====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ kworker/0:3/6993 is trying to acquire lock: ((&(&key->work)->work)){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 but now in release context of a crosslock acquired at the following: ((complete)&rcu.completion){+.+.}, at: [] __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #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 __static_key_slow_dec kernel/jump_label.c:213 [inline] jump_label_update_timeout+0x12/0x30 kernel/jump_label.c:222 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 -> #0 ((&(&key->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 other info that might help us debug this: Chain exists of: (&(&key->work)->work) --> cpu_hotplug_lock.rw_sem --> (complete)&rcu.completion Possible unsafe locking scenario by crosslock: CPU0 CPU1 ---- ---- lock(cpu_hotplug_lock.rw_sem); lock((complete)&rcu.completion); lock((&(&key->work)->work)); unlock((complete)&rcu.completion); *** DEADLOCK *** 3 locks held by kworker/0:3/6993: #0: ("events_power_efficient"){.+.+}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("events_power_efficient"){.+.+}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("events_power_efficient"){.+.+}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("events_power_efficient"){.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("events_power_efficient"){.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("events_power_efficient"){.+.+}, at: [] process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090 #1: ((&(&sdp->work)->work)){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 #2: (&x->wait#5){....}, at: [] complete+0x18/0x80 kernel/sched/completion.c:34 stack backtrace: CPU: 0 PID: 6993 Comm: kworker/0:3 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_power_efficient srcu_invoke_callbacks 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 commit_xhlock kernel/locking/lockdep.c:5002 [inline] commit_xhlocks kernel/locking/lockdep.c:5046 [inline] lock_commit_crosslock+0xe73/0x1d10 kernel/locking/lockdep.c:5085 complete_release_commit include/linux/completion.h:49 [inline] complete+0x24/0x80 kernel/sched/completion.c:39 wakeme_after_rcu+0xd/0x10 kernel/rcu/update.c:376 srcu_invoke_callbacks+0x280/0x4d0 kernel/rcu/srcutree.c:1161 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 sctp: [Deprecated]: syz-executor4 (pid 7601) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead tty_warn_deprecated_flags: 'syz-executor0' is using deprecated serial flags (with no effect): 00000400 sctp: [Deprecated]: syz-executor4 (pid 7601) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead tty_warn_deprecated_flags: 'syz-executor0' is using deprecated serial flags (with no effect): 00000400 sctp: [Deprecated]: syz-executor3 (pid 7646) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead kauditd_printk_skb: 200 callbacks suppressed audit: type=1326 audit(1503754116.934:220): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7669 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 sctp: [Deprecated]: syz-executor3 (pid 7678) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead lo: Invalid MTU -33619942 requested, hw min 0 audit: type=1326 audit(1503754116.983:221): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7669 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 lo: Invalid MTU -33619942 requested, hw min 0 mmap: syz-executor4 (7723): VmData 2019328 exceed data ulimit 0. Update limits or use boot option ignore_rlimit_data. QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. kvm: vcpu 4: requested 68374 ns lapic timer period limited to 500000 ns netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. kvm: vcpu 4: requested 68374 ns lapic timer period limited to 500000 ns sctp: [Deprecated]: syz-executor1 (pid 7877) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor1 (pid 7897) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead kvm: pic: non byte write kvm: pic: single mode not supported kvm: pic: non byte write kvm: pic: single mode not supported netlink: 2 bytes leftover after parsing attributes in process `syz-executor2'. 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 audit: type=1326 audit(1503754119.302:222): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. audit: type=1326 audit(1503754119.302:223): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.302:224): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.302:225): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.303:226): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.303:227): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.303:228): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754119.307:229): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8345 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. IPv6: NLM_F_REPLACE set, but no existing node found! *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000011, gh_mask=fffffffffffffff7 netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. IPv6: NLM_F_REPLACE set, but no existing node found! Assertion failed! net/irda/ircomm/ircomm_core.c:ircomm_flow_request:475 self != NULL *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000011, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000010, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0030:0000000000002810 CS: sel=0x0030, 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 = 0x0000000000001001 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8fd7 RSP = 0xffff8801cc5cf4c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f09dee40700 GSBase=ffff8801db300000 TRBase=ffff8801db323100 GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=000000019d4de000 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 = 0xffffffd2a1c5ea4e EPT pointer = 0x00000001d026501e netlink: 9 bytes leftover after parsing attributes in process `syz-executor4'. CR4: actual=0x0000000000002050, shadow=0x0000000000000010, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0030:0000000000002810 CS: sel=0x0030, 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 = 0x0000000000001001 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8fd7 RSP = 0xffff8801c881f4c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f09dee83700 GSBase=ffff8801db300000 TRBase=ffff8801db223100 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=000000019d4de000 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 = 0xffffffd2b309c4e1 EPT pointer = 0x00000001d85b401e netlink: 9 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 72 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 72 bytes leftover after parsing attributes in process `syz-executor4'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=59666 sclass=netlink_route_socket pig=8924 comm=syz-executor1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=59666 sclass=netlink_route_socket pig=8944 comm=syz-executor1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. rfkill: input handler disabled rfkill: input handler enabled kvm [9461]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8 kvm [9461]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8 kvm: pic: non byte write kvm: pic: single mode not supported kvm: pic: non byte write kvm: pic: single mode not supported QAT: Invalid ioctl QAT: Invalid ioctl sock: process `syz-executor5' is using obsolete getsockopt SO_BSDCOMPAT QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535 sclass=netlink_route_socket pig=9884 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535 sclass=netlink_route_socket pig=9884 comm=syz-executor2 kauditd_printk_skb: 442 callbacks suppressed audit: type=1326 audit(1503754125.878:672): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9962 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x50000 audit: type=1326 audit(1503754125.907:673): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9962 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=2 compat=0 ip=0x40b871 code=0x50000