[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.405108] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.303717] random: sshd: uninitialized urandom read (32 bytes read) [ 24.583909] random: sshd: uninitialized urandom read (32 bytes read) [ 25.073251] random: sshd: uninitialized urandom read (32 bytes read) [ 45.243328] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 50.892696] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 50.986179] BUG: unable to handle kernel paging request at ffffeafff9168020 [ 50.993576] IP: [] page_remove_rmap+0x37/0x6d0 [ 50.999825] PGD 0 [ 51.001773] [ 51.003395] Oops: 0000 [#1] PREEMPT SMP KASAN [ 51.007864] Dumping ftrace buffer: [ 51.011384] (ftrace buffer empty) [ 51.015079] Modules linked in: [ 51.018374] CPU: 1 PID: 3815 Comm: syz-executor047 Not tainted 4.9.120-gf85543b #76 [ 51.026142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.035470] task: ffff8801b8f39800 task.stack: ffff8801b94f0000 [ 51.041495] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 51.050167] RSP: 0018:ffff8801b94f7948 EFLAGS: 00010246 [ 51.055588] RAX: dffffc0000000000 RBX: ffffeafff9168000 RCX: 0000000000000000 [ 51.062829] RDX: 1ffffd5fff22d004 RSI: ffffffff814f5128 RDI: ffffeafff9168000 [ 51.070312] RBP: ffff8801b94f7970 R08: 00000000000348c0 R09: 0000000000000001 [ 51.077554] R10: ffff8801b8f39800 R11: 0000000000000001 R12: ffff8801b94f7c08 [ 51.084806] R13: ffffeafff9168020 R14: ffffeafff9168000 R15: 0000000000000001 [ 51.092052] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 51.100326] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.106187] CR2: ffffeafff9168020 CR3: 00000001ba99e000 CR4: 00000000001606f0 [ 51.113439] Stack: [ 51.115612] ffffeafff9168020 ffff8801b94f7c08 ffff8801baa14800 ffffeafff9168000 [ 51.123754] ffff8801b6e6e160 ffff8801b94f79c8 ffffffff8154bfcf ffff8801b94f7c18 [ 51.131929] ffff8801b94f7c10 ffff8801b94f7c88 00003ffe45a001e0 00000001baa14000 [ 51.139907] Call Trace: [ 51.142473] [] zap_huge_pmd+0x16f/0x860 [ 51.148077] [] unmap_page_range+0x12ad/0x1730 [ 51.154200] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 51.160493] [] unmap_single_vma+0x101/0x260 [ 51.166480] [] unmap_vmas+0x102/0x1d0 [ 51.171914] [] exit_mmap+0x214/0x3f0 [ 51.177256] [] ? SyS_munmap+0xa0/0xa0 [ 51.182682] [] ? up_write+0x1a/0x60 [ 51.187932] [] mmput+0xf3/0x2d0 [ 51.192978] [] do_exit+0x906/0x27b0 [ 51.198249] [] ? release_task.part.19+0x1210/0x1210 [ 51.204893] [] ? up_write+0x1a/0x60 [ 51.210149] [] ? do_mprotect_pkey+0x71d/0x890 [ 51.216275] [] ? mprotect_fixup+0x930/0x930 [ 51.222223] [] do_group_exit+0x111/0x340 [ 51.227905] [] ? do_group_exit+0x340/0x340 [ 51.233760] [] SyS_exit_group+0x1d/0x20 [ 51.239361] [] do_syscall_64+0x1a6/0x490 [ 51.245048] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 51.251947] 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 [ 51.278919] RIP [] page_remove_rmap+0x37/0x6d0 [ 51.285246] RSP [ 51.288842] CR2: ffffeafff9168020 [ 51.292271] ---[ end trace 0cf4d1f36ea3c6ea ]--- [ 51.296997] Kernel panic - not syncing: Fatal exception [ 51.302422] Dumping ftrace buffer: [ 51.305934] (ftrace buffer empty) [ 51.309618] Kernel Offset: disabled [ 51.313218] Rebooting in 86400 seconds..