[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 45.099093][ T25] audit: type=1800 audit(1575383281.893:25): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 45.119053][ T25] audit: type=1800 audit(1575383281.893:26): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 45.153931][ T25] audit: type=1800 audit(1575383281.893:27): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.67' (ECDSA) to the list of known hosts. 2019/12/03 14:28:13 fuzzer started 2019/12/03 14:28:14 dialing manager at 10.128.0.26:45711 2019/12/03 14:28:14 syscalls: 2689 2019/12/03 14:28:14 code coverage: enabled 2019/12/03 14:28:14 comparison tracing: enabled 2019/12/03 14:28:14 extra coverage: extra coverage is not supported by the kernel 2019/12/03 14:28:14 setuid sandbox: enabled 2019/12/03 14:28:14 namespace sandbox: enabled 2019/12/03 14:28:14 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/03 14:28:14 fault injection: enabled 2019/12/03 14:28:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/03 14:28:14 net packet injection: enabled 2019/12/03 14:28:14 net device setup: enabled 2019/12/03 14:28:14 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/12/03 14:28:14 devlink PCI setup: PCI device 0000:00:10.0 is not available 14:28:16 executing program 0: perf_event_open(&(0x7f000001d000)={0x1, 0x70, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @perf_bp={0x0}}, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0) r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000240)={0x26, 'hash\x00', 0x0, 0x0, 'sha224-generic\x00'}, 0x58) r1 = accept4(r0, 0x0, 0x0, 0x0) sendmmsg$unix(r1, &(0x7f0000001300)=[{&(0x7f0000000980)=@file={0x0, './file0/file0\x00'}, 0x6e, &(0x7f0000000dc0), 0x0, &(0x7f0000000e40)}], 0x500, 0x0) 14:28:16 executing program 1: sendmsg$nl_netfilter(0xffffffffffffffff, &(0x7f0000001640)={0x0, 0x0, &(0x7f0000001600)={&(0x7f0000001280)=ANY=[@ANYBLOB="e6ff03005400005531fe0500fac9067f076748b4f245", @ANYBLOB="740081008ca31d3f003b54c91df8a31be46a014d43e66871c22ee20ce70f39885b2007369348b27eceb52aec5737ca70af71bee3b7a6117929e7b1d46d38b6a6b6c3285bb01e4d5d627b0f0911da0beb35110832bb0cbf909651c8c600fbde031f3161edefb1ba0706eb9644ce21b8e89e7d3b9df6001f00ff6a4518c96e417975eb8dbfcd05c1"], 0x9d}}, 0x0) r0 = socket$inet6_tcp(0xa, 0x1, 0x0) r1 = dup2(r0, r0) ioctl$PERF_EVENT_IOC_ENABLE(r1, 0x8912, 0x400200) sendmsg$nl_route(0xffffffffffffffff, &(0x7f0000000040)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000080)=ANY=[@ANYBLOB="3400000018000000000000000000000001da18f5432d1e41", @ANYRES32=0x0, @ANYBLOB="1800010014"], 0x3}}, 0x0) syz_mount_image$ext4(&(0x7f0000000080)='ext4\x00', &(0x7f0000000000)='./file0\x00', 0x0, 0x898fd13755b449c, &(0x7f0000000100)=[{&(0x7f0000000040)="800000003804000019000300e60100006c000000000000000100000001000000004000000040000080000000000000006d5ebe5a0000ffff53ef", 0xff66, 0x400}], 0x5, 0x0) syzkaller login: [ 59.468790][ T8389] IPVS: ftp: loaded support on port[0] = 21 [ 59.583613][ T8391] IPVS: ftp: loaded support on port[0] = 21 14:28:16 executing program 2: r0 = socket$nl_xfrm(0x10, 0x3, 0x6) sendmsg$nl_xfrm(r0, &(0x7f0000001dc0)={0x0, 0x0, &(0x7f0000001d80)={&(0x7f0000000280)=@newsa={0x138, 0x10, 0x1, 0x0, 0x0, {{@in, @in=@broadcast}, {@in6=@local, 0x0, 0x6c}, @in6=@ipv4, {}, {}, {}, 0x0, 0x0, 0xa}, [@algo_comp={0x48, 0x3, {{'lzjh\x00'}}}]}, 0x138}}, 0x0) [ 59.721473][ T8389] chnl_net:caif_netlink_parms(): no params data found [ 59.756641][ T8391] chnl_net:caif_netlink_parms(): no params data found [ 59.823824][ T8389] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.832438][ T8389] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.843306][ T8389] device bridge_slave_0 entered promiscuous mode [ 59.864940][ T8391] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.872651][ T8391] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.882553][ T8391] device bridge_slave_0 entered promiscuous mode [ 59.890399][ T8389] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.897484][ T8389] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.909637][ T8389] device bridge_slave_1 entered promiscuous mode [ 59.921222][ T8391] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.928974][ T8391] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.937027][ T8391] device bridge_slave_1 entered promiscuous mode [ 59.984486][ T8389] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 59.996852][ T8391] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 60.010788][ T8389] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 60.035959][ T8391] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 60.070764][ T8389] team0: Port device team_slave_0 added 14:28:16 executing program 3: perf_event_open(&(0x7f0000000180)={0x1, 0x70, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @perf_config_ext}, 0x0, 0x0, 0xffffffffffffffff, 0x0) r0 = socket$inet6(0xa, 0x400000000001, 0x0) close(r0) openat$cgroup_ro(0xffffffffffffffff, 0x0, 0x0, 0x0) set_mempolicy(0x2, &(0x7f0000000040)=0x5c9, 0x4) r1 = open(&(0x7f0000000080)='./bus\x00', 0x141042, 0x0) getpid() ftruncate(r1, 0x200004) sendfile(r0, r1, 0x0, 0x80001d00c0d0) [ 60.083995][ T8395] IPVS: ftp: loaded support on port[0] = 21 [ 60.091510][ T8389] team0: Port device team_slave_1 added [ 60.100279][ T8391] team0: Port device team_slave_0 added [ 60.108024][ T8391] team0: Port device team_slave_1 added [ 60.223041][ T8389] device hsr_slave_0 entered promiscuous mode [ 60.279584][ T8389] device hsr_slave_1 entered promiscuous mode 14:28:17 executing program 4: syz_init_net_socket$ax25(0x3, 0x5, 0x1) [ 60.361376][ T8391] device hsr_slave_0 entered promiscuous mode [ 60.398863][ T8391] device hsr_slave_1 entered promiscuous mode [ 60.438600][ T8391] debugfs: Directory 'hsr0' with parent '/' already present! [ 60.502882][ T8397] IPVS: ftp: loaded support on port[0] = 21 [ 60.551491][ T8389] netdevsim netdevsim0 netdevsim0: renamed from eth0 14:28:17 executing program 5: r0 = syz_open_dev$loop(&(0x7f0000000180)='/dev/loop#\x00', 0x0, 0x0) r1 = openat$md(0xffffffffffffff9c, &(0x7f0000000040)='/dev/md0\x00', 0x4100, 0x0) ioctl$LOOP_CHANGE_FD(r0, 0x4c00, r1) ioctl$LOOP_CHANGE_FD(r0, 0x4c08, 0xffffffffffffffff) [ 60.607056][ T8389] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 60.751104][ T8389] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 60.821543][ T8389] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 60.875151][ T8391] netdevsim netdevsim1 netdevsim0: renamed from eth0 [ 60.923082][ T8391] netdevsim netdevsim1 netdevsim1: renamed from eth1 [ 60.996863][ T8399] IPVS: ftp: loaded support on port[0] = 21 [ 60.996931][ T8403] IPVS: ftp: loaded support on port[0] = 21 [ 61.003700][ T8391] netdevsim netdevsim1 netdevsim2: renamed from eth2 [ 61.092205][ T8395] chnl_net:caif_netlink_parms(): no params data found [ 61.100723][ T8391] netdevsim netdevsim1 netdevsim3: renamed from eth3 [ 61.243737][ T8395] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.251695][ T8395] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.260630][ T8395] device bridge_slave_0 entered promiscuous mode [ 61.269457][ T8395] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.276529][ T8395] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.285703][ T8395] device bridge_slave_1 entered promiscuous mode [ 61.308561][ T8395] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 61.346418][ T8395] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 61.394655][ T8395] team0: Port device team_slave_0 added [ 61.403441][ T8395] team0: Port device team_slave_1 added [ 61.452901][ T8397] chnl_net:caif_netlink_parms(): no params data found [ 61.511589][ T8395] device hsr_slave_0 entered promiscuous mode [ 61.559037][ T8395] device hsr_slave_1 entered promiscuous mode [ 61.609104][ T8395] debugfs: Directory 'hsr0' with parent '/' already present! [ 61.637463][ T8397] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.644792][ T8397] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.653251][ T8397] device bridge_slave_0 entered promiscuous mode [ 61.661811][ T8397] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.669147][ T8397] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.676947][ T8397] device bridge_slave_1 entered promiscuous mode [ 61.747522][ T8399] chnl_net:caif_netlink_parms(): no params data found [ 61.777602][ T8397] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 61.789998][ T8403] chnl_net:caif_netlink_parms(): no params data found [ 61.811789][ T8389] 8021q: adding VLAN 0 to HW filter on device bond0 [ 61.821112][ T8397] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 61.835593][ T8395] netdevsim netdevsim2 netdevsim0: renamed from eth0 [ 61.875925][ T8395] netdevsim netdevsim2 netdevsim1: renamed from eth1 [ 61.971692][ T8395] netdevsim netdevsim2 netdevsim2: renamed from eth2 [ 62.010481][ T8395] netdevsim netdevsim2 netdevsim3: renamed from eth3 [ 62.065545][ T3123] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 62.074248][ T3123] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.085005][ T8397] team0: Port device team_slave_0 added [ 62.098872][ T8397] team0: Port device team_slave_1 added [ 62.110924][ T8403] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.118088][ T8403] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.125959][ T8403] device bridge_slave_0 entered promiscuous mode [ 62.139927][ T8399] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.146980][ T8399] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.157646][ T8399] device bridge_slave_0 entered promiscuous mode [ 62.165364][ T8403] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.172979][ T8403] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.181307][ T8403] device bridge_slave_1 entered promiscuous mode [ 62.190837][ T8389] 8021q: adding VLAN 0 to HW filter on device team0 [ 62.211736][ T8399] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.222557][ T8399] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.230543][ T8399] device bridge_slave_1 entered promiscuous mode [ 62.254778][ T8391] 8021q: adding VLAN 0 to HW filter on device bond0 [ 62.266870][ T3123] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 62.276541][ T3123] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 62.285414][ T3123] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.292717][ T3123] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.360578][ T8397] device hsr_slave_0 entered promiscuous mode [ 62.398935][ T8397] device hsr_slave_1 entered promiscuous mode [ 62.438748][ T8397] debugfs: Directory 'hsr0' with parent '/' already present! [ 62.456081][ T8391] 8021q: adding VLAN 0 to HW filter on device team0 [ 62.464474][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 62.473498][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 62.481773][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.494183][ T8399] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 62.505527][ T8403] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 62.521464][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 62.530636][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 62.539364][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.546445][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.560654][ T8399] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 62.580558][ T8403] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 62.597433][ T8404] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 62.606403][ T8404] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 62.615878][ T8404] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.623004][ T8404] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.633007][ T8404] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready [ 62.642618][ T8404] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 62.689194][ T8403] team0: Port device team_slave_0 added [ 62.697490][ T8399] team0: Port device team_slave_0 added [ 62.707599][ T8397] netdevsim netdevsim3 netdevsim0: renamed from eth0 [ 62.740906][ T8397] netdevsim netdevsim3 netdevsim1: renamed from eth1 [ 62.771356][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready [ 62.782742][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 62.791694][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 62.800266][ T8402] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.807310][ T8402] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.827926][ T8389] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 62.839417][ T8389] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 62.863105][ T8403] team0: Port device team_slave_1 added [ 62.871691][ T8399] team0: Port device team_slave_1 added [ 62.877908][ T8397] netdevsim netdevsim3 netdevsim2: renamed from eth2 [ 62.931182][ T8397] netdevsim netdevsim3 netdevsim3: renamed from eth3 [ 62.971921][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 62.981951][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 62.991217][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 63.000815][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 63.009766][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 63.018053][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 63.027615][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 63.036395][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 63.044988][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready [ 63.053772][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready [ 63.062672][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 63.071331][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 63.101478][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 63.110532][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 63.118766][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 63.126685][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 63.136689][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 63.145759][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 63.154495][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 63.163195][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 63.170891][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 63.178723][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 63.187090][ T8402] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 63.208315][ T8391] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 63.242049][ T8403] device hsr_slave_0 entered promiscuous mode [ 63.289206][ T8403] device hsr_slave_1 entered promiscuous mode [ 63.340140][ T8403] debugfs: Directory 'hsr0' with parent '/' already present! [ 63.349819][ T8389] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 63.421603][ T8399] device hsr_slave_0 entered promiscuous mode [ 63.449095][ T8399] device hsr_slave_1 entered promiscuous mode [ 63.508619][ T8399] debugfs: Directory 'hsr0' with parent '/' already present! [ 63.613130][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 63.621238][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 63.634357][ T8391] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 63.644171][ T8403] netdevsim netdevsim5 netdevsim0: renamed from eth0 [ 63.704691][ T8403] netdevsim netdevsim5 netdevsim1: renamed from eth1 [ 63.743750][ T8403] netdevsim netdevsim5 netdevsim2: renamed from eth2 [ 63.801724][ T8403] netdevsim netdevsim5 netdevsim3: renamed from eth3 [ 63.887859][ T8399] netdevsim netdevsim4 netdevsim0: renamed from eth0 [ 168.908423][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 168.915283][ C0] rcu: 0-....: (10499 ticks this GP) idle=3f6/1/0x4000000000000002 softirq=11648/11651 fqs=2772 [ 168.926084][ C0] (t=10500 jiffies g=6801 q=177) [ 168.931101][ C0] rcu: rcu_preempt kthread starved for 4947 jiffies! g6801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 168.942100][ C0] rcu: RCU grace-period kthread stack dump: [ 168.947986][ C0] rcu_preempt R running task 29032 10 2 0x80004000 [ 168.955882][ C0] Call Trace: [ 168.959174][ C0] __schedule+0x9a0/0xcc0 [ 168.963518][ C0] schedule+0x181/0x210 [ 168.967664][ C0] schedule_timeout+0x14f/0x240 [ 168.972509][ C0] ? run_local_timers+0x120/0x120 [ 168.977533][ C0] rcu_gp_kthread+0xed8/0x1770 [ 168.982303][ C0] kthread+0x332/0x350 [ 168.986364][ C0] ? rcu_report_qs_rsp+0x140/0x140 [ 168.991470][ C0] ? kthread_blkcg+0xe0/0xe0 [ 168.996065][ C0] ret_from_fork+0x24/0x30 [ 169.000489][ C0] NMI backtrace for cpu 0 [ 169.004813][ C0] CPU: 0 PID: 8389 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 [ 169.013065][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 169.023114][ C0] Call Trace: [ 169.026395][ C0] [ 169.029242][ C0] dump_stack+0x1fb/0x318 [ 169.033568][ C0] nmi_cpu_backtrace+0xaf/0x1a0 [ 169.038405][ C0] ? nmi_trigger_cpumask_backtrace+0x16d/0x290 [ 169.044557][ C0] ? arch_trigger_cpumask_backtrace+0x20/0x20 [ 169.050622][ C0] nmi_trigger_cpumask_backtrace+0x174/0x290 [ 169.056601][ C0] arch_trigger_cpumask_backtrace+0x10/0x20 [ 169.062490][ C0] rcu_dump_cpu_stacks+0x15a/0x220 [ 169.067603][ C0] rcu_sched_clock_irq+0xe25/0x1ad0 [ 169.072802][ C0] ? trace_hardirqs_off+0x74/0x80 [ 169.077822][ C0] update_process_times+0x12d/0x180 [ 169.083015][ C0] tick_sched_timer+0x263/0x420 [ 169.087858][ C0] ? tick_setup_sched_timer+0x3d0/0x3d0 [ 169.093397][ C0] __hrtimer_run_queues+0x403/0x840 [ 169.098601][ C0] hrtimer_interrupt+0x38c/0xda0 [ 169.103551][ C0] ? debug_smp_processor_id+0x9/0x20 [ 169.108831][ C0] smp_apic_timer_interrupt+0x109/0x280 [ 169.114371][ C0] apic_timer_interrupt+0xf/0x20 [ 169.119297][ C0] [ 169.122232][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x14/0x50 [ 169.128380][ C0] Code: 00 00 00 48 8b 3d 74 25 cd 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 83 fa 02 75 21 48 8b 91 [ 169.147993][ C0] RSP: 0018:ffffc900026577e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 169.156419][ C0] RAX: ffffffff81486ea4 RBX: ffffea0002315780 RCX: ffff8880937b6080 [ 169.164386][ C0] RDX: 0000000000000001 RSI: 00000000fffffffc RDI: ffffea0002315780 [ 169.172349][ C0] RBP: ffffc90002657820 R08: dffffc0000000000 R09: fffffbfff120248a [ 169.180315][ C0] R10: fffffbfff120248a R11: 0000000000000000 R12: ffff88808c495e20 [ 169.188283][ C0] R13: dffffc0000000000 R14: 1ffff11011892bc4 R15: ffff8880a8485a68 [ 169.196271][ C0] ? free_thread_stack+0x124/0x590 [ 169.201378][ C0] ? free_thread_stack+0x124/0x590 [ 169.206502][ C0] put_task_stack+0xa3/0x130 [ 169.211089][ C0] finish_task_switch+0x3f1/0x550 [ 169.216111][ C0] __schedule+0x9a8/0xcc0 [ 169.220444][ C0] preempt_schedule_irq+0xc1/0x140 [ 169.225553][ C0] retint_kernel+0x1b/0x2b [ 169.229962][ C0] RIP: 0010:down_write+0x6b/0x140 [ 169.234978][ C0] Code: f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 75 08 e8 79 70 6d f9 48 83 c4 08 4c 8d 75 d0 4d 89 f4 49 c1 ec 03 43 80 3c 3c 00 <74> 09 48 8d 7d d0 e8 4a f1 c3 f9 48 c7 45 d0 00 00 00 00 48 89 df [ 169.254599][ C0] RSP: 0018:ffffc90002657a38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 169.263005][ C0] RAX: 1ffffffff12152c5 RBX: ffff8880a0fc4878 RCX: ffffffff815c6b62 [ 169.270972][ C0] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 [ 169.278939][ C0] RBP: ffffc90002657a68 R08: dffffc0000000000 R09: fffffbfff13c8d2d [ 169.286902][ C0] R10: fffffbfff13c8d2d R11: 0000000000000000 R12: 1ffff920004caf47 [ 169.294866][ C0] R13: ffff8880a3204e30 R14: ffffc90002657a38 R15: dffffc0000000000 [ 169.302855][ C0] ? validate_chain+0x92/0x7bc0 [ 169.307705][ C0] ? anon_vma_clone+0x27e/0x600 [ 169.312551][ C0] anon_vma_clone+0x27e/0x600 [ 169.317226][ C0] anon_vma_fork+0x91/0x540 [ 169.321719][ C0] ? dup_userfaultfd+0x99/0x680 [ 169.326560][ C0] ? dup_mmap+0x5b0/0xe00 [ 169.330889][ C0] dup_mmap+0x6b8/0xe00 [ 169.335052][ C0] dup_mm+0x9e/0x340 [ 169.338939][ C0] copy_process+0x1e49/0x5510 [ 169.343635][ C0] _do_fork+0x13e/0x660 [ 169.347786][ C0] ? check_preemption_disabled+0xb4/0x260 [ 169.353497][ C0] ? debug_smp_processor_id+0x9/0x20 [ 169.358773][ C0] ? debug_smp_processor_id+0x1c/0x20 [ 169.364141][ C0] __x64_sys_clone+0x20b/0x250 [ 169.368906][ C0] do_syscall_64+0xf7/0x1c0 [ 169.373405][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 169.379295][ C0] RIP: 0033:0x458c4a [ 169.383209][ C0] Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00 [ 169.402806][ C0] RSP: 002b:00007ffc2bb49a50 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 [ 169.411218][ C0] RAX: ffffffffffffffda RBX: 00007ffc2bb49a50 RCX: 0000000000458c4a [ 169.419198][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 [ 169.427181][ C0] RBP: 00007ffc2bb49a90 R08: 0000000000000001 R09: 00000000012c5940 [ 169.435150][ C0] R10: 00000000012c5c10 R11: 0000000000000246 R12: 0000000000000001 [ 169.443115][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc2bb49ae0