[ 8.691289] 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: [ 13.844811] random: sshd: uninitialized urandom read (32 bytes read) [ 14.047601] random: sshd: uninitialized urandom read (32 bytes read) [ 14.591996] random: sshd: uninitialized urandom read (32 bytes read) [ 14.704430] random: crng init done Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. 2019/08/18 08:05:54 parsed 1 programs 2019/08/18 08:05:55 executed programs: 0 [ 42.977145] audit: type=1400 audit(1566115555.697:5): avc: denied { associate } for pid=2070 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 [ 43.335110] ------------[ cut here ]------------ [ 43.339864] kernel BUG at ./include/linux/skbuff.h:1294! [ 43.345283] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 43.350618] Modules linked in: [ 43.354017] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.189+ #2 [ 43.360230] task: 00000000df9f1073 task.stack: 000000009bb4f61f [ 43.366269] RIP: 0010:[] [<00000000f28f9683>] tcp_fragment+0x1266/0x1390 [ 43.374861] RSP: 0018:ffff8801db707b90 EFLAGS: 00010206 [ 43.380288] RAX: ffff8801da6b2f80 RBX: ffff8801d25c1f80 RCX: 1ffff1003a4b846d [ 43.387534] RDX: 0000000000000100 RSI: ffffffff8252ae16 RDI: ffff8801c4cb1188 [ 43.394817] RBP: ffff8801db707be0 R08: 0000000002080020 R09: ffff8801c4cb11a8 [ 43.402065] R10: ffff88021fffd050 R11: 0000000a7363cc76 R12: 0000000000000000 [ 43.409308] R13: ffff8801d25c2170 R14: ffff8801c4cb1180 R15: ffff8801d25c21c4 [ 43.416552] FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 43.424943] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.430802] CR2: 000000000075c000 CR3: 00000001caca7000 CR4: 00000000001606b0 [ 43.438053] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.445297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.452537] Stack: [ 43.454660] ffff8801c4cb1180 ffff8801d25c2170 ffff8801c4cb11f8 ffff880102080020 [ 43.462645] 000068000000ffcb 0000000000006800 ffff8801d25c1f80 ffff8801c4cb1180 [ 43.470628] 000000000000ffcb ffff8801c4cb11b4 ffff8801db707c30 ffffffff8253e775 [ 43.478626] Call Trace: [ 43.481180] [ 43.483220] [<0000000060a5336c>] tcp_write_wakeup+0x345/0x5b0 [ 43.489184] [<0000000065910b03>] tcp_send_probe0+0x4b/0x400 [ 43.494953] [<00000000e304714e>] tcp_write_timer_handler+0x6a0/0x7a0 [ 43.501509] [<00000000ce9905b7>] tcp_write_timer+0xc5/0x190 [ 43.507279] [<00000000db84dab9>] call_timer_fn+0x167/0x6d0 [ 43.512963] [<0000000060a2e88b>] ? call_timer_fn+0xde/0x6d0 [ 43.518738] [<0000000056661ae4>] ? free_object+0x2b0/0x2b0 [ 43.524511] [<00000000393031b9>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 43.531246] [<00000000747f73d6>] ? process_timeout+0x20/0x20 [ 43.537105] [<000000007a57c151>] ? _raw_spin_unlock_irq+0x28/0x60 [ 43.543479] [<00000000393031b9>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 43.550219] [<00000000bb675b21>] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 43.557152] [<00000000393031b9>] ? tcp_write_timer_handler+0x7a0/0x7a0 [ 43.563905] [<00000000e00ebbc1>] expire_timers+0x25b/0x5c0 [ 43.569591] [<000000008bf8230c>] run_timer_softirq+0x1ff/0x620 [ 43.575633] [<00000000a7cec165>] ? expire_timers+0x5c0/0x5c0 [ 43.581541] [<00000000eeb2bd55>] ? check_preemption_disabled+0x3c/0x200 [ 43.588513] [<00000000eeb2bd55>] ? check_preemption_disabled+0x3c/0x200 [ 43.595530] [<000000003bd01834>] __do_softirq+0x22d/0x964 [ 43.601131] [<00000000bff252ac>] ? hrtimer_interrupt+0x34b/0x450 [ 43.607500] [<00000000eeb2bd55>] ? check_preemption_disabled+0x3c/0x200 [ 43.614325] [<000000009248ad37>] irq_exit+0x119/0x160 [ 43.619586] [<00000000c3a120a9>] smp_apic_timer_interrupt+0x7e/0xb0 [ 43.626052] [<000000003a5f7321>] apic_timer_interrupt+0xa5/0xb0 [ 43.632175] [ 43.634225] [<00000000c0a1d306>] ? native_safe_halt+0x41/0x60 [ 43.640200] [<000000009afe796e>] default_idle+0x56/0x370 [ 43.645718] [<00000000d8500de9>] arch_cpu_idle+0x10/0x20 [ 43.651226] [<00000000c0015770>] default_idle_call+0x36/0x60 [ 43.657083] [<000000001859e952>] cpu_startup_entry+0x283/0x3a0 [ 43.663111] [<000000003eb93441>] ? cpu_in_idle+0x20/0x20 [ 43.668621] [<00000000c64f0105>] start_secondary+0x31c/0x410 [ 43.674481] [<0000000019475546>] ? set_cpu_sibling_map+0x1290/0x1290 [ 43.681031] 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 [ 43.707977] RIP [<00000000f28f9683>] tcp_fragment+0x1266/0x1390 [ 43.714229] RSP [ 43.717914] ---[ end trace 6f27c490bdd65027 ]--- [ 43.722642] Kernel panic - not syncing: Fatal exception in interrupt [ 43.729544] Kernel Offset: disabled [ 43.733168] Rebooting in 86400 seconds..