[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.118410][ T26] audit: type=1800 audit(1559161231.850:25): pid=8950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.177214][ T26] audit: type=1800 audit(1559161231.850:26): pid=8950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.217471][ T26] audit: type=1800 audit(1559161231.860:27): pid=8950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.0.220' (ECDSA) to the list of known hosts. syzkaller login: [ 74.943021][ T9106] IPVS: ftp: loaded support on port[0] = 21 [ 75.013375][ T9106] chnl_net:caif_netlink_parms(): no params data found [ 75.044656][ T9106] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.052804][ T9106] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.061003][ T9106] device bridge_slave_0 entered promiscuous mode [ 75.076271][ T9106] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.083662][ T9106] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.092378][ T9106] device bridge_slave_1 entered promiscuous mode [ 75.110576][ T9106] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 75.120691][ T9106] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 75.139447][ T9106] team0: Port device team_slave_0 added [ 75.146609][ T9106] team0: Port device team_slave_1 added [ 75.199638][ T9106] device hsr_slave_0 entered promiscuous mode [ 75.267430][ T9106] device hsr_slave_1 entered promiscuous mode [ 75.325943][ T9106] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.333199][ T9106] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.341255][ T9106] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.348433][ T9106] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.385681][ T9106] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.400302][ T2990] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.411740][ T2990] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.420594][ T2990] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.429192][ T2990] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.442135][ T9106] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.453519][ T3448] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.462609][ T3448] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.469867][ T3448] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.490259][ T9108] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.499157][ T9108] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.506231][ T9108] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.514975][ T9108] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.525833][ T9108] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.536646][ T3448] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.550291][ T9108] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.563132][ T3448] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.574520][ T9106] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program executing program executing program executing program executing program executing program executing program [ 75.593804][ T9106] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 78.584985][T10083] ================================================================== [ 78.593228][T10083] BUG: KASAN: use-after-free in napi_gro_frags+0xc6f/0xd10 [ 78.600427][T10083] Read of size 2 at addr ffff88809861800c by task syz-executor011/10083 [ 78.608743][T10083] [ 78.611099][T10083] CPU: 0 PID: 10083 Comm: syz-executor011 Not tainted 5.2.0-rc1+ #5 [ 78.619069][T10083] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.629130][T10083] Call Trace: [ 78.632432][T10083] dump_stack+0x172/0x1f0 [ 78.636777][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 78.641642][T10083] print_address_description.cold+0x7c/0x20d [ 78.647635][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 78.652558][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 78.657445][T10083] __kasan_report.cold+0x1b/0x40 [ 78.662397][T10083] ? __kasan_slab_free+0x140/0x150 [ 78.667518][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 78.672408][T10083] kasan_report+0x12/0x20 [ 78.676776][T10083] __asan_report_load_n_noabort+0xf/0x20 [ 78.682434][T10083] napi_gro_frags+0xc6f/0xd10 [ 78.687145][T10083] tun_get_user+0x2f3c/0x3ff0 [ 78.691843][T10083] ? tun_device_event+0xee0/0xee0 [ 78.696873][T10083] ? tun_get+0x171/0x290 [ 78.701127][T10083] ? lock_downgrade+0x880/0x880 [ 78.705994][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.712258][T10083] ? kasan_check_read+0x11/0x20 [ 78.717136][T10083] tun_chr_write_iter+0xbd/0x156 [ 78.722127][T10083] do_iter_readv_writev+0x5f8/0x8f0 [ 78.727339][T10083] ? no_seek_end_llseek_size+0x70/0x70 [ 78.732981][T10083] ? apparmor_file_permission+0x25/0x30 [ 78.738544][T10083] ? rw_verify_area+0x126/0x360 [ 78.743403][T10083] do_iter_write+0x184/0x610 [ 78.747997][T10083] ? dup_iter+0x260/0x260 [ 78.752339][T10083] vfs_writev+0x1b3/0x2f0 [ 78.756677][T10083] ? vfs_iter_write+0xb0/0xb0 [ 78.761368][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.767624][T10083] ? __handle_mm_fault+0x7cb/0x3eb0 [ 78.772840][T10083] ? __do_page_fault+0x623/0xda0 [ 78.777787][T10083] ? __do_page_fault+0x623/0xda0 [ 78.782742][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.788991][T10083] ? __fget_light+0x1a9/0x230 [ 78.793707][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.799962][T10083] do_writev+0x15b/0x330 [ 78.804215][T10083] ? vfs_writev+0x2f0/0x2f0 [ 78.808731][T10083] ? do_syscall_64+0x26/0x680 [ 78.813412][T10083] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.819490][T10083] ? do_syscall_64+0x26/0x680 [ 78.824180][T10083] __x64_sys_writev+0x75/0xb0 [ 78.828876][T10083] do_syscall_64+0xfd/0x680 [ 78.833399][T10083] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.839307][T10083] RIP: 0033:0x4428d0 [ 78.843218][T10083] Code: 05 48 3d 01 f0 ff ff 0f 83 9d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 41 97 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 74 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00 [ 78.862825][T10083] RSP: 002b:00007ffe83fad928 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 78.871262][T10083] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004428d0 [ 78.879243][T10083] RDX: 0000000000000003 RSI: 00007ffe83fad960 RDI: 00000000000000f0 [ 78.887215][T10083] RBP: 00000000000132dd R08: 00007ffe83fad990 R09: 0000000000000003 [ 78.895189][T10083] R10: 0000000000000028 R11: 0000000000000246 R12: 00007ffe83fad960 [ 78.903173][T10083] R13: 0000000000403760 R14: 0000000000000000 R15: 0000000000000000 [ 78.911174][T10083] [ 78.913501][T10083] The buggy address belongs to the page: [ 78.919142][T10083] page:ffffea0002618600 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 [ 78.928510][T10083] flags: 0x1fffc0000000000() [ 78.933113][T10083] raw: 01fffc0000000000 ffffea00024ad608 ffff88812fffc878 0000000000000000 [ 78.941698][T10083] raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 [ 78.950290][T10083] page dumped because: kasan: bad access detected [ 78.956701][T10083] [ 78.959032][T10083] Memory state around the buggy address: [ 78.964671][T10083] ffff888098617f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 78.972742][T10083] ffff888098617f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 78.980808][T10083] >ffff888098618000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 78.988867][T10083] ^ [ 78.994044][T10083] ffff888098618080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 79.003412][T10083] ffff888098618100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 79.011470][T10083] ================================================================== [ 79.019548][T10083] Disabling lock debugging due to kernel taint [ 79.025763][T10083] Kernel panic - not syncing: panic_on_warn set ... [ 79.032400][T10083] CPU: 0 PID: 10083 Comm: syz-executor011 Tainted: G B 5.2.0-rc1+ #5 [ 79.041765][T10083] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.051842][T10083] Call Trace: [ 79.055146][T10083] dump_stack+0x172/0x1f0 [ 79.059484][T10083] panic+0x2cb/0x744 [ 79.063402][T10083] ? __warn_printk+0xf3/0xf3 [ 79.068007][T10083] ? trace_hardirqs_on+0x5e/0x220 [ 79.073039][T10083] ? trace_hardirqs_on+0x5e/0x220 [ 79.078077][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 79.082927][T10083] end_report+0x47/0x4f [ 79.087086][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 79.091945][T10083] __kasan_report.cold+0xe/0x40 [ 79.096798][T10083] ? __kasan_slab_free+0x140/0x150 [ 79.101911][T10083] ? napi_gro_frags+0xc6f/0xd10 [ 79.106772][T10083] kasan_report+0x12/0x20 [ 79.111109][T10083] __asan_report_load_n_noabort+0xf/0x20 [ 79.116747][T10083] napi_gro_frags+0xc6f/0xd10 [ 79.121437][T10083] tun_get_user+0x2f3c/0x3ff0 [ 79.126130][T10083] ? tun_device_event+0xee0/0xee0 [ 79.131156][T10083] ? tun_get+0x171/0x290 [ 79.135430][T10083] ? lock_downgrade+0x880/0x880 [ 79.140295][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.146566][T10083] ? kasan_check_read+0x11/0x20 [ 79.151424][T10083] tun_chr_write_iter+0xbd/0x156 [ 79.156374][T10083] do_iter_readv_writev+0x5f8/0x8f0 [ 79.161585][T10083] ? no_seek_end_llseek_size+0x70/0x70 [ 79.167050][T10083] ? apparmor_file_permission+0x25/0x30 [ 79.172604][T10083] ? rw_verify_area+0x126/0x360 [ 79.177459][T10083] do_iter_write+0x184/0x610 [ 79.182053][T10083] ? dup_iter+0x260/0x260 [ 79.186389][T10083] vfs_writev+0x1b3/0x2f0 [ 79.191806][T10083] ? vfs_iter_write+0xb0/0xb0 [ 79.196499][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.202752][T10083] ? __handle_mm_fault+0x7cb/0x3eb0 [ 79.207971][T10083] ? __do_page_fault+0x623/0xda0 [ 79.212919][T10083] ? __do_page_fault+0x623/0xda0 [ 79.217866][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.224134][T10083] ? __fget_light+0x1a9/0x230 [ 79.228851][T10083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.235107][T10083] do_writev+0x15b/0x330 [ 79.239370][T10083] ? vfs_writev+0x2f0/0x2f0 [ 79.243878][T10083] ? do_syscall_64+0x26/0x680 [ 79.248565][T10083] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.254665][T10083] ? do_syscall_64+0x26/0x680 [ 79.259361][T10083] __x64_sys_writev+0x75/0xb0 [ 79.264046][T10083] do_syscall_64+0xfd/0x680 [ 79.268564][T10083] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.274461][T10083] RIP: 0033:0x4428d0 [ 79.278358][T10083] Code: 05 48 3d 01 f0 ff ff 0f 83 9d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 41 97 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 74 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00 [ 79.297955][T10083] RSP: 002b:00007ffe83fad928 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 79.306363][T10083] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004428d0 [ 79.314375][T10083] RDX: 0000000000000003 RSI: 00007ffe83fad960 RDI: 00000000000000f0 [ 79.322346][T10083] RBP: 00000000000132dd R08: 00007ffe83fad990 R09: 0000000000000003 [ 79.330317][T10083] R10: 0000000000000028 R11: 0000000000000246 R12: 00007ffe83fad960 [ 79.338296][T10083] R13: 0000000000403760 R14: 0000000000000000 R15: 0000000000000000 [ 79.347383][T10083] Kernel Offset: disabled [ 79.351729][T10083] Rebooting in 86400 seconds..