[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.655602] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.101270] random: sshd: uninitialized urandom read (32 bytes read) [ 21.502406] random: sshd: uninitialized urandom read (32 bytes read) [ 22.167058] random: sshd: uninitialized urandom read (32 bytes read) [ 22.321373] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 27.781687] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.872701] kasan: CONFIG_KASAN_INLINE enabled [ 27.877368] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.884779] general protection fault: 0000 [#1] SMP KASAN [ 27.890324] CPU: 1 PID: 4462 Comm: syz-executor233 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 27.898797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.908188] RIP: 0010:do_remount_sb+0x371/0x850 [ 27.912833] Code: ff ff ff e8 01 85 fa 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff [ 27.931980] RSP: 0018:ffff8801ac117a38 EFLAGS: 00010202 [ 27.937333] RAX: dffffc0000000000 RBX: ffff8801caf68e40 RCX: ffffffff81c5edb2 [ 27.944608] RDX: 000000000000001c RSI: ffffffff81edb5ef RDI: 00000000000000e0 [ 27.951869] RBP: ffff8801ac117b40 R08: ffff8801ac1e2140 R09: fffffbfff11c24e5 [ 27.959125] R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801ac117b18 [ 27.966393] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 27.973738] FS: 0000000001440880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.981972] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.987841] CR2: 0000000020000680 CR3: 00000001ac28f000 CR4: 00000000001406e0 [ 27.995097] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.002352] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.009611] Call Trace: [ 28.012201] ? kpageflags_read+0x370/0x370 [ 28.016424] ? user_get_super+0x250/0x250 [ 28.020555] ? down_write+0x8f/0x130 [ 28.024255] ? ksys_umount+0x8c2/0x12f0 [ 28.028215] ? down_read+0x1d0/0x1d0 [ 28.031916] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.037441] ? ns_capable_common+0x13f/0x170 [ 28.041834] ksys_umount+0xfa7/0x12f0 [ 28.045619] ? lock_release+0xa30/0xa30 [ 28.049578] ? dput.part.26+0x248/0x7a0 [ 28.053541] ? __detach_mounts+0x430/0x430 [ 28.057772] ? do_raw_spin_unlock+0xa7/0x2f0 [ 28.062185] ? mntput_no_expire+0x18e/0xbc0 [ 28.066490] ? do_raw_spin_lock+0xc1/0x200 [ 28.070705] ? mnt_get_count+0x150/0x150 [ 28.074758] ? dput.part.26+0x276/0x7a0 [ 28.078716] ? shrink_dcache_sb+0x350/0x350 [ 28.083027] ? current_umask+0x70/0x70 [ 28.086917] ? mntput+0x74/0xa0 [ 28.090187] ? path_put+0x50/0x70 [ 28.093638] ? ksys_chroot+0x1aa/0x2f0 [ 28.097508] ? __ia32_sys_fchdir+0x1f0/0x1f0 [ 28.101899] ? ksys_mount+0xa8/0x140 [ 28.105594] __x64_sys_umount+0x54/0x80 [ 28.109554] do_syscall_64+0x1b9/0x820 [ 28.113431] ? syscall_return_slowpath+0x5e0/0x5e0 [ 28.118361] ? syscall_return_slowpath+0x31d/0x5e0 [ 28.123276] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 28.128277] ? prepare_exit_to_usermode+0x291/0x3b0 [ 28.133279] ? perf_trace_sys_enter+0xb10/0xb10 [ 28.137932] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.142765] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.147951] RIP: 0033:0x440069 [ 28.151119] 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 [ 28.170256] RSP: 002b:00007ffded829168 EFLAGS: 00000217 ORIG_RAX: 00000000000000a6 [ 28.177947] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440069 [ 28.185202] RDX: 0000000000440069 RSI: 0000000000000000 RDI: 0000000020000040 [ 28.192459] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.199714] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004018f0 [ 28.206967] R13: 0000000000401980 R14: 0000000000000000 R15: 0000000000000000 [ 28.214223] Modules linked in: [ 28.217399] Dumping ftrace buffer: [ 28.220915] (ftrace buffer empty) [ 28.224688] ---[ end trace e836fc74e88778be ]--- [ 28.229472] RIP: 0010:do_remount_sb+0x371/0x850 [ 28.234144] Code: ff ff ff e8 01 85 fa 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff [ 28.253411] RSP: 0018:ffff8801ac117a38 EFLAGS: 00010202 [ 28.258804] RAX: dffffc0000000000 RBX: ffff8801caf68e40 RCX: ffffffff81c5edb2 [ 28.266095] RDX: 000000000000001c RSI: ffffffff81edb5ef RDI: 00000000000000e0 [ 28.273381] RBP: ffff8801ac117b40 R08: ffff8801ac1e2140 R09: fffffbfff11c24e5 [ 28.280661] R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801ac117b18 [ 28.287947] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 28.295231] FS: 0000000001440880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.303467] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.309367] CR2: 0000000020000680 CR3: 00000001ac28f000 CR4: 00000000001406e0 [ 28.316651] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.323948] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.331226] Kernel panic - not syncing: Fatal exception [ 28.337008] Dumping ftrace buffer: [ 28.340532] (ftrace buffer empty) [ 28.344223] Kernel Offset: disabled [ 28.347855] Rebooting in 86400 seconds..