[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.098564] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.624585] random: sshd: uninitialized urandom read (32 bytes read) [ 13.782379] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.607468] random: sshd: uninitialized urandom read (32 bytes read) [ 14.744933] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 20.442872] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.520764] BUG: unable to handle kernel paging request at ffffeafff90f8020 [ 20.528132] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.534418] PGD 0 [ 20.536368] [ 20.537989] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.542475] Dumping ftrace buffer: [ 20.545990] (ftrace buffer empty) [ 20.549679] Modules linked in: [ 20.552970] CPU: 0 PID: 3786 Comm: syz-executor363 Not tainted 4.9.122-g54068d6 #26 [ 20.560770] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.570130] task: ffff8801b8e58000 task.stack: ffff8801bc5d0000 [ 20.576168] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.584852] RSP: 0018:ffff8801bc5d7948 EFLAGS: 00010246 [ 20.590281] RAX: dffffc0000000000 RBX: ffffeafff90f8000 RCX: 0000000000000000 [ 20.597560] RDX: 1ffffd5fff21f004 RSI: ffffffff814f5918 RDI: ffffeafff90f8000 [ 20.604817] RBP: ffff8801bc5d7970 R08: 0000000000034580 R09: 0000000000000001 [ 20.612073] R10: ffff8801b8e58000 R11: 0000000000000001 R12: ffff8801bc5d7c08 [ 20.619347] R13: ffffeafff90f8020 R14: ffffeafff90f8000 R15: 0000000000000001 [ 20.626600] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.634823] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.640691] CR2: ffffeafff90f8020 CR3: 00000001c2290000 CR4: 00000000001606f0 [ 20.647937] Stack: [ 20.650061] ffffeafff90f8020 ffff8801bc5d7c08 ffff8801bef94800 ffffeafff90f8000 [ 20.658056] ffff8801b8e77268 ffff8801bc5d79c8 ffffffff8154cb8f ffff8801bc5d7c18 [ 20.666174] ffff8801bc5d7c10 ffff8801bc5d7c88 00003ffe43e001e0 00000001bef94000 [ 20.674194] Call Trace: [ 20.676770] [] zap_huge_pmd+0x16f/0x860 [ 20.682379] [] unmap_page_range+0x12ad/0x1730 [ 20.688509] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.694811] [] unmap_single_vma+0x101/0x260 [ 20.700767] [] unmap_vmas+0x102/0x1d0 [ 20.706215] [] exit_mmap+0x214/0x3f0 [ 20.711558] [] ? SyS_munmap+0xa0/0xa0 [ 20.716988] [] ? up_write+0x1a/0x60 [ 20.722247] [] mmput+0xf3/0x2d0 [ 20.727185] [] do_exit+0x906/0x27b0 [ 20.732467] [] ? release_task.part.19+0x1210/0x1210 [ 20.739134] [] ? up_write+0x1a/0x60 [ 20.744417] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.750564] [] ? mprotect_fixup+0x930/0x930 [ 20.756521] [] do_group_exit+0x111/0x340 [ 20.762236] [] ? do_group_exit+0x340/0x340 [ 20.768104] [] SyS_exit_group+0x1d/0x20 [ 20.773738] [] do_syscall_64+0x1a6/0x490 [ 20.779435] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.786342] 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 [ 20.813183] RIP [] page_remove_rmap+0x37/0x6d0 [ 20.819543] RSP [ 20.823142] CR2: ffffeafff90f8020 [ 20.826571] ---[ end trace 46a71c8bcdc13381 ]--- [ 20.831299] Kernel panic - not syncing: Fatal exception [ 20.836955] Dumping ftrace buffer: [ 20.840484] (ftrace buffer empty) [ 20.844172] Kernel Offset: disabled [ 20.847775] Rebooting in 86400 seconds..