netlink: 13 bytes leftover after parsing attributes in process `syz-executor1'. WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ kworker/2:2/1377 is trying to acquire lock: (&kvm->irqfds.resampler_lock){+.+.}, at: [] irqfd_resampler_shutdown+0xe3/0x6b0 arch/x86/kvm/../../../virt/kvm/eventfd.c:98 but task is already holding lock: ((&irqfd->shutdown)){+.+.}, 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: -> #2 ((&irqfd->shutdown)){+.+.}: 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 kvm_irqfd_assign arch/x86/kvm/../../../virt/kvm/eventfd.c:364 [inline] kvm_irqfd+0x994/0x1d50 arch/x86/kvm/../../../virt/kvm/eventfd.c:572 kvm_vm_ioctl+0x1079/0x1c40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3032 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #0 (&kvm->irqfds.resampler_lock){+.+.}: 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 irqfd_resampler_shutdown+0xe3/0x6b0 arch/x86/kvm/../../../virt/kvm/eventfd.c:98 irqfd_shutdown+0xd8/0x1a0 arch/x86/kvm/../../../virt/kvm/eventfd.c:137 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: &kvm->irqfds.resampler_lock --> (complete)&rcu.completion --> (&irqfd->shutdown) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&irqfd->shutdown)); lock((complete)&rcu.completion); lock((&irqfd->shutdown)); lock(&kvm->irqfds.resampler_lock); *** DEADLOCK *** 2 locks held by kworker/2:2/1377: #0: ("kvm-irqfd-cleanup"){++++}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("kvm-irqfd-cleanup"){++++}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("kvm-irqfd-cleanup"){++++}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("kvm-irqfd-cleanup"){++++}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("kvm-irqfd-cleanup"){++++}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("kvm-irqfd-cleanup"){++++}, at: [] process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090 #1: ((&irqfd->shutdown)){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 stack backtrace: CPU: 2 PID: 1377 Comm: kworker/2:2 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: kvm-irqfd-cleanup irqfd_shutdown 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 irqfd_resampler_shutdown+0xe3/0x6b0 arch/x86/kvm/../../../virt/kvm/eventfd.c:98 irqfd_shutdown+0xd8/0x1a0 arch/x86/kvm/../../../virt/kvm/eventfd.c:137 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 bond0: port 1(syz6) entered blocking state bond0: port 1(syz6) entered disabled state device syz6 entered promiscuous mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20017. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20017. Sending cookies. Check SNMP counters. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=17434 sclass=netlink_route_socket pig=5463 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=17434 sclass=netlink_route_socket pig=5463 comm=syz-executor5 RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? kauditd_printk_skb: 2 callbacks suppressed audit: type=1326 audit(1503859380.519:14): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5510 comm="syz-executor5" exe="/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 audit: type=1326 audit(1503859380.578:15): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=5510 comm="syz-executor5" exe="/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 *** Guest State *** CR0: actual=0x0000000000000030, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000000 RIP = 0x000000000000fff0 RFLAGS=0x00010100 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0xf000, attr=0x0009b, limit=0x0000ffff, base=0x00000000ffff0000 DS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x00093, 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=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 BndCfgS = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8fd7 RSP = 0xffff88004e5274c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f9d11844700 GSBase=ffff88006df00000 TRBase=ffff88006df23100 GDTBase=ffffffffff574000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=000000006bb13000 CR4=00000000000026e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84da5a70 EFER = 0x0000000000000d01 PAT = 0x0007040600070406 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000e2 EntryControls=0001d1ff ExitControls=00afefff ExceptionBitmap=0006004a 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 = 0xffffffd8e5161768 EPT pointer = 0x000000006c52e01e Virtual processor ID = 0x005a sctp: [Deprecated]: syz-executor2 (pid 5696) Use of int in maxseg socket option. Use struct sctp_assoc_value instead rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 sctp: [Deprecated]: syz-executor2 (pid 5734) Use of int in maxseg socket option. Use struct sctp_assoc_value instead QAT: Invalid ioctl PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex