[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.175191] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.711069] random: sshd: uninitialized urandom read (32 bytes read) [ 13.886736] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.706579] random: sshd: uninitialized urandom read (32 bytes read) [ 29.239589] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 34.881776] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.962942] BUG: unable to handle kernel paging request at ffffeafff9148020 [ 34.970302] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.976543] PGD 0 [ 34.978487] [ 34.980112] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.984583] Dumping ftrace buffer: [ 34.988108] (ftrace buffer empty) [ 34.991852] Modules linked in: [ 34.995144] CPU: 1 PID: 3806 Comm: syz-executor242 Not tainted 4.9.122-g54068d6 #26 [ 35.003072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.012405] task: ffff8801b7220000 task.stack: ffff8801d9758000 [ 35.018445] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.027116] RSP: 0018:ffff8801d975f948 EFLAGS: 00010246 [ 35.032599] RAX: dffffc0000000000 RBX: ffffeafff9148000 RCX: 0000000000000000 [ 35.039857] RDX: 1ffffd5fff229004 RSI: ffffffff814f5918 RDI: ffffeafff9148000 [ 35.047222] RBP: ffff8801d975f970 R08: 00000000000340e0 R09: 0000000000000001 [ 35.054484] R10: ffff8801b7220000 R11: 0000000000000001 R12: ffff8801d975fc08 [ 35.061743] R13: ffffeafff9148020 R14: ffffeafff9148000 R15: 0000000000000001 [ 35.068990] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.077193] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.083051] CR2: ffffeafff9148020 CR3: 00000001c7c4c000 CR4: 00000000001606f0 [ 35.090302] Stack: [ 35.092427] ffffeafff9148020 ffff8801d975fc08 ffff8801c6d75800 ffffeafff9148000 [ 35.100433] ffff8801b8e1f8f0 ffff8801d975f9c8 ffffffff8154cb8f ffff8801d975fc18 [ 35.108512] ffff8801d975fc10 ffff8801d975fc88 00003ffe452001e0 00000001c6d75000 [ 35.116574] Call Trace: [ 35.119147] [] zap_huge_pmd+0x16f/0x860 [ 35.124753] [] unmap_page_range+0x12ad/0x1730 [ 35.130880] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.137175] [] unmap_single_vma+0x101/0x260 [ 35.143120] [] unmap_vmas+0x102/0x1d0 [ 35.148557] [] exit_mmap+0x214/0x3f0 [ 35.153909] [] ? SyS_munmap+0xa0/0xa0 [ 35.159344] [] ? up_write+0x1a/0x60 [ 35.164623] [] mmput+0xf3/0x2d0 [ 35.169537] [] do_exit+0x906/0x27b0 [ 35.174894] [] ? release_task.part.19+0x1210/0x1210 [ 35.181538] [] ? up_write+0x1a/0x60 [ 35.186792] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.192909] [] ? do_schedule_next_timer+0x500/0x500 [ 35.199550] [] ? mprotect_fixup+0x930/0x930 [ 35.205499] [] do_group_exit+0x111/0x340 [ 35.211197] [] ? do_group_exit+0x340/0x340 [ 35.217058] [] SyS_exit_group+0x1d/0x20 [ 35.222656] [] do_syscall_64+0x1a6/0x490 [ 35.228344] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.235258] 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 [ 35.262334] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.268829] RSP [ 35.272434] CR2: ffffeafff9148020 [ 35.275864] ---[ end trace 9030e9a24b931782 ]--- [ 35.280591] Kernel panic - not syncing: Fatal exception [ 35.286245] Dumping ftrace buffer: [ 35.289821] (ftrace buffer empty) [ 35.293513] Kernel Offset: disabled [ 35.297116] Rebooting in 86400 seconds..