[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 10.046696] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 12.621918] random: sshd: uninitialized urandom read (32 bytes read) [ 12.767398] audit: type=1400 audit(1566145852.393:6): avc: denied { map } for pid=1755 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 [ 12.809740] random: sshd: uninitialized urandom read (32 bytes read) [ 13.331989] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts. [ 18.929161] urandom_read: 1 callbacks suppressed [ 18.929165] random: sshd: uninitialized urandom read (32 bytes read) [ 19.028697] audit: type=1400 audit(1566145858.653:7): avc: denied { map } for pid=1767 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 16:30:59 parsed 1 programs [ 19.929144] audit: type=1400 audit(1566145859.553:8): avc: denied { map } for pid=1767 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 [ 20.466075] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/18 16:31:01 executed programs: 0 [ 21.561469] audit: type=1400 audit(1566145861.193:9): avc: denied { map } for pid=1767 comm="syz-execprog" path="/root/syzkaller-shm507164935" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 [ 23.860123] ------------[ cut here ]------------ [ 23.865201] kernel BUG at ./include/linux/skbuff.h:1406! [ 23.870743] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 23.876598] Modules linked in: [ 23.879763] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.139+ #34 [ 23.886137] task: (ptrval) task.stack: (ptrval) [ 23.892169] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 23.896895] RSP: 0018:ffff8881dba07bf8 EFLAGS: 00010206 [ 23.902225] RAX: ffffffff8da30c40 RBX: ffff8881d2f10a80 RCX: 1ffff1103a5e2199 [ 23.909466] RDX: 0000000000000100 RSI: ffff8881d606aa00 RDI: ffff8881d606aa08 [ 23.916844] RBP: ffff8881d606aa00 R08: 0000000001080020 R09: ffff88821fffd008 [ 23.924087] R10: ffff88821fffd017 R11: ffff88821fffd010 R12: 0000000000000000 [ 23.931324] R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881d2f10cd0 [ 23.938650] FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 [ 23.946849] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.952710] CR2: 000000000075c000 CR3: 0000000027026006 CR4: 00000000001606b0 [ 23.959998] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.967245] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.974486] Call Trace: [ 23.977045] [ 23.979177] tcp_write_wakeup+0x32b/0x570 [ 23.983296] ? tcp_write_timer_handler+0x780/0x780 [ 23.988196] ? tcp_write_timer_handler+0x780/0x780 [ 23.993097] tcp_send_probe0+0x46/0x3cc [ 23.997044] ? tcp_write_timer_handler+0x780/0x780 [ 24.001945] tcp_write_timer_handler+0x687/0x780 [ 24.006670] tcp_write_timer+0xc9/0x170 [ 24.010618] call_timer_fn+0x15b/0x6a0 [ 24.014476] ? collect_expired_timers+0x280/0x280 [ 24.019291] ? check_preemption_disabled+0x35/0x1f0 [ 24.024277] ? _raw_spin_unlock_irq+0x24/0x50 [ 24.028749] ? tcp_write_timer_handler+0x780/0x780 [ 24.033646] expire_timers+0x227/0x4c0 [ 24.037507] run_timer_softirq+0x1eb/0x5d0 [ 24.041713] ? expire_timers+0x4c0/0x4c0 [ 24.045750] ? check_preemption_disabled+0x35/0x1f0 [ 24.050740] ? check_preemption_disabled+0x35/0x1f0 [ 24.055730] __do_softirq+0x234/0x9ec [ 24.059508] ? check_preemption_disabled+0x35/0x1f0 [ 24.064500] irq_exit+0x114/0x150 [ 24.067927] smp_apic_timer_interrupt+0x1a7/0x650 [ 24.072747] apic_timer_interrupt+0x8c/0xa0 [ 24.077053] [ 24.079276] RIP: 0010:native_safe_halt+0x13/0x20 [ 24.084000] RSP: 0018:ffffffff8da07d48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 24.091683] RAX: 0000000000000000 RBX: ffffffff8de2dcc8 RCX: 0000000000000000 [ 24.098924] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8da3146c [ 24.106302] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 24.113549] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.120792] R13: 0000000000000000 R14: ffffffff8da30c40 R15: dffffc0000000000 [ 24.128040] default_idle+0x61/0x3b0 [ 24.131726] do_idle+0x2e6/0x390 [ 24.135110] ? arch_cpu_idle_exit+0x40/0x40 [ 24.139456] cpu_startup_entry+0xc6/0xd0 [ 24.143503] ? cpu_in_idle+0x20/0x20 [ 24.147188] ? preempt_count_add+0xb8/0x180 [ 24.151492] ? trace_event_define_fields_x86_irq_vector+0x28/0x28 [ 24.157695] start_kernel+0x712/0x74a [ 24.161470] ? mem_encrypt_init+0x5/0x5 [ 24.165416] ? memcpy_orig+0x54/0x110 [ 24.169200] secondary_startup_64+0xa5/0xb0 [ 24.173493] 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 [ 24.192552] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881dba07bf8 [ 24.198831] ---[ end trace 110785b91c314bc9 ]--- [ 24.203567] Kernel panic - not syncing: Fatal exception in interrupt [ 24.210505] Kernel Offset: 0xa600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 24.221310] Rebooting in 86400 seconds..