====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ syz-executor3/3636 is trying to acquire lock: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:126 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [] flush_all_backlogs net/core/dev.c:4592 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (rtnl_mutex){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 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 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 addrconf_dad_work+0xbb/0xfc0 net/ipv6/addrconf.c:3890 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #2 ((&(&ifa->dad_work)->work)){+.+.}: process_one_work+0xba5/0x1be0 kernel/workqueue.c:2095 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 0xffffffffffffffff -> #1 ((complete)&rcu.completion){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 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 __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline] synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974 quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327 kasan_cache_shrink+0x9/0x10 mm/kasan/kasan.c:380 kmem_cache_shrink+0x15/0x30 mm/slab_common.c:857 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1560 acpi_purge_cached_objects+0x38/0xc9 drivers/acpi/acpica/utxface.c:271 acpi_initialize_objects+0xc5/0x112 drivers/acpi/acpica/utxfinit.c:302 acpi_bus_init drivers/acpi/bus.c:1131 [inline] acpi_init+0x23c/0x8e6 drivers/acpi/bus.c:1220 do_one_initcall+0x9e/0x330 init/main.c:826 do_initcall_level init/main.c:892 [inline] do_initcalls init/main.c:900 [inline] do_basic_setup init/main.c:918 [inline] kernel_init_freeable+0x469/0x521 init/main.c:1066 kernel_init+0x13/0x172 init/main.c:993 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #0 (cpu_hotplug_lock.rw_sem){++++}: 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+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline] percpu_down_read include/linux/percpu-rwsem.h:58 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:218 get_online_cpus include/linux/cpu.h:126 [inline] flush_all_backlogs net/core/dev.c:4592 [inline] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 rollback_registered+0x1be/0x3c0 net/core/dev.c:7183 unregister_netdevice_queue+0x2e3/0x5d0 net/core/dev.c:8171 unregister_netdevice include/linux/netdevice.h:2428 [inline] __tun_detach+0x1020/0x1390 drivers/net/tun.c:576 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2595 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe other info that might help us debug this: Chain exists of: cpu_hotplug_lock.rw_sem --> (&(&ifa->dad_work)->work) --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock((&(&ifa->dad_work)->work)); lock(rtnl_mutex); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor3/3636: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 stack backtrace: CPU: 1 PID: 3636 Comm: syz-executor3 Not tainted 4.13.0-rc6-next-20170825+ #9 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+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline] percpu_down_read include/linux/percpu-rwsem.h:58 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:218 get_online_cpus include/linux/cpu.h:126 [inline] flush_all_backlogs net/core/dev.c:4592 [inline] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 rollback_registered+0x1be/0x3c0 net/core/dev.c:7183 unregister_netdevice_queue+0x2e3/0x5d0 net/core/dev.c:8171 unregister_netdevice include/linux/netdevice.h:2428 [inline] __tun_detach+0x1020/0x1390 drivers/net/tun.c:576 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2595 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe RIP: 0033:0x4512e9 RSP: 002b:00007f7518535cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 0000000000718020 RCX: 00000000004512e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718020 RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000a6f7ef R14: 00007f75185369c0 R15: 0000000000000000 netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable syz-executor7 uses obsolete (PF_INET,SOCK_PACKET) ptm ptm1: ldisc open failed (-12), clearing slot 1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20001. Sending cookies. Check SNMP counters. rpcbind: RPC call returned error 22 raw_sendmsg: syz-executor7 forgot to set AF_INET. Fix it! rpcbind: RPC call returned error 22 program syz-executor2 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 program syz-executor2 is using a deprecated SCSI ioctl, please convert it to SG_IO program syz-executor2 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 program syz-executor2 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 QAT: Invalid ioctl sctp: [Deprecated]: syz-executor2 (pid 3991) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 3999) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 3991) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 3991) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead mmap: syz-executor6 (4072) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. QAT: Invalid ioctl nla_parse: 7 callbacks suppressed netlink: 13 bytes leftover after parsing attributes in process `syz-executor1'. QAT: Invalid ioctl netlink: 13 bytes leftover after parsing attributes in process `syz-executor1'. capability: warning: `syz-executor1' uses 32-bit capabilities (legacy support in use) netlink: 64 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 64 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4327 comm=syz-executor7 audit: type=1326 audit(1503912379.320:4): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4354 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1326 audit(1503912379.345:5): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4354 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=35 compat=0 ip=0x47c951 code=0xffff0000 netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. sctp: [Deprecated]: syz-executor0 (pid 4464) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor0 (pid 4464) Use of int in max_burst socket option. Use struct sctp_assoc_value instead audit: type=1326 audit(1503912380.105:6): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4512 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503912380.131:7): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4515 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503912380.160:8): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4512 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503912380.310:9): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4561 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 kvm [4549]: vcpu0, guest rIP: 0xfff0 ignored wrmsr: 0x11e data 0x7ff kvm [4549]: vcpu0, guest rIP: 0xfff0 ignored wrmsr: 0x11e data 0x7ff audit: type=1326 audit(1503912380.392:10): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4561 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503912380.488:11): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4595 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 dccp_invalid_packet: P.Data Offset(172) too large audit: type=1326 audit(1503912380.539:12): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4628 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4642 comm=syz-executor1 audit: type=1326 audit(1503912380.620:13): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4595 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 dccp_invalid_packet: P.Data Offset(172) too large QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4767 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4767 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4782 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4819 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4789 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4819 comm=syz-executor5 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl SELinux: failure in selinux_parse_skb(), unable to parse packet QAT: Invalid ioctl QAT: Invalid ioctl 8021q: VLANs not supported on lo 8021q: VLANs not supported on lo irq bypass consumer (token ffff8801c9b7ba80) registration fails: -16 nla_parse: 22 callbacks suppressed netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. irq bypass consumer (token ffff8801c389e600) registration fails: -16 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=256 sclass=netlink_route_socket pig=5739 comm=syz-executor1 netlink: 5 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=256 sclass=netlink_route_socket pig=5748 comm=syz-executor1 dccp_invalid_packet: pskb_may_pull failed netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. sit0: Invalid MTU 16711680 requested, hw max 65508 netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. dccp_invalid_packet: pskb_may_pull failed sit0: Invalid MTU 16711680 requested, hw max 65508 device lo entered promiscuous mode sock: process `syz-executor7' is using obsolete getsockopt SO_BSDCOMPAT SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535 sclass=netlink_route_socket pig=5988 comm=syz-executor3 TCP: request_sock_TCP: Possible SYN flooding on port 20008. Sending cookies. Check SNMP counters.