====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ kworker/u4:5/3298 is trying to acquire lock: ((complete)&rcu.completion){+.+.}, at: [] __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 but task is already holding lock: (slab_mutex){+.+.}, at: [] kmem_cache_destroy+0x30/0x250 mm/slab_common.c:821 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (slab_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 kmem_cache_create+0x39/0x2a0 mm/slab_common.c:435 ptlock_cache_init+0x24/0x2d mm/memory.c:4632 pgtable_init include/linux/mm.h:1756 [inline] mm_init init/main.c:504 [inline] start_kernel+0x3d4/0x7ad init/main.c:569 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:381 x86_64_start_kernel+0x13c/0x149 arch/x86/kernel/head64.c:362 verify_cpu+0x0/0xfb -> #2 (memcg_cache_ids_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 down_read+0x96/0x150 kernel/locking/rwsem.c:23 memcg_get_cache_ids+0x10/0x20 mm/memcontrol.c:274 list_lru_destroy+0x96/0x490 mm/list_lru.c:573 deactivate_locked_super+0x94/0xd0 fs/super.c:315 deactivate_super+0x141/0x1b0 fs/super.c:339 cleanup_mnt+0xb2/0x150 fs/namespace.c:1113 mntput_no_expire+0x6e0/0xa90 fs/namespace.c:1179 mntput fs/namespace.c:1189 [inline] kern_unmount+0x9c/0xd0 fs/namespace.c:2934 pid_ns_release_proc+0x37/0x50 fs/proc/root.c:231 proc_cleanup_work+0x19/0x20 kernel/pid_namespace.c:79 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 -> #1 ((&ns->proc_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 -> #0 ((complete)&rcu.completion){+.+.}: 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 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_shutdown+0x9/0x10 mm/kasan/kasan.c:381 shutdown_cache+0x15/0x1b0 mm/slab_common.c:531 kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829 tipc_server_stop+0x13f/0x190 net/tipc/server.c:636 tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 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: (complete)&rcu.completion --> memcg_cache_ids_sem --> slab_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(slab_mutex); lock(memcg_cache_ids_sem); lock(slab_mutex); lock((complete)&rcu.completion); *** DEADLOCK *** 5 locks held by kworker/u4:5/3298: #0: ("%s""netns"){.+.+}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("%s""netns"){.+.+}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("%s""netns"){.+.+}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("%s""netns"){.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("%s""netns"){.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("%s""netns"){.+.+}, at: [] process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x247/0xb60 net/core/net_namespace.c:449 #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:126 [inline] #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] kmem_cache_destroy+0x22/0x250 mm/slab_common.c:818 #4: (slab_mutex){+.+.}, at: [] kmem_cache_destroy+0x30/0x250 mm/slab_common.c:821 stack backtrace: CPU: 1 PID: 3298 Comm: kworker/u4:5 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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 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_shutdown+0x9/0x10 mm/kasan/kasan.c:381 shutdown_cache+0x15/0x1b0 mm/slab_common.c:531 kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829 tipc_server_stop+0x13f/0x190 net/tipc/server.c:636 tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 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 device syz1 entered promiscuous mode device syz1 left promiscuous mode device syz1 entered promiscuous mode netlink: 11 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor3'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3963 comm=syz-executor3 netlink: 13 bytes leftover after parsing attributes in process `syz-executor4'. QAT: Invalid ioctl netlink: 13 bytes leftover after parsing attributes in process `syz-executor4'. *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000031, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000020, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0050:0000000000002810 CS: sel=0x0000, attr=0x0409b, limit=0x000fffff, base=0x0000000000000000 DS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 SS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 ES: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 FS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 GS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 GDTR: limit=0x000007ff, base=0x0000000000001000 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 IDTR: limit=0x000001ff, base=0x0000000000003800 TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000004001 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8fd7 RSP = 0xffff8801cbf874c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f209bd6e700 GSBase=ffff8801db300000 TRBase=ffff8801db323100 GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001d8cf0000 CR4=00000000001426e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84da5a60 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=0000004a EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=00060042 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 = 0xffffffe231d979d2 EPT pointer = 0x00000001d7a1501e netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 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 = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8fd7 RSP = 0xffff8801cbf874c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f209bd6e700 GSBase=ffff8801db300000 TRBase=ffff8801db323100 GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001d8cf0000 CR4=00000000001426e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84da5a60 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=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffe226247e3f EPT pointer = 0x00000001d693901e SELinux: failure in selinux_parse_skb(), unable to parse packet SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=4241 comm=syz-executor1 kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. device syz6 entered promiscuous mode netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. device syz6 left promiscuous mode device syz6 entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=1 sclass=netlink_tcpdiag_socket pig=4478 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=1 sclass=netlink_tcpdiag_socket pig=4514 comm=syz-executor2 netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. sock: process `syz-executor0' is using obsolete getsockopt SO_BSDCOMPAT TCP: request_sock_TCP: Possible SYN flooding on port 20020. Sending cookies. Check SNMP counters. sock: sock_set_timeout: `syz-executor7' (pid 4839) tries to set negative timeout sock: sock_set_timeout: `syz-executor7' (pid 4839) tries to set negative timeout netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. audit: type=1326 audit(1503813264.558:4): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4880 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 capability: warning: `syz-executor6' uses deprecated v2 capabilities in a way that may be insecure audit: type=1326 audit(1503813264.676:5): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=4880 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 sctp: [Deprecated]: syz-executor3 (pid 4936) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 4936) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sock: process `syz-executor2' is using obsolete getsockopt SO_BSDCOMPAT