[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.663782] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.181470] random: sshd: uninitialized urandom read (32 bytes read) [ 26.664679] random: sshd: uninitialized urandom read (32 bytes read) [ 27.146245] random: sshd: uninitialized urandom read (32 bytes read) [ 32.678863] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 38.389041] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.472976] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 38.480366] IP: [] page_remove_rmap+0x37/0x6d0 [ 38.486615] PGD 0 [ 38.488561] [ 38.490182] Oops: 0000 [#1] PREEMPT SMP KASAN [ 38.494711] Dumping ftrace buffer: [ 38.498227] (ftrace buffer empty) [ 38.501914] Modules linked in: [ 38.505200] CPU: 0 PID: 3806 Comm: syz-executor111 Not tainted 4.9.122-g54068d6 #26 [ 38.512969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.522302] task: ffff8801b81cb000 task.stack: ffff8801b9760000 [ 38.528336] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 38.537023] RSP: 0018:ffff8801b9767948 EFLAGS: 00010246 [ 38.542448] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 38.549694] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 38.556985] RBP: ffff8801b9767970 R08: 0000000000034340 R09: 0000000000000001 [ 38.564235] R10: ffff8801b81cb000 R11: 0000000000000001 R12: ffff8801b9767c08 [ 38.571487] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 38.578776] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.586981] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.593008] CR2: ffffeafff90e8020 CR3: 00000001baa9a000 CR4: 00000000001606f0 [ 38.600255] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.607501] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.614748] Stack: [ 38.616875] ffffeafff90e8020 ffff8801b9767c08 ffff8801c76cb800 ffffeafff90e8000 [ 38.624855] ffff8801b6570d10 ffff8801b97679c8 ffffffff8154cb8f ffff8801b9767c18 [ 38.632891] ffff8801b9767c10 ffff8801b9767c88 00003ffe43a001e0 00000001c76cb000 [ 38.640950] Call Trace: [ 38.643519] [] zap_huge_pmd+0x16f/0x860 [ 38.649127] [] unmap_page_range+0x12ad/0x1730 [ 38.655250] [] ? vm_normal_page_pmd+0x310/0x310 [ 38.661551] [] unmap_single_vma+0x101/0x260 [ 38.667551] [] unmap_vmas+0x102/0x1d0 [ 38.672982] [] exit_mmap+0x214/0x3f0 [ 38.678319] [] ? SyS_munmap+0xa0/0xa0 [ 38.683744] [] ? up_write+0x1a/0x60 [ 38.688992] [] mmput+0xf3/0x2d0 [ 38.693894] [] do_exit+0x906/0x27b0 [ 38.699145] [] ? release_task.part.19+0x1210/0x1210 [ 38.705785] [] ? up_write+0x1a/0x60 [ 38.711041] [] ? do_mprotect_pkey+0x71d/0x890 [ 38.717162] [] ? mprotect_fixup+0x930/0x930 [ 38.723108] [] do_group_exit+0x111/0x340 [ 38.728799] [] ? do_group_exit+0x340/0x340 [ 38.734660] [] SyS_exit_group+0x1d/0x20 [ 38.740258] [] do_syscall_64+0x1a6/0x490 [ 38.745943] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 38.752837] 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 [ 38.779793] RIP [] page_remove_rmap+0x37/0x6d0 [ 38.786121] RSP [ 38.789718] CR2: ffffeafff90e8020 [ 38.793150] ---[ end trace ceefafdbba0b26b6 ]--- [ 38.797876] Kernel panic - not syncing: Fatal exception [ 38.803557] Dumping ftrace buffer: [ 38.807133] (ftrace buffer empty) [ 38.810824] Kernel Offset: disabled [ 38.814424] Rebooting in 86400 seconds..