====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170824+ #8 Not tainted ------------------------------------------------------ kworker/0:0/3 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: [] _rcu_barrier+0x33d/0x7a0 kernel/rcu/tree.c:3525 but task is already holding lock: (rcu_sched_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x13f/0x7a0 kernel/rcu/tree.c:3502 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (rcu_sched_state.barrier_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 _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 -> #2 ((&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 -> #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] _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 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: cpu_hotplug_lock.rw_sem --> (&map->work) --> rcu_sched_state.barrier_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rcu_sched_state.barrier_mutex); lock((&map->work)); lock(rcu_sched_state.barrier_mutex); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 3 locks held by kworker/0:0/3: #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 #2: (rcu_sched_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x13f/0x7a0 kernel/rcu/tree.c:3502 stack backtrace: CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.13.0-rc6-next-20170824+ #8 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 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 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 QAT: Invalid ioctl capability: warning: `syz-executor6' uses 32-bit capabilities (legacy support in use) netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. sctp: [Deprecated]: syz-executor3 (pid 3661) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. mmap: syz-executor6 (3721) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. QAT: Invalid ioctl raw_sendmsg: syz-executor4 forgot to set AF_INET. Fix it! QAT: Invalid ioctl audit: type=1326 audit(1503602416.521:3): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3854 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503602416.614:4): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3854 comm="syz-executor0" exe="/root/syz-executor0" 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=3894 comm=syz-executor2 audit: type=1326 audit(1503602416.661:5): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3887 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503602416.749:6): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3887 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 sg_write: data in/out 263061472/176 bytes for SCSI command 0xa-- guessing data in; program syz-executor4 not setting count and/or reply_len properly sg_write: data in/out 263061472/176 bytes for SCSI command 0xa-- guessing data in; program syz-executor4 not setting count and/or reply_len properly netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. device lo entered promiscuous mode netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor5'. device lo left promiscuous mode device lo entered promiscuous mode netlink: 13 bytes leftover after parsing attributes in process `syz-executor5'. device lo left promiscuous mode audit: type=1326 audit(1503602418.094:7): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4197 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503602418.176:8): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4228 comm="syz-executor5" exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns TCP: request_sock_TCP: Possible SYN flooding on port 20020. Sending cookies. Check SNMP counters. SELinux: failure in selinux_parse_skb(), unable to parse packet SELinux: failure in selinux_parse_skb(), unable to parse packet device lo entered promiscuous mode ICMPv6: NA: someone advertises our address fe80:0000:0000:0000:0000:0000:0000:04aa on syz4! ICMPv6: NA: someone advertises our address fe80:0000:0000:0000:0000:0000:0000:04aa on syz4! *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=fffffffffffff871 CR3 = 0x0000000000100802 RSP = 0x000000000000fffa RIP = 0x0000000000000000 RFLAGS=0x00033000 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 audit: type=1326 audit(1503602419.256:9): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4502 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 *** Host State *** RIP = 0xffffffff811b6277 RSP = 0xffff8801d0e074c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f3db23b0700 GSBase=ffff8801db200000 TRBase=ffff8801db223100 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001d08a2000 CR4=00000000001426f0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d9d0a0 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=0000004a 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=00000003 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffe22508cb3e EPT pointer = 0x00000001c14b801e kvm: pic: non byte read kvm: pic: non byte write audit: type=1326 audit(1503602419.628:10): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4547 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 audit: type=1326 audit(1503602419.686:11): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4547 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 QAT: Invalid ioctl RDS: rds_bind could not find a transport for 224.0.0.2, load rds_tcp or rds_rdma? QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl nla_parse: 3 callbacks suppressed netlink: 6 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1326 audit(1503602420.901:12): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4793 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 kvm: vcpu 4: requested 68374 ns lapic timer period limited to 500000 ns netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1326 audit(1503602421.034:13): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4793 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. lo: Invalid MTU -33619942 requested, hw min 0 device lo entered promiscuous mode netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. lo: Invalid MTU -33619942 requested, hw min 0 device syz4 entered promiscuous mode QAT: Invalid ioctl sctp: [Deprecated]: syz-executor5 (pid 5096) Use of int in maxseg socket option. Use struct sctp_assoc_value instead QAT: Invalid ioctl audit: type=1326 audit(1503602422.547:14): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5301 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 rpcbind: RPC call returned error 22 RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? rpcbind: RPC call returned error 22 audit: type=1326 audit(1503602422.609:15): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5301 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl TCP: request_sock_TCP: Possible SYN flooding on port 20020. Sending cookies. Check SNMP counters. sctp: [Deprecated]: syz-executor7 (pid 5487) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 5506) Use of int in maxseg socket option. Use struct sctp_assoc_value instead kvm_pmu: event creation failed -2 sctp: [Deprecated]: syz-executor5 (pid 5624) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead insert transport fail, errno -17 audit: type=1326 audit(1503602423.526:16): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5631 comm="syz-executor3" exe="/root/syz-executor3" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x0 audit: type=1326 audit(1503602423.588:17): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5631 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-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 19 bytes leftover after parsing attributes in process `syz-executor6'. sctp: [Deprecated]: syz-executor5 (pid 5679) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 5694) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead