[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.370975] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.904570] random: sshd: uninitialized urandom read (32 bytes read) [ 21.299236] random: sshd: uninitialized urandom read (32 bytes read) [ 21.864210] random: sshd: uninitialized urandom read (32 bytes read) [ 22.006487] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 27.598013] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.676311] BUG: unable to handle kernel paging request at ffffeafff9188020 [ 27.683953] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.690205] PGD 0 [ 27.692152] [ 27.693849] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.698328] Dumping ftrace buffer: [ 27.701847] (ftrace buffer empty) [ 27.705537] Modules linked in: [ 27.708824] CPU: 1 PID: 3801 Comm: syz-executor456 Not tainted 4.9.121-g681e57b #25 [ 27.716694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.726137] task: ffff8801b7dab000 task.stack: ffff8801b8d00000 [ 27.732173] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.740905] RSP: 0018:ffff8801b8d07948 EFLAGS: 00010246 [ 27.746344] RAX: dffffc0000000000 RBX: ffffeafff9188000 RCX: 0000000000000000 [ 27.753592] RDX: 1ffffd5fff231004 RSI: ffffffff814f5278 RDI: ffffeafff9188000 [ 27.760843] RBP: ffff8801b8d07970 R08: 00000000000340c0 R09: 0000000000000001 [ 27.768095] R10: ffff8801b7dab000 R11: 0000000000000001 R12: ffff8801b8d07c08 [ 27.775347] R13: ffffeafff9188020 R14: ffffeafff9188000 R15: 0000000000000001 [ 27.782643] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.790858] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.796766] CR2: ffffeafff9188020 CR3: 00000001cb692000 CR4: 00000000001606f0 [ 27.804208] Stack: [ 27.806339] ffffeafff9188020 ffff8801b8d07c08 ffff8801b8c95800 ffffeafff9188000 [ 27.814340] ffff8801b8a37cb8 ffff8801b8d079c8 ffffffff8154c20f ffff8801b8d07c18 [ 27.822365] ffff8801b8d07c10 ffff8801b8d07c88 00003ffe462001e0 00000001b8c95000 [ 27.830453] Call Trace: [ 27.833023] [] zap_huge_pmd+0x16f/0x860 [ 27.838806] [] unmap_page_range+0x12ad/0x1730 [ 27.844937] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.851322] [] unmap_single_vma+0x101/0x260 [ 27.857372] [] unmap_vmas+0x102/0x1d0 [ 27.862802] [] exit_mmap+0x214/0x3f0 [ 27.868149] [] ? SyS_munmap+0xa0/0xa0 [ 27.873685] [] ? up_write+0x1a/0x60 [ 27.878945] [] mmput+0xf3/0x2d0 [ 27.884020] [] do_exit+0x906/0x27b0 [ 27.889282] [] ? release_task.part.19+0x1210/0x1210 [ 27.895929] [] ? up_write+0x1a/0x60 [ 27.901402] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.907528] [] ? mprotect_fixup+0x930/0x930 [ 27.913479] [] do_group_exit+0x111/0x340 [ 27.919170] [] ? do_group_exit+0x340/0x340 [ 27.925037] [] SyS_exit_group+0x1d/0x20 [ 27.930646] [] do_syscall_64+0x1a6/0x490 [ 27.936367] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.943271] 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 [ 27.970540] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.976974] RSP [ 27.980575] CR2: ffffeafff9188020 [ 27.984009] ---[ end trace ff93145f0d3eda5c ]--- [ 27.988741] Kernel panic - not syncing: Fatal exception [ 27.994390] Dumping ftrace buffer: [ 27.998025] (ftrace buffer empty) [ 28.001721] Kernel Offset: disabled [ 28.005335] Rebooting in 86400 seconds..