[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.424646] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.358492] random: sshd: uninitialized urandom read (32 bytes read) [ 16.713885] random: sshd: uninitialized urandom read (32 bytes read) [ 17.369463] random: sshd: uninitialized urandom read (32 bytes read) [ 17.502609] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 23.659248] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.739008] kasan: CONFIG_KASAN_INLINE enabled [ 23.743642] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.751014] general protection fault: 0000 [#1] SMP KASAN [ 23.756543] CPU: 1 PID: 4415 Comm: syz-executor204 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 23.765011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.774357] RIP: 0010:cgroup_reconfigure+0x25/0x80 [ 23.779258] Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff [ 23.798370] RSP: 0018:ffff8801acc1f9f8 EFLAGS: 00010206 [ 23.803719] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81c5edb2 [ 23.810971] RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090 [ 23.818227] RBP: ffff8801acc1fa00 R08: ffff8801ad2e45c0 R09: fffffbfff11c24e5 [ 23.825474] R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940 [ 23.832721] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 23.839967] FS: 00000000016f3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 23.848168] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.854034] CR2: 0000000020000000 CR3: 00000001b24ea000 CR4: 00000000001406e0 [ 23.861284] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.868529] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.875771] Call Trace: [ 23.878344] ? apply_cgroup_root_flags+0x120/0x120 [ 23.883252] kernfs_sop_reconfigure+0xba/0x100 [ 23.887817] do_remount_sb+0x34f/0x850 [ 23.891681] ? kpageflags_read+0x370/0x370 [ 23.895904] ? user_get_super+0x250/0x250 [ 23.900035] ? down_write+0x8f/0x130 [ 23.903727] ? ksys_umount+0x8c2/0x12f0 [ 23.907690] ? down_read+0x1d0/0x1d0 [ 23.911388] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.916907] ? ns_capable_common+0x13f/0x170 [ 23.921304] ksys_umount+0xfa7/0x12f0 [ 23.925088] ? lock_release+0xa30/0xa30 [ 23.929044] ? dput.part.26+0x248/0x7a0 [ 23.933001] ? __detach_mounts+0x430/0x430 [ 23.937222] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.941614] ? mntput_no_expire+0x18e/0xbc0 [ 23.945918] ? do_raw_spin_lock+0xc1/0x200 [ 23.950145] ? mnt_get_count+0x150/0x150 [ 23.954182] ? dput.part.26+0x276/0x7a0 [ 23.958134] ? shrink_dcache_sb+0x350/0x350 [ 23.962440] ? current_umask+0x70/0x70 [ 23.966315] ? mntput+0x74/0xa0 [ 23.969575] ? path_put+0x50/0x70 [ 23.973007] ? ksys_chroot+0x1aa/0x2f0 [ 23.976883] ? __ia32_sys_fchdir+0x1f0/0x1f0 [ 23.981270] ? ksys_mount+0xa8/0x140 [ 23.984961] __x64_sys_umount+0x54/0x80 [ 23.988920] do_syscall_64+0x1b9/0x820 [ 23.992788] ? syscall_return_slowpath+0x5e0/0x5e0 [ 23.997693] ? syscall_return_slowpath+0x31d/0x5e0 [ 24.002600] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 24.007598] ? prepare_exit_to_usermode+0x291/0x3b0 [ 24.012591] ? perf_trace_sys_enter+0xb10/0xb10 [ 24.017251] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.022075] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 24.027242] RIP: 0033:0x440059 [ 24.030404] 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 [ 24.049521] RSP: 002b:00007ffe8d0cd578 EFLAGS: 00000217 ORIG_RAX: 00000000000000a6 [ 24.057207] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440059 [ 24.064456] RDX: 0000000000440059 RSI: 0000000000000000 RDI: 0000000020000040 [ 24.071704] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 24.078958] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004018e0 [ 24.086211] R13: 0000000000401970 R14: 0000000000000000 R15: 0000000000000000 [ 24.093469] Modules linked in: [ 24.096641] Dumping ftrace buffer: [ 24.100155] (ftrace buffer empty) [ 24.103922] ---[ end trace 2c2a1923aa2ae1cb ]--- [ 24.108694] RIP: 0010:cgroup_reconfigure+0x25/0x80 [ 24.113617] Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff [ 24.132858] RSP: 0018:ffff8801acc1f9f8 EFLAGS: 00010206 [ 24.138226] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81c5edb2 [ 24.145500] RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090 [ 24.152771] RBP: ffff8801acc1fa00 R08: ffff8801ad2e45c0 R09: fffffbfff11c24e5 [ 24.160042] R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940 [ 24.167331] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 24.174603] FS: 00000000016f3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 24.182825] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.188703] CR2: 0000000020000000 CR3: 00000001b24ea000 CR4: 00000000001406e0 [ 24.196005] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.203290] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.210553] Kernel panic - not syncing: Fatal exception [ 24.216354] Dumping ftrace buffer: [ 24.219876] (ftrace buffer empty) [ 24.223566] Kernel Offset: disabled [ 24.227172] Rebooting in 86400 seconds..