[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.698026] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.144877] random: sshd: uninitialized urandom read (32 bytes read) [ 29.573577] random: sshd: uninitialized urandom read (32 bytes read) [ 29.988614] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. [ 35.697189] urandom_read: 1 callbacks suppressed [ 35.697193] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.789259] BUG: unable to handle kernel paging request at ffffeafff90b0020 [ 35.796735] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.803088] PGD 0 [ 35.805033] [ 35.806798] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.811290] Dumping ftrace buffer: [ 35.814911] (ftrace buffer empty) [ 35.818654] Modules linked in: [ 35.821945] CPU: 1 PID: 3807 Comm: syz-executor337 Not tainted 4.9.122-g54068d6 #26 [ 35.829713] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.839130] task: ffff8801c0d16000 task.stack: ffff8801b6120000 [ 35.845177] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.853988] RSP: 0018:ffff8801b6127948 EFLAGS: 00010246 [ 35.859482] RAX: dffffc0000000000 RBX: ffffeafff90b0000 RCX: 0000000000000000 [ 35.866841] RDX: 1ffffd5fff216004 RSI: ffffffff814f5918 RDI: ffffeafff90b0000 [ 35.874083] RBP: ffff8801b6127970 R08: 0000000000033b40 R09: 0000000000000001 [ 35.881330] R10: ffff8801c0d16000 R11: 0000000000000001 R12: ffff8801b6127c08 [ 35.888626] R13: ffffeafff90b0020 R14: ffffeafff90b0000 R15: 0000000000000001 [ 35.895973] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.904308] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.910337] CR2: ffffeafff90b0020 CR3: 00000001cb088000 CR4: 00000000001606f0 [ 35.917602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.924847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.932100] Stack: [ 35.934226] ffffeafff90b0020 ffff8801b6127c08 ffff8801c904c800 ffffeafff90b0000 [ 35.942217] ffff8801b7df66e0 ffff8801b61279c8 ffffffff8154cb8f ffff8801b6127c18 [ 35.950204] ffff8801b6127c10 ffff8801b6127c88 00003ffe42c001e0 00000001c904c000 [ 35.958286] Call Trace: [ 35.960856] [] zap_huge_pmd+0x16f/0x860 [ 35.966470] [] unmap_page_range+0x12ad/0x1730 [ 35.972595] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.978890] [] unmap_single_vma+0x101/0x260 [ 35.984833] [] unmap_vmas+0x102/0x1d0 [ 35.990259] [] exit_mmap+0x214/0x3f0 [ 35.995593] [] ? SyS_munmap+0xa0/0xa0 [ 36.001016] [] ? up_write+0x1a/0x60 [ 36.006267] [] mmput+0xf3/0x2d0 [ 36.011170] [] do_exit+0x906/0x27b0 [ 36.016438] [] ? release_task.part.19+0x1210/0x1210 [ 36.023082] [] ? up_write+0x1a/0x60 [ 36.028386] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.034512] [] ? mprotect_fixup+0x930/0x930 [ 36.040461] [] do_group_exit+0x111/0x340 [ 36.046145] [] ? do_group_exit+0x340/0x340 [ 36.052003] [] SyS_exit_group+0x1d/0x20 [ 36.057603] [] do_syscall_64+0x1a6/0x490 [ 36.063298] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.070198] 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 [ 36.097036] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.103456] RSP [ 36.107141] CR2: ffffeafff90b0020 [ 36.110568] ---[ end trace 0b6c3a7d03beb2b3 ]--- [ 36.115294] Kernel panic - not syncing: Fatal exception [ 36.121081] Dumping ftrace buffer: [ 36.124609] (ftrace buffer empty) [ 36.128294] Kernel Offset: disabled [ 36.131896] Rebooting in 86400 seconds..