[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.225397] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.615140] random: sshd: uninitialized urandom read (32 bytes read) [ 23.038196] random: sshd: uninitialized urandom read (32 bytes read) [ 23.561321] random: sshd: uninitialized urandom read (32 bytes read) [ 23.709720] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 29.379956] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.473086] BUG: unable to handle kernel paging request at ffffeafff9130020 [ 29.480573] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.486836] PGD 0 [ 29.488792] [ 29.490430] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.495037] Dumping ftrace buffer: [ 29.498596] (ftrace buffer empty) [ 29.502403] Modules linked in: [ 29.505720] CPU: 0 PID: 3799 Comm: syz-executor215 Not tainted 4.9.120-gf85543b #24 [ 29.513493] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.522924] task: ffff8801b7fd9800 task.stack: ffff8801b64b0000 [ 29.528968] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.537661] RSP: 0018:ffff8801b64b7948 EFLAGS: 00010246 [ 29.543216] RAX: dffffc0000000000 RBX: ffffeafff9130000 RCX: 0000000000000000 [ 29.550471] RDX: 1ffffd5fff226004 RSI: ffffffff814f5128 RDI: ffffeafff9130000 [ 29.557725] RBP: ffff8801b64b7970 R08: 0000000000033f40 R09: 0000000000000001 [ 29.564976] R10: ffff8801b7fd9800 R11: 0000000000000001 R12: ffff8801b64b7c08 [ 29.572314] R13: ffffeafff9130020 R14: ffffeafff9130000 R15: 0000000000000001 [ 29.579749] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.587956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.593822] CR2: ffffeafff9130020 CR3: 00000001c8168000 CR4: 00000000001606f0 [ 29.601104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.608360] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.615742] Stack: [ 29.617875] ffffeafff9130020 ffff8801b64b7c08 ffff8801c3e89800 ffffeafff9130000 [ 29.626034] ffff8801b748b3c8 ffff8801b64b79c8 ffffffff8154bfcf ffff8801b64b7c18 [ 29.634056] ffff8801b64b7c10 ffff8801b64b7c88 00003ffe44c001e0 00000001c3e89000 [ 29.642100] Call Trace: [ 29.644674] [] zap_huge_pmd+0x16f/0x860 [ 29.650283] [] unmap_page_range+0x12ad/0x1730 [ 29.656425] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.662727] [] unmap_single_vma+0x101/0x260 [ 29.668678] [] unmap_vmas+0x102/0x1d0 [ 29.674110] [] exit_mmap+0x214/0x3f0 [ 29.679456] [] ? SyS_munmap+0xa0/0xa0 [ 29.684891] [] ? up_write+0x1a/0x60 [ 29.690151] [] mmput+0xf3/0x2d0 [ 29.695065] [] do_exit+0x906/0x27b0 [ 29.700323] [] ? release_task.part.19+0x1210/0x1210 [ 29.706979] [] ? up_write+0x1a/0x60 [ 29.712236] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.718365] [] ? mprotect_fixup+0x930/0x930 [ 29.724336] [] do_group_exit+0x111/0x340 [ 29.730028] [] ? do_group_exit+0x340/0x340 [ 29.736041] [] SyS_exit_group+0x1d/0x20 [ 29.741744] [] do_syscall_64+0x1a6/0x490 [ 29.747454] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.754359] 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 [ 29.782139] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.788482] RSP [ 29.792085] CR2: ffffeafff9130020 [ 29.795521] ---[ end trace 5ad7a45065191fbd ]--- [ 29.800418] Kernel panic - not syncing: Fatal exception [ 29.806239] Dumping ftrace buffer: [ 29.809768] (ftrace buffer empty) [ 29.813459] Kernel Offset: disabled [ 29.817064] Rebooting in 86400 seconds..