[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.332859] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.225660] random: sshd: uninitialized urandom read (32 bytes read) [ 18.723065] random: sshd: uninitialized urandom read (32 bytes read) [ 19.205113] random: sshd: uninitialized urandom read (32 bytes read) [ 19.339307] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 24.930195] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.014802] BUG: unable to handle kernel paging request at ffffeafff9078020 [ 25.022177] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.028435] PGD 0 [ 25.030380] [ 25.032000] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.036698] Dumping ftrace buffer: [ 25.040214] (ftrace buffer empty) [ 25.043901] Modules linked in: [ 25.047202] CPU: 1 PID: 3793 Comm: syz-executor884 Not tainted 4.9.120-gf85543b #76 [ 25.054974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.064424] task: ffff8801b8b5c800 task.stack: ffff8801c62b0000 [ 25.070515] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.079254] RSP: 0018:ffff8801c62b7948 EFLAGS: 00010246 [ 25.084742] RAX: dffffc0000000000 RBX: ffffeafff9078000 RCX: ffffea0006f80000 [ 25.091992] RDX: 1ffffd5fff20f004 RSI: ffffffff814f5128 RDI: ffffeafff9078000 [ 25.099362] RBP: ffff8801c62b7970 R08: 0000000000033c20 R09: 0000000000000001 [ 25.106726] R10: ffff8801b8b5c800 R11: 0000000000000001 R12: ffff8801c62b7c08 [ 25.113977] R13: ffffeafff9078020 R14: ffffeafff9078000 R15: 0000000000000001 [ 25.121227] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.129436] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.135352] CR2: ffffeafff9078020 CR3: 00000001c838d000 CR4: 00000000001606f0 [ 25.142604] Stack: [ 25.144731] ffffeafff9078020 ffff8801c62b7c08 ffff8801bfbd2808 ffffeafff9078000 [ 25.152880] ffff8801b9653ec8 ffff8801c62b79c8 ffffffff8154bfcf ffff8801c62b7c18 [ 25.160917] ffff8801c62b7c10 ffff8801c62b7c88 00003ffe41e001a0 00000001bfbd2000 [ 25.168963] Call Trace: [ 25.171538] [] zap_huge_pmd+0x16f/0x860 [ 25.177141] [] unmap_page_range+0x12ad/0x1730 [ 25.183268] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.189573] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 25.196487] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.203370] [] unmap_single_vma+0x101/0x260 [ 25.209385] [] unmap_vmas+0x102/0x1d0 [ 25.214897] [] exit_mmap+0x214/0x3f0 [ 25.220246] [] ? SyS_munmap+0xa0/0xa0 [ 25.225678] [] ? up_write+0x1a/0x60 [ 25.230941] [] mmput+0xf3/0x2d0 [ 25.235853] [] do_exit+0x906/0x27b0 [ 25.241110] [] ? release_task.part.19+0x1210/0x1210 [ 25.247896] [] ? up_write+0x1a/0x60 [ 25.253153] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.259283] [] ? mprotect_fixup+0x930/0x930 [ 25.265235] [] do_group_exit+0x111/0x340 [ 25.270928] [] ? do_group_exit+0x340/0x340 [ 25.276811] [] SyS_exit_group+0x1d/0x20 [ 25.282426] [] do_syscall_64+0x1a6/0x490 [ 25.288120] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.295174] 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 [ 25.322579] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.328960] RSP [ 25.332563] CR2: ffffeafff9078020 [ 25.336051] ---[ end trace 226f59cabb682a7a ]--- [ 25.340839] Kernel panic - not syncing: Fatal exception [ 25.346537] Dumping ftrace buffer: [ 25.350058] (ftrace buffer empty) [ 25.353748] Kernel Offset: disabled [ 25.357369] Rebooting in 86400 seconds..