[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.154560] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.187878] random: sshd: uninitialized urandom read (32 bytes read) [ 25.666483] random: sshd: uninitialized urandom read (32 bytes read) [ 26.164547] random: sshd: uninitialized urandom read (32 bytes read) [ 30.711783] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 36.187257] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.270633] BUG: unable to handle kernel paging request at ffffeafff9188020 [ 36.278224] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.284472] PGD 0 [ 36.286418] [ 36.288039] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.292508] Dumping ftrace buffer: [ 36.296018] (ftrace buffer empty) [ 36.299703] Modules linked in: [ 36.302993] CPU: 1 PID: 3809 Comm: syz-executor933 Not tainted 4.9.121-g681e57b #25 [ 36.310759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.320136] task: ffff8801b864b000 task.stack: ffff8801b6b00000 [ 36.326238] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.334972] RSP: 0018:ffff8801b6b07948 EFLAGS: 00010246 [ 36.340398] RAX: dffffc0000000000 RBX: ffffeafff9188000 RCX: 0000000000000000 [ 36.347858] RDX: 1ffffd5fff231004 RSI: ffffffff814f5278 RDI: ffffeafff9188000 [ 36.355114] RBP: ffff8801b6b07970 R08: 0000000000034160 R09: 0000000000000001 [ 36.362372] R10: ffff8801b864b000 R11: 0000000000000001 R12: ffff8801b6b07c08 [ 36.369618] R13: ffffeafff9188020 R14: ffffeafff9188000 R15: 0000000000000001 [ 36.376868] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.385074] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.391198] CR2: ffffeafff9188020 CR3: 00000001c1a5a000 CR4: 00000000001606f0 [ 36.398451] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.405707] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.412957] Stack: [ 36.415085] ffffeafff9188020 ffff8801b6b07c08 ffff8801c1ad9800 ffffeafff9188000 [ 36.423176] ffff8801c53290b0 ffff8801b6b079c8 ffffffff8154c20f ffff8801b6b07c18 [ 36.431158] ffff8801b6b07c10 ffff8801b6b07c88 00003ffe462001e0 00000001c1ad9000 [ 36.439196] Call Trace: [ 36.441776] [] zap_huge_pmd+0x16f/0x860 [ 36.447395] [] unmap_page_range+0x12ad/0x1730 [ 36.453539] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 36.459839] [] unmap_single_vma+0x101/0x260 [ 36.465837] [] unmap_vmas+0x102/0x1d0 [ 36.471277] [] exit_mmap+0x214/0x3f0 [ 36.476615] [] ? SyS_munmap+0xa0/0xa0 [ 36.482041] [] ? up_write+0x1a/0x60 [ 36.487343] [] mmput+0xf3/0x2d0 [ 36.492267] [] do_exit+0x906/0x27b0 [ 36.497520] [] ? release_task.part.19+0x1210/0x1210 [ 36.504274] [] ? up_write+0x1a/0x60 [ 36.509544] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.515771] [] ? mprotect_fixup+0x930/0x930 [ 36.521864] [] ? SyS_pwrite64+0xe8/0x170 [ 36.527561] [] do_group_exit+0x111/0x340 [ 36.533248] [] ? do_group_exit+0x340/0x340 [ 36.539180] [] SyS_exit_group+0x1d/0x20 [ 36.544787] [] do_syscall_64+0x1a6/0x490 [ 36.550538] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.557451] 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 [ 36.584704] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.591042] RSP [ 36.594643] CR2: ffffeafff9188020 [ 36.598074] ---[ end trace 14baab59af227b42 ]--- [ 36.602804] Kernel panic - not syncing: Fatal exception [ 36.608626] Dumping ftrace buffer: [ 36.612212] (ftrace buffer empty) [ 36.615911] Kernel Offset: disabled [ 36.619515] Rebooting in 86400 seconds..