[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.813167][ T26] audit: type=1800 audit(1563498421.744:25): pid=8940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.837794][ T26] audit: type=1800 audit(1563498421.754:26): pid=8940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.899177][ T26] audit: type=1800 audit(1563498421.754:27): pid=8940 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 '10.128.0.55' (ECDSA) to the list of known hosts. 2019/07/19 01:14:26 parsed 1 programs 2019/07/19 01:14:29 executed programs: 0 syzkaller login: [ 510.169243][ T9107] IPVS: ftp: loaded support on port[0] = 21 [ 510.236082][ T9107] chnl_net:caif_netlink_parms(): no params data found [ 510.265106][ T9107] bridge0: port 1(bridge_slave_0) entered blocking state [ 510.273422][ T9107] bridge0: port 1(bridge_slave_0) entered disabled state [ 510.281554][ T9107] device bridge_slave_0 entered promiscuous mode [ 510.290867][ T9107] bridge0: port 2(bridge_slave_1) entered blocking state [ 510.298165][ T9107] bridge0: port 2(bridge_slave_1) entered disabled state [ 510.308503][ T9107] device bridge_slave_1 entered promiscuous mode [ 510.324750][ T9107] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 510.335869][ T9107] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 510.355441][ T9107] team0: Port device team_slave_0 added [ 510.363097][ T9107] team0: Port device team_slave_1 added [ 510.439093][ T9107] device hsr_slave_0 entered promiscuous mode [ 510.496718][ T9107] device hsr_slave_1 entered promiscuous mode [ 510.564749][ T9107] bridge0: port 2(bridge_slave_1) entered blocking state [ 510.571995][ T9107] bridge0: port 2(bridge_slave_1) entered forwarding state [ 510.580020][ T9107] bridge0: port 1(bridge_slave_0) entered blocking state [ 510.587252][ T9107] bridge0: port 1(bridge_slave_0) entered forwarding state [ 510.622738][ T9107] 8021q: adding VLAN 0 to HW filter on device bond0 [ 510.635653][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 510.657698][ T9109] bridge0: port 1(bridge_slave_0) entered disabled state [ 510.667281][ T9109] bridge0: port 2(bridge_slave_1) entered disabled state [ 510.675784][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 510.688105][ T9107] 8021q: adding VLAN 0 to HW filter on device team0 [ 510.704810][ T2870] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 510.713759][ T2870] bridge0: port 1(bridge_slave_0) entered blocking state [ 510.720927][ T2870] bridge0: port 1(bridge_slave_0) entered forwarding state [ 510.732193][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 510.740924][ T9109] bridge0: port 2(bridge_slave_1) entered blocking state [ 510.748042][ T9109] bridge0: port 2(bridge_slave_1) entered forwarding state [ 510.768537][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 510.778063][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 510.793426][ T9107] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 510.804129][ T9107] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 510.818103][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 510.826953][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 510.835671][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 510.844254][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 510.863300][ T9107] 8021q: adding VLAN 0 to HW filter on device batadv0 2019/07/19 01:14:34 executed programs: 7 2019/07/19 01:14:39 executed programs: 14 [ 526.648220][ T9266] ================================================================== [ 526.656427][ T9266] BUG: KASAN: use-after-free in tlb_finish_mmu+0x136/0x3b0 [ 526.663746][ T9266] Write of size 4 at addr ffff8880912433f4 by task syz-executor.0/9266 [ 526.671968][ T9266] [ 526.674292][ T9266] CPU: 1 PID: 9266 Comm: syz-executor.0 Not tainted 5.2.0+ #61 [ 526.681814][ T9266] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 526.691958][ T9266] Call Trace: [ 526.695331][ T9266] dump_stack+0x172/0x1f0 [ 526.699659][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 526.704549][ T9266] print_address_description.cold+0xd4/0x306 [ 526.710534][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 526.715375][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 526.720222][ T9266] __kasan_report.cold+0x1b/0x36 [ 526.725265][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 526.730193][ T9266] kasan_report+0x12/0x17 [ 526.734515][ T9266] check_memory_region+0x134/0x1a0 [ 526.739702][ T9266] __kasan_check_write+0x14/0x20 [ 526.744719][ T9266] tlb_finish_mmu+0x136/0x3b0 [ 526.749419][ T9266] exit_mmap+0x2da/0x530 [ 526.753654][ T9266] ? __ia32_sys_munmap+0x80/0x80 [ 526.758591][ T9266] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 526.764839][ T9266] ? __khugepaged_exit+0xcf/0x410 [ 526.769864][ T9266] mmput+0x179/0x4d0 [ 526.773855][ T9266] do_exit+0x84e/0x2ea0 [ 526.778032][ T9266] ? mm_update_next_owner+0x640/0x640 [ 526.783491][ T9266] ? lock_downgrade+0x920/0x920 [ 526.788341][ T9266] ? _raw_spin_unlock_irq+0x28/0x90 [ 526.793528][ T9266] ? get_signal+0x392/0x2500 [ 526.798199][ T9266] ? _raw_spin_unlock_irq+0x28/0x90 [ 526.803479][ T9266] do_group_exit+0x135/0x360 [ 526.808066][ T9266] get_signal+0x47c/0x2500 [ 526.812474][ T9266] ? mutex_unlock+0xd/0x10 [ 526.816888][ T9266] do_signal+0x87/0x1670 [ 526.821122][ T9266] ? vhost_zerocopy_callback+0x300/0x300 [ 526.826743][ T9266] ? __fget+0x384/0x560 [ 526.831233][ T9266] ? setup_sigcontext+0x7d0/0x7d0 [ 526.836357][ T9266] ? kick_process+0xef/0x180 [ 526.840941][ T9266] ? task_work_add+0x9c/0x120 [ 526.845614][ T9266] ? exit_to_usermode_loop+0x43/0x380 [ 526.851260][ T9266] ? do_fast_syscall_32+0xb87/0xdb3 [ 526.856464][ T9266] ? exit_to_usermode_loop+0x43/0x380 [ 526.861833][ T9266] ? lockdep_hardirqs_on+0x418/0x5d0 [ 526.867106][ T9266] ? trace_hardirqs_on+0x67/0x240 [ 526.872125][ T9266] exit_to_usermode_loop+0x286/0x380 [ 526.877529][ T9266] do_fast_syscall_32+0xb87/0xdb3 [ 526.882768][ T9266] entry_SYSENTER_compat+0x70/0x7f [ 526.887969][ T9266] RIP: 0023:0xf7f139c9 [ 526.892035][ T9266] Code: d3 83 c4 10 5b 5e 5d c3 ba 80 96 98 00 eb a9 8b 04 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 526.911632][ T9266] RSP: 002b:00000000f7eee0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 [ 526.920097][ T9266] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000004028af11 [ 526.928201][ T9266] RDX: 00000000200023c0 RSI: 0000000000000000 RDI: 0000000000000000 [ 526.936262][ T9266] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 526.944246][ T9266] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 526.952645][ T9266] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 526.960670][ T9266] [ 526.962993][ T9266] Allocated by task 9107: [ 526.967321][ T9266] save_stack+0x23/0x90 [ 526.971506][ T9266] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 526.977319][ T9266] kasan_slab_alloc+0xf/0x20 [ 526.981910][ T9266] kmem_cache_alloc+0x121/0x710 [ 526.986747][ T9266] dup_mm+0x8a/0x1430 [ 526.990725][ T9266] copy_process+0x28b7/0x6b00 [ 526.995389][ T9266] _do_fork+0x146/0xfa0 [ 526.999564][ T9266] __ia32_compat_sys_x86_clone+0x188/0x260 [ 527.005363][ T9266] do_fast_syscall_32+0x27b/0xdb3 [ 527.010383][ T9266] entry_SYSENTER_compat+0x70/0x7f [ 527.015520][ T9266] [ 527.017876][ T9266] Freed by task 9107: [ 527.022126][ T9266] save_stack+0x23/0x90 [ 527.026271][ T9266] __kasan_slab_free+0x102/0x150 [ 527.031207][ T9266] kasan_slab_free+0xe/0x10 [ 527.035705][ T9266] kmem_cache_free+0x86/0x320 [ 527.040368][ T9266] __mmdrop+0x238/0x320 [ 527.044519][ T9266] finish_task_switch+0x457/0x720 [ 527.049532][ T9266] __schedule+0x75d/0x1580 [ 527.053939][ T9266] schedule+0xa8/0x270 [ 527.058002][ T9266] do_nanosleep+0x201/0x6a0 [ 527.062498][ T9266] hrtimer_nanosleep+0x2a6/0x570 [ 527.067459][ T9266] __ia32_sys_nanosleep_time32+0x1ad/0x230 [ 527.073265][ T9266] do_fast_syscall_32+0x27b/0xdb3 [ 527.078294][ T9266] entry_SYSENTER_compat+0x70/0x7f [ 527.083385][ T9266] [ 527.085726][ T9266] The buggy address belongs to the object at ffff888091242e80 [ 527.085726][ T9266] which belongs to the cache mm_struct(17:syz0) of size 1496 [ 527.100467][ T9266] The buggy address is located 1396 bytes inside of [ 527.100467][ T9266] 1496-byte region [ffff888091242e80, ffff888091243458) [ 527.113986][ T9266] The buggy address belongs to the page: [ 527.119663][ T9266] page:ffffea0002449080 refcount:1 mapcount:0 mapping:ffff88809b48b700 index:0x0 compound_mapcount: 0 [ 527.130733][ T9266] flags: 0x1fffc0000010200(slab|head) [ 527.136099][ T9266] raw: 01fffc0000010200 ffffea00021bb308 ffff8880a1533a48 ffff88809b48b700 [ 527.145016][ T9266] raw: 0000000000000000 ffff888091242180 0000000100000004 0000000000000000 [ 527.153621][ T9266] page dumped because: kasan: bad access detected [ 527.160251][ T9266] [ 527.162564][ T9266] Memory state around the buggy address: [ 527.168183][ T9266] ffff888091243280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 527.176241][ T9266] ffff888091243300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 527.184301][ T9266] >ffff888091243380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 527.192339][ T9266] ^ [ 527.200051][ T9266] ffff888091243400: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc [ 527.208163][ T9266] ffff888091243480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 527.216221][ T9266] ================================================================== [ 527.224438][ T9266] Disabling lock debugging due to kernel taint [ 527.232132][ T9266] Kernel panic - not syncing: panic_on_warn set ... [ 527.238775][ T9266] CPU: 1 PID: 9266 Comm: syz-executor.0 Tainted: G B 5.2.0+ #61 [ 527.247892][ T9266] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 527.257973][ T9266] Call Trace: [ 527.261427][ T9266] dump_stack+0x172/0x1f0 [ 527.265750][ T9266] panic+0x2dc/0x755 [ 527.269636][ T9266] ? add_taint.cold+0x16/0x16 [ 527.274439][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 527.279301][ T9266] ? preempt_schedule+0x4b/0x60 [ 527.284227][ T9266] ? ___preempt_schedule+0x16/0x18 [ 527.289333][ T9266] ? trace_hardirqs_on+0x5e/0x240 [ 527.294347][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 527.299233][ T9266] end_report+0x47/0x4f [ 527.303377][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 527.308217][ T9266] __kasan_report.cold+0xe/0x36 [ 527.313056][ T9266] ? tlb_finish_mmu+0x136/0x3b0 [ 527.317896][ T9266] kasan_report+0x12/0x17 [ 527.322357][ T9266] check_memory_region+0x134/0x1a0 [ 527.333796][ T9266] __kasan_check_write+0x14/0x20 [ 527.338776][ T9266] tlb_finish_mmu+0x136/0x3b0 [ 527.343447][ T9266] exit_mmap+0x2da/0x530 [ 527.347788][ T9266] ? __ia32_sys_munmap+0x80/0x80 [ 527.352715][ T9266] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 527.358944][ T9266] ? __khugepaged_exit+0xcf/0x410 [ 527.363970][ T9266] mmput+0x179/0x4d0 [ 527.367954][ T9266] do_exit+0x84e/0x2ea0 [ 527.372220][ T9266] ? mm_update_next_owner+0x640/0x640 [ 527.377582][ T9266] ? lock_downgrade+0x920/0x920 [ 527.382422][ T9266] ? _raw_spin_unlock_irq+0x28/0x90 [ 527.387616][ T9266] ? get_signal+0x392/0x2500 [ 527.392229][ T9266] ? _raw_spin_unlock_irq+0x28/0x90 [ 527.397622][ T9266] do_group_exit+0x135/0x360 [ 527.402197][ T9266] get_signal+0x47c/0x2500 [ 527.406605][ T9266] ? mutex_unlock+0xd/0x10 [ 527.411054][ T9266] do_signal+0x87/0x1670 [ 527.415295][ T9266] ? vhost_zerocopy_callback+0x300/0x300 [ 527.421066][ T9266] ? __fget+0x384/0x560 [ 527.425338][ T9266] ? setup_sigcontext+0x7d0/0x7d0 [ 527.430382][ T9266] ? kick_process+0xef/0x180 [ 527.434962][ T9266] ? task_work_add+0x9c/0x120 [ 527.439659][ T9266] ? exit_to_usermode_loop+0x43/0x380 [ 527.445015][ T9266] ? do_fast_syscall_32+0xb87/0xdb3 [ 527.450197][ T9266] ? exit_to_usermode_loop+0x43/0x380 [ 527.455765][ T9266] ? lockdep_hardirqs_on+0x418/0x5d0 [ 527.461054][ T9266] ? trace_hardirqs_on+0x67/0x240 [ 527.466102][ T9266] exit_to_usermode_loop+0x286/0x380 [ 527.471475][ T9266] do_fast_syscall_32+0xb87/0xdb3 [ 527.476491][ T9266] entry_SYSENTER_compat+0x70/0x7f [ 527.481623][ T9266] RIP: 0023:0xf7f139c9 [ 527.485827][ T9266] Code: d3 83 c4 10 5b 5e 5d c3 ba 80 96 98 00 eb a9 8b 04 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 527.505666][ T9266] RSP: 002b:00000000f7eee0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 [ 527.514093][ T9266] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000004028af11 [ 527.522074][ T9266] RDX: 00000000200023c0 RSI: 0000000000000000 RDI: 0000000000000000 [ 527.530036][ T9266] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 527.537996][ T9266] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 527.545995][ T9266] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 527.555092][ T9266] Kernel Offset: disabled [ 527.559417][ T9266] Rebooting in 86400 seconds..