[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.033777] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.946127] random: sshd: uninitialized urandom read (32 bytes read) [ 24.458364] random: sshd: uninitialized urandom read (32 bytes read) [ 25.000455] random: sshd: uninitialized urandom read (32 bytes read) [ 25.136370] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. [ 30.782225] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.859963] BUG: unable to handle kernel paging request at ffffeafff8f68020 [ 30.867424] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.873688] PGD 0 [ 30.875633] [ 30.877255] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.881729] Dumping ftrace buffer: [ 30.885245] (ftrace buffer empty) [ 30.888931] Modules linked in: [ 30.892229] CPU: 0 PID: 3754 Comm: syz-executor577 Not tainted 4.9.122-g54068d6 #26 [ 30.899993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.909324] task: ffff8801be34b000 task.stack: ffff8801bc7e0000 [ 30.915358] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.924036] RSP: 0018:ffff8801bc7e7948 EFLAGS: 00010246 [ 30.929516] RAX: dffffc0000000000 RBX: ffffeafff8f68000 RCX: 0000000000000000 [ 30.936881] RDX: 1ffffd5fff1ed004 RSI: ffffffff814f5918 RDI: ffffeafff8f68000 [ 30.944139] RBP: ffff8801bc7e7970 R08: 0000000000034320 R09: 0000000000000001 [ 30.951396] R10: ffff8801be34b000 R11: 0000000000000001 R12: ffff8801bc7e7c08 [ 30.958643] R13: ffffeafff8f68020 R14: ffffeafff8f68000 R15: 0000000000000001 [ 30.965887] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.974102] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.979957] CR2: ffffeafff8f68020 CR3: 00000001c4015000 CR4: 00000000001606f0 [ 30.987203] Stack: [ 30.989333] ffffeafff8f68020 ffff8801bc7e7c08 ffff8801c5156800 ffffeafff8f68000 [ 30.997351] ffff8801bdc82000 ffff8801bc7e79c8 ffffffff8154cb8f ffff8801bc7e7c18 [ 31.005408] ffff8801bc7e7c10 ffff8801bc7e7c88 00003ffe3da001e0 00000001c5156000 [ 31.013517] Call Trace: [ 31.016953] [] zap_huge_pmd+0x16f/0x860 [ 31.022559] [] unmap_page_range+0x12ad/0x1730 [ 31.028790] [] ? vm_normal_page_pmd+0x310/0x310 [ 31.035099] [] unmap_single_vma+0x101/0x260 [ 31.041055] [] unmap_vmas+0x102/0x1d0 [ 31.046488] [] exit_mmap+0x214/0x3f0 [ 31.051835] [] ? SyS_munmap+0xa0/0xa0 [ 31.057274] [] ? up_write+0x1a/0x60 [ 31.062531] [] mmput+0xf3/0x2d0 [ 31.067435] [] do_exit+0x906/0x27b0 [ 31.072686] [] ? release_task.part.19+0x1210/0x1210 [ 31.079456] [] ? up_write+0x1a/0x60 [ 31.084714] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.090942] [] ? mprotect_fixup+0x930/0x930 [ 31.096891] [] do_group_exit+0x111/0x340 [ 31.102646] [] ? do_group_exit+0x340/0x340 [ 31.108552] [] SyS_exit_group+0x1d/0x20 [ 31.114161] [] do_syscall_64+0x1a6/0x490 [ 31.119906] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.126810] 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 [ 31.153923] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.160254] RSP [ 31.163852] CR2: ffffeafff8f68020 [ 31.167284] ---[ end trace f29e494a8903d311 ]--- [ 31.172013] Kernel panic - not syncing: Fatal exception [ 31.177649] Dumping ftrace buffer: [ 31.181173] (ftrace buffer empty) [ 31.184859] Kernel Offset: disabled [ 31.188471] Rebooting in 86400 seconds..