387 [inline]
path_openat+0x1157/0x3520 fs/namei.c:3527
do_filp_open+0x25b/0x3b0 fs/namei.c:3562
do_sys_open+0x502/0x6d0 fs/open.c:1059
SYSC_open fs/open.c:1077 [inline]
SyS_open+0x2d/0x40 fs/open.c:1072
entry_SYSCALL_64_fastpath+0x1f/0xbe
-> #0 (console_lock){+.+.}:
check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894
check_prevs_add kernel/locking/lockdep.c:2020 [inline]
validate_chain kernel/locking/lockdep.c:2469 [inline]
__lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
console_lock+0x4b/0x80 kernel/printk/printk.c:2047
vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:218
do_loop_readv_writev fs/read_write.c:693 [inline]
do_iter_read+0x3db/0x5b0 fs/read_write.c:917
vfs_readv+0x121/0x1c0 fs/read_write.c:979
kernel_readv fs/splice.c:361 [inline]
default_file_splice_read+0x508/0xae0 fs/splice.c:416
do_splice_to+0x110/0x170 fs/splice.c:880
do_splice fs/splice.c:1173 [inline]
SYSC_splice fs/splice.c:1402 [inline]
SyS_splice+0x11a8/0x1630 fs/splice.c:1382
entry_SYSCALL_64_fastpath+0x1f/0xbe
other info that might help us debug this:
Chain exists of:
console_lock --> sb_writers --> &pipe->mutex/1
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pipe->mutex/1);
lock(sb_writers);
lock(&pipe->mutex/1);
lock(console_lock);
*** DEADLOCK ***
1 lock held by syz-executor5/10329:
#0: (&pipe->mutex/1){+.+.}, at: [<ffffffff81ac0fa6>] pipe_lock_nested fs/pipe.c:66 [inline]
#0: (&pipe->mutex/1){+.+.}, at: [<ffffffff81ac0fa6>] pipe_lock+0x56/0x70 fs/pipe.c:74
stack backtrace:
CPU: 1 PID: 10329 Comm: syz-executor5 Not tainted 4.13.0-next-20170912+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_circular_bug+0x503/0x710 kernel/locking/lockdep.c:1259
check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894
check_prevs_add kernel/locking/lockdep.c:2020 [inline]
validate_chain kernel/locking/lockdep.c:2469 [inline]
__lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
console_lock+0x4b/0x80 kernel/printk/printk.c:2047
vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:218
do_loop_readv_writev fs/read_write.c:693 [inline]
do_iter_read+0x3db/0x5b0 fs/read_write.c:917
vfs_readv+0x121/0x1c0 fs/read_write.c:979
kernel_readv fs/splice.c:361 [inline]
default_file_splice_read+0x508/0xae0 fs/splice.c:416
do_splice_to+0x110/0x170 fs/splice.c:880
do_splice fs/splice.c:1173 [inline]
SYSC_splice fs/splice.c:1402 [inline]
SyS_splice+0x11a8/0x1630 fs/splice.c:1382
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f82a10a5c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 0000000000451e59
RDX: 000000000000001b RSI: 0000000000000000 RDI: 0000000000000017
RBP: 0000000000000082 R08: 000000005636d6e4 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b7397
R13: 00000000ffffffff R14: 00000000000000fb R15: fffffffffffffffc
TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
sctp: [Deprecated]: syz-executor2 (pid 10489) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
sctp: [Deprecated]: syz-executor2 (pid 10499) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
netlink: 5 bytes leftover after parsing attributes in process `syz-executor7'.
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns
QAT: Invalid ioctl
QAT: Invalid ioctl
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8 sclass=netlink_route_socket pig=10725 comm=syz-executor5
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8 sclass=netlink_route_socket pig=10725 comm=syz-executor5
QAT: Invalid ioctl
QAT: Invalid ioctl
PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex
PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex
kvm [10809]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8
kvm [10809]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8
netlink: 11 bytes leftover after parsing attributes in process `syz-executor3'.
nla_parse: 1 callbacks suppressed
netlink: 37 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 37 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 1 PID: 11839 Comm: syz-executor0 Not tainted 4.13.0-next-20170912+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
fail_dump lib/fault-inject.c:51 [inline]
should_fail+0x8c0/0xa40 lib/fault-inject.c:149
should_failslab+0xec/0x120 mm/failslab.c:31
slab_pre_alloc_hook mm/slab.h:422 [inline]
slab_alloc_node mm/slab.c:3304 [inline]
kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3649
__alloc_skb+0xf1/0x740 net/core/skbuff.c:194
alloc_skb include/linux/skbuff.h:976 [inline]
pfkey_sendmsg+0x20f/0x9f0 net/key/af_key.c:3635
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
sock_write_iter+0x320/0x5e0 net/socket.c:912
call_write_iter include/linux/fs.h:1770 [inline]
new_sync_write fs/read_write.c:468 [inline]
__vfs_write+0x68a/0x970 fs/read_write.c:481
vfs_write+0x18f/0x510 fs/read_write.c:543
SYSC_write fs/read_write.c:588 [inline]
SyS_write+0xef/0x220 fs/read_write.c:580
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f16d1783c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59
RDX: 0000000000000010 RSI: 000000002004b000 RDI: 0000000000000005
RBP: 00007f16d1783a10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b69f7
R13: 00007f16d1783b48 R14: 00000000004b6a07 R15: 0000000000000000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 11858 Comm: syz-executor3 Not tainted 4.13.0-next-20170912+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
fail_dump lib/fault-inject.c:51 [inline]
should_fail+0x8c0/0xa40 lib/fault-inject.c:149
should_failslab+0xec/0x120 mm/failslab.c:31
slab_pre_alloc_hook mm/slab.h:422 [inline]
slab_alloc_node mm/slab.c:3304 [inline]
kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3649
__alloc_skb+0xf1/0x740 net/core/skbuff.c:194
alloc_skb include/linux/skbuff.h:976 [inline]
pfkey_sendmsg+0x20f/0x9f0 net/key/af_key.c:3635
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
sock_write_iter+0x320/0x5e0 net/socket.c:912
call_write_iter include/linux/fs.h:1770 [inline]
new_sync_write fs/read_write.c:468 [inline]
__vfs_write+0x68a/0x970 fs/read_write.c:481
vfs_write+0x18f/0x510 fs/read_write.c:543
SYSC_write fs/read_write.c:588 [inline]
SyS_write+0xef/0x220 fs/read_write.c:580
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f4d12385c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59
RDX: 0000000000000010 RSI: 000000002004b000 RDI: 0000000000000005
RBP: 00007f4d12385a10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b69f7
R13: 00007f4d12385b48 R14: 00000000004b6a07 R15: 0000000000000000
netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'.
tc_dump_action: action bad kind
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'.
tc_dump_action: action bad kind
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12035 Comm: syz-executor7 Not tainted 4.13.0-next-20170912+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
fail_dump lib/fault-inject.c:51 [inline]
should_fail+0x8c0/0xa40 lib/fault-inject.c:149
should_failslab+0xec/0x120 mm/failslab.c:31
slab_pre_alloc_hook mm/slab.h:422 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3723 [inline]
__kmalloc+0x63/0x760 mm/slab.c:3734
kmalloc include/linux/slab.h:498 [inline]
sock_kmalloc+0x112/0x190 net/core/sock.c:1974
ipv6_sock_mc_join+0x506/0xa80 net/ipv6/mcast.c:158
do_ipv6_setsockopt.isra.12+0x2f11/0x35c0 net/ipv6/ipv6_sockglue.c:636
ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:913
udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1451
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2960
SYSC_setsockopt net/socket.c:1852 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1831
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f2c9de61c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59
RDX: 0000000000000014 RSI: 0000000000000029 RDI: 0000000000000005
RBP: 00007f2c9de61a10 R08: 0000000000000014 R09: 0000000000000000
R10: 0000000020599000 R11: 0000000000000216 R12: 00000000004b69f7
R13: 00007f2c9de61b48 R14: 00000000004b6a07 R15: 0000000000000000
nla_parse: 1 callbacks suppressed
netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'.