[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.484461] 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: [ 19.742144] random: sshd: uninitialized urandom read (32 bytes read) [ 20.111883] random: sshd: uninitialized urandom read (32 bytes read) [ 20.590341] random: sshd: uninitialized urandom read (32 bytes read) [ 24.145589] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 29.640110] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.720631] BUG: unable to handle kernel paging request at ffffeafff8de0020 [ 29.728087] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 29.734343] PGD 0 [ 29.736291] [ 29.737913] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.742382] Dumping ftrace buffer: [ 29.745894] (ftrace buffer empty) [ 29.749580] Modules linked in: [ 29.752873] CPU: 1 PID: 3798 Comm: syz-executor938 Not tainted 4.9.122-g54068d6 #78 [ 29.760742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.770087] task: ffff8801b7471800 task.stack: ffff8801b8e08000 [ 29.776125] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 29.784897] RSP: 0018:ffff8801b8e0f948 EFLAGS: 00010246 [ 29.790320] RAX: dffffc0000000000 RBX: ffffeafff8de0000 RCX: 0000000000000000 [ 29.797701] RDX: 1ffffd5fff1bc004 RSI: ffffffff814f5918 RDI: ffffeafff8de0000 [ 29.804951] RBP: ffff8801b8e0f970 R08: 00000000000345e0 R09: 0000000000000001 [ 29.812212] R10: ffff8801b7471800 R11: 0000000000000001 R12: ffff8801b8e0fc08 [ 29.819519] R13: ffffeafff8de0020 R14: ffffeafff8de0000 R15: 0000000000000001 [ 29.826833] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.835048] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.840911] CR2: ffffeafff8de0020 CR3: 00000001c70c0000 CR4: 00000000001606f0 [ 29.848253] Stack: [ 29.850378] ffffeafff8de0020 ffff8801b8e0fc08 ffff8801c90f1800 ffffeafff8de0000 [ 29.858367] ffff8801cad42cb8 ffff8801b8e0f9c8 ffffffff8154cb8f ffff8801b8e0fc18 [ 29.866378] ffff8801b8e0fc10 ffff8801b8e0fc88 00003ffe378001e0 00000001c90f1000 [ 29.874365] Call Trace: [ 29.876933] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 29.882536] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 29.888657] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 29.895024] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 29.900976] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 29.906440] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 29.911785] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 29.917215] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 29.922471] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 29.927377] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 29.932627] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 29.939289] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 29.944553] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 29.950677] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 29.956624] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 29.962308] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 29.968173] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 29.973877] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 29.979567] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.986461] 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 [ 30.013606] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 30.019933] RSP <ffff8801b8e0f948> [ 30.023528] CR2: ffffeafff8de0020 [ 30.026955] ---[ end trace 49fad85c8e6d20af ]--- [ 30.031688] Kernel panic - not syncing: Fatal exception [ 30.037381] Dumping ftrace buffer: [ 30.040898] (ftrace buffer empty) [ 30.044581] Kernel Offset: disabled [ 30.048180] Rebooting in 86400 seconds..