[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.070067][ T27] audit: type=1800 audit(1583432569.256:25): pid=8943 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.089896][ T27] audit: type=1800 audit(1583432569.266:26): pid=8943 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.110403][ T27] audit: type=1800 audit(1583432569.266:27): pid=8943 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 '10.128.1.62' (ECDSA) to the list of known hosts. 2020/03/05 18:39:08 parsed 1 programs 2020/03/05 18:39:10 executed programs: 0 syzkaller login: [ 1039.497124][ T9112] IPVS: ftp: loaded support on port[0] = 21 [ 1039.548590][ T9112] chnl_net:caif_netlink_parms(): no params data found [ 1039.582904][ T9112] bridge0: port 1(bridge_slave_0) entered blocking state [ 1039.590497][ T9112] bridge0: port 1(bridge_slave_0) entered disabled state [ 1039.598575][ T9112] device bridge_slave_0 entered promiscuous mode [ 1039.607052][ T9112] bridge0: port 2(bridge_slave_1) entered blocking state [ 1039.614173][ T9112] bridge0: port 2(bridge_slave_1) entered disabled state [ 1039.622095][ T9112] device bridge_slave_1 entered promiscuous mode [ 1039.638726][ T9112] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1039.649506][ T9112] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1039.667737][ T9112] team0: Port device team_slave_0 added [ 1039.675673][ T9112] team0: Port device team_slave_1 added [ 1039.689554][ T9112] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1039.696968][ T9112] 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. [ 1039.723030][ T9112] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1039.736184][ T9112] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1039.743321][ T9112] 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. [ 1039.770512][ T9112] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1039.826731][ T9112] device hsr_slave_0 entered promiscuous mode [ 1039.864930][ T9112] device hsr_slave_1 entered promiscuous mode [ 1039.979478][ T9112] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1040.037252][ T9112] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1040.097119][ T9112] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1040.136710][ T9112] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1040.198047][ T9112] bridge0: port 2(bridge_slave_1) entered blocking state [ 1040.205296][ T9112] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1040.213169][ T9112] bridge0: port 1(bridge_slave_0) entered blocking state [ 1040.220352][ T9112] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1040.259930][ T9112] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1040.272888][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1040.283461][ T2887] bridge0: port 1(bridge_slave_0) entered disabled state [ 1040.292169][ T2887] bridge0: port 2(bridge_slave_1) entered disabled state [ 1040.300312][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1040.318776][ T9112] 8021q: adding VLAN 0 to HW filter on device team0 [ 1040.339914][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1040.348464][ T2890] bridge0: port 1(bridge_slave_0) entered blocking state [ 1040.355919][ T2890] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1040.375117][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1040.383514][ T2890] bridge0: port 2(bridge_slave_1) entered blocking state [ 1040.390616][ T2890] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1040.398853][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1040.408304][ T2873] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1040.418590][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1040.431341][ T2873] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1040.443490][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1040.454314][ T9112] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1040.472086][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1040.480083][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1040.492735][ T9112] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1040.510534][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1040.530106][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1040.538867][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1040.548244][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1040.559443][ T9112] device veth0_vlan entered promiscuous mode [ 1040.571454][ T9112] device veth1_vlan entered promiscuous mode [ 1040.597154][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1040.606579][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1040.617878][ T9112] device veth0_macvtap entered promiscuous mode [ 1040.632016][ T9112] device veth1_macvtap entered promiscuous mode [ 1040.648569][ T9112] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1040.656202][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1040.664266][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1040.672486][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1040.681868][ T2887] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1040.693878][ T9112] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1040.702545][ T2873] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1040.711676][ T2873] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1041.012857][ T9138] ================================================================== [ 1041.021917][ T9138] BUG: KASAN: use-after-free in __list_add_valid+0x58/0xc0 [ 1041.031507][ T9138] Read of size 8 at addr ffff88809788b1e0 by task syz-executor.0/9138 [ 1041.040506][ T9138] [ 1041.042864][ T9138] CPU: 1 PID: 9138 Comm: syz-executor.0 Not tainted 5.6.0-rc3-syzkaller #0 [ 1041.051543][ T9138] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1041.061720][ T9138] Call Trace: [ 1041.065449][ T9138] dump_stack+0x1fb/0x318 [ 1041.070198][ T9138] print_address_description+0x74/0x5c0 [ 1041.075795][ T9138] ? vprintk_default+0x28/0x30 [ 1041.080580][ T9138] ? vprintk_func+0x158/0x170 [ 1041.085332][ T9138] ? printk+0x62/0x8d [ 1041.089531][ T9138] __kasan_report+0x149/0x1c0 [ 1041.094496][ T9138] ? __list_add_valid+0x58/0xc0 [ 1041.099515][ T9138] kasan_report+0x26/0x50 [ 1041.104072][ T9138] __asan_report_load8_noabort+0x14/0x20 [ 1041.109846][ T9138] __list_add_valid+0x58/0xc0 [ 1041.114648][ T9138] rdma_listen+0x322/0x9a0 [ 1041.119146][ T9138] ucma_listen+0x245/0x300 [ 1041.123713][ T9138] ? __kasan_check_write+0x14/0x20 [ 1041.128874][ T9138] ? ucma_connect+0x7e0/0x7e0 [ 1041.133674][ T9138] ucma_write+0x2da/0x360 [ 1041.138017][ T9138] ? ucma_get_global_nl_info+0x70/0x70 [ 1041.144241][ T9138] __vfs_write+0xb8/0x740 [ 1041.148902][ T9138] ? security_file_permission+0x147/0x340 [ 1041.154745][ T9138] ? rw_verify_area+0x1c2/0x360 [ 1041.159817][ T9138] vfs_write+0x270/0x580 [ 1041.164063][ T9138] ksys_write+0x117/0x220 [ 1041.168391][ T9138] __x64_sys_write+0x7b/0x90 [ 1041.173044][ T9138] do_syscall_64+0xf7/0x1c0 [ 1041.177750][ T9138] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.183635][ T9138] RIP: 0033:0x45c479 [ 1041.187562][ T9138] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1041.207283][ T9138] RSP: 002b:00007effc11e8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1041.215710][ T9138] RAX: ffffffffffffffda RBX: 00007effc11e96d4 RCX: 000000000045c479 [ 1041.223697][ T9138] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 1041.231771][ T9138] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 1041.239781][ T9138] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1041.247759][ T9138] R13: 0000000000000cbe R14: 00000000004cea34 R15: 000000000076bf2c [ 1041.255737][ T9138] [ 1041.258063][ T9138] Allocated by task 9131: [ 1041.262393][ T9138] __kasan_kmalloc+0x118/0x1c0 [ 1041.267172][ T9138] kasan_kmalloc+0x9/0x10 [ 1041.272251][ T9138] kmem_cache_alloc_trace+0x221/0x2f0 [ 1041.277631][ T9138] __rdma_create_id+0x66/0x4f0 [ 1041.282407][ T9138] ucma_create_id+0x253/0x540 [ 1041.287117][ T9138] ucma_write+0x2da/0x360 [ 1041.291451][ T9138] __vfs_write+0xb8/0x740 [ 1041.295776][ T9138] vfs_write+0x270/0x580 [ 1041.300012][ T9138] ksys_write+0x117/0x220 [ 1041.304345][ T9138] __x64_sys_write+0x7b/0x90 [ 1041.308939][ T9138] do_syscall_64+0xf7/0x1c0 [ 1041.313609][ T9138] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.320047][ T9138] [ 1041.322373][ T9138] Freed by task 9131: [ 1041.326350][ T9138] __kasan_slab_free+0x12e/0x1e0 [ 1041.331459][ T9138] kasan_slab_free+0xe/0x10 [ 1041.336336][ T9138] kfree+0x10d/0x220 [ 1041.340281][ T9138] rdma_destroy_id+0xf72/0x1160 [ 1041.345992][ T9138] ucma_close+0x1eb/0x2d0 [ 1041.350489][ T9138] __fput+0x2e4/0x740 [ 1041.354567][ T9138] ____fput+0x15/0x20 [ 1041.358605][ T9138] task_work_run+0x176/0x1b0 [ 1041.364122][ T9138] prepare_exit_to_usermode+0x480/0x5b0 [ 1041.369763][ T9138] syscall_return_slowpath+0x113/0x4a0 [ 1041.376166][ T9138] do_syscall_64+0x11f/0x1c0 [ 1041.380839][ T9138] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.386887][ T9138] [ 1041.389201][ T9138] The buggy address belongs to the object at ffff88809788b000 [ 1041.389201][ T9138] which belongs to the cache kmalloc-2k of size 2048 [ 1041.403253][ T9138] The buggy address is located 480 bytes inside of [ 1041.403253][ T9138] 2048-byte region [ffff88809788b000, ffff88809788b800) [ 1041.416726][ T9138] The buggy address belongs to the page: [ 1041.422359][ T9138] page:ffffea00025e22c0 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 1041.431545][ T9138] flags: 0xfffe0000000200(slab) [ 1041.436405][ T9138] raw: 00fffe0000000200 ffffea0002437608 ffffea0002a00b48 ffff8880aa400e00 [ 1041.445083][ T9138] raw: 0000000000000000 ffff88809788b000 0000000100000001 0000000000000000 [ 1041.453699][ T9138] page dumped because: kasan: bad access detected [ 1041.460117][ T9138] [ 1041.462484][ T9138] Memory state around the buggy address: [ 1041.468114][ T9138] ffff88809788b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.476185][ T9138] ffff88809788b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.484254][ T9138] >ffff88809788b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.492305][ T9138] ^ [ 1041.499585][ T9138] ffff88809788b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.507657][ T9138] ffff88809788b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.515709][ T9138] ================================================================== [ 1041.523760][ T9138] Disabling lock debugging due to kernel taint [ 1041.533723][ T9138] Kernel panic - not syncing: panic_on_warn set ... [ 1041.540422][ T9138] CPU: 1 PID: 9138 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 1041.550996][ T9138] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1041.561277][ T9138] Call Trace: [ 1041.564559][ T9138] dump_stack+0x1fb/0x318 [ 1041.569016][ T9138] panic+0x264/0x7a9 [ 1041.572902][ T9138] ? __kasan_report+0x193/0x1c0 [ 1041.577859][ T9138] ? trace_hardirqs_on+0x34/0x80 [ 1041.582797][ T9138] ? __kasan_report+0x193/0x1c0 [ 1041.587637][ T9138] __kasan_report+0x1b9/0x1c0 [ 1041.592306][ T9138] ? __list_add_valid+0x58/0xc0 [ 1041.597161][ T9138] kasan_report+0x26/0x50 [ 1041.601513][ T9138] __asan_report_load8_noabort+0x14/0x20 [ 1041.607232][ T9138] __list_add_valid+0x58/0xc0 [ 1041.611982][ T9138] rdma_listen+0x322/0x9a0 [ 1041.616411][ T9138] ucma_listen+0x245/0x300 [ 1041.620989][ T9138] ? __kasan_check_write+0x14/0x20 [ 1041.626212][ T9138] ? ucma_connect+0x7e0/0x7e0 [ 1041.631010][ T9138] ucma_write+0x2da/0x360 [ 1041.635447][ T9138] ? ucma_get_global_nl_info+0x70/0x70 [ 1041.642207][ T9138] __vfs_write+0xb8/0x740 [ 1041.646559][ T9138] ? security_file_permission+0x147/0x340 [ 1041.652297][ T9138] ? rw_verify_area+0x1c2/0x360 [ 1041.657191][ T9138] vfs_write+0x270/0x580 [ 1041.661643][ T9138] ksys_write+0x117/0x220 [ 1041.666093][ T9138] __x64_sys_write+0x7b/0x90 [ 1041.670793][ T9138] do_syscall_64+0xf7/0x1c0 [ 1041.675321][ T9138] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.681245][ T9138] RIP: 0033:0x45c479 [ 1041.685125][ T9138] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1041.704934][ T9138] RSP: 002b:00007effc11e8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1041.713765][ T9138] RAX: ffffffffffffffda RBX: 00007effc11e96d4 RCX: 000000000045c479 [ 1041.721740][ T9138] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 1041.729897][ T9138] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 1041.738124][ T9138] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1041.746089][ T9138] R13: 0000000000000cbe R14: 00000000004cea34 R15: 000000000076bf2c [ 1041.755192][ T9138] Kernel Offset: disabled [ 1041.759536][ T9138] Rebooting in 86400 seconds..