[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.361122] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.592181] random: sshd: uninitialized urandom read (32 bytes read) [ 18.869223] random: sshd: uninitialized urandom read (32 bytes read) [ 19.408310] random: sshd: uninitialized urandom read (32 bytes read) [ 31.052556] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts. [ 36.603925] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.728891] BUG: unable to handle kernel paging request at ffffeafff8ff8020 [ 36.736287] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.742565] PGD 0 [ 36.744545] [ 36.746185] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.750665] Dumping ftrace buffer: [ 36.754191] (ftrace buffer empty) [ 36.757888] Modules linked in: [ 36.761313] CPU: 1 PID: 3674 Comm: syz-executor822 Not tainted 4.9.122-g54068d6 #78 [ 36.769094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.778434] task: ffff8801c3cce000 task.stack: ffff8801c48f0000 [ 36.784477] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.793201] RSP: 0018:ffff8801c48f7948 EFLAGS: 00010246 [ 36.798788] RAX: dffffc0000000000 RBX: ffffeafff8ff8000 RCX: 0000000000000000 [ 36.806047] RDX: 1ffffd5fff1ff004 RSI: ffffffff814f5918 RDI: ffffeafff8ff8000 [ 36.813432] RBP: ffff8801c48f7970 R08: 0000000000034140 R09: 0000000000000001 [ 36.820821] R10: ffff8801c3cce000 R11: 0000000000000001 R12: ffff8801c48f7c08 [ 36.828081] R13: ffffeafff8ff8020 R14: ffffeafff8ff8000 R15: 0000000000000001 [ 36.835339] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.843554] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.849426] CR2: ffffeafff8ff8020 CR3: 00000001c83fd000 CR4: 00000000001606f0 [ 36.856849] Stack: [ 36.859082] ffffeafff8ff8020 ffff8801c48f7c08 ffff8801c63f4800 ffffeafff8ff8000 [ 36.867147] ffff8801c76915d8 ffff8801c48f79c8 ffffffff8154cb8f ffff8801c48f7c18 [ 36.875362] ffff8801c48f7c10 ffff8801c48f7c88 00003ffe3fe001e0 00000001c63f4000 [ 36.883448] Call Trace: [ 36.886027] [] zap_huge_pmd+0x16f/0x860 [ 36.891643] [] unmap_page_range+0x12ad/0x1730 [ 36.897776] [] ? vm_normal_page_pmd+0x310/0x310 [ 36.904092] [] unmap_single_vma+0x101/0x260 [ 36.910052] [] unmap_vmas+0x102/0x1d0 [ 36.915487] [] exit_mmap+0x214/0x3f0 [ 36.920974] [] ? SyS_munmap+0xa0/0xa0 [ 36.926419] [] ? up_write+0x1a/0x60 [ 36.931685] [] mmput+0xf3/0x2d0 [ 36.936603] [] do_exit+0x906/0x27b0 [ 36.942016] [] ? release_task.part.19+0x1210/0x1210 [ 36.948774] [] ? up_write+0x1a/0x60 [ 36.954047] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.960180] [] ? mprotect_fixup+0x930/0x930 [ 36.966138] [] do_group_exit+0x111/0x340 [ 36.971836] [] ? do_group_exit+0x340/0x340 [ 36.977711] [] SyS_exit_group+0x1d/0x20 [ 36.983429] [] do_syscall_64+0x1a6/0x490 [ 36.989242] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.996432] 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 [ 37.024841] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.031196] RSP [ 37.034895] CR2: ffffeafff8ff8020 [ 37.038338] ---[ end trace 11052254f4d61566 ]--- [ 37.044036] Kernel panic - not syncing: Fatal exception [ 37.049905] Dumping ftrace buffer: [ 37.053439] (ftrace buffer empty) [ 37.057139] Kernel Offset: disabled [ 37.060755] Rebooting in 86400 seconds..