[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 10.605329] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 13.538050] random: sshd: uninitialized urandom read (32 bytes read) [ 13.670900] audit: type=1400 audit(1567498057.954:6): 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 [ 13.708104] random: sshd: uninitialized urandom read (32 bytes read) [ 14.206015] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.254' (ECDSA) to the list of known hosts. [ 19.873171] urandom_read: 1 callbacks suppressed [ 19.873176] random: sshd: uninitialized urandom read (32 bytes read) 2019/09/03 08:07:44 parsed 1 programs [ 19.971611] audit: type=1400 audit(1567498064.254:7): avc: denied { map } for pid=1771 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 [ 20.027957] audit: type=1400 audit(1567498064.304:8): avc: denied { map } for pid=1771 comm="syz-execprog" path="/sys/kernel/debug/kcov" dev="debugfs" ino=5044 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 [ 20.802672] random: cc1: uninitialized urandom read (8 bytes read) 2019/09/03 08:07:46 executed programs: 0 [ 21.786233] audit: type=1400 audit(1567498066.064:9): avc: denied { map } for pid=1771 comm="syz-execprog" path="/root/syzkaller-shm957544127" 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 [ 24.080136] ------------[ cut here ]------------ [ 24.084980] kernel BUG at ./include/linux/skbuff.h:1406! [ 24.090510] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 24.096388] Modules linked in: [ 24.099573] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.141+ #40 [ 24.105951] task: (ptrval) task.stack: (ptrval) [ 24.111989] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 24.116715] RSP: 0018:ffff8881db907bf8 EFLAGS: 00010206 [ 24.122052] RAX: ffff8881daa72f00 RBX: ffff8881d34b1500 RCX: 1ffff1103a6962e9 [ 24.129298] RDX: 0000000000000100 RSI: ffff8881cad4d400 RDI: ffff8881cad4d408 [ 24.136543] RBP: ffff8881cad4d400 R08: 0000000001080020 R09: ffff88821ffff048 [ 24.143788] R10: ffff88821ffff057 R11: ffff88821ffff050 R12: 0000000000000000 [ 24.151034] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881d34b1750 [ 24.158280] FS: 0000000000000000(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 [ 24.166484] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.172340] CR2: 000000000075c000 CR3: 00000001d0826003 CR4: 00000000001606a0 [ 24.179584] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.186827] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.194073] Call Trace: [ 24.196736] [ 24.198872] tcp_write_wakeup+0x32b/0x570 [ 24.202995] ? tcp_write_timer_handler+0x780/0x780 [ 24.207898] ? tcp_write_timer_handler+0x780/0x780 [ 24.212801] tcp_send_probe0+0x46/0x3cc [ 24.216753] ? tcp_write_timer_handler+0x780/0x780 [ 24.221657] tcp_write_timer_handler+0x687/0x780 [ 24.226391] tcp_write_timer+0xc9/0x170 [ 24.230343] call_timer_fn+0x15b/0x6a0 [ 24.234218] ? collect_expired_timers+0x280/0x280 [ 24.239035] ? check_preemption_disabled+0x35/0x1f0 [ 24.244031] ? _raw_spin_unlock_irq+0x24/0x50 [ 24.248500] ? tcp_write_timer_handler+0x780/0x780 [ 24.253425] expire_timers+0x227/0x4c0 [ 24.257724] run_timer_softirq+0x1eb/0x5d0 [ 24.261939] ? expire_timers+0x4c0/0x4c0 [ 24.265980] ? check_preemption_disabled+0x35/0x1f0 [ 24.270970] ? check_preemption_disabled+0x35/0x1f0 [ 24.275974] __do_softirq+0x234/0x9ec [ 24.279762] ? check_preemption_disabled+0x35/0x1f0 [ 24.284766] irq_exit+0x114/0x150 [ 24.288217] smp_apic_timer_interrupt+0x1a7/0x650 [ 24.293046] apic_timer_interrupt+0x8c/0xa0 [ 24.297358] [ 24.299585] RIP: 0010:native_safe_halt+0x13/0x20 [ 24.304323] RSP: 0018:ffff8881daa8fd60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 24.312013] RAX: 0000000000000000 RBX: ffffffffb162eba8 RCX: 0000000000000000 [ 24.319268] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881daa7372c [ 24.326615] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 [ 24.333862] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.341110] R13: 0000000000000000 R14: ffff8881daa72f00 R15: dffffc0000000000 [ 24.348371] default_idle+0x61/0x3b0 [ 24.352070] do_idle+0x2e6/0x390 [ 24.355498] ? arch_cpu_idle_exit+0x40/0x40 [ 24.359865] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 24.364960] ? trace_hardirqs_on_caller+0x37b/0x540 [ 24.369975] cpu_startup_entry+0xc6/0xd0 [ 24.374022] ? cpu_in_idle+0x20/0x20 [ 24.377717] ? trace_hardirqs_on_caller+0x37b/0x540 [ 24.382737] start_secondary+0x3a8/0x4b0 [ 24.386782] ? set_cpu_sibling_map+0x1110/0x1110 [ 24.391619] secondary_startup_64+0xa5/0xb0 [ 24.395918] 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 4a d0 da fe <0f> 0b e8 c3 98 fd fe e9 4d ef ff ff e8 b9 98 fd fe e9 2d f2 ff [ 24.414986] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881db907bf8 [ 24.421227] ---[ end trace 3884a2eb18d775f5 ]--- [ 24.425968] Kernel panic - not syncing: Fatal exception in interrupt [ 24.433157] Kernel Offset: 0x2de00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 24.444056] Rebooting in 86400 seconds..