[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 8.851649] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.318440] random: sshd: uninitialized urandom read (32 bytes read) [ 15.398902] random: crng init done Warning: Permanently added '10.128.1.34' (ECDSA) to the list of known hosts. 2019/08/23 12:52:26 parsed 1 programs 2019/08/23 12:52:27 executed programs: 0 [ 24.349560] audit: type=1400 audit(1566564748.189:5): avc: denied { associate } for pid=2057 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 [ 24.710179] ------------[ cut here ]------------ [ 24.714941] kernel BUG at ./include/linux/skbuff.h:1294! [ 24.720359] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 24.725841] Modules linked in: [ 24.729119] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.189+ #3 [ 24.735441] task: 00000000baedce43 task.stack: 0000000065981f14 [ 24.741467] RIP: 0010:[] [<000000002b3f1cf0>] tcp_fragment+0x1266/0x1390 [ 24.750536] RSP: 0018:ffff8801db707b90 EFLAGS: 00010206 [ 24.756083] RAX: ffff8801da6b2f80 RBX: ffff8801d0c50a80 RCX: 1ffff1003a18a1cd [ 24.763656] RDX: 0000000000000100 RSI: ffffffff8252ae16 RDI: ffff8801cc5c2a08 [ 24.770894] RBP: ffff8801db707be0 R08: 0000000002080020 R09: ffff8801cc5c2a28 [ 24.778130] R10: ffff88021fffd050 R11: 0000000620dc5bb8 R12: 0000000000000000 [ 24.785376] R13: ffff8801d0c50c70 R14: ffff8801cc5c2a00 R15: ffff8801d0c50cc4 [ 24.792626] FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 24.800820] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.806670] CR2: 000000000075c000 CR3: 00000001ce923000 CR4: 00000000001606b0 [ 24.813909] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.821263] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.828499] Stack: [ 24.830619] ffff8801cc5c2a00 ffff8801d0c50c70 ffff8801cc5c2a78 ffff880102080020 [ 24.838701] 000068000000ffcb 0000000000006800 ffff8801d0c50a80 ffff8801cc5c2a00 [ 24.846808] 000000000000ffcb ffff8801cc5c2a34 ffff8801db707c30 ffffffff8253e775 [ 24.854779] Call Trace: [ 24.857333] [ 24.859369] [<00000000f7cb0f97>] tcp_write_wakeup+0x345/0x5b0 [ 24.865445] [<00000000b569a837>] tcp_send_probe0+0x4b/0x400 [ 24.871211] [<0000000002510916>] tcp_write_timer_handler+0x6a0/0x7a0 [ 24.877754] [<0000000093600ef3>] tcp_write_timer+0xc5/0x190 [ 24.883650] [<0000000037dfc2f0>] call_timer_fn+0x167/0x6d0 [ 24.889551] [<00000000ab97d20f>] ? call_timer_fn+0xde/0x6d0 [ 24.895324] [<00000000ac5a33a3>] ? free_object+0x2b0/0x2b0 [ 24.901003] [<00000000c7df0a65>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 24.907917] [<000000007f03fdfe>] ? process_timeout+0x20/0x20 [ 24.913778] [<00000000fbf49a0e>] ? _raw_spin_unlock_irq+0x28/0x60 [ 24.920203] [<00000000c7df0a65>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 24.926934] [<00000000a126fe98>] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 24.933872] [<00000000c7df0a65>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 24.940868] [<0000000033226f6f>] expire_timers+0x25b/0x5c0 [ 24.946556] [<000000001a01afe1>] run_timer_softirq+0x1ff/0x620 [ 24.952593] [<00000000de949c04>] ? expire_timers+0x5c0/0x5c0 [ 24.958448] [<00000000b20bd2e3>] ? check_preemption_disabled+0x3c/0x200 [ 24.965295] [<00000000b20bd2e3>] ? check_preemption_disabled+0x3c/0x200 [ 24.972115] [<00000000cf43f1c9>] __do_softirq+0x22d/0x964 [ 24.977722] [<000000002854fbc6>] ? hrtimer_interrupt+0x34b/0x450 [ 24.983929] [<00000000b20bd2e3>] ? check_preemption_disabled+0x3c/0x200 [ 24.990784] [<000000003b06628c>] irq_exit+0x119/0x160 [ 24.996043] [<0000000040152d73>] smp_apic_timer_interrupt+0x7e/0xb0 [ 25.002506] [<000000006c75ab19>] apic_timer_interrupt+0xa5/0xb0 [ 25.008616] [ 25.010655] [<00000000ca686bf3>] ? native_safe_halt+0x41/0x60 [ 25.016622] [<00000000782eeaa4>] default_idle+0x56/0x370 [ 25.022136] [<00000000a8a19819>] arch_cpu_idle+0x10/0x20 [ 25.027687] [<00000000074ec79f>] default_idle_call+0x36/0x60 [ 25.033554] [<000000005aa6b44b>] cpu_startup_entry+0x283/0x3a0 [ 25.039580] [<00000000a6873f8d>] ? cpu_in_idle+0x20/0x20 [ 25.045091] [<00000000b1fcdb09>] start_secondary+0x31c/0x410 [ 25.050945] [<0000000091461f73>] ? set_cpu_sibling_map+0x1290/0x1290 [ 25.057490] 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 [ 25.084385] RIP [<000000002b3f1cf0>] tcp_fragment+0x1266/0x1390 [ 25.090634] RSP [ 25.094271] ---[ end trace ec5794efee9e45e7 ]--- [ 25.099012] Kernel panic - not syncing: Fatal exception in interrupt [ 25.105941] Kernel Offset: disabled [ 25.109546] Rebooting in 86400 seconds..