[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.437945] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.688018] random: sshd: uninitialized urandom read (32 bytes read) [ 16.152516] random: sshd: uninitialized urandom read (32 bytes read) [ 16.720394] random: sshd: uninitialized urandom read (32 bytes read) [ 16.858501] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.58' (ECDSA) to the list of known hosts. [ 22.946667] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.032052] BUG: unable to handle kernel paging request at ffffeafff9180020 [ 23.040100] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.046469] PGD 0 [ 23.048539] [ 23.050390] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.055115] Dumping ftrace buffer: [ 23.058783] (ftrace buffer empty) [ 23.062973] Modules linked in: [ 23.066629] CPU: 1 PID: 3797 Comm: syz-executor901 Not tainted 4.9.122-g54068d6 #26 [ 23.074787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.084896] task: ffff8801b8631800 task.stack: ffff8801b80e8000 [ 23.091495] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.100355] RSP: 0018:ffff8801b80ef948 EFLAGS: 00010246 [ 23.105977] RAX: dffffc0000000000 RBX: ffffeafff9180000 RCX: 0000000000000000 [ 23.113262] RDX: 1ffffd5fff230004 RSI: ffffffff814f5918 RDI: ffffeafff9180000 [ 23.120532] RBP: ffff8801b80ef970 R08: 00000000000334a0 R09: 0000000000000001 [ 23.127972] R10: ffff8801b8631800 R11: 0000000000000001 R12: ffff8801b80efc08 [ 23.135482] R13: ffffeafff9180020 R14: ffffeafff9180000 R15: 0000000000000001 [ 23.142779] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 23.150997] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.156874] CR2: ffffeafff9180020 CR3: 00000001b9101000 CR4: 00000000001606f0 [ 23.164142] Stack: [ 23.166488] ffffeafff9180020 ffff8801b80efc08 ffff8801b929a800 ffffeafff9180000 [ 23.174708] ffff8801b79af2c0 ffff8801b80ef9c8 ffffffff8154cb8f ffff8801b80efc18 [ 23.182936] ffff8801b80efc10 ffff8801b80efc88 00003ffe460001e0 00000001b929a000 [ 23.191359] Call Trace: [ 23.193947] [] zap_huge_pmd+0x16f/0x860 [ 23.199571] [] unmap_page_range+0x12ad/0x1730 [ 23.205895] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.212298] [] unmap_single_vma+0x101/0x260 [ 23.218268] [] unmap_vmas+0x102/0x1d0 [ 23.223751] [] exit_mmap+0x214/0x3f0 [ 23.229121] [] ? SyS_munmap+0xa0/0xa0 [ 23.234671] [] ? up_write+0x1a/0x60 [ 23.240220] [] mmput+0xf3/0x2d0 [ 23.245279] [] do_exit+0x906/0x27b0 [ 23.250820] [] ? release_task.part.19+0x1210/0x1210 [ 23.257494] [] ? up_write+0x1a/0x60 [ 23.263046] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.269365] [] ? mprotect_fixup+0x930/0x930 [ 23.275335] [] do_group_exit+0x111/0x340 [ 23.281047] [] ? do_group_exit+0x340/0x340 [ 23.287037] [] SyS_exit_group+0x1d/0x20 [ 23.292668] [] do_syscall_64+0x1a6/0x490 [ 23.298377] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.305399] 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 [ 23.333660] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.340655] RSP [ 23.344276] CR2: ffffeafff9180020 [ 23.347753] ---[ end trace d2f3be869232f6af ]--- [ 23.352520] Kernel panic - not syncing: Fatal exception [ 23.358709] Dumping ftrace buffer: [ 23.362297] (ftrace buffer empty) [ 23.365999] Kernel Offset: disabled [ 23.369622] Rebooting in 86400 seconds..