Starting mcstransd: [ 9.623120] random: sshd: uninitialized urandom read (32 bytes read) [....] 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: [ 11.932932] random: sshd: uninitialized urandom read (32 bytes read) [ 12.099440] random: sshd: uninitialized urandom read (32 bytes read) [ 12.219506] random: crng init done Warning: Permanently added '10.128.0.147' (ECDSA) to the list of known hosts. 2019/08/18 16:14:00 parsed 1 programs 2019/08/18 16:14:02 executed programs: 0 [ 45.849922] audit: type=1400 audit(1566144842.468:5): avc: denied { associate } for pid=2074 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 [ 46.206428] ------------[ cut here ]------------ [ 46.211365] kernel BUG at ./include/linux/skbuff.h:1294! [ 46.216910] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 46.222544] Modules linked in: [ 46.226416] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.189+ #2 [ 46.232752] task: 000000005f4da544 task.stack: 0000000066524ec6 [ 46.239190] RIP: 0010:[] [<00000000ea0a3b27>] tcp_fragment+0x1266/0x1390 [ 46.247970] RSP: 0018:ffff8801db607b90 EFLAGS: 00010206 [ 46.253446] RAX: ffffffff83031180 RBX: ffff8801d2b68a80 RCX: 1ffff1003a56d1cd [ 46.260707] RDX: 0000000000000100 RSI: ffffffff8252ae16 RDI: ffff8801cab27b88 [ 46.268171] RBP: ffff8801db607be0 R08: 0000000002080020 R09: ffff8801cab27ba8 [ 46.275513] R10: ffff88021fffd010 R11: 0000000b16bcbd24 R12: 0000000000000000 [ 46.282768] R13: ffff8801d2b68c70 R14: ffff8801cab27b80 R15: ffff8801d2b68cc4 [ 46.290018] FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 46.298665] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.304527] CR2: 000000000075c000 CR3: 00000001ce493000 CR4: 00000000001606b0 [ 46.312048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.319390] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.326871] Stack: [ 46.329115] ffff8801cab27b80 ffff8801d2b68c70 ffff8801cab27bf8 ffff880102080020 [ 46.337428] 000068000000ffcb 0000000000006800 ffff8801d2b68a80 ffff8801cab27b80 [ 46.345881] 000000000000ffcb ffff8801cab27bb4 ffff8801db607c30 ffffffff8253e775 [ 46.354492] Call Trace: [ 46.357248] [ 46.359380] [<00000000a7201b2f>] tcp_write_wakeup+0x345/0x5b0 [ 46.365700] [<000000005ecb644a>] tcp_send_probe0+0x4b/0x400 [ 46.371567] [<000000009d3007d3>] tcp_write_timer_handler+0x6a0/0x7a0 [ 46.378134] [<0000000081979ffb>] tcp_write_timer+0xc5/0x190 [ 46.384431] [<00000000af85f356>] call_timer_fn+0x167/0x6d0 [ 46.390226] [<0000000078625664>] ? call_timer_fn+0xde/0x6d0 [ 46.396196] [<00000000e631684d>] ? free_object+0x2b0/0x2b0 [ 46.402015] [<000000008fe92da6>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 46.409100] [<000000005fea68a7>] ? process_timeout+0x20/0x20 [ 46.414971] [<00000000003cb67b>] ? _raw_spin_unlock_irq+0x28/0x60 [ 46.421713] [<000000008fe92da6>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 46.428906] [<00000000bb2ed688>] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 46.436082] [<000000008fe92da6>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 46.443129] [<00000000f3c085ce>] expire_timers+0x25b/0x5c0 [ 46.449349] [<000000003bf7fea5>] run_timer_softirq+0x1ff/0x620 [ 46.455783] [<000000002e0dd821>] ? expire_timers+0x5c0/0x5c0 [ 46.462129] [<000000003b8e8d78>] ? check_preemption_disabled+0x3c/0x200 [ 46.469225] [<000000003b8e8d78>] ? check_preemption_disabled+0x3c/0x200 [ 46.476403] [<000000006939ddc6>] __do_softirq+0x22d/0x964 [ 46.482265] [<000000001050e2b0>] ? hrtimer_interrupt+0x34b/0x450 [ 46.488495] [<000000003b8e8d78>] ? check_preemption_disabled+0x3c/0x200 [ 46.495726] [<0000000000084f71>] irq_exit+0x119/0x160 [ 46.501491] [<00000000bfc857c7>] smp_apic_timer_interrupt+0x7e/0xb0 [ 46.507972] [<000000003840c320>] apic_timer_interrupt+0xa5/0xb0 [ 46.514334] [ 46.516383] [<0000000036e2bbb5>] ? native_safe_halt+0x41/0x60 [ 46.522362] [<00000000e7f09cbe>] ? trace_hardirqs_on+0xd/0x10 [ 46.528397] [<00000000d1e4e7f2>] default_idle+0x56/0x370 [ 46.534253] [<00000000cb1a9378>] arch_cpu_idle+0x10/0x20 [ 46.539825] [<00000000d86b6505>] default_idle_call+0x36/0x60 [ 46.545833] [<00000000437920f6>] cpu_startup_entry+0x283/0x3a0 [ 46.551976] [<00000000c6329e31>] ? cpu_in_idle+0x20/0x20 [ 46.557499] [<000000000e91c1f2>] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 46.564325] [<000000000980046c>] rest_init+0x18b/0x194 [ 46.569674] [<0000000062ddf87f>] ? trace_event_define_fields_x86_irq_vector+0x2c/0x2c [ 46.577820] [<0000000092e785b8>] start_kernel+0x61e/0x652 [ 46.583866] [<000000006b40eec2>] ? thread_stack_cache_init+0xb/0xb [ 46.590339] [<0000000001b2b046>] ? early_idt_handler_array+0x120/0x120 [ 46.597435] [<00000000954d7a37>] x86_64_start_reservations+0x29/0x2b [ 46.604291] [<000000000870e232>] x86_64_start_kernel+0x137/0x15a [ 46.610619] Code: c1 ea 03 80 3c 02 00 0f 85 3a 01 00 00 4c 8b ab f8 01 00 00 ba 00 00 00 00 4c 3b 6d b8 4c 0f 44 ea e9 f9 fc ff ff e8 5a 75 df fe <0f> 0b e8 93 36 fd fe e9 6e f0 ff ff e8 89 36 fd fe e9 68 f3 ff [ 46.638940] RIP [<00000000ea0a3b27>] tcp_fragment+0x1266/0x1390 [ 46.645529] RSP [ 46.649272] ---[ end trace f48a6901aa9493af ]--- [ 46.654057] Kernel panic - not syncing: Fatal exception in interrupt [ 46.661841] Kernel Offset: disabled [ 46.665466] Rebooting in 86400 seconds..