[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.622887] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.919227] random: sshd: uninitialized urandom read (32 bytes read) [ 14.397772] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.942950] random: sshd: uninitialized urandom read (32 bytes read) [ 15.100680] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 20.718270] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.810520] BUG: unable to handle kernel paging request at ffffeafff91a0020 [ 20.817934] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.824215] PGD 0 [ 20.826177] [ 20.827816] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.832330] Dumping ftrace buffer: [ 20.835879] (ftrace buffer empty) [ 20.839578] Modules linked in: [ 20.842903] CPU: 1 PID: 3797 Comm: syz-executor211 Not tainted 4.9.121-g681e57b #25 [ 20.850683] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.860036] task: ffff8801b69ae000 task.stack: ffff8801b75e8000 [ 20.866188] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.875098] RSP: 0018:ffff8801b75ef948 EFLAGS: 00010246 [ 20.880655] RAX: dffffc0000000000 RBX: ffffeafff91a0000 RCX: 0000000000000000 [ 20.887920] RDX: 1ffffd5fff234004 RSI: ffffffff814f5278 RDI: ffffeafff91a0000 [ 20.895180] RBP: ffff8801b75ef970 R08: 0000000000033a60 R09: 0000000000000001 [ 20.902440] R10: ffff8801b69ae000 R11: 0000000000000001 R12: ffff8801b75efc08 [ 20.909703] R13: ffffeafff91a0020 R14: ffffeafff91a0000 R15: 0000000000000001 [ 20.916969] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.925187] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.931066] CR2: ffffeafff91a0020 CR3: 00000001cb644000 CR4: 00000000001606f0 [ 20.938465] Stack: [ 20.940608] ffffeafff91a0020 ffff8801b75efc08 ffff8801ca88c800 ffffeafff91a0000 [ 20.948674] ffff8801cb2fd948 ffff8801b75ef9c8 ffffffff8154c20f ffff8801b75efc18 [ 20.956774] ffff8801b75efc10 ffff8801b75efc88 00003ffe468001e0 00000001ca88c000 [ 20.964975] Call Trace: [ 20.967561] [] zap_huge_pmd+0x16f/0x860 [ 20.973272] [] unmap_page_range+0x12ad/0x1730 [ 20.979419] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 20.985732] [] unmap_single_vma+0x101/0x260 [ 20.991694] [] unmap_vmas+0x102/0x1d0 [ 20.997235] [] exit_mmap+0x214/0x3f0 [ 21.002722] [] ? SyS_munmap+0xa0/0xa0 [ 21.008252] [] ? up_write+0x1a/0x60 [ 21.013695] [] mmput+0xf3/0x2d0 [ 21.018684] [] do_exit+0x906/0x27b0 [ 21.023962] [] ? release_task.part.19+0x1210/0x1210 [ 21.030712] [] ? up_write+0x1a/0x60 [ 21.035991] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.042383] [] ? mprotect_fixup+0x930/0x930 [ 21.048513] [] do_group_exit+0x111/0x340 [ 21.054361] [] ? do_group_exit+0x340/0x340 [ 21.060238] [] SyS_exit_group+0x1d/0x20 [ 21.065876] [] do_syscall_64+0x1a6/0x490 [ 21.071578] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.078493] 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 [ 21.106600] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.113083] RSP [ 21.116700] CR2: ffffeafff91a0020 [ 21.120151] ---[ end trace 5759d0c00eb409a5 ]--- [ 21.124896] Kernel panic - not syncing: Fatal exception [ 21.130812] Dumping ftrace buffer: [ 21.134387] (ftrace buffer empty) [ 21.138086] Kernel Offset: disabled [ 21.141705] Rebooting in 86400 seconds..