====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ kworker/1:2/3247 is trying to acquire lock: (rcu_sched_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x13f/0x7a0 kernel/rcu/tree.c:3502 but task is already holding lock: ((&map->work)){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 ((&map->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 -> #2 ((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 -> #1 (cpu_hotplug_lock.rw_sem){++++}: 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] _rcu_barrier+0x33d/0x7a0 kernel/rcu/tree.c:3525 rcu_barrier_sched kernel/rcu/tree.c:3591 [inline] rcu_barrier+0x10/0x20 kernel/rcu/tree_plugin.h:891 netdev_run_todo+0x28f/0xca0 net/core/dev.c:7824 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:106 tun_detach drivers/net/tun.c:588 [inline] tun_chr_close+0x49/0x60 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 -> #0 (rcu_sched_state.barrier_mutex){+.+.}: 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 __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 _rcu_barrier+0x13f/0x7a0 kernel/rcu/tree.c:3502 rcu_barrier_sched kernel/rcu/tree.c:3591 [inline] rcu_barrier+0x10/0x20 kernel/rcu/tree_plugin.h:891 htab_map_free+0x9d/0x640 kernel/bpf/hashtab.c:1112 bpf_map_free_deferred+0xac/0xd0 kernel/bpf/syscall.c:209 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 other info that might help us debug this: Chain exists of: rcu_sched_state.barrier_mutex --> (complete)&rcu.completion --> (&map->work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&map->work)); lock((complete)&rcu.completion); lock((&map->work)); lock(rcu_sched_state.barrier_mutex); *** DEADLOCK *** 2 locks held by kworker/1:2/3247: #0: ("events"){.+.+}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("events"){.+.+}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("events"){.+.+}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("events"){.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("events"){.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("events"){.+.+}, at: [] process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090 #1: ((&map->work)){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 stack backtrace: CPU: 1 PID: 3247 Comm: kworker/1:2 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events bpf_map_free_deferred 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 __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 _rcu_barrier+0x13f/0x7a0 kernel/rcu/tree.c:3502 rcu_barrier_sched kernel/rcu/tree.c:3591 [inline] rcu_barrier+0x10/0x20 kernel/rcu/tree_plugin.h:891 htab_map_free+0x9d/0x640 kernel/bpf/hashtab.c:1112 bpf_map_free_deferred+0xac/0xd0 kernel/bpf/syscall.c:209 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 device lo entered promiscuous mode device lo left promiscuous mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor5'. hrtimer: interrupt took 24813 ns netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1326 audit(1503850189.220:4): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3551 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503850189.283:5): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3551 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 mmap: syz-executor4 (3624) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu audit: type=1326 audit(1503850189.746:6): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3709 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 tmpfs: No value for mount option 'Em2?[f)ԇ$-tc%osXYQ-E FˬgKT\ê65Eq`UVͼLvT(b7OtBDbNZ' audit: type=1326 audit(1503850189.862:7): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3709 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 tmpfs: No value for mount option 'Em2?[f)ԇ$-tc%osXYQ-E FˬgKT\ê65Eq`UVͼLvT(b7OtBDbNZ' capability: warning: `syz-executor4' uses deprecated v2 capabilities in a way that may be insecure SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3769 comm=syz-executor5 audit: type=1326 audit(1503850189.978:8): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3775 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3766 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3769 comm=syz-executor5 audit: type=1326 audit(1503850190.106:9): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3775 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 TCP: request_sock_TCPv6: Possible SYN flooding on port 20009. Sending cookies. Check SNMP counters. audit: type=1326 audit(1503850190.592:10): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3948 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 sd 0:0:1:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#0 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#0 CDB[00]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 QAT: Invalid ioctl TCP: request_sock_TCPv6: Possible SYN flooding on port 20029. Sending cookies. Check SNMP counters. sd 0:0:1:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#0 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#0 CDB[00]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 tty_warn_deprecated_flags: 'syz-executor0' is using deprecated serial flags (with no effect): 00000400 QAT: Invalid ioctl audit: type=1326 audit(1503850190.804:11): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3948 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 tty_warn_deprecated_flags: 'syz-executor0' is using deprecated serial flags (with no effect): 00000400 capability: warning: `syz-executor4' uses 32-bit capabilities (legacy support in use) device syz4 entered promiscuous mode device syz4 left promiscuous mode device syz4 entered promiscuous mode sctp: [Deprecated]: syz-executor6 (pid 4224) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 4252) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead print_req_error: I/O error, dev loop0, sector 0 QAT: Invalid ioctl device syz3 entered promiscuous mode device syz3 left promiscuous mode QAT: Invalid ioctl device syz3 entered promiscuous mode device syz3 left promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl kauditd_printk_skb: 301 callbacks suppressed QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1326 audit(1503850192.694:313): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4577 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503850192.751:314): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4591 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 9pnet_virtio: no channels available for device ./file0 audit: type=1326 audit(1503850192.808:315): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4577 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 9pnet_virtio: no channels available for device ./file0 audit: type=1326 audit(1503850192.899:316): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4591 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 device  entered promiscuous mode device  left promiscuous mode sock: sock_set_timeout: `syz-executor4' (pid 4703) tries to set negative timeout sock: sock_set_timeout: `syz-executor4' (pid 4741) tries to set negative timeout audit: type=1326 audit(1503850193.303:317): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4739 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. audit: type=1326 audit(1503850193.399:318): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4739 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 rpcbind: RPC call returned error 22 nla_parse: 36 callbacks suppressed netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'. sctp: [Deprecated]: syz-executor6 (pid 4990) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. sctp: [Deprecated]: syz-executor6 (pid 5005) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl QAT: Invalid ioctl rfkill: input handler disabled rfkill: input handler enabled QAT: Invalid ioctl Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable selinux_nlmsg_perm: 5 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5249 comm=syz-executor3 Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1326 audit(1503850195.744:319): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5322 comm="syz-executor3" exe="/root/syz-executor3" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x0 netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. audit: type=1326 audit(1503850195.879:320): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5322 comm="syz-executor3" exe="/root/syz-executor3" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x0 kvm [5374]: vcpu0, guest rIP: 0x9114 disabled perfctr wrmsr: 0x186 data 0x32b8000000001043 kvm [5374]: vcpu0, guest rIP: 0x9114 disabled perfctr wrmsr: 0x186 data 0x32b8000000001043 audit: type=1326 audit(1503850196.242:321): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5468 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503850196.256:322): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5468 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 device syz4 left promiscuous mode sctp: [Deprecated]: syz-executor0 (pid 5595) Use of int in maxseg socket option. Use struct sctp_assoc_value instead QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl do_dccp_setsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app QAT: Invalid ioctl do_dccp_setsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app SELinux: failure in selinux_parse_skb(), unable to parse packet sock: process `syz-executor3' is using obsolete getsockopt SO_BSDCOMPAT SELinux: failure in selinux_parse_skb(), unable to parse packet