[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.457175] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.860796] random: sshd: uninitialized urandom read (32 bytes read) [ 17.117269] random: sshd: uninitialized urandom read (32 bytes read) [ 17.600589] random: sshd: uninitialized urandom read (32 bytes read) [ 25.060342] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 30.646484] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.725509] BUG: unable to handle kernel paging request at ffffeafff9118020 [ 30.732878] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.739136] PGD 0 [ 30.741087] [ 30.742706] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.747175] Dumping ftrace buffer: [ 30.750803] (ftrace buffer empty) [ 30.754497] Modules linked in: [ 30.757791] CPU: 0 PID: 3798 Comm: syz-executor440 Not tainted 4.9.122-g54068d6 #26 [ 30.765555] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.774971] task: ffff8801b7796000 task.stack: ffff8801b8498000 [ 30.781006] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.789681] RSP: 0018:ffff8801b849f948 EFLAGS: 00010246 [ 30.795103] RAX: dffffc0000000000 RBX: ffffeafff9118000 RCX: 0000000000000000 [ 30.802390] RDX: 1ffffd5fff223004 RSI: ffffffff814f5918 RDI: ffffeafff9118000 [ 30.809649] RBP: ffff8801b849f970 R08: 0000000000033d40 R09: 0000000000000001 [ 30.816896] R10: ffff8801b7796000 R11: 0000000000000001 R12: ffff8801b849fc08 [ 30.824142] R13: ffffeafff9118020 R14: ffffeafff9118000 R15: 0000000000000001 [ 30.831393] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.839592] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.845447] CR2: ffffeafff9118020 CR3: 00000001b8e11000 CR4: 00000000001606f0 [ 30.852691] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.860009] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.867263] Stack: [ 30.869389] ffffeafff9118020 ffff8801b849fc08 ffff8801c5ec0800 ffffeafff9118000 [ 30.877379] ffff8801b7002108 ffff8801b849f9c8 ffffffff8154cb8f ffff8801b849fc18 [ 30.885413] ffff8801b849fc10 ffff8801b849fc88 00003ffe446001e0 00000001c5ec0000 [ 30.893456] Call Trace: [ 30.896025] [] zap_huge_pmd+0x16f/0x860 [ 30.901641] [] unmap_page_range+0x12ad/0x1730 [ 30.907763] [] ? vm_normal_page_pmd+0x310/0x310 [ 30.914087] [] unmap_single_vma+0x101/0x260 [ 30.920090] [] unmap_vmas+0x102/0x1d0 [ 30.925521] [] exit_mmap+0x214/0x3f0 [ 30.930862] [] ? SyS_munmap+0xa0/0xa0 [ 30.936291] [] ? up_write+0x1a/0x60 [ 30.941546] [] mmput+0xf3/0x2d0 [ 30.946450] [] do_exit+0x906/0x27b0 [ 30.951705] [] ? release_task.part.19+0x1210/0x1210 [ 30.958362] [] ? up_write+0x1a/0x60 [ 30.963613] [] ? do_mprotect_pkey+0x71d/0x890 [ 30.969789] [] ? mprotect_fixup+0x930/0x930 [ 30.975863] [] do_group_exit+0x111/0x340 [ 30.981552] [] ? do_group_exit+0x340/0x340 [ 30.987491] [] SyS_exit_group+0x1d/0x20 [ 30.993099] [] do_syscall_64+0x1a6/0x490 [ 30.998789] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.005687] 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 [ 31.032633] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.038963] RSP [ 31.042566] CR2: ffffeafff9118020 [ 31.046001] ---[ end trace ff61cc337bfa7959 ]--- [ 31.050847] Kernel panic - not syncing: Fatal exception [ 31.056564] Dumping ftrace buffer: [ 31.060083] (ftrace buffer empty) [ 31.063771] Kernel Offset: disabled [ 31.067376] Rebooting in 86400 seconds..