[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.101' (ECDSA) to the list of known hosts. 2021/03/04 12:37:36 parsed 1 programs 2021/03/04 12:37:36 executed programs: 0 syzkaller login: [ 46.971532][ T8377] IPVS: ftp: loaded support on port[0] = 21 [ 47.144401][ T8377] chnl_net:caif_netlink_parms(): no params data found [ 47.189833][ T8377] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.197835][ T8377] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.205445][ T8377] device bridge_slave_0 entered promiscuous mode [ 47.215284][ T8377] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.222722][ T8377] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.230860][ T8377] device bridge_slave_1 entered promiscuous mode [ 47.249596][ T8377] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 47.260383][ T8377] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 47.281092][ T8377] team0: Port device team_slave_0 added [ 47.289307][ T8377] team0: Port device team_slave_1 added [ 47.305461][ T8377] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 47.312477][ T8377] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 47.339402][ T8377] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 47.351843][ T8377] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 47.358872][ T8377] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 47.384829][ T8377] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 47.411206][ T8377] device hsr_slave_0 entered promiscuous mode [ 47.417839][ T8377] device hsr_slave_1 entered promiscuous mode [ 47.504069][ T8377] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 47.514198][ T8377] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 47.524373][ T8377] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 47.533854][ T8377] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 47.555199][ T8377] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.562361][ T8377] bridge0: port 2(bridge_slave_1) entered forwarding state [ 47.570069][ T8377] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.577214][ T8377] bridge0: port 1(bridge_slave_0) entered forwarding state [ 47.616131][ T8377] 8021q: adding VLAN 0 to HW filter on device bond0 [ 47.629735][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 47.640079][ T3817] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.648982][ T3817] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.656645][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 47.670979][ T8377] 8021q: adding VLAN 0 to HW filter on device team0 [ 47.681242][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 47.691224][ T4856] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.698331][ T4856] bridge0: port 1(bridge_slave_0) entered forwarding state [ 47.709219][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.718083][ T3817] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.725116][ T3817] bridge0: port 2(bridge_slave_1) entered forwarding state [ 47.748143][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 47.756483][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 47.766883][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 47.775976][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 47.788024][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 47.798659][ T8377] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 47.814974][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 47.822512][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 47.834848][ T8377] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 47.858187][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 47.870410][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 47.879532][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 47.887715][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 47.897421][ T8377] device veth0_vlan entered promiscuous mode [ 47.909201][ T8377] device veth1_vlan entered promiscuous mode [ 47.928546][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 47.936331][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 47.946023][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 47.956470][ T8377] device veth0_macvtap entered promiscuous mode [ 47.966895][ T8377] device veth1_macvtap entered promiscuous mode [ 47.982494][ T8377] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 47.990347][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 48.000676][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 48.011712][ T8377] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 48.019812][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 48.030999][ T8377] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 48.041106][ T8377] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 48.050881][ T8377] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 48.061464][ T8377] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 48.131003][ T95] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 48.146419][ T95] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 48.165900][ T4856] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 48.184852][ T95] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 48.195941][ T95] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 48.205202][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 49.017805][ T4856] Bluetooth: hci0: command 0x0409 tx timeout 2021/03/04 12:37:41 executed programs: 60 [ 51.096693][ T4856] Bluetooth: hci0: command 0x041b tx timeout [ 52.013454][ T9186] ================================================================== [ 52.021707][ T9186] BUG: KASAN: use-after-free in __cpuhp_state_remove_instance+0x251/0x360 [ 52.030212][ T9186] Read of size 8 at addr ffff888011c52898 by task syz-executor.0/9186 [ 52.038343][ T9186] [ 52.040651][ T9186] CPU: 1 PID: 9186 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller #0 [ 52.049301][ T9186] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.059341][ T9186] Call Trace: [ 52.062625][ T9186] dump_stack+0x125/0x19e [ 52.066955][ T9186] print_address_description+0x5f/0x3a0 [ 52.072553][ T9186] kasan_report+0x15e/0x210 [ 52.077056][ T9186] ? __cpuhp_state_remove_instance+0x251/0x360 [ 52.083199][ T9186] __cpuhp_state_remove_instance+0x251/0x360 [ 52.089166][ T9186] io_wq_create+0x86d/0xa10 [ 52.093657][ T9186] io_uring_alloc_task_context+0x234/0x520 [ 52.099443][ T9186] ? io_free_work+0x30/0x30 [ 52.103927][ T9186] ? tctx_task_work+0x280/0x280 [ 52.108758][ T9186] __se_sys_io_uring_setup+0x1fff/0x2c30 [ 52.114392][ T9186] do_syscall_64+0x2d/0x70 [ 52.118790][ T9186] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 52.124666][ T9186] RIP: 0033:0x465ef9 [ 52.128539][ T9186] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 [ 52.151192][ T9186] RSP: 002b:00007f86cf29c108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 [ 52.159594][ T9186] RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 [ 52.167571][ T9186] RDX: 0000000020f00000 RSI: 0000000020000300 RDI: 00000000000072e8 [ 52.175529][ T9186] RBP: 0000000020000300 R08: 00000000200003c0 R09: 00000000200003c0 [ 52.183495][ T9186] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200003c0 [ 52.191449][ T9186] R13: 0000000020f00000 R14: 0000000000000000 R15: 0000000020d57000 [ 52.199412][ T9186] [ 52.201719][ T9186] Allocated by task 9186: [ 52.206026][ T9186] ____kasan_kmalloc+0xc2/0xf0 [ 52.210794][ T9186] kmem_cache_alloc_trace+0x21b/0x340 [ 52.216152][ T9186] io_wq_create+0xb6/0xa10 [ 52.220567][ T9186] io_uring_alloc_task_context+0x234/0x520 [ 52.226371][ T9186] __se_sys_io_uring_setup+0x1fff/0x2c30 [ 52.231983][ T9186] do_syscall_64+0x2d/0x70 [ 52.236384][ T9186] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 52.242278][ T9186] [ 52.244583][ T9186] Freed by task 9186: [ 52.248539][ T9186] kasan_set_track+0x3d/0x70 [ 52.253111][ T9186] kasan_set_free_info+0x1f/0x40 [ 52.258028][ T9186] ____kasan_slab_free+0x100/0x140 [ 52.263118][ T9186] slab_free_freelist_hook+0x13a/0x200 [ 52.268556][ T9186] kfree+0xcf/0x2b0 [ 52.272345][ T9186] io_wq_create+0x7dc/0xa10 [ 52.276828][ T9186] io_uring_alloc_task_context+0x234/0x520 [ 52.282612][ T9186] __se_sys_io_uring_setup+0x1fff/0x2c30 [ 52.288225][ T9186] do_syscall_64+0x2d/0x70 [ 52.292619][ T9186] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 52.298495][ T9186] [ 52.300825][ T9186] Last potentially related work creation: [ 52.306530][ T9186] kasan_save_stack+0x27/0x50 [ 52.311186][ T9186] kasan_record_aux_stack+0xee/0x120 [ 52.316453][ T9186] insert_work+0x54/0x400 [ 52.320780][ T9186] __queue_work+0x97f/0xcc0 [ 52.325267][ T9186] queue_work_on+0xb5/0x100 [ 52.329750][ T9186] call_usermodehelper_exec+0x206/0x3d0 [ 52.335276][ T9186] kobject_uevent_env+0x1349/0x1730 [ 52.340459][ T9186] kobject_synth_uevent+0x368/0x8a0 [ 52.345651][ T9186] uevent_store+0x20/0x60 [ 52.349963][ T9186] kernfs_fop_write_iter+0x3b6/0x510 [ 52.355229][ T9186] vfs_write+0x896/0xab0 [ 52.359457][ T9186] ksys_write+0x11b/0x220 [ 52.363765][ T9186] do_syscall_64+0x2d/0x70 [ 52.368158][ T9186] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 52.374034][ T9186] [ 52.376346][ T9186] The buggy address belongs to the object at ffff888011c52800 [ 52.376346][ T9186] which belongs to the cache kmalloc-192 of size 192 [ 52.390396][ T9186] The buggy address is located 152 bytes inside of [ 52.390396][ T9186] 192-byte region [ffff888011c52800, ffff888011c528c0) [ 52.403765][ T9186] The buggy address belongs to the page: [ 52.409372][ T9186] page:0000000047a97f96 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c52 [ 52.419501][ T9186] flags: 0xfff00000000200(slab) [ 52.424364][ T9186] raw: 00fff00000000200 ffffea00008563c0 0000000700000007 ffff888010841a00 [ 52.432925][ T9186] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 52.441482][ T9186] page dumped because: kasan: bad access detected [ 52.447874][ T9186] [ 52.450188][ T9186] Memory state around the buggy address: [ 52.455800][ T9186] ffff888011c52780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 52.463862][ T9186] ffff888011c52800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.471903][ T9186] >ffff888011c52880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 52.479943][ T9186] ^ [ 52.484772][ T9186] ffff888011c52900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 52.492820][ T9186] ffff888011c52980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 52.500873][ T9186] ================================================================== [ 52.508914][ T9186] Disabling lock debugging due to kernel taint [ 52.517933][ T9186] Kernel panic - not syncing: panic_on_warn set ... [ 52.524523][ T9186] CPU: 0 PID: 9186 Comm: syz-executor.0 Tainted: G B 5.12.0-rc1-syzkaller #0 [ 52.534585][ T9186] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.544628][ T9186] Call Trace: [ 52.547897][ T9186] dump_stack+0x125/0x19e [ 52.552214][ T9186] panic+0x291/0x800 [ 52.556090][ T9186] ? trace_hardirqs_on+0x30/0x80 [ 52.561011][ T9186] kasan_report+0x203/0x210 [ 52.565489][ T9186] ? __cpuhp_state_remove_instance+0x251/0x360 [ 52.571618][ T9186] __cpuhp_state_remove_instance+0x251/0x360 [ 52.577573][ T9186] io_wq_create+0x86d/0xa10 [ 52.582059][ T9186] io_uring_alloc_task_context+0x234/0x520 [ 52.587840][ T9186] ? io_free_work+0x30/0x30 [ 52.592316][ T9186] ? tctx_task_work+0x280/0x280 [ 52.597139][ T9186] __se_sys_io_uring_setup+0x1fff/0x2c30 [ 52.602754][ T9186] do_syscall_64+0x2d/0x70 [ 52.607147][ T9186] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 52.613040][ T9186] RIP: 0033:0x465ef9 [ 52.616912][ T9186] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 [ 52.636489][ T9186] RSP: 002b:00007f86cf29c108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 [ 52.644879][ T9186] RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 [ 52.652846][ T9186] RDX: 0000000020f00000 RSI: 0000000020000300 RDI: 00000000000072e8 [ 52.660802][ T9186] RBP: 0000000020000300 R08: 00000000200003c0 R09: 00000000200003c0 [ 52.668752][ T9186] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200003c0 [ 52.676697][ T9186] R13: 0000000020f00000 R14: 0000000000000000 R15: 0000000020d57000 [ 52.685327][ T9186] Kernel Offset: disabled [ 52.689637][ T9186] Rebooting in 86400 seconds..