[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.112354] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.724752] random: sshd: uninitialized urandom read (32 bytes read) [ 16.978029] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.785972] random: sshd: uninitialized urandom read (32 bytes read) [ 17.921458] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 23.426414] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.507023] BUG: unable to handle kernel paging request at ffffeafff8db0020 [ 23.514436] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.520712] PGD 0 [ 23.522697] [ 23.524322] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.528795] Dumping ftrace buffer: [ 23.532310] (ftrace buffer empty) [ 23.536001] Modules linked in: [ 23.539297] CPU: 0 PID: 3790 Comm: syz-executor202 Not tainted 4.9.122-g54068d6 #26 [ 23.547145] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.556486] task: ffff8801b7413000 task.stack: ffff8801b3a60000 [ 23.562524] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.571227] RSP: 0018:ffff8801b3a67948 EFLAGS: 00010246 [ 23.576659] RAX: dffffc0000000000 RBX: ffffeafff8db0000 RCX: ffffea0006cb8000 [ 23.583937] RDX: 1ffffd5fff1b6004 RSI: ffffffff814f5918 RDI: ffffeafff8db0000 [ 23.591196] RBP: ffff8801b3a67970 R08: 0000000000033ca0 R09: 0000000000000001 [ 23.598451] R10: ffff8801b7413000 R11: 0000000000000001 R12: ffff8801b3a67c08 [ 23.605707] R13: ffffeafff8db0020 R14: ffffeafff8db0000 R15: 0000000000000001 [ 23.612961] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.621174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.627040] CR2: ffffeafff8db0020 CR3: 00000001c16d0000 CR4: 00000000001606f0 [ 23.634297] Stack: [ 23.636433] ffffeafff8db0020 ffff8801b3a67c08 ffff8801bf372800 ffffeafff8db0000 [ 23.644441] ffff8801ba1c1dc0 ffff8801b3a679c8 ffffffff8154cb8f ffff8801b3a67c18 [ 23.652462] ffff8801b3a67c10 ffff8801b3a67c88 00003ffe36c001e0 00000001bf372000 [ 23.660483] Call Trace: [ 23.663055] [] zap_huge_pmd+0x16f/0x860 [ 23.668664] [] unmap_page_range+0x12ad/0x1730 [ 23.674801] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.681133] [] unmap_single_vma+0x101/0x260 [ 23.687103] [] unmap_vmas+0x102/0x1d0 [ 23.692561] [] exit_mmap+0x214/0x3f0 [ 23.697938] [] ? SyS_munmap+0xa0/0xa0 [ 23.703400] [] ? up_write+0x1a/0x60 [ 23.708662] [] mmput+0xf3/0x2d0 [ 23.713583] [] do_exit+0x906/0x27b0 [ 23.718845] [] ? release_task.part.19+0x1210/0x1210 [ 23.725495] [] ? up_write+0x1a/0x60 [ 23.730759] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.736891] [] ? mprotect_fixup+0x930/0x930 [ 23.742884] [] do_group_exit+0x111/0x340 [ 23.748585] [] ? do_group_exit+0x340/0x340 [ 23.754457] [] SyS_exit_group+0x1d/0x20 [ 23.760066] [] do_syscall_64+0x1a6/0x490 [ 23.765763] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.772668] 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 [ 23.799795] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.806156] RSP [ 23.809762] CR2: ffffeafff8db0020 [ 23.813219] ---[ end trace bee2f871a3c7374d ]--- [ 23.817955] Kernel panic - not syncing: Fatal exception [ 23.823687] Dumping ftrace buffer: [ 23.827219] (ftrace buffer empty) [ 23.830906] Kernel Offset: disabled [ 23.834510] Rebooting in 86400 seconds..