[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 12.261246] random: sshd: uninitialized urandom read (32 bytes read) [ 12.492732] audit: type=1400 audit(1566587128.406:6): avc: denied { map } for pid=1759 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Debian GNU/Linux 7 syzkaller ttyS0 [ 12.543381] random: sshd: uninitialized urandom read (32 bytes read) syzkaller login: [ 13.054223] random: sshd: uninitialized urandom read (32 bytes read) [ 16.229594] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.171' (ECDSA) to the list of known hosts. [ 21.684584] random: sshd: uninitialized urandom read (32 bytes read) [ 21.783923] audit: type=1400 audit(1566587137.696:7): avc: denied { map } for pid=1777 comm="syz-execprog" path="/root/syz-execprog" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 2019/08/23 19:05:38 parsed 1 programs [ 22.871128] audit: type=1400 audit(1566587138.786:8): avc: denied { map } for pid=1777 comm="syz-execprog" path="/sys/kernel/debug/kcov" dev="debugfs" ino=5035 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 [ 23.441024] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/23 19:05:40 executed programs: 0 [ 24.784733] audit: type=1400 audit(1566587140.696:9): avc: denied { map } for pid=1777 comm="syz-execprog" path="/root/syzkaller-shm411764963" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 [ 27.140215] ------------[ cut here ]------------ [ 27.145396] kernel BUG at ./include/linux/skbuff.h:1406! [ 27.151171] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 27.157165] Modules linked in: [ 27.160441] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.139+ #37 [ 27.167524] task: (ptrval) task.stack: (ptrval) [ 27.174048] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 27.179297] RSP: 0018:ffff8881dbb07bf8 EFLAGS: 00010206 [ 27.185175] RAX: ffff8881daa72f00 RBX: ffff8881d2570a80 RCX: 1ffff1103a4ae199 [ 27.193511] RDX: 0000000000000100 RSI: ffff8881cf0c2280 RDI: ffff8881cf0c2288 [ 27.201271] RBP: ffff8881cf0c2280 R08: 0000000001080020 R09: ffff88821fffd048 [ 27.209370] R10: ffff88821fffd057 R11: ffff88821fffd050 R12: 0000000000000000 [ 27.217549] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881d2570cd0 [ 27.226059] FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 [ 27.235003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.240977] CR2: 000000000075c000 CR3: 00000000bc226003 CR4: 00000000001606a0 [ 27.248240] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.255818] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.263232] Call Trace: [ 27.265811] [ 27.268109] tcp_write_wakeup+0x32b/0x570 [ 27.272503] ? tcp_write_timer_handler+0x780/0x780 [ 27.278076] ? tcp_write_timer_handler+0x780/0x780 [ 27.283005] tcp_send_probe0+0x46/0x3cc [ 27.287197] ? tcp_write_timer_handler+0x780/0x780 [ 27.292751] tcp_write_timer_handler+0x687/0x780 [ 27.297952] tcp_write_timer+0xc9/0x170 [ 27.301926] call_timer_fn+0x15b/0x6a0 [ 27.306021] ? collect_expired_timers+0x280/0x280 [ 27.310849] ? check_preemption_disabled+0x35/0x1f0 [ 27.316051] ? _raw_spin_unlock_irq+0x24/0x50 [ 27.320538] ? tcp_write_timer_handler+0x780/0x780 [ 27.325462] expire_timers+0x227/0x4c0 [ 27.329341] run_timer_softirq+0x1eb/0x5d0 [ 27.333837] ? expire_timers+0x4c0/0x4c0 [ 27.338065] ? check_preemption_disabled+0x35/0x1f0 [ 27.343077] ? check_preemption_disabled+0x35/0x1f0 [ 27.348143] __do_softirq+0x234/0x9ec [ 27.351940] ? check_preemption_disabled+0x35/0x1f0 [ 27.356953] irq_exit+0x114/0x150 [ 27.360410] smp_apic_timer_interrupt+0x1a7/0x650 [ 27.365255] apic_timer_interrupt+0x8c/0xa0 [ 27.369572] [ 27.371825] RIP: 0010:native_safe_halt+0x13/0x20 [ 27.376569] RSP: 0018:ffff8881daa8fd60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 27.384410] RAX: 0000000000000000 RBX: ffffffffae42e088 RCX: 0000000000000000 [ 27.391806] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881daa7372c [ 27.399298] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 [ 27.407521] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 27.414778] R13: 0000000000000000 R14: ffff8881daa72f00 R15: dffffc0000000000 [ 27.422057] default_idle+0x61/0x3b0 [ 27.425886] do_idle+0x2e6/0x390 [ 27.429508] ? arch_cpu_idle_exit+0x40/0x40 [ 27.433949] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 27.439174] ? trace_hardirqs_on_caller+0x37b/0x540 [ 27.444427] cpu_startup_entry+0xc6/0xd0 [ 27.448476] ? cpu_in_idle+0x20/0x20 [ 27.452180] ? trace_hardirqs_on_caller+0x37b/0x540 [ 27.457185] start_secondary+0x3a8/0x4b0 [ 27.461327] ? set_cpu_sibling_map+0x1110/0x1110 [ 27.466327] secondary_startup_64+0xa5/0xb0 [ 27.470811] Code: ea 03 80 3c 02 00 0f 85 2c 01 00 00 4c 8b bb 58 02 00 00 ba 00 00 00 00 4c 3b 7c 24 18 4c 0f 44 fa e9 bd fc ff ff e8 fa ee da fe <0f> 0b e8 13 b2 fd fe e9 4d ef ff ff e8 09 b2 fd fe e9 2d f2 ff [ 27.490702] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881dbb07bf8 [ 27.497459] ---[ end trace b0d4d6aadf841faf ]--- [ 27.502505] Kernel panic - not syncing: Fatal exception in interrupt [ 27.510374] Kernel Offset: 0x2ac00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 27.521900] Rebooting in 86400 seconds..