[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.370828] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.772436] random: sshd: uninitialized urandom read (32 bytes read) [ 14.020563] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.852794] random: sshd: uninitialized urandom read (32 bytes read) [ 14.993069] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 20.607784] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.691608] BUG: unable to handle kernel paging request at ffffeafff9118020 [ 20.698979] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.705234] PGD 0 [ 20.707178] [ 20.708799] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.713281] Dumping ftrace buffer: [ 20.716795] (ftrace buffer empty) [ 20.720485] Modules linked in: [ 20.723777] CPU: 1 PID: 3788 Comm: syz-executor800 Not tainted 4.9.122-g54068d6 #26 [ 20.731568] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.740917] task: ffff8801b886b000 task.stack: ffff8801b72c0000 [ 20.746946] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.755636] RSP: 0018:ffff8801b72c7948 EFLAGS: 00010246 [ 20.761068] RAX: dffffc0000000000 RBX: ffffeafff9118000 RCX: 0000000000000000 [ 20.768315] RDX: 1ffffd5fff223004 RSI: ffffffff814f5918 RDI: ffffeafff9118000 [ 20.775564] RBP: ffff8801b72c7970 R08: 0000000000034420 R09: 0000000000000001 [ 20.782811] R10: ffff8801b886b000 R11: 0000000000000001 R12: ffff8801b72c7c08 [ 20.790058] R13: ffffeafff9118020 R14: ffffeafff9118000 R15: 0000000000000001 [ 20.797320] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.805544] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.811400] CR2: ffffeafff9118020 CR3: 00000001c6031000 CR4: 00000000001606f0 [ 20.818645] Stack: [ 20.820773] ffffeafff9118020 ffff8801b72c7c08 ffff8801c6004800 ffffeafff9118000 [ 20.828780] ffff8801b7e3b6e0 ffff8801b72c79c8 ffffffff8154cb8f ffff8801b72c7c18 [ 20.836787] ffff8801b72c7c10 ffff8801b72c7c88 00003ffe446001e0 00000001c6004000 [ 20.844772] Call Trace: [ 20.847336] [] zap_huge_pmd+0x16f/0x860 [ 20.852938] [] unmap_page_range+0x12ad/0x1730 [ 20.859083] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.865374] [] unmap_single_vma+0x101/0x260 [ 20.871325] [] unmap_vmas+0x102/0x1d0 [ 20.876748] [] exit_mmap+0x214/0x3f0 [ 20.882084] [] ? SyS_munmap+0xa0/0xa0 [ 20.887537] [] ? up_write+0x1a/0x60 [ 20.892797] [] mmput+0xf3/0x2d0 [ 20.897702] [] do_exit+0x906/0x27b0 [ 20.902955] [] ? release_task.part.19+0x1210/0x1210 [ 20.909617] [] ? up_write+0x1a/0x60 [ 20.914869] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.921010] [] ? mprotect_fixup+0x930/0x930 [ 20.926979] [] do_group_exit+0x111/0x340 [ 20.932680] [] ? do_group_exit+0x340/0x340 [ 20.938541] [] SyS_exit_group+0x1d/0x20 [ 20.944149] [] do_syscall_64+0x1a6/0x490 [ 20.949839] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.956735] 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 [ 20.983506] RIP [] page_remove_rmap+0x37/0x6d0 [ 20.989834] RSP [ 20.993431] CR2: ffffeafff9118020 [ 20.996865] ---[ end trace 9553b2e12397ecac ]--- [ 21.001595] Kernel panic - not syncing: Fatal exception [ 21.007295] Dumping ftrace buffer: [ 21.010813] (ftrace buffer empty) [ 21.014501] Kernel Offset: disabled [ 21.018108] Rebooting in 86400 seconds..