[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.172739] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.900029] random: sshd: uninitialized urandom read (32 bytes read) [ 19.183506] random: sshd: uninitialized urandom read (32 bytes read) [ 19.672734] random: sshd: uninitialized urandom read (32 bytes read) [ 34.315019] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 39.873712] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.964161] BUG: unable to handle kernel paging request at ffffeafff8df0020 [ 39.971522] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.977770] PGD 0 [ 39.979722] [ 39.981361] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.985859] Dumping ftrace buffer: [ 39.989370] (ftrace buffer empty) [ 39.993052] Modules linked in: [ 39.996347] CPU: 0 PID: 3816 Comm: syz-executor230 Not tainted 4.9.122-g54068d6 #78 [ 40.004109] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.013436] task: ffff8801b76fe000 task.stack: ffff8801b5d28000 [ 40.019463] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 40.028142] RSP: 0018:ffff8801b5d2f948 EFLAGS: 00010246 [ 40.033604] RAX: dffffc0000000000 RBX: ffffeafff8df0000 RCX: 0000000000000000 [ 40.040854] RDX: 1ffffd5fff1be004 RSI: ffffffff814f5918 RDI: ffffeafff8df0000 [ 40.048099] RBP: ffff8801b5d2f970 R08: 0000000000034500 R09: 0000000000000001 [ 40.055361] R10: ffff8801b76fe000 R11: 0000000000000001 R12: ffff8801b5d2fc08 [ 40.062601] R13: ffffeafff8df0020 R14: ffffeafff8df0000 R15: 0000000000000001 [ 40.069962] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.078164] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.084016] CR2: ffffeafff8df0020 CR3: 00000001b7cd3000 CR4: 00000000001606f0 [ 40.091277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.098530] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.105771] Stack: [ 40.107904] ffffeafff8df0020 ffff8801b5d2fc08 ffff8801c7ca6800 ffffeafff8df0000 [ 40.115990] ffff8801b5e35478 ffff8801b5d2f9c8 ffffffff8154cb8f ffff8801b5d2fc18 [ 40.123972] ffff8801b5d2fc10 ffff8801b5d2fc88 00003ffe37c001e0 00000001c7ca6000 [ 40.131967] Call Trace: [ 40.134534] [] zap_huge_pmd+0x16f/0x860 [ 40.140135] [] unmap_page_range+0x12ad/0x1730 [ 40.146252] [] ? vm_normal_page_pmd+0x310/0x310 [ 40.152543] [] unmap_single_vma+0x101/0x260 [ 40.158489] [] unmap_vmas+0x102/0x1d0 [ 40.163910] [] exit_mmap+0x214/0x3f0 [ 40.169250] [] ? SyS_munmap+0xa0/0xa0 [ 40.174675] [] ? up_write+0x1a/0x60 [ 40.179927] [] mmput+0xf3/0x2d0 [ 40.184832] [] do_exit+0x906/0x27b0 [ 40.190088] [] ? release_task.part.19+0x1210/0x1210 [ 40.196731] [] ? up_write+0x1a/0x60 [ 40.201981] [] ? do_mprotect_pkey+0x71d/0x890 [ 40.208103] [] ? mprotect_fixup+0x930/0x930 [ 40.214049] [] do_group_exit+0x111/0x340 [ 40.219737] [] ? do_group_exit+0x340/0x340 [ 40.225595] [] SyS_exit_group+0x1d/0x20 [ 40.231194] [] do_syscall_64+0x1a6/0x490 [ 40.236880] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.243885] 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 [ 40.270752] RIP [] page_remove_rmap+0x37/0x6d0 [ 40.277077] RSP [ 40.280676] CR2: ffffeafff8df0020 [ 40.284103] ---[ end trace 8b3bfbdda718e08e ]--- [ 40.288859] Kernel panic - not syncing: Fatal exception [ 40.294585] Dumping ftrace buffer: [ 40.298103] (ftrace buffer empty) [ 40.301784] Kernel Offset: disabled [ 40.305385] Rebooting in 86400 seconds..