[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.530116] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.924345] random: sshd: uninitialized urandom read (32 bytes read) [ 27.428837] random: sshd: uninitialized urandom read (32 bytes read) [ 27.827404] random: sshd: uninitialized urandom read (32 bytes read) [ 27.953798] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 33.547699] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.628679] BUG: unable to handle kernel paging request at ffffeafff8ff8020 [ 33.636158] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 33.642418] PGD 0 [ 33.644360] [ 33.645974] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.650475] Dumping ftrace buffer: [ 33.653990] (ftrace buffer empty) [ 33.657670] Modules linked in: [ 33.661384] CPU: 0 PID: 3786 Comm: syz-executor117 Not tainted 4.9.122-g54068d6 #26 [ 33.669144] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.678465] task: ffff8801bcf46000 task.stack: ffff8801d9840000 [ 33.684486] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 33.693154] RSP: 0018:ffff8801d9847948 EFLAGS: 00010246 [ 33.698572] RAX: dffffc0000000000 RBX: ffffeafff8ff8000 RCX: 0000000000000000 [ 33.705814] RDX: 1ffffd5fff1ff004 RSI: ffffffff814f5918 RDI: ffffeafff8ff8000 [ 33.713053] RBP: ffff8801d9847970 R08: 00000000000335a0 R09: 0000000000000001 [ 33.720296] R10: ffff8801bcf46000 R11: 0000000000000001 R12: ffff8801d9847c08 [ 33.727540] R13: ffffeafff8ff8020 R14: ffffeafff8ff8000 R15: 0000000000000001 [ 33.734860] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.743057] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.748906] CR2: ffffeafff8ff8020 CR3: 00000001beec4000 CR4: 00000000001606f0 [ 33.756157] Stack: [ 33.758271] ffffeafff8ff8020 ffff8801d9847c08 ffff8801bee61800 ffffeafff8ff8000 [ 33.766274] ffff8801ba147268 ffff8801d98479c8 ffffffff8154cb8f ffff8801d9847c18 [ 33.774226] ffff8801d9847c10 ffff8801d9847c88 00003ffe3fe001e0 00000001bee61000 [ 33.782190] Call Trace: [ 33.784743] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 33.790349] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 33.796462] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 33.802761] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 33.808701] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 33.814116] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 33.819445] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 33.824865] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 33.830109] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 33.835023] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 33.840283] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 33.846918] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 33.852160] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 33.858270] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 33.864224] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 33.870080] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 33.875941] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 33.881552] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 33.887346] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.894287] 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 [ 33.921404] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 33.927741] RSP <ffff8801d9847948> [ 33.931335] CR2: ffffeafff8ff8020 [ 33.934766] ---[ end trace c138949e62ff02f6 ]--- [ 33.939492] Kernel panic - not syncing: Fatal exception [ 33.945301] Dumping ftrace buffer: [ 33.948830] (ftrace buffer empty) [ 33.952533] Kernel Offset: disabled [ 33.956197] Rebooting in 86400 seconds..