[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.439580] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.808299] random: sshd: uninitialized urandom read (32 bytes read) [ 15.229891] random: sshd: uninitialized urandom read (32 bytes read) [ 15.707256] random: sshd: uninitialized urandom read (32 bytes read) [ 15.851377] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 21.578962] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.654955] BUG: unable to handle kernel paging request at ffffeafff8fa8020 [ 21.662303] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.668565] PGD 0 [ 21.670511] [ 21.672131] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.676598] Dumping ftrace buffer: [ 21.680108] (ftrace buffer empty) [ 21.683810] Modules linked in: [ 21.687095] CPU: 1 PID: 3756 Comm: syz-executor630 Not tainted 4.9.121-g681e57b #25 [ 21.694859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.704188] task: ffff8801bd7e0000 task.stack: ffff8801bbc18000 [ 21.710224] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.718902] RSP: 0018:ffff8801bbc1f948 EFLAGS: 00010246 [ 21.724322] RAX: dffffc0000000000 RBX: ffffeafff8fa8000 RCX: 0000000000000000 [ 21.731653] RDX: 1ffffd5fff1f5004 RSI: ffffffff814f5278 RDI: ffffeafff8fa8000 [ 21.738910] RBP: ffff8801bbc1f970 R08: 0000000000033d60 R09: 0000000000000001 [ 21.746158] R10: ffff8801bd7e0000 R11: 0000000000000001 R12: ffff8801bbc1fc08 [ 21.753404] R13: ffffeafff8fa8020 R14: ffffeafff8fa8000 R15: 0000000000000001 [ 21.760651] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 21.768853] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.774713] CR2: ffffeafff8fa8020 CR3: 00000001c5037000 CR4: 00000000001606f0 [ 21.781959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.789203] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.796452] Stack: [ 21.798574] ffffeafff8fa8020 ffff8801bbc1fc08 ffff8801c502f800 ffffeafff8fa8000 [ 21.806618] ffff8801c63692c0 ffff8801bbc1f9c8 ffffffff8154c20f ffff8801bbc1fc18 [ 21.814603] ffff8801bbc1fc10 ffff8801bbc1fc88 00003ffe3ea001e0 00000001c502f000 [ 21.822602] Call Trace: [ 21.825167] [] zap_huge_pmd+0x16f/0x860 [ 21.830792] [] unmap_page_range+0x12ad/0x1730 [ 21.836916] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 21.843210] [] unmap_single_vma+0x101/0x260 [ 21.849160] [] unmap_vmas+0x102/0x1d0 [ 21.854584] [] exit_mmap+0x214/0x3f0 [ 21.859920] [] ? SyS_munmap+0xa0/0xa0 [ 21.865347] [] ? up_write+0x1a/0x60 [ 21.870595] [] mmput+0xf3/0x2d0 [ 21.875501] [] do_exit+0x906/0x27b0 [ 21.880750] [] ? release_task.part.19+0x1210/0x1210 [ 21.887391] [] ? up_write+0x1a/0x60 [ 21.892641] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.898761] [] ? mprotect_fixup+0x930/0x930 [ 21.904710] [] do_group_exit+0x111/0x340 [ 21.910395] [] ? do_group_exit+0x340/0x340 [ 21.916254] [] SyS_exit_group+0x1d/0x20 [ 21.921892] [] do_syscall_64+0x1a6/0x490 [ 21.927579] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.934480] 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 [ 21.961260] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.967596] RSP [ 21.971476] CR2: ffffeafff8fa8020 [ 21.974904] ---[ end trace ff7c14d1d49664a7 ]--- [ 21.979631] Kernel panic - not syncing: Fatal exception [ 21.985330] Dumping ftrace buffer: [ 21.988847] (ftrace buffer empty) [ 21.992530] Kernel Offset: disabled [ 21.996131] Rebooting in 86400 seconds..