[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.931982] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.645518] random: sshd: uninitialized urandom read (32 bytes read) [ 14.924783] random: sshd: uninitialized urandom read (32 bytes read) [ 15.392962] random: sshd: uninitialized urandom read (32 bytes read) [ 22.066667] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 27.817604] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.899319] BUG: unable to handle kernel paging request at ffffeafff8fc8020 [ 27.906811] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.913059] PGD 0 [ 27.915004] [ 27.916626] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.921094] Dumping ftrace buffer: [ 27.924606] (ftrace buffer empty) [ 27.928290] Modules linked in: [ 27.931579] CPU: 0 PID: 3763 Comm: syz-executor889 Not tainted 4.9.121-g681e57b #25 [ 27.939351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.948687] task: ffff8801bd2e3000 task.stack: ffff8801bbcc0000 [ 27.954717] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.963394] RSP: 0018:ffff8801bbcc7948 EFLAGS: 00010246 [ 27.968819] RAX: dffffc0000000000 RBX: ffffeafff8fc8000 RCX: 0000000000000000 [ 27.976136] RDX: 1ffffd5fff1f9004 RSI: ffffffff814f5278 RDI: ffffeafff8fc8000 [ 27.983393] RBP: ffff8801bbcc7970 R08: 0000000000033840 R09: 0000000000000001 [ 27.990688] R10: ffff8801bd2e3000 R11: 0000000000000001 R12: ffff8801bbcc7c08 [ 27.998018] R13: ffffeafff8fc8020 R14: ffffeafff8fc8000 R15: 0000000000000001 [ 28.005282] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.013589] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.019452] CR2: ffffeafff8fc8020 CR3: 00000001c4da2000 CR4: 00000000001606f0 [ 28.026703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.034044] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.041403] Stack: [ 28.043529] ffffeafff8fc8020 ffff8801bbcc7c08 ffff8801c303b800 ffffeafff8fc8000 [ 28.051523] ffff8801bdbd72c0 ffff8801bbcc79c8 ffffffff8154c20f ffff8801bbcc7c18 [ 28.059506] ffff8801bbcc7c10 ffff8801bbcc7c88 00003ffe3f2001e0 00000001c303b000 [ 28.067489] Call Trace: [ 28.070054] [] zap_huge_pmd+0x16f/0x860 [ 28.075652] [] unmap_page_range+0x12ad/0x1730 [ 28.081775] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.088068] [] unmap_single_vma+0x101/0x260 [ 28.094098] [] unmap_vmas+0x102/0x1d0 [ 28.099856] [] exit_mmap+0x214/0x3f0 [ 28.105205] [] ? SyS_munmap+0xa0/0xa0 [ 28.110634] [] ? up_write+0x1a/0x60 [ 28.115957] [] mmput+0xf3/0x2d0 [ 28.120881] [] do_exit+0x906/0x27b0 [ 28.126144] [] ? release_task.part.19+0x1210/0x1210 [ 28.132788] [] ? up_write+0x1a/0x60 [ 28.138038] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.144157] [] ? mprotect_fixup+0x930/0x930 [ 28.150237] [] do_group_exit+0x111/0x340 [ 28.155927] [] ? do_group_exit+0x340/0x340 [ 28.161786] [] SyS_exit_group+0x1d/0x20 [ 28.167384] [] do_syscall_64+0x1a6/0x490 [ 28.173078] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.179977] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 28.207132] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.213528] RSP [ 28.217128] CR2: ffffeafff8fc8020 [ 28.220559] ---[ end trace 91c8fa8ff1696775 ]--- [ 28.225296] Kernel panic - not syncing: Fatal exception [ 28.230992] Dumping ftrace buffer: [ 28.234513] (ftrace buffer empty) [ 28.238248] Kernel Offset: disabled [ 28.241876] Rebooting in 86400 seconds..