[ 9.584047] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.554651] random: sshd: uninitialized urandom read (32 bytes read) [ 21.766812] random: sshd: uninitialized urandom read (32 bytes read) [ 21.881949] random: crng init done Warning: Permanently added '10.128.0.179' (ECDSA) to the list of known hosts. 2019/09/03 07:49:44 parsed 1 programs 2019/09/03 07:49:45 executed programs: 0 [ 47.937162] audit: type=1400 audit(1567496986.338:5): 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 [ 48.303198] ------------[ cut here ]------------ [ 48.308006] kernel BUG at ./include/linux/skbuff.h:1294! [ 48.313453] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 48.318817] Modules linked in: [ 48.322131] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.190+ #2 [ 48.328353] task: 000000008239087c task.stack: 00000000b9d9b18d [ 48.334432] RIP: 0010:[] [<00000000ad7009d9>] tcp_fragment+0x1266/0x1390 [ 48.343388] RSP: 0018:ffff8801db707b90 EFLAGS: 00010206 [ 48.348816] RAX: ffff8801da6b2f80 RBX: ffff8801d0a48a80 RCX: 1ffff1003a1491cd [ 48.356076] RDX: 0000000000000100 RSI: ffffffff8252c406 RDI: ffff8801cbc10288 [ 48.363413] RBP: ffff8801db707be0 R08: 0000000002080020 R09: ffff8801cbc102a8 [ 48.370684] R10: ffff88021fffd050 R11: 0000000ba17ba565 R12: 0000000000000000 [ 48.377994] R13: ffff8801d0a48c70 R14: ffff8801cbc10280 R15: ffff8801d0a48cc4 [ 48.385523] FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 48.393735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.399981] CR2: 000000000075c000 CR3: 00000001cbcbf000 CR4: 00000000001606b0 [ 48.407373] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.414626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.421877] Stack: [ 48.424015] ffff8801cbc10280 ffff8801d0a48c70 ffff8801cbc102f8 ffff880102080020 [ 48.432335] 000068000000ffcb 0000000000006800 ffff8801d0a48a80 ffff8801cbc10280 [ 48.440681] 000000000000ffcb ffff8801cbc102b4 ffff8801db707c30 ffffffff8253fd65 [ 48.448777] Call Trace: [ 48.451339] [ 48.453400] [<000000005029487e>] tcp_write_wakeup+0x345/0x5b0 [ 48.459397] [<00000000786128c6>] tcp_send_probe0+0x4b/0x400 [ 48.465372] [<00000000e2f64aeb>] tcp_write_timer_handler+0x6a0/0x7a0 [ 48.471947] [<00000000cea2d03c>] tcp_write_timer+0xc5/0x190 [ 48.477727] [<00000000bd3112ef>] call_timer_fn+0x167/0x6d0 [ 48.483592] [<0000000026d6b595>] ? call_timer_fn+0xde/0x6d0 [ 48.489369] [<000000005b1a0767>] ? free_object+0x2b0/0x2b0 [ 48.495061] [<000000004202923b>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 48.501815] [<000000006dd65b7c>] ? process_timeout+0x20/0x20 [ 48.507765] [<000000002f69ca6b>] ? _raw_spin_unlock_irq+0x28/0x60 [ 48.514065] [<000000004202923b>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 48.521000] [<00000000f8389070>] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 48.527942] [<000000004202923b>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 48.534698] [<00000000c6b49c02>] expire_timers+0x25b/0x5c0 [ 48.540490] [<00000000f1add57c>] run_timer_softirq+0x1ff/0x620 [ 48.546561] [<000000001599bccc>] ? expire_timers+0x5c0/0x5c0 [ 48.552445] [<00000000db9ed6be>] ? check_preemption_disabled+0x3c/0x200 [ 48.559368] [<00000000db9ed6be>] ? check_preemption_disabled+0x3c/0x200 [ 48.566193] [<000000007fe3f41e>] __do_softirq+0x22d/0x964 [ 48.571809] [<00000000d75602c1>] ? hrtimer_interrupt+0x34b/0x450 [ 48.578030] [<00000000db9ed6be>] ? check_preemption_disabled+0x3c/0x200 [ 48.585147] [<000000000dfb3919>] irq_exit+0x119/0x160 [ 48.590417] [<00000000781cd91c>] smp_apic_timer_interrupt+0x7e/0xb0 [ 48.597151] [<000000001a597e75>] apic_timer_interrupt+0xa5/0xb0 [ 48.603548] [ 48.605768] [<00000000186439dc>] ? native_safe_halt+0x41/0x60 [ 48.611741] [<000000001011b274>] default_idle+0x56/0x370 [ 48.617282] [<000000005cc66a76>] arch_cpu_idle+0x10/0x20 [ 48.622803] [<00000000342338b6>] default_idle_call+0x36/0x60 [ 48.628679] [<000000009ecc9ac8>] cpu_startup_entry+0x283/0x3a0 [ 48.634837] [<00000000ce07f33a>] ? cpu_in_idle+0x20/0x20 [ 48.640390] [<000000008938aba1>] start_secondary+0x31c/0x410 [ 48.646288] [<00000000ce520db9>] ? set_cpu_sibling_map+0x1290/0x1290 [ 48.652847] 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 6a 5f df fe <0f> 0b e8 f3 20 fd fe e9 6e f0 ff ff e8 e9 20 fd fe e9 68 f3 ff [ 48.680508] RIP [<00000000ad7009d9>] tcp_fragment+0x1266/0x1390 [ 48.686786] RSP [ 48.690444] ---[ end trace 28a53f1e69d0eb8b ]--- [ 48.695207] Kernel panic - not syncing: Fatal exception in interrupt [ 48.702945] Kernel Offset: disabled [ 48.706835] Rebooting in 86400 seconds..