Starting mcstransd: [ 20.810843] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.920527] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.324259] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.280743] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. executing program [ 31.008124] ================================================================== [ 31.015523] BUG: KASAN: use-after-free in ip6_xmit+0x1a2c/0x1a70 [ 31.021651] Read of size 8 at addr ffff8801d487e3d8 by task syzkaller306006/3765 [ 31.029162] [ 31.030788] CPU: 1 PID: 3765 Comm: syzkaller306006 Not tainted 4.4.120-gd63fdf6 #28 [ 31.030791] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.030800] 0000000000000000 e99685ed58ae712c ffff8800ad4d77e0 ffffffff81d0408d [ 31.030807] ffffea0007521f80 ffff8801d487e3d8 0000000000000000 ffff8801d487e3d8 [ 31.030815] 0000000000000040 ffff8800ad4d7818 ffffffff814fe143 ffff8801d487e3d8 [ 31.030816] Call Trace: [ 31.030827] [] dump_stack+0xc1/0x124 [ 31.030836] [] print_address_description+0x73/0x260 [ 31.030842] [] kasan_report+0x285/0x370 [ 31.030850] [] ? ip6_xmit+0x1a2c/0x1a70 [ 31.030856] [] __asan_report_load8_noabort+0x14/0x20 [ 31.030863] [] ip6_xmit+0x1a2c/0x1a70 [ 31.030870] [] ? kfree+0xfc/0x300 [ 31.030878] [] ? pskb_expand_head+0x28b/0x980 [ 31.030885] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 31.030893] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 31.030901] [] ? __lock_is_held+0xa1/0xf0 [ 31.030909] [] ? ipv4_dst_check+0x111/0x160 [ 31.030916] [] ? __sk_dst_check+0x148/0x260 [ 31.030927] [] inet6_csk_xmit+0x246/0x480 [ 31.030932] [] ? inet6_csk_xmit+0x100/0x480 [ 31.030939] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 31.030945] [] ? udp6_set_csum+0x336/0xa80 [ 31.030950] [] l2tp_xmit_skb+0xc2f/0xea0 [ 31.030955] [] pppol2tp_sendmsg+0x584/0x7f0 [ 31.030963] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 31.030968] [] ? pppol2tp_release+0x310/0x310 [ 31.030974] [] sock_sendmsg+0xca/0x110 [ 31.030980] [] SYSC_sendto+0x2c8/0x340 [ 31.030986] [] ? SYSC_connect+0x310/0x310 [ 31.030993] [] ? lock_sock_nested+0xdc/0x120 [ 31.030998] [] ? ip6_datagram_connect+0x3a/0x50 [ 31.031007] [] ? inet_dgram_connect+0x172/0x1f0 [ 31.031013] [] ? SYSC_connect+0x212/0x310 [ 31.031021] [] ? retint_user+0x18/0x3c [ 31.031027] [] SyS_sendto+0x40/0x50 [ 31.031033] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 31.031035] [ 31.031038] Allocated by task 3752: [ 31.031048] [] save_stack_trace+0x26/0x50 [ 31.031055] [] save_stack+0x43/0xd0 [ 31.031061] [] kasan_kmalloc+0xad/0xe0 [ 31.031066] [] kasan_slab_alloc+0x12/0x20 [ 31.031073] [] kmem_cache_alloc+0xba/0x290 [ 31.031079] [] dst_alloc+0x11f/0x1a0 [ 31.031086] [] rt_dst_alloc+0x78/0x430 [ 31.031093] [] __ip_route_output_key_hash+0xa4e/0x2390 [ 31.031101] [] __ip4_datagram_connect+0xa15/0x1150 [ 31.031107] [] __ip6_datagram_connect+0x4d9/0x1950 [ 31.031113] [] ip6_datagram_connect+0x2f/0x50 [ 31.031119] [] inet_dgram_connect+0x16b/0x1f0 [ 31.031126] [] SYSC_connect+0x1b6/0x310 [ 31.031132] [] SyS_connect+0x24/0x30 [ 31.031139] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 31.031140] [ 31.031142] Freed by task 0: [ 31.031148] [] save_stack_trace+0x26/0x50 [ 31.031155] [] save_stack+0x43/0xd0 [ 31.031161] [] kasan_slab_free+0x72/0xc0 [ 31.031167] [] kmem_cache_free+0xc7/0x320 [ 31.031173] [] dst_destroy+0x20e/0x330 [ 31.031179] [] dst_destroy_rcu+0x15/0x40 [ 31.031185] [] rcu_process_callbacks+0x7f4/0x14a0 [ 31.031192] [] __do_softirq+0x227/0xa38 [ 31.031193] [ 31.031197] The buggy address belongs to the object at ffff8801d487e3c0 [ 31.031197] which belongs to the cache ip_dst_cache of size 208 [ 31.031202] The buggy address is located 24 bytes inside of [ 31.031202] 208-byte region [ffff8801d487e3c0, ffff8801d487e490) [ 31.031204] The buggy address belongs to the page: [ 31.048197] INFO: trying to register non-static key. [ 31.048199] the code is fine but needs lockdep annotation. [ 31.048200] turning off the locking correctness validator. [ 31.048208] CPU: 0 PID: 3766 Comm: init Not tainted 4.4.120-gd63fdf6 #28 [ 31.048211] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.048219] 0000000000000000 4d7c7077c580dec6 ffff8800addefa20 ffffffff81d0408d [ 31.048224] ffffffff85153f60 0000000000000000 ffff8801c66e3000 ffff8800ab807dd8 [ 31.048230] 0000000000000000 ffff8800addefa30 ffffffff8141adb3 ffff8800addefbd8 [ 31.048232] Call Trace: [ 31.048244] [] dump_stack+0xc1/0x124 [ 31.048253] [] register_lock_class.part.26+0x32/0x36 [ 31.048261] [] __lock_acquire+0x3a49/0x4b50 [ 31.048267] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 31.048274] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 31.048280] [] ? __lock_is_held+0xa1/0xf0 [ 31.048286] [] lock_acquire+0x15e/0x460 [ 31.048294] [] ? handle_mm_fault+0x1f52/0x3190 [ 31.048301] [] _raw_spin_lock+0x36/0x50 [ 31.048307] [] ? handle_mm_fault+0x1f52/0x3190 [ 31.048313] [] handle_mm_fault+0x1f52/0x3190 [ 31.048319] [] ? copy_page_range+0x1480/0x1480 [ 31.048325] [] ? memset+0x31/0x40 [ 31.048330] [] ? vmacache_find+0x57/0x290 [ 31.048335] [] ? vmacache_update+0xfe/0x130 [ 31.048343] [] __do_page_fault+0x35b/0xa00 [ 31.048349] [] do_page_fault+0x27/0x30 [ 31.048355] [] page_fault+0x28/0x30 [ 31.048364] [] ? __put_user_4+0x20/0x30 [ 31.048371] [] ? schedule_tail+0xd8/0x120 [ 31.048377] [] ret_from_fork+0xf/0x80 [ 31.209035] ------------[ cut here ]------------ [ 31.209042] kernel BUG at include/linux/mm.h:460! [ 31.209050] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 31.209054] Dumping ftrace buffer: [ 31.209057] (ftrace buffer empty) [ 31.209060] Modules linked in: [ 31.209067] CPU: 0 PID: 3766 Comm: init Not tainted 4.4.120-gd63fdf6 #28 [ 31.209070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.209073] task: ffff8801c66e3000 task.stack: ffff8800adde8000 [ 31.209088] RIP: 0010:[] [] dump_page_badflags+0x191/0x250 [ 31.209092] RSP: 0018:ffff8801db207d18 EFLAGS: 00010206 [ 31.209095] RAX: ffffffff814909c1 RBX: ffff8801db207d68 RCX: ffffffff812a0eeb [ 31.209099] RDX: 0000000000000100 RSI: ffffffff847ebf78 RDI: ffff8800ab841500 [ 31.209102] RBP: ffff8801db207df0 R08: 0000000000000000 R09: 0000000000000000 [ 31.209105] R10: ffffffff838444e0 R11: 1ffff1003b640f70 R12: 1ffff1003b640fa9 [ 31.209109] R13: ffff8800ab841ab0 R14: 0000000000000102 R15: ffffffff838444e0 [ 31.209114] FS: 00007fe5fe5747a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.209117] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.209121] CR2: 00007fe5fe574a70 CR3: 00000000af730000 CR4: 0000000000160670 [ 31.209127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.209130] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.209131] Stack: [ 31.209138] ffffffff812a0efb ffffffff812a0e4c 0000000000000000 ffffffff842c35a0 [ 31.209145] ffff8800ab841500 ffffffff814909c1 0000000041b58ab3 ffffffff83faab59 [ 31.209151] ffffffff812a0d70 ffffffff812a2952 ffff8800ab841b40 0000000000000000 [ 31.209153] Call Trace: [ 31.209163] [ 31.209163] [] ? call_timer_fn+0x18b/0x860 [ 31.209168] [] ? call_timer_fn+0xdc/0x860 [ 31.209174] [] ? dump_page_badflags+0x191/0x250 [ 31.209180] [] ? process_timeout+0x20/0x20 [ 31.209185] [] ? run_timer_softirq+0x102/0xbb0 [ 31.209191] [] ? run_timer_softirq+0x5f2/0xbb0 [ 31.209197] [] ? dump_page_badflags+0x191/0x250 [ 31.209202] [] run_timer_softirq+0x604/0xbb0 [ 31.209209] [] ? kvm_clock_read+0x23/0x40 [ 31.209215] [] ? msleep+0xc0/0xc0 [ 31.209222] [] ? check_preemption_disabled+0x3b/0x200 [ 31.209230] [] __do_softirq+0x227/0xa38 [ 31.209238] [] irq_exit+0x119/0x140 [ 31.209244] [] smp_apic_timer_interrupt+0x7b/0xa0 [ 31.209250] [] apic_timer_interrupt+0xa0/0xb0 [ 31.209257] [ 31.209258] [] ? check_preemption_disabled+0x3b/0x200 [ 31.209265] [] ? delay_tsc+0x25/0xc0 [ 31.209270] [] ? delay_tsc+0x1d/0xc0 [ 31.209275] [] __delay+0xa/0x10 [ 31.209282] [] do_raw_spin_lock+0x151/0x2c0 [ 31.209287] [] _raw_spin_lock+0x3e/0x50 [ 31.209293] [] ? handle_mm_fault+0x1f52/0x3190 [ 31.209299] [] handle_mm_fault+0x1f52/0x3190 [ 31.209305] [] ? copy_page_range+0x1480/0x1480 [ 31.209310] [] ? memset+0x31/0x40 [ 31.209315] [] ? vmacache_find+0x57/0x290 [ 31.209320] [] ? vmacache_update+0xfe/0x130 [ 31.209327] [] __do_page_fault+0x35b/0xa00 [ 31.209332] [] do_page_fault+0x27/0x30 [ 31.209337] [] page_fault+0x28/0x30 [ 31.209344] [] ? __put_user_4+0x20/0x30 [ 31.209350] [] ? schedule_tail+0xd8/0x120 [ 31.209355] [] ret_from_fork+0xf/0x80 [ 31.209436] Code: 46 e8 b4 03 ed ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a0 03 ed ff 31 d2 48 c7 c6 60 90 8a 83 48 89 df e8 6f fe ff ff <0f> 0b e8 b8 dd 06 00 e9 21 ff ff ff 89 4d d4 e8 ab dd 06 00 8b [ 31.209443] RIP [] dump_page_badflags+0x191/0x250 [ 31.209445] RSP [ 31.209452] ---[ end trace b432bd2acd085a21 ]--- [ 31.209457] Kernel panic - not syncing: Fatal exception in interrupt [ 32.338407] Shutting down cpus with NMI [ 32.338894] Dumping ftrace buffer: [ 32.338897] (ftrace buffer empty) [ 32.338900] Kernel Offset: disabled [ 33.314986] Rebooting in 86400 seconds..