[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.715984] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.742369] random: sshd: uninitialized urandom read (32 bytes read) [ 18.982486] random: sshd: uninitialized urandom read (32 bytes read) [ 19.556441] random: sshd: uninitialized urandom read (32 bytes read) [ 24.101677] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 29.620249] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.699712] BUG: unable to handle kernel paging request at ffffeafff90f0020 [ 29.707076] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.713329] PGD 0 [ 29.715279] [ 29.716898] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.721368] Dumping ftrace buffer: [ 29.724877] (ftrace buffer empty) [ 29.728559] Modules linked in: [ 29.731854] CPU: 0 PID: 3801 Comm: syz-executor547 Not tainted 4.9.122-g54068d6 #78 [ 29.739616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.748942] task: ffff8801b7ae3000 task.stack: ffff8801b6018000 [ 29.755061] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.763761] RSP: 0018:ffff8801b601f948 EFLAGS: 00010246 [ 29.769314] RAX: dffffc0000000000 RBX: ffffeafff90f0000 RCX: 0000000000000000 [ 29.776564] RDX: 1ffffd5fff21e004 RSI: ffffffff814f5918 RDI: ffffeafff90f0000 [ 29.783903] RBP: ffff8801b601f970 R08: 0000000000033fc0 R09: 0000000000000001 [ 29.791253] R10: ffff8801b7ae3000 R11: 0000000000000001 R12: ffff8801b601fc08 [ 29.798505] R13: ffffeafff90f0020 R14: ffffeafff90f0000 R15: 0000000000000001 [ 29.805758] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.814003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.819865] CR2: ffffeafff90f0020 CR3: 00000001c2835000 CR4: 00000000001606f0 [ 29.827220] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.834508] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.841795] Stack: [ 29.843927] ffffeafff90f0020 ffff8801b601fc08 ffff8801c3d89800 ffffeafff90f0000 [ 29.851934] ffff8801b7ac1ec8 ffff8801b601f9c8 ffffffff8154cb8f ffff8801b601fc18 [ 29.859925] ffff8801b601fc10 ffff8801b601fc88 00003ffe43c001e0 00000001c3d89000 [ 29.868008] Call Trace: [ 29.870580] [] zap_huge_pmd+0x16f/0x860 [ 29.876185] [] unmap_page_range+0x12ad/0x1730 [ 29.882312] [] ? vm_normal_page_pmd+0x310/0x310 [ 29.888612] [] unmap_single_vma+0x101/0x260 [ 29.894559] [] unmap_vmas+0x102/0x1d0 [ 29.899982] [] exit_mmap+0x214/0x3f0 [ 29.905318] [] ? SyS_munmap+0xa0/0xa0 [ 29.910745] [] ? up_write+0x1a/0x60 [ 29.915997] [] mmput+0xf3/0x2d0 [ 29.920902] [] do_exit+0x906/0x27b0 [ 29.926154] [] ? release_task.part.19+0x1210/0x1210 [ 29.932794] [] ? up_write+0x1a/0x60 [ 29.938088] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.944217] [] ? mprotect_fixup+0x930/0x930 [ 29.950169] [] do_group_exit+0x111/0x340 [ 29.955858] [] ? do_group_exit+0x340/0x340 [ 29.961766] [] SyS_exit_group+0x1d/0x20 [ 29.967373] [] do_syscall_64+0x1a6/0x490 [ 29.973060] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.979999] 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 [ 30.007211] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.013546] RSP [ 30.017144] CR2: ffffeafff90f0020 [ 30.020575] ---[ end trace 9544287533af3845 ]--- [ 30.025301] Kernel panic - not syncing: Fatal exception [ 30.030966] Dumping ftrace buffer: [ 30.034478] (ftrace buffer empty) [ 30.038299] Kernel Offset: disabled [ 30.041907] Rebooting in 86400 seconds..