[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.681904] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.798923] random: sshd: uninitialized urandom read (32 bytes read) [ 14.422176] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.960761] random: sshd: uninitialized urandom read (32 bytes read) [ 15.102055] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 20.597812] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.674781] BUG: unable to handle kernel paging request at ffffeafff8f60020 [ 20.682126] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.688372] PGD 0 [ 20.690320] [ 20.691956] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.696434] Dumping ftrace buffer: [ 20.699945] (ftrace buffer empty) [ 20.703631] Modules linked in: [ 20.706922] CPU: 0 PID: 3785 Comm: syz-executor340 Not tainted 4.9.122-g54068d6 #26 [ 20.714687] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.724016] task: ffff8801b8318000 task.stack: ffff8801b7c10000 [ 20.730047] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.738724] RSP: 0018:ffff8801b7c17948 EFLAGS: 00010246 [ 20.744148] RAX: dffffc0000000000 RBX: ffffeafff8f60000 RCX: 0000000000000000 [ 20.751392] RDX: 1ffffd5fff1ec004 RSI: ffffffff814f5918 RDI: ffffeafff8f60000 [ 20.758638] RBP: ffff8801b7c17970 R08: 0000000000034120 R09: 0000000000000001 [ 20.765885] R10: ffff8801b8318000 R11: 0000000000000001 R12: ffff8801b7c17c08 [ 20.773130] R13: ffffeafff8f60020 R14: ffffeafff8f60000 R15: 0000000000000001 [ 20.780375] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.788577] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.794435] CR2: ffffeafff8f60020 CR3: 00000001b8a40000 CR4: 00000000001606f0 [ 20.801684] Stack: [ 20.803808] ffffeafff8f60020 ffff8801b7c17c08 ffff8801c50ea800 ffffeafff8f60000 [ 20.811802] ffff8801b6fd3bb0 ffff8801b7c179c8 ffffffff8154cb8f ffff8801b7c17c18 [ 20.819798] ffff8801b7c17c10 ffff8801b7c17c88 00003ffe3d8001e0 00000001c50ea000 [ 20.827793] Call Trace: [ 20.830361] [] zap_huge_pmd+0x16f/0x860 [ 20.835963] [] unmap_page_range+0x12ad/0x1730 [ 20.842087] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.848380] [] unmap_single_vma+0x101/0x260 [ 20.854327] [] unmap_vmas+0x102/0x1d0 [ 20.859755] [] exit_mmap+0x214/0x3f0 [ 20.865111] [] ? SyS_munmap+0xa0/0xa0 [ 20.870549] [] ? up_write+0x1a/0x60 [ 20.875802] [] mmput+0xf3/0x2d0 [ 20.880715] [] do_exit+0x906/0x27b0 [ 20.885971] [] ? release_task.part.19+0x1210/0x1210 [ 20.892610] [] ? up_write+0x1a/0x60 [ 20.897862] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.903984] [] ? mprotect_fixup+0x930/0x930 [ 20.909931] [] do_group_exit+0x111/0x340 [ 20.915621] [] ? do_group_exit+0x340/0x340 [ 20.921481] [] SyS_exit_group+0x1d/0x20 [ 20.927085] [] do_syscall_64+0x1a6/0x490 [ 20.932772] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.939669] 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 [ 20.966697] RIP [] page_remove_rmap+0x37/0x6d0 [ 20.973025] RSP [ 20.976625] CR2: ffffeafff8f60020 [ 20.980057] ---[ end trace 21797be9e7c94fc3 ]--- [ 20.984785] Kernel panic - not syncing: Fatal exception [ 20.990481] Dumping ftrace buffer: [ 20.994002] (ftrace buffer empty) [ 20.997691] Kernel Offset: disabled [ 21.001291] Rebooting in 86400 seconds..