[....] Starting OpenBSD Secure Shell server: sshd[ 25.292068] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.685660] random: sshd: uninitialized urandom read (32 bytes read) [ 29.007895] sshd (5550) used greatest stack depth: 16760 bytes left [ 29.029416] random: sshd: uninitialized urandom read (32 bytes read) [ 29.634257] random: sshd: uninitialized urandom read (32 bytes read) [ 46.267554] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 51.845301] random: sshd: uninitialized urandom read (32 bytes read) [ 51.976921] kasan: CONFIG_KASAN_INLINE enabled [ 51.981774] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 51.989536] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 51.995767] CPU: 1 PID: 5569 Comm: syz-executor465 Not tainted 4.19.0-rc3-next-20180912+ #72 [ 52.004332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.013687] RIP: 0010:mqueue_get_tree+0xba/0x2e0 [ 52.018432] Code: 4c 8d b3 98 00 00 00 4d 85 ed 0f 84 d1 00 00 00 e8 6b 44 3f fe 49 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e3 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b [ 52.037329] RSP: 0018:ffff8801d85ef928 EFLAGS: 00010202 [ 52.042687] RAX: dffffc0000000000 RBX: ffff8801cc74a900 RCX: ffffffff8160aca1 [ 52.049944] RDX: 010ea08e7621fe02 RSI: ffffffff833deb15 RDI: 08750473b10ff011 [ 52.057200] RBP: ffff8801d85ef948 R08: fffffbfff13555fd R09: fffffbfff13555fc [ 52.064452] R10: fffffbfff13555fc R11: ffffffff89aaafe3 R12: ffff8801d7ad3540 [ 52.071709] R13: 08750473b10ff009 R14: ffff8801cc74a998 R15: ffff8801cc74a998 [ 52.078973] FS: 00000000014c2940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 52.087187] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.093047] CR2: 0000000000474690 CR3: 00000001ce5cf000 CR4: 00000000001406e0 [ 52.100301] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.107566] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.114828] Call Trace: [ 52.117411] vfs_get_tree+0x1cb/0x5c0 [ 52.121199] mq_create_mount+0xe3/0x190 [ 52.125161] mq_init_ns+0x15a/0x210 [ 52.128772] copy_ipcs+0x3d2/0x580 [ 52.132309] ? ipcns_get+0xe0/0xe0 [ 52.135835] ? do_mount+0x1db0/0x1db0 [ 52.139831] ? kmem_cache_alloc+0x33a/0x730 [ 52.144141] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.149718] ? perf_event_namespaces+0x136/0x400 [ 52.154465] create_new_namespaces+0x376/0x900 [ 52.159040] ? sys_ni_syscall+0x20/0x20 [ 52.163005] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.168656] ? ns_capable_common+0x13f/0x170 [ 52.173051] unshare_nsproxy_namespaces+0xc3/0x1f0 [ 52.177967] ksys_unshare+0x79c/0x10b0 [ 52.181837] ? walk_process_tree+0x440/0x440 [ 52.186228] ? lock_downgrade+0x900/0x900 [ 52.190359] ? kasan_check_read+0x11/0x20 [ 52.194494] ? do_raw_spin_unlock+0xa7/0x2f0 [ 52.198886] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 52.203454] ? kasan_check_write+0x14/0x20 [ 52.207668] ? do_raw_read_unlock+0x3f/0x60 [ 52.212086] ? do_syscall_64+0x9a/0x820 [ 52.216042] ? do_syscall_64+0x9a/0x820 [ 52.220121] ? lockdep_hardirqs_on+0x421/0x5c0 [ 52.224690] ? trace_hardirqs_on+0xbd/0x310 [ 52.229002] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.234598] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 52.240169] ? __ia32_sys_prlimit64+0x8c0/0x8c0 [ 52.244824] __x64_sys_unshare+0x31/0x40 [ 52.248887] do_syscall_64+0x1b9/0x820 [ 52.252767] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 52.258127] ? syscall_return_slowpath+0x5e0/0x5e0 [ 52.263038] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.267968] ? trace_hardirqs_on_caller+0x310/0x310 [ 52.273005] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 52.278012] ? prepare_exit_to_usermode+0x291/0x3b0 [ 52.283014] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.287847] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.293024] RIP: 0033:0x44b537 [ 52.296209] Code: 00 00 00 b8 63 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd d5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9d d5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 52.315098] RSP: 002b:00007ffd938e2da8 EFLAGS: 00000217 ORIG_RAX: 0000000000000110 [ 52.322790] RAX: ffffffffffffffda RBX: 00007ffd938e3970 RCX: 000000000044b537 [ 52.330059] RDX: 0000000000000000 RSI: 00007ffd938e2db0 RDI: 0000000008000000 [ 52.337314] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000018 [ 52.344569] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000408f60 [ 52.351846] R13: 0000000000408ff0 R14: 0000000000000000 R15: 0000000000000000 [ 52.359101] Modules linked in: [ 52.362567] ---[ end trace 486a2ede4bfd675a ]--- [ 52.367368] RIP: 0010:mqueue_get_tree+0xba/0x2e0 [ 52.372117] Code: 4c 8d b3 98 00 00 00 4d 85 ed 0f 84 d1 00 00 00 e8 6b 44 3f fe 49 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e3 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b [ 52.391049] RSP: 0018:ffff8801d85ef928 EFLAGS: 00010202 [ 52.396418] RAX: dffffc0000000000 RBX: ffff8801cc74a900 RCX: ffffffff8160aca1 [ 52.403673] RDX: 010ea08e7621fe02 RSI: ffffffff833deb15 RDI: 08750473b10ff011 [ 52.410974] RBP: ffff8801d85ef948 R08: fffffbfff13555fd R09: fffffbfff13555fc [ 52.418248] R10: fffffbfff13555fc R11: ffffffff89aaafe3 R12: ffff8801d7ad3540 [ 52.425624] R13: 08750473b10ff009 R14: ffff8801cc74a998 R15: ffff8801cc74a998 [ 52.432928] FS: 00000000014c2940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 52.441168] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.447078] CR2: 0000000000474690 CR3: 00000001ce5cf000 CR4: 00000000001406e0 [ 52.454340] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.461642] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.468918] Kernel panic - not syncing: Fatal exception [ 52.475296] Kernel Offset: disabled [ 52.478920] Rebooting in 86400 seconds..