[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.749047] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 17.504378] random: sshd: uninitialized urandom read (32 bytes read) [ 17.783021] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.270589] random: sshd: uninitialized urandom read (32 bytes read) [ 18.410549] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 23.930922] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.026143] BUG: unable to handle kernel paging request at ffffeafff92e0020 [ 24.033763] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.040033] PGD 0 [ 24.041996] [ 24.043672] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.048151] Dumping ftrace buffer: [ 24.051674] (ftrace buffer empty) [ 24.055370] Modules linked in: [ 24.058678] CPU: 0 PID: 3795 Comm: syz-executor244 Not tainted 4.9.120-gf85543b #24 [ 24.066509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.075874] task: ffff8801b6800000 task.stack: ffff8801b5fc8000 [ 24.081985] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.090689] RSP: 0018:ffff8801b5fcf948 EFLAGS: 00010246 [ 24.096186] RAX: dffffc0000000000 RBX: ffffeafff92e0000 RCX: ffffea0006d18000 [ 24.103444] RDX: 1ffffd5fff25c004 RSI: ffffffff814f5128 RDI: ffffeafff92e0000 [ 24.110700] RBP: ffff8801b5fcf970 R08: ffff8801b68008e8 R09: 0000000000000001 [ 24.117957] R10: ffff8801b6800000 R11: 0000000000000001 R12: ffff8801b5fcfc08 [ 24.125214] R13: ffffeafff92e0020 R14: ffffeafff92e0000 R15: 0000000000000001 [ 24.132472] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.140687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.146556] CR2: ffffeafff92e0020 CR3: 000000000461e000 CR4: 00000000001606f0 [ 24.153970] Stack: [ 24.156110] ffffeafff92e0020 ffff8801b5fcfc08 ffff8801c9d8e838 ffffeafff92e0000 [ 24.164213] ffff8801b66dfdc0 ffff8801b5fcf9c8 ffffffff8154bfcf ffff8801b5fcfc18 [ 24.172351] ffff8801b5fcfc10 ffff8801b5fcfc88 00003ffe4b8001a0 00000001c9d8e000 [ 24.180600] Call Trace: [ 24.183185] [] zap_huge_pmd+0x16f/0x860 [ 24.188809] [] unmap_page_range+0x12ad/0x1730 [ 24.195032] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.201459] [] unmap_single_vma+0x101/0x260 [ 24.207420] [] unmap_vmas+0x102/0x1d0 [ 24.212880] [] exit_mmap+0x214/0x3f0 [ 24.218234] [] ? SyS_munmap+0xa0/0xa0 [ 24.223723] [] ? up_write+0x1a/0x60 [ 24.228993] [] mmput+0xf3/0x2d0 [ 24.233914] [] do_exit+0x906/0x27b0 [ 24.239182] [] ? release_task.part.19+0x1210/0x1210 [ 24.245912] [] ? up_write+0x1a/0x60 [ 24.251183] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.257316] [] ? mprotect_fixup+0x930/0x930 [ 24.263326] [] do_group_exit+0x111/0x340 [ 24.269028] [] ? do_group_exit+0x340/0x340 [ 24.274902] [] SyS_exit_group+0x1d/0x20 [ 24.280530] [] do_syscall_64+0x1a6/0x490 [ 24.286230] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.293140] 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 [ 24.321256] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.327630] RSP [ 24.331286] CR2: ffffeafff92e0020 [ 24.334730] ---[ end trace 4c1b2c04d23c0e5d ]--- [ 24.339526] Kernel panic - not syncing: Fatal exception [ 24.345411] Dumping ftrace buffer: [ 24.348956] (ftrace buffer empty) [ 24.352654] Kernel Offset: disabled [ 24.356268] Rebooting in 86400 seconds..