[....] Starting OpenBSD Secure Shell server: sshd[ 11.579585] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.615931] random: sshd: uninitialized urandom read (32 bytes read) [ 20.001348] audit: type=1400 audit(1565424311.453:6): 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 [ 20.038695] random: sshd: uninitialized urandom read (32 bytes read) [ 20.559642] random: sshd: uninitialized urandom read (32 bytes read) [ 20.715590] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 26.215223] random: sshd: uninitialized urandom read (32 bytes read) [ 26.317483] audit: type=1400 audit(1565424317.763:7): avc: denied { map } for pid=1776 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 2019/08/10 08:05:18 parsed 1 programs [ 27.301153] audit: type=1400 audit(1565424318.753:8): avc: denied { map } for pid=1776 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 [ 27.822995] random: cc1: uninitialized urandom read (8 bytes read) 2019/08/10 08:05:20 executed programs: 0 [ 28.995740] audit: type=1400 audit(1565424320.443:9): avc: denied { map } for pid=1776 comm="syz-execprog" path="/root/syzkaller-shm324057342" 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 [ 31.370161] ------------[ cut here ]------------ [ 31.375167] kernel BUG at ./include/linux/skbuff.h:1406! [ 31.380737] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 31.386611] Modules linked in: [ 31.389787] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.138+ #30 [ 31.396176] task: (ptrval) task.stack: (ptrval) [ 31.402375] RIP: 0010:tcp_fragment+0x12c6/0x13e0 [ 31.407106] RSP: 0018:ffff8881dba07bf8 EFLAGS: 00010206 [ 31.412445] RAX: ffffffff95e30c40 RBX: ffff8881d39b9500 RCX: 1ffff1103a7372e9 [ 31.419704] RDX: 0000000000000100 RSI: ffff8881cd1f4c80 RDI: ffff8881cd1f4c88 [ 31.427089] RBP: ffff8881cd1f4c80 R08: 0000000001080020 R09: ffff88821ffff008 [ 31.434356] R10: ffff88821ffff017 R11: ffff88821ffff010 R12: 0000000000000000 [ 31.441606] R13: 0000000000001880 R14: 0000000001080020 R15: ffff8881d39b9750 [ 31.448905] FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 [ 31.457121] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.462987] CR2: 000000000075c000 CR3: 000000016a226001 CR4: 00000000001606b0 [ 31.470235] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.477705] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.484959] Call Trace: [ 31.487526] [ 31.489674] tcp_write_wakeup+0x32b/0x570 [ 31.493947] ? tcp_write_timer_handler+0x780/0x780 [ 31.498876] ? tcp_write_timer_handler+0x780/0x780 [ 31.503785] tcp_send_probe0+0x46/0x3cc [ 31.507883] ? tcp_write_timer_handler+0x780/0x780 [ 31.512806] tcp_write_timer_handler+0x687/0x780 [ 31.517550] tcp_write_timer+0xc9/0x170 [ 31.521508] call_timer_fn+0x15b/0x6a0 [ 31.525386] ? collect_expired_timers+0x280/0x280 [ 31.530212] ? check_preemption_disabled+0x35/0x1f0 [ 31.535217] ? _raw_spin_unlock_irq+0x24/0x50 [ 31.539696] ? tcp_write_timer_handler+0x780/0x780 [ 31.544603] expire_timers+0x227/0x4c0 [ 31.548504] run_timer_softirq+0x1eb/0x5d0 [ 31.552720] ? expire_timers+0x4c0/0x4c0 [ 31.556758] ? check_preemption_disabled+0x35/0x1f0 [ 31.561751] ? check_preemption_disabled+0x35/0x1f0 [ 31.566748] __do_softirq+0x234/0x9ec [ 31.570526] ? check_preemption_disabled+0x35/0x1f0 [ 31.575532] irq_exit+0x114/0x150 [ 31.578969] smp_apic_timer_interrupt+0x1a7/0x650 [ 31.583802] apic_timer_interrupt+0x8c/0xa0 [ 31.588101] [ 31.590329] RIP: 0010:native_safe_halt+0x13/0x20 [ 31.595059] RSP: 0018:ffffffff95e07d48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 31.602745] RAX: 0000000000000000 RBX: ffffffff9622dac8 RCX: 0000000000000000 [ 31.609992] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff95e3146c [ 31.617327] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 31.624574] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 31.631820] R13: 0000000000000000 R14: ffffffff95e30c40 R15: dffffc0000000000 [ 31.639141] default_idle+0x61/0x3b0 [ 31.642850] do_idle+0x2e6/0x390 [ 31.646197] ? arch_cpu_idle_exit+0x40/0x40 [ 31.650554] ? check_preemption_disabled+0x35/0x1f0 [ 31.655569] cpu_startup_entry+0xc6/0xd0 [ 31.659618] ? cpu_in_idle+0x20/0x20 [ 31.663320] ? preempt_count_add+0xb8/0x180 [ 31.667624] ? trace_event_define_fields_x86_irq_vector+0x28/0x28 [ 31.673845] start_kernel+0x712/0x74a [ 31.677625] ? mem_encrypt_init+0x5/0x5 [ 31.681639] ? memcpy_orig+0x54/0x110 [ 31.685426] secondary_startup_64+0xa5/0xb0 [ 31.689735] 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 5a fc da fe <0f> 0b e8 33 bf fd fe e9 4d ef ff ff e8 29 bf fd fe e9 2d f2 ff [ 31.709139] RIP: tcp_fragment+0x12c6/0x13e0 RSP: ffff8881dba07bf8 [ 31.715516] ---[ end trace 03140d88bf972157 ]--- [ 31.720266] Kernel panic - not syncing: Fatal exception in interrupt [ 31.727350] Kernel Offset: 0x12a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 31.738258] Rebooting in 86400 seconds..