[....] 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: [ 11.733768] random: sshd: uninitialized urandom read (32 bytes read) [ 11.875915] audit: type=1400 audit(1566143869.430:6): avc: denied { map } for pid=1758 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 [ 11.904788] random: sshd: uninitialized urandom read (32 bytes read) [ 12.399189] random: sshd: uninitialized urandom read (32 bytes read) [ 27.330895] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.80' (ECDSA) to the list of known hosts. [ 32.708361] random: sshd: uninitialized urandom read (32 bytes read) [ 32.800499] audit: type=1400 audit(1566143890.360:7): avc: denied { map } for pid=1782 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 2019/08/18 15:58:11 parsed 1 programs [ 33.761994] audit: type=1400 audit(1566143891.320:8): avc: denied { map } for pid=1782 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 [ 34.214741] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/18 15:58:12 executed programs: 0 [ 35.110201] audit: type=1400 audit(1566143892.660:9): avc: denied { map } for pid=1782 comm="syz-execprog" path="/root/syzkaller-shm268486917" 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 [ 37.450121] ------------[ cut here ]------------ [ 37.455047] kernel BUG at ./include/linux/skbuff.h:1406! [ 37.460543] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 37.466403] Modules linked in: [ 37.469577] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.139+ #34 [ 37.475950] task: (ptrval) task.stack: (ptrval) [ 37.481984] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 37.486708] RSP: 0018:ffff8881dbb07bf8 EFLAGS: 00010206 [ 37.492041] RAX: ffff8881daa72f00 RBX: ffff8881c9f30a80 RCX: 1ffff110393e6199 [ 37.499284] RDX: 0000000000000100 RSI: ffff8881cd8bb400 RDI: ffff8881cd8bb408 [ 37.506550] RBP: ffff8881cd8bb400 R08: 0000000001080020 R09: ffff88821fffd048 [ 37.513802] R10: ffff88821fffd057 R11: ffff88821fffd050 R12: 0000000000000000 [ 37.521141] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881c9f30cd0 [ 37.528387] FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 [ 37.536677] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.542650] CR2: 000000000075c000 CR3: 000000005f026005 CR4: 00000000001606a0 [ 37.549902] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.557148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.564392] Call Trace: [ 37.566949] [ 37.569082] tcp_write_wakeup+0x32b/0x570 [ 37.573205] ? tcp_write_timer_handler+0x780/0x780 [ 37.578109] ? tcp_write_timer_handler+0x780/0x780 [ 37.583011] tcp_send_probe0+0x46/0x3cc [ 37.587039] ? tcp_write_timer_handler+0x780/0x780 [ 37.591958] tcp_write_timer_handler+0x687/0x780 [ 37.596691] tcp_write_timer+0xc9/0x170 [ 37.600651] call_timer_fn+0x15b/0x6a0 [ 37.604514] ? collect_expired_timers+0x280/0x280 [ 37.609418] ? check_preemption_disabled+0x35/0x1f0 [ 37.614412] ? _raw_spin_unlock_irq+0x24/0x50 [ 37.618935] ? tcp_write_timer_handler+0x780/0x780 [ 37.623842] expire_timers+0x227/0x4c0 [ 37.627804] run_timer_softirq+0x1eb/0x5d0 [ 37.632014] ? expire_timers+0x4c0/0x4c0 [ 37.636055] ? check_preemption_disabled+0x35/0x1f0 [ 37.641150] ? check_preemption_disabled+0x35/0x1f0 [ 37.646165] __do_softirq+0x234/0x9ec [ 37.649939] ? check_preemption_disabled+0x35/0x1f0 [ 37.655088] irq_exit+0x114/0x150 [ 37.658520] smp_apic_timer_interrupt+0x1a7/0x650 [ 37.663347] apic_timer_interrupt+0x8c/0xa0 [ 37.667637] [ 37.669847] RIP: 0010:native_safe_halt+0x13/0x20 [ 37.674575] RSP: 0018:ffff8881daa8fd60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 37.682263] RAX: 0000000000000000 RBX: ffffffffb222dcc8 RCX: 0000000000000000 [ 37.689530] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881daa7372c [ 37.696781] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 [ 37.704156] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 37.711416] R13: 0000000000000000 R14: ffff8881daa72f00 R15: dffffc0000000000 [ 37.718673] default_idle+0x61/0x3b0 [ 37.722392] do_idle+0x2e6/0x390 [ 37.725741] ? arch_cpu_idle_exit+0x40/0x40 [ 37.730035] cpu_startup_entry+0xc6/0xd0 [ 37.734069] ? cpu_in_idle+0x20/0x20 [ 37.737765] ? trace_hardirqs_on_caller+0x37b/0x540 [ 37.742811] start_secondary+0x3a8/0x4b0 [ 37.746860] ? set_cpu_sibling_map+0x1110/0x1110 [ 37.751600] secondary_startup_64+0xa5/0xb0 [ 37.755901] 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 7a f7 da fe <0f> 0b e8 93 ba fd fe e9 4d ef ff ff e8 89 ba fd fe e9 2d f2 ff [ 37.774967] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881dbb07bf8 [ 37.781222] ---[ end trace 536504f5a7796fcf ]--- [ 37.785950] Kernel panic - not syncing: Fatal exception in interrupt [ 37.792716] Kernel Offset: 0x2ea00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 37.803981] Rebooting in 86400 seconds..