[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.694308] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.950250] random: sshd: uninitialized urandom read (32 bytes read) [ 14.442656] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.979426] random: sshd: uninitialized urandom read (32 bytes read) [ 15.114638] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 20.626759] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.719451] BUG: unable to handle kernel paging request at ffffeafff91b0020 [ 20.726841] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.733117] PGD 0 [ 20.735071] [ 20.736706] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.741198] Dumping ftrace buffer: [ 20.744734] (ftrace buffer empty) [ 20.748471] Modules linked in: [ 20.751781] CPU: 0 PID: 3794 Comm: syz-executor127 Not tainted 4.9.121-g681e57b #25 [ 20.759561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.768908] task: ffff8801b765e000 task.stack: ffff8801b9ee0000 [ 20.774990] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.784129] RSP: 0018:ffff8801b9ee7948 EFLAGS: 00010246 [ 20.789570] RAX: dffffc0000000000 RBX: ffffeafff91b0000 RCX: 0000000000000000 [ 20.796832] RDX: 1ffffd5fff236004 RSI: ffffffff814f5278 RDI: ffffeafff91b0000 [ 20.804094] RBP: ffff8801b9ee7970 R08: 0000000000033b80 R09: 0000000000000001 [ 20.811356] R10: ffff8801b765e000 R11: 0000000000000001 R12: ffff8801b9ee7c08 [ 20.818623] R13: ffffeafff91b0020 R14: ffffeafff91b0000 R15: 0000000000000001 [ 20.825890] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.834106] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.839980] CR2: ffffeafff91b0020 CR3: 00000001b86ca000 CR4: 00000000001606f0 [ 20.847239] Stack: [ 20.849377] ffffeafff91b0020 ffff8801b9ee7c08 ffff8801bad90800 ffffeafff91b0000 [ 20.857381] ffff8801b7c9f5d8 ffff8801b9ee79c8 ffffffff8154c20f ffff8801b9ee7c18 [ 20.865412] ffff8801b9ee7c10 ffff8801b9ee7c88 00003ffe46c001e0 00000001bad90000 [ 20.873413] Call Trace: [ 20.875987] [] zap_huge_pmd+0x16f/0x860 [ 20.881606] [] unmap_page_range+0x12ad/0x1730 [ 20.887748] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 20.894061] [] unmap_single_vma+0x101/0x260 [ 20.900045] [] unmap_vmas+0x102/0x1d0 [ 20.905489] [] exit_mmap+0x214/0x3f0 [ 20.910840] [] ? SyS_munmap+0xa0/0xa0 [ 20.916284] [] ? up_write+0x1a/0x60 [ 20.921549] [] mmput+0xf3/0x2d0 [ 20.926470] [] do_exit+0x906/0x27b0 [ 20.931747] [] ? release_task.part.19+0x1210/0x1210 [ 20.938403] [] ? up_write+0x1a/0x60 [ 20.943690] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.949845] [] ? mprotect_fixup+0x930/0x930 [ 20.955818] [] do_group_exit+0x111/0x340 [ 20.961526] [] ? do_group_exit+0x340/0x340 [ 20.967408] [] SyS_exit_group+0x1d/0x20 [ 20.973021] [] do_syscall_64+0x1a6/0x490 [ 20.978731] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.985638] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 21.012660] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.019007] RSP [ 21.022610] CR2: ffffeafff91b0020 [ 21.026048] ---[ end trace 93b34e2d72de62d7 ]--- [ 21.030782] Kernel panic - not syncing: Fatal exception [ 21.036459] Dumping ftrace buffer: [ 21.039994] (ftrace buffer empty) [ 21.043706] Kernel Offset: disabled [ 21.047322] Rebooting in 86400 seconds..