[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.624033] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.794757] random: sshd: uninitialized urandom read (32 bytes read) [ 19.216086] random: sshd: uninitialized urandom read (32 bytes read) [ 19.760806] random: sshd: uninitialized urandom read (32 bytes read) [ 23.667901] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 29.129272] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.206343] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 29.213684] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.219941] PGD 0 [ 29.221891] [ 29.223517] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.227985] Dumping ftrace buffer: [ 29.231500] (ftrace buffer empty) [ 29.235184] Modules linked in: [ 29.238469] CPU: 1 PID: 3797 Comm: syz-executor751 Not tainted 4.9.120-gf85543b #24 [ 29.246235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.255565] task: ffff8801b8846000 task.stack: ffff8801da3b8000 [ 29.261594] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.270277] RSP: 0018:ffff8801da3bf948 EFLAGS: 00010246 [ 29.275705] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: 0000000000000000 [ 29.282949] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5128 RDI: ffffeafff9158000 [ 29.290193] RBP: ffff8801da3bf970 R08: 00000000000340c0 R09: 0000000000000001 [ 29.297440] R10: ffff8801b8846000 R11: 0000000000000001 R12: ffff8801da3bfc08 [ 29.304687] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 29.311943] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.320144] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.325999] CR2: ffffeafff9158020 CR3: 00000001d95a9000 CR4: 00000000001606f0 [ 29.333244] Stack: [ 29.335368] ffffeafff9158020 ffff8801da3bfc08 ffff8801b9f77800 ffffeafff9158000 [ 29.343428] ffff8801b7fd03c8 ffff8801da3bf9c8 ffffffff8154bfcf ffff8801da3bfc18 [ 29.351426] ffff8801da3bfc10 ffff8801da3bfc88 00003ffe456001e0 00000001b9f77000 [ 29.359414] Call Trace: [ 29.361983] [] zap_huge_pmd+0x16f/0x860 [ 29.367587] [] unmap_page_range+0x12ad/0x1730 [ 29.373711] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.380007] [] unmap_single_vma+0x101/0x260 [ 29.385960] [] unmap_vmas+0x102/0x1d0 [ 29.391385] [] exit_mmap+0x214/0x3f0 [ 29.396723] [] ? SyS_munmap+0xa0/0xa0 [ 29.402149] [] ? up_write+0x1a/0x60 [ 29.407402] [] mmput+0xf3/0x2d0 [ 29.412305] [] do_exit+0x906/0x27b0 [ 29.417561] [] ? release_task.part.19+0x1210/0x1210 [ 29.424227] [] ? up_write+0x1a/0x60 [ 29.429504] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.435627] [] ? mprotect_fixup+0x930/0x930 [ 29.441574] [] do_group_exit+0x111/0x340 [ 29.447259] [] ? do_group_exit+0x340/0x340 [ 29.453116] [] SyS_exit_group+0x1d/0x20 [ 29.458718] [] do_syscall_64+0x1a6/0x490 [ 29.464404] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.471299] 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 [ 29.498411] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.504740] RSP [ 29.508337] CR2: ffffeafff9158020 [ 29.511774] ---[ end trace 35faa46651d3ffae ]--- [ 29.516500] Kernel panic - not syncing: Fatal exception [ 29.522144] Dumping ftrace buffer: [ 29.525668] (ftrace buffer empty) [ 29.529357] Kernel Offset: disabled [ 29.532961] Rebooting in 86400 seconds..