[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.990428] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.165937] random: sshd: uninitialized urandom read (32 bytes read) [ 26.607771] random: sshd: uninitialized urandom read (32 bytes read) [ 27.091253] random: sshd: uninitialized urandom read (32 bytes read) [ 27.224391] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.61' (ECDSA) to the list of known hosts. [ 32.848633] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.941367] BUG: unable to handle kernel paging request at ffffeafff8dc0020 [ 32.948707] IP: [] page_remove_rmap+0x37/0x6d0 [ 32.954952] PGD 0 [ 32.956897] [ 32.958517] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.962985] Dumping ftrace buffer: [ 32.966497] (ftrace buffer empty) [ 32.970227] Modules linked in: [ 32.973520] CPU: 1 PID: 3797 Comm: syz-executor767 Not tainted 4.9.122-g54068d6 #26 [ 32.981283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.990611] task: ffff8801b81f6000 task.stack: ffff8801b81b0000 [ 32.996641] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.005354] RSP: 0018:ffff8801b81b7948 EFLAGS: 00010246 [ 33.010774] RAX: dffffc0000000000 RBX: ffffeafff8dc0000 RCX: 0000000000000000 [ 33.018016] RDX: 1ffffd5fff1b8004 RSI: ffffffff814f5918 RDI: ffffeafff8dc0000 [ 33.025263] RBP: ffff8801b81b7970 R08: 0000000000033620 R09: 0000000000000001 [ 33.032511] R10: ffff8801b81f6000 R11: 0000000000000001 R12: ffff8801b81b7c08 [ 33.039757] R13: ffffeafff8dc0020 R14: ffffeafff8dc0000 R15: 0000000000000001 [ 33.047007] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.055211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.061065] CR2: ffffeafff8dc0020 CR3: 00000001c93a5000 CR4: 00000000001606f0 [ 33.068314] Stack: [ 33.070438] ffffeafff8dc0020 ffff8801b81b7c08 ffff8801bcc65800 ffffeafff8dc0000 [ 33.078452] ffff8801b693abb0 ffff8801b81b79c8 ffffffff8154cb8f ffff8801b81b7c18 [ 33.086430] ffff8801b81b7c10 ffff8801b81b7c88 00003ffe370001e0 00000001bcc65000 [ 33.094417] Call Trace: [ 33.096984] [] zap_huge_pmd+0x16f/0x860 [ 33.102585] [] unmap_page_range+0x12ad/0x1730 [ 33.108703] [] ? vm_normal_page_pmd+0x310/0x310 [ 33.114998] [] unmap_single_vma+0x101/0x260 [ 33.120946] [] unmap_vmas+0x102/0x1d0 [ 33.126376] [] exit_mmap+0x214/0x3f0 [ 33.131718] [] ? SyS_munmap+0xa0/0xa0 [ 33.137153] [] ? up_write+0x1a/0x60 [ 33.142410] [] mmput+0xf3/0x2d0 [ 33.147314] [] do_exit+0x906/0x27b0 [ 33.152573] [] ? release_task.part.19+0x1210/0x1210 [ 33.159213] [] ? up_write+0x1a/0x60 [ 33.164466] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.170582] [] ? mprotect_fixup+0x930/0x930 [ 33.176526] [] do_group_exit+0x111/0x340 [ 33.182210] [] ? do_group_exit+0x340/0x340 [ 33.188070] [] SyS_exit_group+0x1d/0x20 [ 33.193671] [] do_syscall_64+0x1a6/0x490 [ 33.199368] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.206287] 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 [ 33.206402] RIP [ 33.206411] [] page_remove_rmap+0x37/0x6d0 RSP [ 33.206416] CR2: ffffeafff8dc0020 [ 33.206425] ---[ end trace 2962373aeaf56d5d ]--- [ 33.206429] Kernel panic - not syncing: Fatal exception [ 33.212206] Dumping ftrace buffer: [ 33.212209] (ftrace buffer empty) [ 33.212212] Kernel Offset: disabled [ 33.260072] Rebooting in 86400 seconds..