====================================================== WARNING: possible circular locking dependency detected 4.14.0-next-20171124+ #51 Not tainted ------------------------------------------------------ syz-executor5/9357 is trying to acquire lock: (console_lock){+.+.}, at: [] vcs_write+0x14d/0xca0 drivers/tty/vt/vc_screen.c:397 but task is already holding lock: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] (&pipe->mutex/1){+.+.}, at: [] 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] fsnotify_detach_mark+0x152/0x5c0 fs/notify/mark.c:341 -> #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:3388 [inline] path_openat+0x1157/0x3530 fs/namei.c:3528 do_filp_open+0x25b/0x3b0 fs/namei.c:3563 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_write+0x14d/0xca0 drivers/tty/vt/vc_screen.c:397 __vfs_write+0xef/0x970 fs/read_write.c:480 __kernel_write+0xfe/0x350 fs/read_write.c:501 write_pipe_buf+0x175/0x220 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x328/0x730 fs/splice.c:626 splice_from_pipe+0x1e9/0x330 fs/splice.c:661 default_file_splice_write+0x40/0x90 fs/splice.c:809 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: 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-executor5/9357: #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x56/0x70 fs/pipe.c:75 stack backtrace: CPU: 0 PID: 9357 Comm: syz-executor5 Not tainted 4.14.0-next-20171124+ #51 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_write+0x14d/0xca0 drivers/tty/vt/vc_screen.c:397 __vfs_write+0xef/0x970 fs/read_write.c:480 __kernel_write+0xfe/0x350 fs/read_write.c:501 write_pipe_buf+0x175/0x220 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x328/0x730 fs/splice.c:626 splice_from_pipe+0x1e9/0x330 fs/splice.c:661 default_file_splice_write+0x40/0x90 fs/splice.c:809 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: 0033:0x452879 RSP: 002b:00007f2c4c36dbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000000013 RSI: 0000000000000000 RDI: 0000000000000014 RBP: 0000000000000086 R08: 00000000fffff5fc R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f5fc8 R13: 00000000ffffffff R14: 00007f2c4c36e6d4 R15: 0000000000000000 sctp: [Deprecated]: syz-executor3 (pid 9369) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead semctl(GETNCNT/GETZCNT) is since 3.16 Single Unix Specification compliant. The task syz-executor5 (9494) triggered the difference, watch for misbehavior. QAT: Invalid ioctl QAT: Invalid ioctl dccp_invalid_packet: pskb_may_pull failed dccp_invalid_packet: pskb_may_pull failed Bearer <> rejected, not supported in standalone mode Bearer <> rejected, not supported in standalone mode device gre0 entered promiscuous mode kauditd_printk_skb: 164 callbacks suppressed audit: type=1326 audit(1511736647.439:1445): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.439:1446): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.459:1447): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=54 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.459:1448): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.459:1449): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.459:1450): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=16 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.460:1451): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.460:1452): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.462:1453): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=121 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736647.462:1454): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9588 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 kvm: pic: level sensitive irq not supported dccp_invalid_packet: P.Data Offset(4) too small dccp_invalid_packet: P.Data Offset(4) too small device gre0 entered promiscuous mode RDS: rds_bind could not find a transport for 172.20.7.170, load rds_tcp or rds_rdma? Bearer <> rejected, not supported in standalone mode rfkill: input handler disabled rfkill: input handler enabled nla_parse: 17 callbacks suppressed netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'. device gre0 entered promiscuous mode device gre0 left promiscuous mode device gre0 entered promiscuous mode device gre0 entered promiscuous mode sg_write: data in/out 45116/228 bytes for SCSI command 0x0-- guessing data in; program syz-executor4 not setting count and/or reply_len properly device gre0 entered promiscuous mode sg_write: data in/out 45116/228 bytes for SCSI command 0x0-- guessing data in; program syz-executor4 not setting count and/or reply_len properly device gre0 entered promiscuous mode syz7: renamed from lo device gre0 entered promiscuous mode selinux_nlmsg_perm: 1 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=32050 sclass=netlink_route_socket pig=10216 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=32050 sclass=netlink_route_socket pig=10216 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3061 sclass=netlink_route_socket pig=10270 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3061 sclass=netlink_route_socket pig=10277 comm=syz-executor3 rfkill: input handler disabled rfkill: input handler enabled device gre0 entered promiscuous mode netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 25 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 25 bytes leftover after parsing attributes in process `syz-executor7'. dccp_close: ABORT with 95 bytes unread kvm: vcpu 0: requested 4 ns lapic timer period limited to 500000 ns device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=28371 sclass=netlink_route_socket pig=10636 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=28371 sclass=netlink_route_socket pig=10636 comm=syz-executor3 device eql entered promiscuous mode device eql entered promiscuous mode futex_wake_op: syz-executor3 tries to shift op by 4095; fix this program futex_wake_op: syz-executor3 tries to shift op by 4095; fix this program QAT: Invalid ioctl netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl rfkill: input handler disabled rfkill: input handler enabled kauditd_printk_skb: 73 callbacks suppressed audit: type=1326 audit(1511736653.671:1528): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.671:1529): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1530): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=29 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1531): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1532): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1533): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=55 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1534): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1535): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1536): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=257 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511736653.678:1537): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=11065 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl ?: renamed from sit0 *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x000000000000fffa RIP = 0x0000000000000000 RFLAGS=0x00023000 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 DS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GDTR: limit=0x0000ffff, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000 IDTR: limit=0x0000ffff, base=0x0000000000000000 TR: sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811be573 RSP = 0xffff8801c71674c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007fd145089700 GSBase=ffff8801db400000 TRBase=ffff8801db423140 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001d8a64000 CR4=00000000001426f0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff85143e70 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=00000042 EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffb372ab2aa5 EPT pointer = 0x00000001d46a601e netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. device gre0 entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00023002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 DS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GDTR: limit=0x000007ff, base=0x0000000000001000 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 IDTR: limit=0x0000ffff, base=0x0000000000000000 TR: sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000 EFER = 0x0000000000002000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811be573 RSP = 0xffff8801d86f74c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f8b2ffe0700 GSBase=ffff8801db500000 TRBase=ffff8801db423140 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001c9a7c000 CR4=00000000001426e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff85143e70 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=0000004b EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffb3742559d9 TPR Threshold = 0x00 EPT pointer = 0x00000001c582a01e SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5 sclass=netlink_route_socket pig=11321 comm=syz-executor6 device gre0 entered promiscuous mode device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5 sclass=netlink_route_socket pig=11321 comm=syz-executor6 device gre0 entered promiscuous mode netlink: 17 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor2'. device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready netlink: 2 bytes leftover after parsing attributes in process `syz-executor5'.