[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.402152] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.143682] random: sshd: uninitialized urandom read (32 bytes read) [ 29.414949] random: sshd: uninitialized urandom read (32 bytes read) [ 29.882743] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 35.651651] urandom_read: 1 callbacks suppressed [ 35.651654] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.736478] BUG: unable to handle kernel paging request at ffffeafff8f70020 [ 35.743822] IP: [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 35.750137] PGD 0 [ 35.752102] [ 35.753723] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.758194] Dumping ftrace buffer: [ 35.761703] (ftrace buffer empty) [ 35.765397] Modules linked in: [ 35.768676] CPU: 0 PID: 3793 Comm: syz-executor816 Not tainted 4.9.120-gf85543b #76 [ 35.776438] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.785765] task: ffff8801bb421800 task.stack: ffff8801bafd0000 [ 35.791791] RIP: 0010:[<ffffffff814f5147>] [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 35.800467] RSP: 0018:ffff8801bafd7948 EFLAGS: 00010246 [ 35.805892] RAX: dffffc0000000000 RBX: ffffeafff8f70000 RCX: 0000000000000000 [ 35.813246] RDX: 1ffffd5fff1ee004 RSI: ffffffff814f5128 RDI: ffffeafff8f70000 [ 35.820489] RBP: ffff8801bafd7970 R08: 0000000000034000 R09: 0000000000000001 [ 35.827734] R10: ffff8801bb421800 R11: 0000000000000001 R12: ffff8801bafd7c08 [ 35.834996] R13: ffffeafff8f70020 R14: ffffeafff8f70000 R15: 0000000000000001 [ 35.842245] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.850834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.856693] CR2: ffffeafff8f70020 CR3: 00000001c97cb000 CR4: 00000000001606f0 [ 35.864098] Stack: [ 35.866240] ffffeafff8f70020 ffff8801bafd7c08 ffff8801bff63800 ffffeafff8f70000 [ 35.874230] ffff8801bbb3e7e8 ffff8801bafd79c8 ffffffff8154bfcf ffff8801bafd7c18 [ 35.882213] ffff8801bafd7c10 ffff8801bafd7c88 00003ffe3dc001e0 00000001bff63000 [ 35.890190] Call Trace: [ 35.892751] [<ffffffff8154bfcf>] zap_huge_pmd+0x16f/0x860 [ 35.898353] [<ffffffff814ca80d>] unmap_page_range+0x12ad/0x1730 [ 35.904473] [<ffffffff814c9560>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 35.910763] [<ffffffff814cad91>] unmap_single_vma+0x101/0x260 [ 35.916704] [<ffffffff814cb6d2>] unmap_vmas+0x102/0x1d0 [ 35.922126] [<ffffffff814e40c4>] exit_mmap+0x214/0x3f0 [ 35.927458] [<ffffffff814e3eb0>] ? SyS_munmap+0xa0/0xa0 [ 35.932882] [<ffffffff8122e00a>] ? up_write+0x1a/0x60 [ 35.938129] [<ffffffff8112d5a3>] mmput+0xf3/0x2d0 [ 35.943034] [<ffffffff81142ad6>] do_exit+0x906/0x27b0 [ 35.948282] [<ffffffff811421d0>] ? release_task.part.19+0x1210/0x1210 [ 35.954920] [<ffffffff8122e00a>] ? up_write+0x1a/0x60 [ 35.960165] [<ffffffff814ec63d>] ? do_mprotect_pkey+0x71d/0x890 [ 35.966279] [<ffffffff814ebf20>] ? mprotect_fixup+0x930/0x930 [ 35.972221] [<ffffffff81579bc8>] ? SyS_pwrite64+0xe8/0x170 [ 35.977903] [<ffffffff81148c91>] do_group_exit+0x111/0x340 [ 35.983584] [<ffffffff81148ec0>] ? do_group_exit+0x340/0x340 [ 35.989439] [<ffffffff81148edd>] SyS_exit_group+0x1d/0x20 [ 35.995057] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 36.000742] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.007635] Code: 55 41 54 53 48 89 fb e8 c8 b6 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 93 b6 e6 [ 36.034382] RIP [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 36.040704] RSP <ffff8801bafd7948> [ 36.044307] CR2: ffffeafff8f70020 [ 36.047740] ---[ end trace 1df570389015a932 ]--- [ 36.052465] Kernel panic - not syncing: Fatal exception [ 36.058150] Dumping ftrace buffer: [ 36.061671] (ftrace buffer empty) [ 36.065352] Kernel Offset: disabled [ 36.068949] Rebooting in 86400 seconds..