[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 31.503537] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.545816] random: sshd: uninitialized urandom read (32 bytes read) [ 35.991534] random: sshd: uninitialized urandom read (32 bytes read) [ 37.436405] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 43.116769] random: sshd: uninitialized urandom read (32 bytes read) 2018/07/04 05:38:12 fuzzer started [ 44.500358] random: cc1: uninitialized urandom read (8 bytes read) 2018/07/04 05:38:14 dialing manager at 10.128.0.26:34161 2018/07/04 05:38:18 syscalls: 1541 2018/07/04 05:38:18 code coverage: enabled 2018/07/04 05:38:18 comparison tracing: ioctl(KCOV_TRACE_CMP) failed: errno 524 2018/07/04 05:38:18 setuid sandbox: enabled 2018/07/04 05:38:18 namespace sandbox: enabled 2018/07/04 05:38:18 fault injection: enabled 2018/07/04 05:38:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2018/07/04 05:38:18 net packed injection: enabled [ 51.149086] random: crng init done [ 74.308945] ================================================================== [ 74.316390] BUG: KMSAN: uninit-value in tcp_gro_receive+0x1371/0x1ec0 [ 74.323003] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.17.0+ #17 [ 74.329212] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.338549] Call Trace: [ 74.341107] [ 74.343238] dump_stack+0x185/0x1d0 [ 74.346842] kmsan_report+0x188/0x2a0 [ 74.350624] __msan_warning_32+0x70/0xc0 [ 74.354675] tcp_gro_receive+0x1371/0x1ec0 [ 74.358889] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.363707] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 74.369145] tcp4_gro_receive+0x3df/0xc30 [ 74.373268] ? inet_gso_segment+0x1c10/0x1c10 [ 74.377738] inet_gro_receive+0x15f9/0x1950 [ 74.382039] ? tcp4_gso_segment+0x630/0x630 [ 74.386340] ? inet_gso_segment+0x1c10/0x1c10 [ 74.390820] dev_gro_receive+0x214c/0x32e0 [ 74.395033] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.399850] napi_gro_receive+0x624/0xb60 [ 74.403976] receive_buf+0x4c96/0x6ae0 [ 74.407843] virtnet_poll+0x8ff/0x1420 [ 74.411705] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.416530] ? refill_work+0x2c0/0x2c0 [ 74.420408] net_rx_action+0x766/0x1a80 [ 74.424359] ? net_rx_action+0x1/0x1a80 [ 74.428315] ? net_tx_action+0xad0/0xad0 [ 74.432353] __do_softirq+0x592/0x979 [ 74.436131] irq_exit+0x207/0x240 [ 74.439560] exiting_irq+0xe/0x10 [ 74.442985] do_IRQ+0x17d/0x1c0 [ 74.446236] common_interrupt+0xf/0xf [ 74.450009] [ 74.452221] RIP: 0010:default_idle+0x20b/0x3e0 [ 74.456775] RSP: 0018:ffff8801d1e4fdf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5 [ 74.464468] RAX: ffff8801fd432f18 RBX: 0000000000000000 RCX: ffff8801fd032f18 [ 74.471714] RDX: ffff8801fd032f18 RSI: aaaaaaaaaaaab000 RDI: ffffea00004212c0 [ 74.478958] RBP: ffff8801d1e4fe28 R08: 0000000001080020 R09: 0000000000000002 [ 74.486202] R10: 0000000000000000 R11: ffffffff89ff18c0 R12: ffff8801d1e4fe8f [ 74.493452] R13: ffff8801d1cdd7c0 R14: ffff8801d1e4fe8c R15: ffff8801d1cde098 [ 74.500703] ? __cpuidle_text_start+0x8/0x8 [ 74.505000] ? __cpuidle_text_start+0x8/0x8 [ 74.509296] arch_cpu_idle+0x26/0x30 [ 74.512985] do_idle+0x36d/0x830 [ 74.516327] cpu_startup_entry+0x45/0x50 [ 74.520367] ? setup_APIC_timer+0x220/0x220 [ 74.524666] start_secondary+0x3c6/0x490 [ 74.528704] secondary_startup_64+0xa5/0xb0 [ 74.533004] [ 74.534617] Local variable description: ----list@net_rx_action [ 74.540556] Variable was created at: [ 74.544245] net_rx_action+0x6e/0x1a80 [ 74.548116] __do_softirq+0x592/0x979 [ 74.553710] ================================================================== [ 74.561042] Disabling lock debugging due to kernel taint [ 74.566464] Kernel panic - not syncing: panic_on_warn set ... [ 74.566464] [ 74.573805] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 4.17.0+ #17 [ 74.581399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.590746] Call Trace: [ 74.593313] [ 74.595443] dump_stack+0x185/0x1d0 [ 74.599048] panic+0x3d0/0x990 [ 74.602222] kmsan_report+0x29e/0x2a0 [ 74.606000] __msan_warning_32+0x70/0xc0 [ 74.610039] tcp_gro_receive+0x1371/0x1ec0 [ 74.614250] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.619070] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 74.624517] tcp4_gro_receive+0x3df/0xc30 [ 74.628645] ? inet_gso_segment+0x1c10/0x1c10 [ 74.633117] inet_gro_receive+0x15f9/0x1950 [ 74.637417] ? tcp4_gso_segment+0x630/0x630 [ 74.641724] ? inet_gso_segment+0x1c10/0x1c10 [ 74.646194] dev_gro_receive+0x214c/0x32e0 [ 74.650406] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.655757] napi_gro_receive+0x624/0xb60 [ 74.659884] receive_buf+0x4c96/0x6ae0 [ 74.663756] virtnet_poll+0x8ff/0x1420 [ 74.667624] ? kmsan_set_origin_inline+0x6b/0x120 [ 74.672458] ? refill_work+0x2c0/0x2c0 [ 74.676321] net_rx_action+0x766/0x1a80 [ 74.680274] ? net_rx_action+0x1/0x1a80 [ 74.684221] ? net_tx_action+0xad0/0xad0 [ 74.688260] __do_softirq+0x592/0x979 [ 74.692037] irq_exit+0x207/0x240 [ 74.695467] exiting_irq+0xe/0x10 [ 74.698895] do_IRQ+0x17d/0x1c0 [ 74.702151] common_interrupt+0xf/0xf [ 74.705922] [ 74.708136] RIP: 0010:default_idle+0x20b/0x3e0 [ 74.712690] RSP: 0018:ffff8801d1e4fdf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5 [ 74.720375] RAX: ffff8801fd432f18 RBX: 0000000000000000 RCX: ffff8801fd032f18 [ 74.727623] RDX: ffff8801fd032f18 RSI: aaaaaaaaaaaab000 RDI: ffffea00004212c0 [ 74.734871] RBP: ffff8801d1e4fe28 R08: 0000000001080020 R09: 0000000000000002 [ 74.742116] R10: 0000000000000000 R11: ffffffff89ff18c0 R12: ffff8801d1e4fe8f [ 74.749363] R13: ffff8801d1cdd7c0 R14: ffff8801d1e4fe8c R15: ffff8801d1cde098 [ 74.756618] ? __cpuidle_text_start+0x8/0x8 [ 74.760934] ? __cpuidle_text_start+0x8/0x8 [ 74.765235] arch_cpu_idle+0x26/0x30 [ 74.768927] do_idle+0x36d/0x830 [ 74.772273] cpu_startup_entry+0x45/0x50 [ 74.776309] ? setup_APIC_timer+0x220/0x220 [ 74.780611] start_secondary+0x3c6/0x490 [ 74.784650] secondary_startup_64+0xa5/0xb0 [ 74.789755] Dumping ftrace buffer: [ 74.793281] (ftrace buffer empty) [ 74.796968] Kernel Offset: disabled [ 74.800571] Rebooting in 86400 seconds..