[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.469761] random: sshd: uninitialized urandom read (32 bytes read) [ 19.833370] audit: type=1400 audit(1566678552.501:6): avc: denied { map } for pid=1751 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 [ 19.895024] random: sshd: uninitialized urandom read (32 bytes read) [ 20.400871] random: sshd: uninitialized urandom read (32 bytes read) [ 37.820577] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 43.269121] random: sshd: uninitialized urandom read (32 bytes read) [ 43.360155] audit: type=1400 audit(1566678576.021:7): avc: denied { map } for pid=1775 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 2019/08/24 20:29:36 parsed 1 programs [ 44.214813] audit: type=1400 audit(1566678576.881:8): avc: denied { map } for pid=1775 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 [ 44.951933] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/24 20:29:38 executed programs: 0 [ 45.963971] audit: type=1400 audit(1566678578.631:9): avc: denied { map } for pid=1775 comm="syz-execprog" path="/root/syzkaller-shm013358641" dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 [ 48.140135] ------------[ cut here ]------------ [ 48.144990] kernel BUG at ./include/linux/skbuff.h:1406! [ 48.150462] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 48.156310] Modules linked in: [ 48.159469] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.139+ #37 [ 48.165837] task: (ptrval) task.stack: (ptrval) [ 48.171872] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 48.176593] RSP: 0018:ffff8881dba07bf8 EFLAGS: 00010206 [ 48.181926] RAX: ffffffff83a30c40 RBX: ffff8881d2088000 RCX: 1ffff1103a411049 [ 48.189161] RDX: 0000000000000100 RSI: ffff8881d6e8e000 RDI: ffff8881d6e8e008 [ 48.196413] RBP: ffff8881d6e8e000 R08: 0000000001080020 R09: ffff88821ffff008 [ 48.203655] R10: ffff88821ffff017 R11: ffff88821ffff010 R12: 0000000000000000 [ 48.210901] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881d2088250 [ 48.218139] FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 [ 48.226330] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.232176] CR2: 000000000075c000 CR3: 00000001adc26001 CR4: 00000000001606b0 [ 48.239413] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.246654] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.253891] Call Trace: [ 48.256472] [ 48.258593] tcp_write_wakeup+0x32b/0x570 [ 48.262715] ? tcp_write_timer_handler+0x780/0x780 [ 48.267616] ? tcp_write_timer_handler+0x780/0x780 [ 48.272511] tcp_send_probe0+0x46/0x3cc [ 48.276455] ? tcp_write_timer_handler+0x780/0x780 [ 48.281355] tcp_write_timer_handler+0x687/0x780 [ 48.286079] tcp_write_timer+0xc9/0x170 [ 48.290110] call_timer_fn+0x15b/0x6a0 [ 48.293964] ? collect_expired_timers+0x280/0x280 [ 48.298778] ? check_preemption_disabled+0x35/0x1f0 [ 48.303763] ? _raw_spin_unlock_irq+0x24/0x50 [ 48.308233] ? tcp_write_timer_handler+0x780/0x780 [ 48.313132] expire_timers+0x227/0x4c0 [ 48.316990] run_timer_softirq+0x1eb/0x5d0 [ 48.321193] ? expire_timers+0x4c0/0x4c0 [ 48.325221] ? check_preemption_disabled+0x35/0x1f0 [ 48.330205] ? check_preemption_disabled+0x35/0x1f0 [ 48.335194] __do_softirq+0x234/0x9ec [ 48.338968] ? check_preemption_disabled+0x35/0x1f0 [ 48.343957] irq_exit+0x114/0x150 [ 48.347378] smp_apic_timer_interrupt+0x1a7/0x650 [ 48.352185] apic_timer_interrupt+0x8c/0xa0 [ 48.356477] [ 48.358683] RIP: 0010:native_safe_halt+0x13/0x20 [ 48.363403] RSP: 0018:ffffffff83a07d48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 48.371087] RAX: 0000000000000000 RBX: ffffffff83e2e088 RCX: 0000000000000000 [ 48.379791] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff83a3146c [ 48.387034] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 48.394270] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 48.401557] R13: 0000000000000000 R14: ffffffff83a30c40 R15: dffffc0000000000 [ 48.408908] default_idle+0x61/0x3b0 [ 48.412723] do_idle+0x2e6/0x390 [ 48.416061] ? arch_cpu_idle_exit+0x40/0x40 [ 48.420353] cpu_startup_entry+0xc6/0xd0 [ 48.424383] ? cpu_in_idle+0x20/0x20 [ 48.428122] ? preempt_count_add+0xb8/0x180 [ 48.432420] ? trace_event_define_fields_x86_irq_vector+0x28/0x28 [ 48.438622] start_kernel+0x712/0x74a [ 48.442404] ? mem_encrypt_init+0x5/0x5 [ 48.446367] ? memcpy_orig+0x54/0x110 [ 48.450155] secondary_startup_64+0xa5/0xb0 [ 48.454447] 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 [ 48.473568] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881dba07bf8 [ 48.479945] ---[ end trace c0df0128b7186c9e ]--- [ 48.484678] Kernel panic - not syncing: Fatal exception in interrupt [ 48.491554] Kernel Offset: 0x600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 48.502272] Rebooting in 86400 seconds..