[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.442832] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.308470] random: sshd: uninitialized urandom read (32 bytes read) [ 28.652801] random: sshd: uninitialized urandom read (32 bytes read) [ 29.287444] random: sshd: uninitialized urandom read (32 bytes read) [ 33.859874] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 39.417259] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.544863] kasan: CONFIG_KASAN_INLINE enabled [ 39.549740] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.557119] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.563337] CPU: 0 PID: 5563 Comm: syz-executor716 Not tainted 4.19.0-rc3-next-20180913+ #73 [ 39.571889] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.581239] RIP: 0010:reconfigure_super+0x48e/0xbb0 [ 39.586237] Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff [ 39.605139] RSP: 0018:ffff8801b77278d8 EFLAGS: 00010206 [ 39.610505] RAX: 0000000000000000 RBX: ffff8801b77279f8 RCX: 0000000000000006 [ 39.617755] RDX: dffffc0000000000 RSI: ffffffff81cdbc5b RDI: 0000000000000030 [ 39.625007] RBP: ffff8801b77279c8 R08: ffff8801bb7781c0 R09: fffffbfff12c24e5 [ 39.632259] R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801d928e680 [ 39.639514] R13: 1ffff10036ee4f20 R14: 0000000000000000 R15: ffff8801b7727adc [ 39.646779] FS: 0000000001f01880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 39.655012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.660875] CR2: 00000000200000c0 CR3: 00000001d93b7000 CR4: 00000000001406f0 [ 39.668144] Call Trace: [ 39.670723] ? user_get_super+0x250/0x250 [ 39.674851] ? down_write+0x8a/0x130 [ 39.678545] ? do_umount_root+0x218/0x320 [ 39.682676] ? down_read+0x120/0x120 [ 39.686374] do_umount_root+0x2b1/0x320 [ 39.690332] ? namespace_unlock+0x210/0x210 [ 39.694638] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.700188] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.705711] ? ns_capable_common+0x13f/0x170 [ 39.710112] ksys_umount+0x8b6/0x1230 [ 39.713902] ? rcu_softirq_qs+0x20/0x20 [ 39.717857] ? dput.part.25+0x241/0x790 [ 39.721814] ? check_preemption_disabled+0x48/0x200 [ 39.726809] ? __detach_mounts+0x430/0x430 [ 39.731023] ? rcu_softirq_qs+0x20/0x20 [ 39.734975] ? mnt_get_count+0x150/0x150 [ 39.739015] ? dput.part.25+0x26d/0x790 [ 39.742972] ? shrink_dcache_sb+0x350/0x350 [ 39.747275] ? current_umask+0x70/0x70 [ 39.751146] ? do_syscall_64+0x9a/0x820 [ 39.755099] ? do_syscall_64+0x9a/0x820 [ 39.759053] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.763617] ? trace_hardirqs_on+0xbd/0x310 [ 39.767923] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.773269] ? trace_hardirqs_off_caller+0x300/0x300 [ 39.778363] ? ksys_mount+0xa8/0x140 [ 39.782065] __x64_sys_umount+0x54/0x80 [ 39.786035] do_syscall_64+0x1b9/0x820 [ 39.789911] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.795258] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.800167] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.805003] ? trace_hardirqs_off+0x310/0x310 [ 39.809479] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.814491] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.819498] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.824328] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.829510] RIP: 0033:0x440069 [ 39.832695] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 39.851582] RSP: 002b:00007ffcf308b4e8 EFLAGS: 00000217 ORIG_RAX: 00000000000000a6 [ 39.859275] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440069 [ 39.866527] RDX: 0000000000440069 RSI: 0000000000000000 RDI: 0000000020000040 [ 39.873777] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 39.881026] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018f0 [ 39.888288] R13: 0000000000401980 R14: 0000000000000000 R15: 0000000000000000 [ 39.895543] Modules linked in: [ 39.898811] ---[ end trace b41eea7577a38771 ]--- [ 39.903611] RIP: 0010:reconfigure_super+0x48e/0xbb0 [ 39.908625] Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff [ 39.927575] RSP: 0018:ffff8801b77278d8 EFLAGS: 00010206 [ 39.932966] RAX: 0000000000000000 RBX: ffff8801b77279f8 RCX: 0000000000000006 [ 39.940286] RDX: dffffc0000000000 RSI: ffffffff81cdbc5b RDI: 0000000000000030 [ 39.947555] RBP: ffff8801b77279c8 R08: ffff8801bb7781c0 R09: fffffbfff12c24e5 [ 39.954840] R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801d928e680 [ 39.962136] R13: 1ffff10036ee4f20 R14: 0000000000000000 R15: ffff8801b7727adc [ 39.969387] FS: 0000000001f01880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 39.977631] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.983532] CR2: 00000000200000c0 CR3: 00000001d93b7000 CR4: 00000000001406f0 [ 39.990821] Kernel panic - not syncing: Fatal exception [ 39.997062] Kernel Offset: disabled [ 40.000686] Rebooting in 86400 seconds..