[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.857961] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.353383] random: sshd: uninitialized urandom read (32 bytes read) [ 22.575377] random: sshd: uninitialized urandom read (32 bytes read) [ 22.953576] random: sshd: uninitialized urandom read (32 bytes read) [ 39.401117] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 44.898063] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 44.979859] BUG: unable to handle kernel paging request at ffffeafff8f50020 [ 44.987235] IP: [] page_remove_rmap+0x37/0x6d0 [ 44.993486] PGD 0 [ 44.995434] [ 44.997065] Oops: 0000 [#1] PREEMPT SMP KASAN [ 45.001543] Dumping ftrace buffer: [ 45.005183] (ftrace buffer empty) [ 45.008876] Modules linked in: [ 45.012169] CPU: 0 PID: 3736 Comm: syz-executor315 Not tainted 4.9.122-g54068d6 #78 [ 45.019941] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.029323] task: ffff8801c079b000 task.stack: ffff8801c0460000 [ 45.035381] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 45.044076] RSP: 0018:ffff8801c0467948 EFLAGS: 00010246 [ 45.049502] RAX: dffffc0000000000 RBX: ffffeafff8f50000 RCX: 0000000000000000 [ 45.056750] RDX: 1ffffd5fff1ea004 RSI: ffffffff814f5918 RDI: ffffeafff8f50000 [ 45.063997] RBP: ffff8801c0467970 R08: 00000000000344e0 R09: 0000000000000001 [ 45.071243] R10: ffff8801c079b000 R11: 0000000000000001 R12: ffff8801c0467c08 [ 45.078593] R13: ffffeafff8f50020 R14: ffffeafff8f50000 R15: 0000000000000001 [ 45.085849] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 45.094052] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.099913] CR2: ffffeafff8f50020 CR3: 00000001c8a56000 CR4: 00000000001606f0 [ 45.107165] Stack: [ 45.109293] ffffeafff8f50020 ffff8801c0467c08 ffff8801c7e89800 ffffeafff8f50000 [ 45.117293] ffff8801c1be91b8 ffff8801c04679c8 ffffffff8154cb8f ffff8801c0467c18 [ 45.125283] ffff8801c0467c10 ffff8801c0467c88 00003ffe3d4001e0 00000001c7e89000 [ 45.133384] Call Trace: [ 45.135962] [] zap_huge_pmd+0x16f/0x860 [ 45.141578] [] unmap_page_range+0x12ad/0x1730 [ 45.147710] [] ? vm_normal_page_pmd+0x310/0x310 [ 45.154006] [] unmap_single_vma+0x101/0x260 [ 45.159954] [] unmap_vmas+0x102/0x1d0 [ 45.165382] [] exit_mmap+0x214/0x3f0 [ 45.170725] [] ? SyS_munmap+0xa0/0xa0 [ 45.176284] [] ? up_write+0x1a/0x60 [ 45.181547] [] mmput+0xf3/0x2d0 [ 45.186468] [] do_exit+0x906/0x27b0 [ 45.191730] [] ? release_task.part.19+0x1210/0x1210 [ 45.198394] [] ? up_write+0x1a/0x60 [ 45.203654] [] ? do_mprotect_pkey+0x71d/0x890 [ 45.209782] [] ? mprotect_fixup+0x930/0x930 [ 45.215793] [] do_group_exit+0x111/0x340 [ 45.221593] [] ? do_group_exit+0x340/0x340 [ 45.227468] [] SyS_exit_group+0x1d/0x20 [ 45.233071] [] do_syscall_64+0x1a6/0x490 [ 45.238765] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 45.245669] 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 [ 45.273012] RIP [] page_remove_rmap+0x37/0x6d0 [ 45.279571] RSP [ 45.283179] CR2: ffffeafff8f50020 [ 45.286615] ---[ end trace 67f74f60ff4fb260 ]--- [ 45.291354] Kernel panic - not syncing: Fatal exception [ 45.296961] Dumping ftrace buffer: [ 45.300482] (ftrace buffer empty) [ 45.304214] Kernel Offset: disabled [ 45.307825] Rebooting in 86400 seconds..