[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.928393] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.675315] random: sshd: uninitialized urandom read (32 bytes read) [ 25.289650] random: sshd: uninitialized urandom read (32 bytes read) [ 25.804434] random: sshd: uninitialized urandom read (32 bytes read) [ 42.004016] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 47.509222] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.593082] BUG: unable to handle kernel paging request at ffffeafff9130020 [ 47.600536] IP: [] page_remove_rmap+0x37/0x6d0 [ 47.606781] PGD 0 [ 47.608728] [ 47.610354] Oops: 0000 [#1] PREEMPT SMP KASAN [ 47.614875] Dumping ftrace buffer: [ 47.618398] (ftrace buffer empty) [ 47.622086] Modules linked in: [ 47.625374] CPU: 0 PID: 3818 Comm: syz-executor628 Not tainted 4.9.122-g54068d6 #78 [ 47.633148] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.642480] task: ffff8801b6c30000 task.stack: ffff8801da368000 [ 47.648508] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 47.657186] RSP: 0018:ffff8801da36f948 EFLAGS: 00010246 [ 47.662607] RAX: dffffc0000000000 RBX: ffffeafff9130000 RCX: 0000000000000000 [ 47.669895] RDX: 1ffffd5fff226004 RSI: ffffffff814f5918 RDI: ffffeafff9130000 [ 47.677185] RBP: ffff8801da36f970 R08: 0000000000034ce0 R09: 0000000000000001 [ 47.684439] R10: ffff8801b6c30000 R11: 0000000000000001 R12: ffff8801da36fc08 [ 47.691685] R13: ffffeafff9130020 R14: ffffeafff9130000 R15: 0000000000000001 [ 47.698932] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.707133] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.712988] CR2: ffffeafff9130020 CR3: 00000001ca3a4000 CR4: 00000000001606f0 [ 47.720232] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.727477] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.734715] Stack: [ 47.736913] ffffeafff9130020 ffff8801da36fc08 ffff8801ca19e800 ffffeafff9130000 [ 47.744977] ffff8801b6ca6c08 ffff8801da36f9c8 ffffffff8154cb8f ffff8801da36fc18 [ 47.752963] ffff8801da36fc10 ffff8801da36fc88 00003ffe44c001e0 00000001ca19e000 [ 47.760997] Call Trace: [ 47.763564] [] zap_huge_pmd+0x16f/0x860 [ 47.769163] [] unmap_page_range+0x12ad/0x1730 [ 47.775296] [] ? vm_normal_page_pmd+0x310/0x310 [ 47.781589] [] unmap_single_vma+0x101/0x260 [ 47.787539] [] unmap_vmas+0x102/0x1d0 [ 47.792963] [] exit_mmap+0x214/0x3f0 [ 47.798300] [] ? SyS_munmap+0xa0/0xa0 [ 47.803725] [] ? up_write+0x1a/0x60 [ 47.808981] [] mmput+0xf3/0x2d0 [ 47.813882] [] do_exit+0x906/0x27b0 [ 47.819134] [] ? release_task.part.19+0x1210/0x1210 [ 47.825910] [] ? up_write+0x1a/0x60 [ 47.831162] [] ? do_mprotect_pkey+0x71d/0x890 [ 47.837281] [] ? mprotect_fixup+0x930/0x930 [ 47.843232] [] do_group_exit+0x111/0x340 [ 47.848916] [] ? do_group_exit+0x340/0x340 [ 47.854777] [] SyS_exit_group+0x1d/0x20 [ 47.860374] [] do_syscall_64+0x1a6/0x490 [ 47.866064] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 47.872956] 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 [ 47.899908] RIP [] page_remove_rmap+0x37/0x6d0 [ 47.906302] RSP [ 47.909906] CR2: ffffeafff9130020 [ 47.913333] ---[ end trace 634bc435b8e01cb1 ]--- [ 47.918069] Kernel panic - not syncing: Fatal exception [ 47.923750] Dumping ftrace buffer: [ 47.927270] (ftrace buffer empty) [ 47.930953] Kernel Offset: disabled [ 47.934554] Rebooting in 86400 seconds..