[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.149774] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.485954] random: sshd: uninitialized urandom read (32 bytes read) [ 18.959065] random: sshd: uninitialized urandom read (32 bytes read) [ 19.454358] random: sshd: uninitialized urandom read (32 bytes read) [ 30.427972] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 36.039648] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.119774] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 36.127117] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.133367] PGD 0 [ 36.135314] [ 36.136937] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.141508] Dumping ftrace buffer: [ 36.145023] (ftrace buffer empty) [ 36.148707] Modules linked in: [ 36.151994] CPU: 0 PID: 3804 Comm: syz-executor053 Not tainted 4.9.120-gf85543b #24 [ 36.159800] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.169199] task: ffff8801b90d8000 task.stack: ffff8801d9bd0000 [ 36.175348] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.184159] RSP: 0018:ffff8801d9bd7948 EFLAGS: 00010246 [ 36.189588] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 36.196836] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5128 RDI: ffffeafff90e8000 [ 36.204083] RBP: ffff8801d9bd7970 R08: 0000000000033a80 R09: 0000000000000001 [ 36.211335] R10: ffff8801b90d8000 R11: 0000000000000001 R12: ffff8801d9bd7c08 [ 36.218685] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 36.225944] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.234157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.240073] CR2: ffffeafff90e8020 CR3: 00000001b625c000 CR4: 00000000001606f0 [ 36.247330] Stack: [ 36.249461] ffffeafff90e8020 ffff8801d9bd7c08 ffff8801b67da800 ffffeafff90e8000 [ 36.257444] ffff8801c90a6bb0 ffff8801d9bd79c8 ffffffff8154bfcf ffff8801d9bd7c18 [ 36.265445] ffff8801d9bd7c10 ffff8801d9bd7c88 00003ffe43a001e0 00000001b67da000 [ 36.273425] Call Trace: [ 36.275999] [] zap_huge_pmd+0x16f/0x860 [ 36.281612] [] unmap_page_range+0x12ad/0x1730 [ 36.287742] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 36.294161] [] unmap_single_vma+0x101/0x260 [ 36.300154] [] unmap_vmas+0x102/0x1d0 [ 36.305632] [] exit_mmap+0x214/0x3f0 [ 36.310998] [] ? SyS_munmap+0xa0/0xa0 [ 36.316431] [] ? up_write+0x1a/0x60 [ 36.321685] [] mmput+0xf3/0x2d0 [ 36.326592] [] do_exit+0x906/0x27b0 [ 36.331844] [] ? release_task.part.19+0x1210/0x1210 [ 36.338493] [] ? up_write+0x1a/0x60 [ 36.343749] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.349873] [] ? mprotect_fixup+0x930/0x930 [ 36.355824] [] do_group_exit+0x111/0x340 [ 36.361513] [] ? do_group_exit+0x340/0x340 [ 36.367385] [] SyS_exit_group+0x1d/0x20 [ 36.372987] [] do_syscall_64+0x1a6/0x490 [ 36.378678] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.385575] 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 [ 36.412826] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.419172] RSP [ 36.422773] CR2: ffffeafff90e8020 [ 36.426209] ---[ end trace 9490727000accf23 ]--- [ 36.430951] Kernel panic - not syncing: Fatal exception [ 36.436619] Dumping ftrace buffer: [ 36.440138] (ftrace buffer empty) [ 36.443824] Kernel Offset: disabled [ 36.447437] Rebooting in 86400 seconds..