[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.701858] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.802678] random: sshd: uninitialized urandom read (32 bytes read) [ 16.011061] random: sshd: uninitialized urandom read (32 bytes read) [ 16.523186] random: sshd: uninitialized urandom read (32 bytes read) [ 37.907543] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 43.525857] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.608459] BUG: unable to handle kernel paging request at ffffeafff8d50020 [ 43.616159] IP: [] page_remove_rmap+0x37/0x6d0 [ 43.622426] PGD 0 [ 43.624371] [ 43.625991] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.630464] Dumping ftrace buffer: [ 43.633979] (ftrace buffer empty) [ 43.637664] Modules linked in: [ 43.640953] CPU: 0 PID: 3811 Comm: syz-executor538 Not tainted 4.9.122-g54068d6 #78 [ 43.648722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.658052] task: ffff8801b7960000 task.stack: ffff8801d90a8000 [ 43.664195] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 43.672992] RSP: 0018:ffff8801d90af948 EFLAGS: 00010246 [ 43.678418] RAX: dffffc0000000000 RBX: ffffeafff8d50000 RCX: 0000000000000000 [ 43.685766] RDX: 1ffffd5fff1aa004 RSI: ffffffff814f5918 RDI: ffffeafff8d50000 [ 43.693018] RBP: ffff8801d90af970 R08: 0000000000034980 R09: 0000000000000001 [ 43.700271] R10: ffff8801b7960000 R11: 0000000000000001 R12: ffff8801d90afc08 [ 43.707520] R13: ffffeafff8d50020 R14: ffffeafff8d50000 R15: 0000000000000001 [ 43.714771] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 43.722974] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.728830] CR2: ffffeafff8d50020 CR3: 00000001c3cac000 CR4: 00000000001606f0 [ 43.736090] Stack: [ 43.738303] ffffeafff8d50020 ffff8801d90afc08 ffff8801c3c54800 ffffeafff8d50000 [ 43.746413] ffff8801c9268000 ffff8801d90af9c8 ffffffff8154cb8f ffff8801d90afc18 [ 43.754417] ffff8801d90afc10 ffff8801d90afc88 00003ffe354001e0 00000001c3c54000 [ 43.762453] Call Trace: [ 43.765024] [] zap_huge_pmd+0x16f/0x860 [ 43.770631] [] unmap_page_range+0x12ad/0x1730 [ 43.776760] [] ? vm_normal_page_pmd+0x310/0x310 [ 43.783061] [] unmap_single_vma+0x101/0x260 [ 43.789012] [] unmap_vmas+0x102/0x1d0 [ 43.794501] [] exit_mmap+0x214/0x3f0 [ 43.799946] [] ? SyS_munmap+0xa0/0xa0 [ 43.805385] [] ? up_write+0x1a/0x60 [ 43.810647] [] mmput+0xf3/0x2d0 [ 43.815555] [] do_exit+0x906/0x27b0 [ 43.820984] [] ? release_task.part.19+0x1210/0x1210 [ 43.827640] [] ? up_write+0x1a/0x60 [ 43.832897] [] ? do_mprotect_pkey+0x71d/0x890 [ 43.839022] [] ? mprotect_fixup+0x930/0x930 [ 43.844976] [] do_group_exit+0x111/0x340 [ 43.850666] [] ? do_group_exit+0x340/0x340 [ 43.856529] [] SyS_exit_group+0x1d/0x20 [ 43.862132] [] do_syscall_64+0x1a6/0x490 [ 43.867934] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.874831] Code: 55 41 54 53 48 89 fb e8 58 b4 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 23 b4 e6 [ 43.885336] RIP [ 43.885347] [] page_remove_rmap+0x37/0x6d0 RSP [ 43.885352] CR2: ffffeafff8d50020 [ 43.885360] ---[ end trace bc9c2cfe4eec46cd ]--- [ 43.885364] Kernel panic - not syncing: Fatal exception [ 43.889393] Dumping ftrace buffer: [ 43.889397] (ftrace buffer empty) [ 43.889398] Kernel Offset: disabled [ 43.931722] Rebooting in 86400 seconds..