[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.343616] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.618988] random: sshd: uninitialized urandom read (32 bytes read) [ 22.009174] random: sshd: uninitialized urandom read (32 bytes read) [ 22.517560] random: sshd: uninitialized urandom read (32 bytes read) [ 22.655351] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 28.171917] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.258283] BUG: unable to handle kernel paging request at ffffeafff8de8020 [ 28.265649] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.271891] PGD 0 [ 28.273835] [ 28.275463] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.279929] Dumping ftrace buffer: [ 28.283452] (ftrace buffer empty) [ 28.287141] Modules linked in: [ 28.290434] CPU: 1 PID: 3763 Comm: syz-executor062 Not tainted 4.9.121-g681e57b #77 [ 28.298199] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.307702] task: ffff8801bc978000 task.stack: ffff8801bba38000 [ 28.313732] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.322406] RSP: 0018:ffff8801bba3f948 EFLAGS: 00010246 [ 28.327830] RAX: dffffc0000000000 RBX: ffffeafff8de8000 RCX: 0000000000000000 [ 28.335074] RDX: 1ffffd5fff1bd004 RSI: ffffffff814f5278 RDI: ffffeafff8de8000 [ 28.342319] RBP: ffff8801bba3f970 R08: 0000000000034780 R09: 0000000000000001 [ 28.349565] R10: ffff8801bc978000 R11: 0000000000000001 R12: ffff8801bba3fc08 [ 28.356817] R13: ffffeafff8de8020 R14: ffffeafff8de8000 R15: 0000000000000001 [ 28.364066] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.372264] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.378119] CR2: ffffeafff8de8020 CR3: 00000001ca7b8000 CR4: 00000000001606f0 [ 28.385405] Stack: [ 28.387546] ffffeafff8de8020 ffff8801bba3fc08 ffff8801c755f800 ffffeafff8de8000 [ 28.395590] ffff8801c7774370 ffff8801bba3f9c8 ffffffff8154c20f ffff8801bba3fc18 [ 28.403632] ffff8801bba3fc10 ffff8801bba3fc88 00003ffe37a001e0 00000001c755f000 [ 28.411614] Call Trace: [ 28.414177] [] zap_huge_pmd+0x16f/0x860 [ 28.419780] [] unmap_page_range+0x12ad/0x1730 [ 28.425901] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.432192] [] unmap_single_vma+0x101/0x260 [ 28.438137] [] unmap_vmas+0x102/0x1d0 [ 28.443561] [] exit_mmap+0x214/0x3f0 [ 28.448896] [] ? SyS_munmap+0xa0/0xa0 [ 28.454318] [] ? up_write+0x1a/0x60 [ 28.459573] [] mmput+0xf3/0x2d0 [ 28.464490] [] do_exit+0x906/0x27b0 [ 28.469742] [] ? release_task.part.19+0x1210/0x1210 [ 28.476379] [] ? up_write+0x1a/0x60 [ 28.481628] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.487747] [] ? mprotect_fixup+0x930/0x930 [ 28.493696] [] do_group_exit+0x111/0x340 [ 28.499386] [] ? do_group_exit+0x340/0x340 [ 28.505242] [] SyS_exit_group+0x1d/0x20 [ 28.510839] [] do_syscall_64+0x1a6/0x490 [ 28.516523] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.523424] 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 [ 28.550874] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.557205] RSP [ 28.560803] CR2: ffffeafff8de8020 [ 28.564228] ---[ end trace 7bb6d862f8ec82d9 ]--- [ 28.568965] Kernel panic - not syncing: Fatal exception [ 28.574616] Dumping ftrace buffer: [ 28.578132] (ftrace buffer empty) [ 28.581814] Kernel Offset: disabled [ 28.585410] Rebooting in 86400 seconds..