[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.027162] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.269222] random: sshd: uninitialized urandom read (32 bytes read) [ 25.511562] random: sshd: uninitialized urandom read (32 bytes read) [ 25.963128] random: sshd: uninitialized urandom read (32 bytes read) [ 42.124995] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 47.627490] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.747768] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 47.755225] IP: [] page_remove_rmap+0x37/0x6d0 [ 47.761466] PGD 0 [ 47.763414] [ 47.765039] Oops: 0000 [#1] PREEMPT SMP KASAN [ 47.769508] Dumping ftrace buffer: [ 47.773021] (ftrace buffer empty) [ 47.776708] Modules linked in: [ 47.779990] CPU: 0 PID: 3801 Comm: syz-executor293 Not tainted 4.9.122-g54068d6 #78 [ 47.787753] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.797081] task: ffff8801b97a4800 task.stack: ffff8801ba028000 [ 47.803106] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 47.811777] RSP: 0018:ffff8801ba02f948 EFLAGS: 00010246 [ 47.817195] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 47.824435] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 47.831674] RBP: ffff8801ba02f970 R08: 0000000000034b00 R09: 0000000000000001 [ 47.838917] R10: ffff8801b97a4800 R11: 0000000000000001 R12: ffff8801ba02fc08 [ 47.846159] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 47.853405] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.861606] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.867460] CR2: ffffeafff90e8020 CR3: 00000001c03b6000 CR4: 00000000001606f0 [ 47.874828] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.882242] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.889481] Stack: [ 47.891705] ffffeafff90e8020 ffff8801ba02fc08 ffff8801ca920800 ffffeafff90e8000 [ 47.899695] ffff8801c537e0b0 ffff8801ba02f9c8 ffffffff8154cb8f ffff8801ba02fc18 [ 47.907677] ffff8801ba02fc10 ffff8801ba02fc88 00003ffe43a001e0 00000001ca920000 [ 47.915651] Call Trace: [ 47.918216] [] zap_huge_pmd+0x16f/0x860 [ 47.923813] [] unmap_page_range+0x12ad/0x1730 [ 47.929931] [] ? vm_normal_page_pmd+0x310/0x310 [ 47.936221] [] unmap_single_vma+0x101/0x260 [ 47.942218] [] unmap_vmas+0x102/0x1d0 [ 47.947657] [] exit_mmap+0x214/0x3f0 [ 47.952997] [] ? SyS_munmap+0xa0/0xa0 [ 47.958423] [] ? up_write+0x1a/0x60 [ 47.963872] [] mmput+0xf3/0x2d0 [ 47.968781] [] do_exit+0x906/0x27b0 [ 47.974032] [] ? release_task.part.19+0x1210/0x1210 [ 47.980673] [] ? up_write+0x1a/0x60 [ 47.985994] [] ? do_mprotect_pkey+0x71d/0x890 [ 47.992118] [] ? mprotect_fixup+0x930/0x930 [ 47.998062] [] do_group_exit+0x111/0x340 [ 48.003744] [] ? do_group_exit+0x340/0x340 [ 48.009648] [] SyS_exit_group+0x1d/0x20 [ 48.015256] [] do_syscall_64+0x1a6/0x490 [ 48.020959] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 48.027905] 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 [ 48.054629] RIP [] page_remove_rmap+0x37/0x6d0 [ 48.060958] RSP [ 48.064551] CR2: ffffeafff90e8020 [ 48.067980] ---[ end trace 144e3bac5d5062f5 ]--- [ 48.072707] Kernel panic - not syncing: Fatal exception [ 48.078388] Dumping ftrace buffer: [ 48.081912] (ftrace buffer empty) [ 48.085594] Kernel Offset: disabled [ 48.089193] Rebooting in 86400 seconds..