[....] Starting OpenBSD Secure Shell server: sshd[ 10.329745] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.440964] random: sshd: uninitialized urandom read (32 bytes read) [ 14.563544] audit: type=1400 audit(1566114476.120:6): avc: denied { map } for pid=1762 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 [ 14.595465] random: sshd: uninitialized urandom read (32 bytes read) [ 15.104815] random: sshd: uninitialized urandom read (32 bytes read) [ 26.884187] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 32.418608] random: sshd: uninitialized urandom read (32 bytes read) [ 32.510927] audit: type=1400 audit(1566114494.070:7): avc: denied { map } for pid=1786 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 07:48:15 parsed 1 programs [ 33.467881] audit: type=1400 audit(1566114495.020:8): avc: denied { map } for pid=1786 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 [ 33.847248] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/18 07:48:16 executed programs: 0 [ 34.834087] audit: type=1400 audit(1566114496.390:9): avc: denied { map } for pid=1786 comm="syz-execprog" path="/root/syzkaller-shm832196559" 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 [ 37.160126] ------------[ cut here ]------------ [ 37.165021] kernel BUG at ./include/linux/skbuff.h:1406! [ 37.170539] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 37.176396] Modules linked in: [ 37.179568] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.139+ #34 [ 37.185992] task: (ptrval) task.stack: (ptrval) [ 37.192300] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 37.197196] RSP: 0018:ffff8881d7607bf8 EFLAGS: 00010206 [ 37.202678] RAX: ffffffff9ca30c40 RBX: ffff8881cdde0a80 RCX: 1ffff11039bbc199 [ 37.209924] RDX: 0000000000000100 RSI: ffff8881cb5adb80 RDI: ffff8881cb5adb88 [ 37.217168] RBP: ffff8881cb5adb80 R08: 0000000001080020 R09: ffff88821ffff008 [ 37.224420] R10: ffff88821ffff017 R11: ffff88821ffff010 R12: 0000000000000000 [ 37.231671] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881cdde0cd0 [ 37.238922] FS: 0000000000000000(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000 [ 37.247121] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.253116] CR2: 000000000075c000 CR3: 00000001d9e26006 CR4: 00000000001606b0 [ 37.260366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.267617] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.274878] Call Trace: [ 37.277438] [ 37.279593] tcp_write_wakeup+0x32b/0x570 [ 37.283717] ? tcp_write_timer_handler+0x780/0x780 [ 37.288619] ? tcp_write_timer_handler+0x780/0x780 [ 37.293608] tcp_send_probe0+0x46/0x3cc [ 37.297569] ? tcp_write_timer_handler+0x780/0x780 [ 37.302475] tcp_write_timer_handler+0x687/0x780 [ 37.307205] tcp_write_timer+0xc9/0x170 [ 37.311167] call_timer_fn+0x15b/0x6a0 [ 37.315033] ? collect_expired_timers+0x280/0x280 [ 37.319941] ? check_preemption_disabled+0x35/0x1f0 [ 37.324989] ? _raw_spin_unlock_irq+0x24/0x50 [ 37.329466] ? tcp_write_timer_handler+0x780/0x780 [ 37.339264] expire_timers+0x227/0x4c0 [ 37.343130] run_timer_softirq+0x1eb/0x5d0 [ 37.347338] ? expire_timers+0x4c0/0x4c0 [ 37.351375] ? check_preemption_disabled+0x35/0x1f0 [ 37.356364] ? check_preemption_disabled+0x35/0x1f0 [ 37.361361] __do_softirq+0x234/0x9ec [ 37.365137] ? check_preemption_disabled+0x35/0x1f0 [ 37.370128] irq_exit+0x114/0x150 [ 37.373560] smp_apic_timer_interrupt+0x1a7/0x650 [ 37.378377] apic_timer_interrupt+0x8c/0xa0 [ 37.382672] [ 37.384883] RIP: 0010:native_safe_halt+0x13/0x20 [ 37.389612] RSP: 0018:ffffffff9ca07d48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 37.397294] RAX: 0000000000000000 RBX: ffffffff9ce2dcc8 RCX: 0000000000000000 [ 37.404543] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff9ca3146c [ 37.411798] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 37.419046] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 37.426297] R13: 0000000000000000 R14: ffffffff9ca30c40 R15: dffffc0000000000 [ 37.433573] default_idle+0x61/0x3b0 [ 37.437318] do_idle+0x2e6/0x390 [ 37.440665] ? arch_cpu_idle_exit+0x40/0x40 [ 37.444960] ? check_preemption_disabled+0x35/0x1f0 [ 37.450078] cpu_startup_entry+0xc6/0xd0 [ 37.454188] ? cpu_in_idle+0x20/0x20 [ 37.457883] ? preempt_count_add+0xb8/0x180 [ 37.462188] ? trace_event_define_fields_x86_irq_vector+0x28/0x28 [ 37.468442] start_kernel+0x712/0x74a [ 37.472225] ? mem_encrypt_init+0x5/0x5 [ 37.476175] ? memcpy_orig+0x54/0x110 [ 37.479950] secondary_startup_64+0xa5/0xb0 [ 37.484247] 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 [ 37.503315] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881d7607bf8 [ 37.509589] ---[ end trace 1b9d44a7d5de3cb7 ]--- [ 37.514351] Kernel panic - not syncing: Fatal exception in interrupt [ 37.521190] Kernel Offset: 0x19600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 37.532161] Rebooting in 86400 seconds..