[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.254125] 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: [ 15.492976] random: sshd: uninitialized urandom read (32 bytes read) [ 15.942964] random: sshd: uninitialized urandom read (32 bytes read) [ 16.409596] random: sshd: uninitialized urandom read (32 bytes read) [ 16.552942] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 22.025706] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.111422] BUG: unable to handle kernel paging request at ffffeafff8f88020 [ 22.118804] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.125058] PGD 0 [ 22.127013] [ 22.128637] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.133103] Dumping ftrace buffer: [ 22.136616] (ftrace buffer empty) [ 22.140300] Modules linked in: [ 22.143585] CPU: 1 PID: 3731 Comm: syz-executor126 Not tainted 4.9.121-g681e57b #25 [ 22.151351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.160686] task: ffff8801bf2f4800 task.stack: ffff8801bf190000 [ 22.166734] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.175423] RSP: 0018:ffff8801bf197948 EFLAGS: 00010246 [ 22.180850] RAX: dffffc0000000000 RBX: ffffeafff8f88000 RCX: 0000000000000000 [ 22.188102] RDX: 1ffffd5fff1f1004 RSI: ffffffff814f5278 RDI: ffffeafff8f88000 [ 22.195457] RBP: ffff8801bf197970 R08: 00000000000336e0 R09: 0000000000000001 [ 22.202763] R10: ffff8801bf2f4800 R11: 0000000000000001 R12: ffff8801bf197c08 [ 22.210014] R13: ffffeafff8f88020 R14: ffffeafff8f88000 R15: 0000000000000001 [ 22.217278] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.225537] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.231400] CR2: ffffeafff8f88020 CR3: 00000001c79b4000 CR4: 00000000001606f0 [ 22.238649] Stack: [ 22.240779] ffffeafff8f88020 ffff8801bf197c08 ffff8801c6b6a800 ffffeafff8f88000 [ 22.248786] ffff8801bf047f78 ffff8801bf1979c8 ffffffff8154c20f ffff8801bf197c18 [ 22.256811] ffff8801bf197c10 ffff8801bf197c88 00003ffe3e2001e0 00000001c6b6a000 [ 22.264801] Call Trace: [ 22.267372] [] zap_huge_pmd+0x16f/0x860 [ 22.272979] [] unmap_page_range+0x12ad/0x1730 [ 22.279108] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.285410] [] unmap_single_vma+0x101/0x260 [ 22.291358] [] unmap_vmas+0x102/0x1d0 [ 22.296781] [] exit_mmap+0x214/0x3f0 [ 22.302122] [] ? SyS_munmap+0xa0/0xa0 [ 22.307549] [] ? up_write+0x1a/0x60 [ 22.312808] [] mmput+0xf3/0x2d0 [ 22.317717] [] do_exit+0x906/0x27b0 [ 22.322971] [] ? release_task.part.19+0x1210/0x1210 [ 22.329614] [] ? up_write+0x1a/0x60 [ 22.334865] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.340987] [] ? mprotect_fixup+0x930/0x930 [ 22.346936] [] ? SyS_pwrite64+0xe8/0x170 [ 22.352628] [] do_group_exit+0x111/0x340 [ 22.358320] [] ? do_group_exit+0x340/0x340 [ 22.364300] [] SyS_exit_group+0x1d/0x20 [ 22.369913] [] do_syscall_64+0x1a6/0x490 [ 22.375654] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.382590] 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 [ 22.382662] RIP [ 22.382669] [] page_remove_rmap+0x37/0x6d0 RSP [ 22.382673] CR2: ffffeafff8f88020 [ 22.382680] ---[ end trace 6425163475ee90a8 ]--- [ 22.382683] Kernel panic - not syncing: Fatal exception [ 22.390888] Dumping ftrace buffer: [ 22.390891] (ftrace buffer empty) [ 22.390893] Kernel Offset: disabled [ 22.436655] Rebooting in 86400 seconds..