[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.042391] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.484567] random: sshd: uninitialized urandom read (32 bytes read) [ 13.731265] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.544576] random: sshd: uninitialized urandom read (32 bytes read) [ 28.615860] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 34.131972] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.218905] BUG: unable to handle kernel paging request at ffffeafff9110020 [ 34.226266] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.232509] PGD 0 [ 34.234551] [ 34.236174] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.240639] Dumping ftrace buffer: [ 34.244157] (ftrace buffer empty) [ 34.247841] Modules linked in: [ 34.251122] CPU: 0 PID: 3808 Comm: syz-executor677 Not tainted 4.9.122-g54068d6 #78 [ 34.258884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.268321] task: ffff8801b8ffb000 task.stack: ffff8801d90f0000 [ 34.274350] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.283022] RSP: 0018:ffff8801d90f7948 EFLAGS: 00010246 [ 34.288445] RAX: dffffc0000000000 RBX: ffffeafff9110000 RCX: 0000000000000000 [ 34.295689] RDX: 1ffffd5fff222004 RSI: ffffffff814f5918 RDI: ffffeafff9110000 [ 34.302963] RBP: ffff8801d90f7970 R08: 00000000000348c0 R09: 0000000000000001 [ 34.310208] R10: ffff8801b8ffb000 R11: 0000000000000001 R12: ffff8801d90f7c08 [ 34.317456] R13: ffffeafff9110020 R14: ffffeafff9110000 R15: 0000000000000001 [ 34.324701] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.332987] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.338842] CR2: ffffeafff9110020 CR3: 00000001c9524000 CR4: 00000000001606f0 [ 34.346088] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.353335] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.360574] Stack: [ 34.362699] ffffeafff9110020 ffff8801d90f7c08 ffff8801cc53d800 ffffeafff9110000 [ 34.370687] ffff8801c9fa0bb0 ffff8801d90f79c8 ffffffff8154cb8f ffff8801d90f7c18 [ 34.378688] ffff8801d90f7c10 ffff8801d90f7c88 00003ffe444001e0 00000001cc53d000 [ 34.386699] Call Trace: [ 34.389265] [] zap_huge_pmd+0x16f/0x860 [ 34.394864] [] unmap_page_range+0x12ad/0x1730 [ 34.400980] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.407270] [] unmap_single_vma+0x101/0x260 [ 34.413257] [] unmap_vmas+0x102/0x1d0 [ 34.418725] [] exit_mmap+0x214/0x3f0 [ 34.424071] [] ? SyS_munmap+0xa0/0xa0 [ 34.429544] [] ? up_write+0x1a/0x60 [ 34.434801] [] mmput+0xf3/0x2d0 [ 34.439704] [] do_exit+0x906/0x27b0 [ 34.444958] [] ? release_task.part.19+0x1210/0x1210 [ 34.451598] [] ? up_write+0x1a/0x60 [ 34.456847] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.462962] [] ? mprotect_fixup+0x930/0x930 [ 34.468905] [] do_group_exit+0x111/0x340 [ 34.474791] [] ? do_group_exit+0x340/0x340 [ 34.480654] [] SyS_exit_group+0x1d/0x20 [ 34.486253] [] do_syscall_64+0x1a6/0x490 [ 34.491937] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.498833] 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 [ 34.525746] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.532073] RSP [ 34.535668] CR2: ffffeafff9110020 [ 34.539095] ---[ end trace 09207b2eed7222a7 ]--- [ 34.543862] Kernel panic - not syncing: Fatal exception [ 34.549607] Dumping ftrace buffer: [ 34.553154] (ftrace buffer empty) [ 34.556937] Kernel Offset: disabled [ 34.560539] Rebooting in 86400 seconds..