binder: 10089:10114 BC_FREE_BUFFER u0000000000000000 no match
======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc3+ #219 Not tainted
------------------------------------------------------
/dev/sg#/10145 is trying to acquire lock:
(&pipe->mutex/1){+.+.}, at: [<0000000007b35c80>] pipe_lock_nested fs/pipe.c:67 [inline]
(&pipe->mutex/1){+.+.}, at: [<0000000007b35c80>] pipe_lock+0x56/0x70 fs/pipe.c:75
but task is already holding lock:
(sb_writers){.+.+}, at: [<0000000080941f70>] file_start_write include/linux/fs.h:2715 [inline]
(sb_writers){.+.+}, at: [<0000000080941f70>] do_splice fs/splice.c:1146 [inline]
(sb_writers){.+.+}, at: [<0000000080941f70>] SYSC_splice fs/splice.c:1402 [inline]
(sb_writers){.+.+}, at: [<0000000080941f70>] SyS_splice+0x1117/0x1630 fs/splice.c:1382
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (sb_writers){.+.+}:
complete+0x18/0x80 kernel/sched/completion.c:35
devtmpfsd+0x29b/0x4b0 drivers/base/devtmpfs.c:401
kthread+0x37a/0x440 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441
0xffffffffffffffff
-> #5 ((completion)&req.done){+.+.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
complete_acquire include/linux/completion.h:40 [inline]
__wait_for_common kernel/sched/completion.c:109 [inline]
wait_for_common kernel/sched/completion.c:123 [inline]
wait_for_completion+0xcb/0x7b0 kernel/sched/completion.c:144
devtmpfs_create_node+0x32b/0x4a0 drivers/base/devtmpfs.c:115
device_add+0x120f/0x1640 drivers/base/core.c:1824
device_register+0x1d/0x20 drivers/base/core.c:1905
tty_register_device_attr+0x422/0x740 drivers/tty/tty_io.c:2956
tty_port_register_device_attr_serdev+0x100/0x140 drivers/tty/tty_port.c:166
uart_add_one_port+0xa7a/0x15b0 drivers/tty/serial/serial_core.c:2783
serial8250_register_8250_port+0xfac/0x1990 drivers/tty/serial/8250/8250_core.c:1045
serial_pnp_probe+0x5e7/0xac0 drivers/tty/serial/8250/8250_pnp.c:480
pnp_device_probe+0x15f/0x250 drivers/pnp/driver.c:109
really_probe drivers/base/dd.c:424 [inline]
driver_probe_device+0x71b/0xae0 drivers/base/dd.c:566
__driver_attach+0x181/0x1c0 drivers/base/dd.c:800
bus_for_each_dev+0x154/0x1e0 drivers/base/bus.c:313
driver_attach+0x3d/0x50 drivers/base/dd.c:819
bus_add_driver+0x466/0x620 drivers/base/bus.c:669
driver_register+0x1bf/0x3c0 drivers/base/driver.c:168
pnp_register_driver+0x75/0xa0 drivers/pnp/driver.c:272
serial8250_pnp_init+0x15/0x20 drivers/tty/serial/8250/8250_pnp.c:537
serial8250_init+0x8f/0x270 drivers/tty/serial/8250/8250_core.c:1122
do_one_initcall+0x9e/0x330 init/main.c:831
do_initcall_level init/main.c:897 [inline]
do_initcalls init/main.c:905 [inline]
do_basic_setup init/main.c:923 [inline]
kernel_init_freeable+0x469/0x521 init/main.c:1071
kernel_init+0x13/0x172 init/main.c:998
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441
-> #4 (&port->mutex){+.+.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
uart_set_termios+0x8f/0x5b0 drivers/tty/serial/serial_core.c:1416
tty_set_termios+0x6d4/0xa40 drivers/tty/tty_ioctl.c:334
set_termios+0x377/0x6b0 drivers/tty/tty_ioctl.c:414
tty_mode_ioctl+0x9fb/0xb10 drivers/tty/tty_ioctl.c:749
n_tty_ioctl_helper+0x40/0x360 drivers/tty/tty_ioctl.c:940
n_tty_ioctl+0x148/0x2d0 drivers/tty/n_tty.c:2435
tty_ioctl+0x32e/0x15f0 drivers/tty/tty_io.c:2638
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_fastpath+0x1f/0x96
-> #3 (&tty->termios_rwsem){++++}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
down_write+0x87/0x120 kernel/locking/rwsem.c:70
n_tty_flush_buffer+0x21/0x320 drivers/tty/n_tty.c:357
tty_buffer_flush+0x29a/0x390 drivers/tty/tty_buffer.c:233
tty_ldisc_flush+0x25/0x70 drivers/tty/tty_ldisc.c:418
tty_port_close_start.part.4+0x1cd/0x4e0 drivers/tty/tty_port.c:603
tty_port_close_start drivers/tty/tty_port.c:646 [inline]
tty_port_close+0x3f/0x80 drivers/tty/tty_port.c:640
uart_close+0x77/0x1d0 drivers/tty/serial/serial_core.c:1487
tty_release+0x446/0x14c0 drivers/tty/tty_io.c:1639
__fput+0x333/0x7f0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x94/0x96
-> #2 (&buf->lock){+.+.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
tty_buffer_flush+0xbd/0x390 drivers/tty/tty_buffer.c:222
tty_ldisc_flush+0x25/0x70 drivers/tty/tty_ldisc.c:418
tty_port_close_start.part.4+0x1cd/0x4e0 drivers/tty/tty_port.c:603
tty_port_close_start drivers/tty/tty_port.c:646 [inline]
tty_port_close+0x3f/0x80 drivers/tty/tty_port.c:640
uart_close+0x77/0x1d0 drivers/tty/serial/serial_core.c:1487
tty_release+0x446/0x14c0 drivers/tty/tty_io.c:1639
__fput+0x333/0x7f0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x94/0x96
-> #1 (&tty->ldisc_sem){++++}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__ldsem_down_read_nested+0xd1/0xa90 drivers/tty/tty_ldsem.c:325
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
tty_ldisc_ref_wait+0x25/0x80 drivers/tty/tty_ldisc.c:277
tty_read+0xf8/0x250 drivers/tty/tty_io.c:852
do_loop_readv_writev fs/read_write.c:673 [inline]
do_iter_read+0x3db/0x5b0 fs/read_write.c:897
vfs_readv+0x121/0x1c0 fs/read_write.c:959
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/0x96
-> #0 (&pipe->mutex/1){+.+.}:
check_prevs_add kernel/locking/lockdep.c:2031 [inline]
validate_chain kernel/locking/lockdep.c:2473 [inline]
__lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
pipe_lock_nested fs/pipe.c:67 [inline]
pipe_lock+0x56/0x70 fs/pipe.c:75
iter_file_splice_write+0x264/0xf30 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/0x96
other info that might help us debug this:
Chain exists of:
&pipe->mutex/1 --> (completion)&req.done --> sb_writers
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_writers);
lock((completion)&req.done);
lock(sb_writers);
lock(&pipe->mutex/1);
*** DEADLOCK ***
1 lock held by /dev/sg#/10145:
#0: (sb_writers){.+.+}, at: [<0000000080941f70>] file_start_write include/linux/fs.h:2715 [inline]
#0: (sb_writers){.+.+}, at: [<0000000080941f70>] do_splice fs/splice.c:1146 [inline]
#0: (sb_writers){.+.+}, at: [<0000000080941f70>] SYSC_splice fs/splice.c:1402 [inline]
#0: (sb_writers){.+.+}, at: [<0000000080941f70>] SyS_splice+0x1117/0x1630 fs/splice.c:1382
stack backtrace:
CPU: 0 PID: 10145 Comm: /dev/sg# Not tainted 4.15.0-rc3+ #219
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+0x194/0x257 lib/dump_stack.c:53
print_circular_bug+0x42d/0x610 kernel/locking/lockdep.c:1271
check_prev_add+0x666/0x15f0 kernel/locking/lockdep.c:1914
check_prevs_add kernel/locking/lockdep.c:2031 [inline]
validate_chain kernel/locking/lockdep.c:2473 [inline]
__lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
pipe_lock_nested fs/pipe.c:67 [inline]
pipe_lock+0x56/0x70 fs/pipe.c:75
iter_file_splice_write+0x264/0xf30 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/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f58b01f5c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000017 RSI: 0000000000000000 RDI: 0000000000000015
RBP: 00000000000003f2 R08: 00000000fffffdfb R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3f50
R13: 00000000ffffffff R14: 00007f58b01f66d4 R15: 0000000000000000
kauditd_printk_skb: 336 callbacks suppressed
audit: type=1400 audit(1513196495.712:1123): avc: denied { map } for pid=10170 comm="syz-executor2" path="pipe:[34280]" dev="pipefs" ino=34280 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=10221 comm=syz-executor3
device gre0 entered promiscuous mode
audit: type=1326 audit(1513196497.024:1124): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.054:1125): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=9 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.054:1126): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.057:1127): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=2 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.058:1128): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.060:1129): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=16 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.060:1130): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000
audit: type=1326 audit(1513196497.062:1131): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=2 compat=0 ip=0x40cd71 code=0x7ffc0000
audit: type=1326 audit(1513196497.063:1132): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10283 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008f data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008e data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008d data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008c data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008b data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008a data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000089 data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000088 data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000087 data 0xe0050031
kvm [10333]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000086 data 0xe0050031
nla_parse: 6 callbacks suppressed
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
rfkill: input handler disabled
rfkill: input handler enabled
binder: 10392:10403 ioctl 40106410 20926ff0 returned -22
binder: 10392:10403 ioctl ae03 2 returned -22
binder: BINDER_SET_CONTEXT_MGR already set
irq bypass consumer (token 0000000070d07553) registration fails: -16
binder: 10392:10424 ioctl 40046207 0 returned -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 10392:10397 ioctl 40046207 0 returned -16
binder: 10392:10397 ioctl 40106410 20926ff0 returned -22
binder: 10392:10397 ioctl ae03 2 returned -22
BUG: sleeping function called from invalid context at lib/usercopy.c:25
in_atomic(): 1, irqs_disabled(): 0, pid: 10586, name: syz-executor4
INFO: lockdep is turned off.
CPU: 1 PID: 10586 Comm: syz-executor4 Not tainted 4.15.0-rc3+ #219
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+0x194/0x257 lib/dump_stack.c:53
___might_sleep+0x2b2/0x470 kernel/sched/core.c:6060
__might_sleep+0x95/0x190 kernel/sched/core.c:6013
__might_fault+0xab/0x1d0 mm/memory.c:4525
_copy_to_user+0x2c/0xc0 lib/usercopy.c:25
copy_to_user include/linux/uaccess.h:155 [inline]
seq_read+0x875/0x13d0 fs/seq_file.c:212
proc_reg_read+0xef/0x170 fs/proc/inode.c:217
do_loop_readv_writev fs/read_write.c:673 [inline]
do_iter_read+0x3db/0x5b0 fs/read_write.c:897
vfs_readv+0x121/0x1c0 fs/read_write.c:959
do_preadv+0x11b/0x1a0 fs/read_write.c:1043
SYSC_preadv fs/read_write.c:1093 [inline]
SyS_preadv+0x30/0x40 fs/read_write.c:1088
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007fc038244c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007fc038245700 RCX: 0000000000452a39
RDX: 0000000000000002 RSI: 0000000020006000 RDI: 0000000000000013
RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000061 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007fc0382459c0 R15: 0000000000000002
WARNING: CPU: 1 PID: 10586 at lib/usercopy.c:26 _copy_to_user+0xb5/0xc0 lib/usercopy.c:26