======================================================
device gre0 entered promiscuous mode
WARNING: possible circular locking dependency detected
4.15.0-rc2-mm1+ #39 Not tainted
------------------------------------------------------
keyring/vboxnet/6381 is trying to acquire lock:
 (&pipe->mutex/1){+.+.}, at: [<00000000656807e2>] pipe_lock_nested fs/pipe.c:67 [inline]
 (&pipe->mutex/1){+.+.}, at: [<00000000656807e2>] pipe_lock+0x56/0x70 fs/pipe.c:75

but task is already holding lock:
 (sb_writers){.+.+}, at: [<00000000381cafa0>] file_start_write include/linux/fs.h:2719 [inline]
 (sb_writers){.+.+}, at: [<00000000381cafa0>] do_splice fs/splice.c:1146 [inline]
 (sb_writers){.+.+}, at: [<00000000381cafa0>] SYSC_splice fs/splice.c:1402 [inline]
 (sb_writers){.+.+}, at: [<00000000381cafa0>] 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){.+.+}:
       spin_lock include/linux/spinlock.h:315 [inline]
       devtmpfsd+0x224/0x4b0 drivers/base/devtmpfs.c:392
       kthread+0x37a/0x440 kernel/kthread.c:238
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
       0xffffffffffffffff
       handle drivers/base/devtmpfs.c:375 [inline]
       devtmpfsd+0x262/0x4b0 drivers/base/devtmpfs.c:399

-> #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/0x15a0 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:833
       do_initcall_level init/main.c:899 [inline]
       do_initcalls init/main.c:907 [inline]
       do_basic_setup init/main.c:925 [inline]
       kernel_init_freeable+0x469/0x521 init/main.c:1073
       kernel_init+0x13/0x172 init/main.c:1000
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

-> #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/0x1600 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+0x275/0x2f0 arch/x86/entry/common.c:165
       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+0x275/0x2f0 arch/x86/entry/common.c:165
       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 keyring/vboxnet/6381:
 #0:  (sb_writers){.+.+}, at: [<00000000381cafa0>] file_start_write include/linux/fs.h:2719 [inline]
 #0:  (sb_writers){.+.+}, at: [<00000000381cafa0>] do_splice fs/splice.c:1146 [inline]
 #0:  (sb_writers){.+.+}, at: [<00000000381cafa0>] SYSC_splice fs/splice.c:1402 [inline]
 #0:  (sb_writers){.+.+}, at: [<00000000381cafa0>] SyS_splice+0x1117/0x1630 fs/splice.c:1382

stack backtrace:
CPU: 0 PID: 6381 Comm: keyring/vboxnet Not tainted 4.15.0-rc2-mm1+ #39
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: 0033:0x452a09
RSP: 002b:00007fb7e5d90c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000017 RSI: 0000000000000000 RDI: 0000000000000015
RBP: 0000000000000403 R08: 00000010fffffdf8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f30e8
R13: 00000000ffffffff R14: 00007fb7e5d916d4 R15: 0000000000000000
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
netlink: 25 bytes leftover after parsing attributes in process `syz-executor1'.
kvm [6403]: vcpu1, guest rIP: 0xfff0 Hyper-V uhandled wrmsr: 0x40000020 data 0x0
netlink: 25 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 25 bytes leftover after parsing attributes in process `syz-executor3'.
kvm [6403]: vcpu1, guest rIP: 0xfff0 Hyper-V uhandled wrmsr: 0x40000020 data 0x0
QAT: Invalid ioctl
device lo entered promiscuous mode
IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready
QAT: Invalid ioctl
binder: 6628:6631 Acquire 1 refcount change on invalid ref 4 ret -22
binder: 6628:6649 Acquire 1 refcount change on invalid ref 4 ret -22
nla_parse: 4 callbacks suppressed
netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 25 bytes leftover after parsing attributes in process `syz-executor5'.
binder: 6702:6705 ioctl 894b 204ca000 returned -22
binder: 6702:6705 ERROR: BC_REGISTER_LOOPER called without request
binder: 6705 RLIMIT_NICE not set
netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'.
binder: 6702:6709 DecRefs 0 refcount change on invalid ref 3 ret -22
binder: 6702:6709 BC_DEAD_BINDER_DONE 0000000000000004 not found
binder: 6702:6709 got reply transaction with no transaction stack
binder: 6702:6709 transaction failed 29201/-71, size 72-72 line 2747
binder: 6702:6709 got reply transaction with no transaction stack
binder: 6702:6709 transaction failed 29201/-71, size 24-8 line 2747
netlink: 25 bytes leftover after parsing attributes in process `syz-executor5'.
binder: 6702:6737 ioctl 894b 204ca000 returned -22
binder: 6702:6737 ERROR: BC_REGISTER_LOOPER called without request
binder: 6737 RLIMIT_NICE not set
binder: BINDER_SET_CONTEXT_MGR already set
binder: 6702:6709 ioctl 40046207 0 returned -16
netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'.
binder: 6702:6709 DecRefs 0 refcount change on invalid ref 3 ret -22
binder: 6702:6709 BC_DEAD_BINDER_DONE 0000000000000004 not found
binder: 6702:6709 got reply transaction with no transaction stack
binder: 6702:6709 transaction failed 29201/-71, size 72-72 line 2747
binder: undelivered TRANSACTION_ERROR: 29201
binder: 6752:6754 BC_FREE_BUFFER uffffffffffffffff no match
binder: 6752:6754 BC_FREE_BUFFER uffffffffffffffff no match

: renamed from syz6
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
sctp: [Deprecated]: syz-executor5 (pid 6852) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
netlink: 9 bytes leftover after parsing attributes in process `syz-executor6'.
netlink: 9 bytes leftover after parsing attributes in process `syz-executor6'.
device lo entered promiscuous mode
netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'.
sctp: [Deprecated]: syz-executor5 (pid 6870) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
9pnet_virtio: no channels available for device H
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9pnet_virtio: no channels available for device H
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sctp: [Deprecated]: syz-executor5 (pid 6951) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
sctp: [Deprecated]: syz-executor5 (pid 6958) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
kauditd_printk_skb: 399 callbacks suppressed
audit: type=1400 audit(1513590955.039:943): avc:  denied  { create } for  pid=6975 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1
9pnet_virtio: no channels available for device H
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9pnet_virtio: no channels available for device H
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device lo entered promiscuous mode
IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready
pit: kvm: requested 5866 ns i8254 timer period limited to 500000 ns
pit: kvm: requested 5866 ns i8254 timer period limited to 500000 ns
audit: type=1400 audit(1513590955.621:944): avc:  denied  { create } for  pid=7074 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_rdma_socket permissive=1
audit: type=1401 audit(1513590955.787:945): op=fscreate invalid_context=78A132C08A0DA4642780EE34B760D30EBD884CE2740F7C7C77E7CDA09B47D58B827043C7ECFC96D0B68F3D692A41C49D485B42A2C18C8840EC9D137C8ED48BB0317EC3C23A5D4EA8CEB479B51F88CCB27E3F34FE8FF0C515D70321B2A4187D5E2AD14D90468DD8E1AC6776FF4BAF8C392AF0376565266F6C64A9470B599E5E6332E392E413FF848D5BA2EB7491BC76BA68E3AE004FBB78E5EE390638D772027C22E25ED7E4BF5DA747227C1A4DA9D807B39530A5209EE759017AA6E589BF33B1E7BE7C38F29F74E7F48B8F59B8BC9C44EE66
rpcbind: RPC call returned error 22
rpcbind: RPC call returned error 22
binder: 7271:7277 ioctl c0306201 20009fd0 returned -11
binder: 7271:7277 DecRefs 0 refcount change on invalid ref 0 ret -22
binder: 7271:7277 unknown command 0
binder: 7271:7277 ioctl c0306201 20004000 returned -22
binder: 7271:7289 ioctl c0306201 20009fd0 returned -11
binder: 7271:7289 DecRefs 0 refcount change on invalid ref 0 ret -22
binder: 7271:7289 unknown command 0
binder: BINDER_SET_CONTEXT_MGR already set
binder: 7271:7309 ioctl 40046207 0 returned -16
binder_alloc: 7271: binder_alloc_buf, no vma
binder: 7271:7309 transaction failed 29189/-3, size 0-0 line 2947
binder: 7271:7289 ioctl c0306201 20004000 returned -22
binder: undelivered transaction 64, process died.
binder_alloc: binder_alloc_mmap_handler: 7489 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 7489:7491 ioctl 40046207 0 returned -16
audit: type=1400 audit(1513590957.357:946): avc:  denied  { map } for  pid=7546 comm="syz-executor6" path="/dev/input/event1" dev="devtmpfs" ino=8889 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:event_device_t:s0 tclass=chr_file permissive=1
QAT: Invalid ioctl
QAT: Invalid ioctl
device gre0 entered promiscuous mode
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=7652 comm=syz-executor0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 7854 Comm: syz-executor0 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76
RSP: 0018:ffff8801c9e97058 EFLAGS: 00010093
RAX: ffff8801d6286440 RBX: 00000000001606f0 RCX: ffffffff811a2d22
RDX: 0000000000000000 RSI: 1ffff100393d2e05 RDI: 00000000001606f0
RBP: ffff8801c9e97058 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801c9e96fc8 R11: 0000000000000000 R12: 0000000000000093
R13: ffff8801db21a0f0 R14: ffff8801db21a130 R15: ffff8801db21a130
FS:  00007fc6fb82a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d2f0556d50 CR3: 0000000006225005 CR4: 00000000001626f0
Call Trace:
 __write_cr4 arch/x86/include/asm/paravirt.h:76 [inline]
 __cr4_set arch/x86/include/asm/tlbflush.h:252 [inline]
 cr4_clear_bits arch/x86/include/asm/tlbflush.h:275 [inline]
 kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3582 [inline]
 hardware_disable+0x34a/0x4b0 arch/x86/kvm/vmx.c:3588
 kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:7969
 hardware_disable_nolock+0x30/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3283
 on_each_cpu+0xca/0x1b0 kernel/smp.c:604
 hardware_disable_all_nolock+0x3e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3301
 hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3307 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 [inline]
 kvm_put_kvm+0x956/0xde0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:747
 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:758
 __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
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ae0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16c0 kernel/signal.c:2337
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:161
 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
RIP: 0033:0x452a09
RSP: 002b:00007fc6fb829ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bf80 RCX: 0000000000452a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 000000000071bf80 R08: 00000000000001ba R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a2f7ff R14: 00007fc6fb82a9c0 R15: 000000000000001a
Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d 
RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76 RSP: ffff8801c9e97058
---[ end trace 8b3e26ac9915c9b7 ]---