======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc2+ #216 Not tainted
------------------------------------------------------
syz-executor7/8848 is trying to acquire lock:
(console_lock){+.+.}, at: [<000000001c8cd30e>] vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:219
but task is already holding lock:
(&pipe->mutex/1){+.+.}, at: [<00000000dd7fc330>] pipe_lock_nested fs/pipe.c:67 [inline]
(&pipe->mutex/1){+.+.}, at: [<00000000dd7fc330>] pipe_lock+0x56/0x70 fs/pipe.c:75
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&pipe->mutex/1){+.+.}:
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
-> #2 (sb_writers){.+.+}:
spin_lock include/linux/spinlock.h:315 [inline]
fast_dput fs/dcache.c:687 [inline]
dput.part.23+0x492/0x830 fs/dcache.c:794
dput+0x1f/0x30 fs/dcache.c:787
path_put fs/namei.c:500 [inline]
done_path_create+0xad/0x110 fs/namei.c:3676
handle_create+0x196/0x760 drivers/base/devtmpfs.c:226
handle drivers/base/devtmpfs.c:373 [inline]
devtmpfsd+0x3b4/0x4b0 drivers/base/devtmpfs.c:399
-> #1 ((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_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:629
vc_allocate+0x4b7/0x6b0 drivers/tty/vt/vt.c:797
con_install+0x52/0x440 drivers/tty/vt/vt.c:2876
tty_driver_install_tty drivers/tty/tty_io.c:1215 [inline]
tty_init_dev+0xf6/0x4a0 drivers/tty/tty_io.c:1315
tty_open_by_driver drivers/tty/tty_io.c:1942 [inline]
tty_open+0x608/0xab0 drivers/tty/tty_io.c:1990
chrdev_open+0x257/0x730 fs/char_dev.c:417
do_dentry_open+0x682/0xd70 fs/open.c:752
vfs_open+0x107/0x230 fs/open.c:866
do_last fs/namei.c:3379 [inline]
path_openat+0x1157/0x3530 fs/namei.c:3519
do_filp_open+0x25b/0x3b0 fs/namei.c:3554
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/0x96
-> #0 (console_lock){+.+.}:
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
console_lock+0x4b/0x80 kernel/printk/printk.c:2047
vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:219
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
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-executor7/8848:
#0: (&pipe->mutex/1){+.+.}, at: [<00000000dd7fc330>] pipe_lock_nested fs/pipe.c:67 [inline]
#0: (&pipe->mutex/1){+.+.}, at: [<00000000dd7fc330>] pipe_lock+0x56/0x70 fs/pipe.c:75
stack backtrace:
CPU: 0 PID: 8848 Comm: syz-executor7 Not tainted 4.15.0-rc2+ #216
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
console_lock+0x4b/0x80 kernel/printk/printk.c:2047
vcs_read+0x129/0xae0 drivers/tty/vt/vc_screen.c:219
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
RIP: 0033:0x452a39
RSP: 002b:00007f2d70f0ac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000018 RSI: 0000000000000000 RDI: 0000000000000016
RBP: 0000000000000307 R08: 0000000000000058 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2948
R13: 00000000ffffffff R14: 00007f2d70f0b6d4 R15: 0000000000000000
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
device lo left promiscuous mode
netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 'syz-executor7': attribute type 29 has an invalid length.
netlink: 'syz-executor7': attribute type 29 has an invalid length.
device gre0 entered promiscuous mode
device syz0 entered promiscuous mode
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
irq bypass consumer (token 0000000009675d4e) registration fails: -16
kauditd_printk_skb: 114 callbacks suppressed
audit: type=1400 audit(1512947808.748:693): avc: denied { map_create } for pid=9644 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
device lo entered promiscuous mode
device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
nla_parse: 16 callbacks suppressed
netlink: 9 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 9 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'.
netlink: 'syz-executor4': attribute type 29 has an invalid length.
netlink: 5 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 'syz-executor4': attribute type 29 has an invalid length.
netlink: 5 bytes leftover after parsing attributes in process `syz-executor4'.
sock: process `syz-executor2' is using obsolete setsockopt SO_BSDCOMPAT
audit: type=1400 audit(1512947810.739:694): avc: denied { attach_queue } for pid=10006 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=tun_socket permissive=1
netlink: 10 bytes leftover after parsing attributes in process `syz-executor7'.
binder: release 10006:10009 transaction 49 out, still active
binder: undelivered TRANSACTION_COMPLETE
binder: BINDER_SET_CONTEXT_MGR already set
binder: 10006:10009 ioctl 40046207 0 returned -16
binder_alloc: 10006: binder_alloc_buf, no vma
binder: 10006:10009 transaction failed 29189/-3, size 0-0 line 2890
binder: undelivered TRANSACTION_ERROR: 29189
netlink: 10 bytes leftover after parsing attributes in process `syz-executor7'.
binder: send failed reply for transaction 49, target dead
QAT: Invalid ioctl
QAT: Invalid ioctl
irq bypass consumer (token 0000000071bd6832) registration fails: -16
irq bypass consumer (token 0000000096d99cac) registration fails: -16
loop_reread_partitions: partition scan of loop0 (-\t@r9hx GQ:[il
L*@R-Tr-x) failed (rc=-13)
kvm_pmu: event creation failed -2
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=65531 sclass=netlink_xfrm_socket pig=10204 comm=syz-executor5
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=65531 sclass=netlink_xfrm_socket pig=10204 comm=syz-executor5
binder: 10355:10360 ioctl 40046205 0 returned -22
binder: 10355:10360 ioctl 40046205 4000000000000006 returned -22
binder: 10355:10376 ioctl 40046205 0 returned -22
binder: 10382:10383 BC_CLEAR_DEATH_NOTIFICATION death notification not active
binder: 10382:10383 BC_DEAD_BINDER_DONE 0000000000000000 not found
binder: 10382:10383 got reply transaction with no transaction stack
binder: 10382:10383 transaction failed 29201/-71, size 0-16 line 2690
binder: 10382:10383 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0
device gre0 entered promiscuous mode
binder: 10382:10383 Acquire 1 refcount change on invalid ref 0 ret -22
binder: 10382:10383 BC_DEAD_BINDER_DONE 0000000000000000 not found
binder: 10382:10383 Release 1 refcount change on invalid ref 0 ret -22
binder: 10382:10383 got reply transaction with no transaction stack
binder: 10382:10383 transaction failed 29201/-71, size 0-16 line 2690
binder: undelivered TRANSACTION_ERROR: 29201
binder: undelivered TRANSACTION_ERROR: 29201
device gre0 entered promiscuous mode
binder: 10435:10436 got transaction with invalid offset (40, min 0 max 80) or object.
binder: 10435:10436 transaction failed 29201/-22, size 80-8 line 2953
binder: BINDER_SET_CONTEXT_MGR already set
binder: 10435:10436 ioctl 40046207 0 returned -16
binder: binder_mmap: 10435 204c6000-204c7000 bad vm_flags failed -1
audit: type=1400 audit(1512947812.540:695): avc: denied { setattr } for pid=10420 comm="syz-executor7" name="exec" dev="proc" ino=35099 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=file permissive=1
binder_alloc: binder_alloc_mmap_handler: 10435 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 10435:10436 ioctl 40046207 0 returned -16
binder_alloc: 10435: binder_alloc_buf, no vma
binder: 10435:10443 transaction failed 29189/-3, size 80-8 line 2890
binder: BINDER_SET_CONTEXT_MGR already set
binder: 10435:10436 ioctl 40046207 0 returned -16
binder: binder_mmap: 10435 204c6000-204c7000 bad vm_flags failed -1
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29201
netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'.
sctp: [Deprecated]: syz-executor5 (pid 10480) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
sctp: [Deprecated]: syz-executor5 (pid 10488) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
binder: 10494:10498 ioctl 40046205 6 returned -22
QAT: Invalid ioctl
binder: 10494:10506 ioctl c0306201 20008fd0 returned -14
sctp: [Deprecated]: syz-executor5 (pid 10518) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
QAT: Invalid ioctl
binder: 10532:10533 ioctl 40286608 800004 returned -22
binder: 10532:10533 ioctl 40046205 3 returned -22
binder: 10532:10533 ioctl 40046205 3 returned -22
sctp: [Deprecated]: syz-executor5 (pid 10539) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
binder: 10532:10548 ERROR: BC_REGISTER_LOOPER called without request
binder: 10548 RLIMIT_NICE not set
binder: 10548 RLIMIT_NICE not set
binder: 10532:10533 got reply transaction with no transaction stack
audit: type=1400 audit(1512947813.048:696): avc: denied { map_read map_write } for pid=10559 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
binder: 10532:10548 Release 1 refcount change on invalid ref 1 ret -22
binder: 10532:10548 got transaction to invalid handle
binder: 10532:10548 transaction failed 29201/-22, size 24-32 line 2775
binder: 10532:10548 ioctl 40046205 7098 returned -22
binder: 10532:10548 got transaction to invalid handle
binder: 10532:10548 transaction failed 29201/-22, size 0-40 line 2775
binder: 10532:10533 transaction failed 29201/-71, size 32-8 line 2690
binder: 10532:10557 ioctl 40286608 800004 returned -22
binder: 10532:10548 ioctl 40046205 3 returned -22
binder: 10532:10557 ioctl 40046205 3 returned -22
QAT: Invalid ioctl
binder: undelivered TRANSACTION_ERROR: 29201
binder: 10532:10533 ERROR: BC_REGISTER_LOOPER called without request
binder: 10533 RLIMIT_NICE not set
QAT: Invalid ioctl
binder: 10533 RLIMIT_NICE not set
binder: 10532:10548 got reply transaction with bad transaction stack, transaction 66 has target 10532:10533
binder: 10532:10548 transaction failed 29201/-71, size 32-8 line 2705
binder: 10532:10548 Release 1 refcount change on invalid ref 1 ret -22
binder: 10532:10548 got transaction to invalid handle
binder: 10532:10548 transaction failed 29201/-22, size 24-32 line 2775
QAT: Invalid ioctl
binder: 10532:10533 ioctl 40046205 7098 returned -22
QAT: Invalid ioctl
binder: release 10532:10548 transaction 61 in, still active
binder: send failed reply for transaction 61 to 10532:10557
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29189
binder: release 10532:10533 transaction 66 in, still active
binder: send failed reply for transaction 66 to 10532:10548
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29201
binder: undelivered TRANSACTION_ERROR: 29189
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=10805 comm=syz-executor2
QAT: Invalid ioctl
QAT: Invalid ioctl
audit: type=1400 audit(1512947814.237:697): avc: denied { map } for pid=10927 comm="syz-executor0" path="/proc/853/net/fib_triestat" dev="proc" ino=4026532320 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=1
audit: type=1400 audit(1512947814.273:698): avc: denied { map } for pid=10931 comm="syz-executor5" path="socket:[35610]" dev="sockfs" ino=35610 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_route_socket permissive=1
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 1 PID: 10949 Comm: syz-executor2 Not tainted 4.15.0-rc2+ #216
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
handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
do_anonymous_page mm/memory.c:3121 [inline]
handle_pte_fault mm/memory.c:3934 [inline]
__handle_mm_fault+0x353a/0x3e20 mm/memory.c:4060
handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
__do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421
RSP: 0018:ffff8801cef7f928 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff8250b3a1
RDX: 00000000000000c3 RSI: ffffc90002d2f000 RDI: ffff8801cef7fd28
RBP: ffff8801cef7fa08 R08: 1ffff1003b326c6a R09: 1ffff10039deff1a
R10: ffff8801d2f9c1c0 R11: 0000000000000000 R12: 1ffff10039deff28
R13: ffff8801cef7f9e0 R14: 0000000000000000 R15: ffff8801cef7fd20
generic_perform_write+0x200/0x600 mm/filemap.c:3129
__generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3264
generic_file_write_iter+0x399/0x7a0 mm/filemap.c:3292
call_write_iter include/linux/fs.h:1772 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x68a/0x970 fs/read_write.c:482
vfs_write+0x18f/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f73f5a43c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3728
R13: 00000000ffffffff R14: 00007f73f5a446d4 R15: 0000000000000000