[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.813870] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.009224] random: sshd: uninitialized urandom read (32 bytes read) [ 16.263815] random: sshd: uninitialized urandom read (32 bytes read) [ 16.738689] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 22.481870] urandom_read: 1 callbacks suppressed [ 22.481874] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.566596] BUG: unable to handle kernel paging request at ffffeafff9160020 [ 22.573962] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.580217] PGD 0 [ 22.582206] [ 22.583906] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.588424] Dumping ftrace buffer: [ 22.591945] (ftrace buffer empty) [ 22.595634] Modules linked in: [ 22.598937] CPU: 0 PID: 3794 Comm: syz-executor515 Not tainted 4.9.122-g54068d6 #78 [ 22.606713] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.616162] task: ffff8801b7880000 task.stack: ffff8801b6f18000 [ 22.622658] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.631357] RSP: 0018:ffff8801b6f1f948 EFLAGS: 00010246 [ 22.636782] RAX: dffffc0000000000 RBX: ffffeafff9160000 RCX: ffffea00071b0000 [ 22.644030] RDX: 1ffffd5fff22c004 RSI: ffffffff814f5918 RDI: ffffeafff9160000 [ 22.651292] RBP: ffff8801b6f1f970 R08: 0000000000033dc0 R09: 0000000000000001 [ 22.658537] R10: ffff8801b7880000 R11: 0000000000000001 R12: ffff8801b6f1fc08 [ 22.665993] R13: ffffeafff9160020 R14: ffffeafff9160000 R15: 0000000000000001 [ 22.673355] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 22.681558] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.687587] CR2: ffffeafff9160020 CR3: 00000001c98a0000 CR4: 00000000001606f0 [ 22.694843] Stack: [ 22.696975] ffffeafff9160020 ffff8801b6f1fc08 ffff8801c9822800 ffffeafff9160000 [ 22.705035] ffff8801b833cb00 ffff8801b6f1f9c8 ffffffff8154cb8f ffff8801b6f1fc18 [ 22.713139] ffff8801b6f1fc10 ffff8801b6f1fc88 00003ffe458001e0 00000001c9822000 [ 22.721186] Call Trace: [ 22.723753] [] zap_huge_pmd+0x16f/0x860 [ 22.729416] [] unmap_page_range+0x12ad/0x1730 [ 22.735587] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.741890] [] unmap_single_vma+0x101/0x260 [ 22.747845] [] unmap_vmas+0x102/0x1d0 [ 22.753270] [] exit_mmap+0x214/0x3f0 [ 22.758609] [] ? SyS_munmap+0xa0/0xa0 [ 22.764039] [] ? up_write+0x1a/0x60 [ 22.769356] [] mmput+0xf3/0x2d0 [ 22.774271] [] do_exit+0x906/0x27b0 [ 22.779527] [] ? release_task.part.19+0x1210/0x1210 [ 22.786173] [] ? up_write+0x1a/0x60 [ 22.791441] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.797571] [] ? mprotect_fixup+0x930/0x930 [ 22.803525] [] do_group_exit+0x111/0x340 [ 22.809217] [] ? do_group_exit+0x340/0x340 [ 22.815079] [] SyS_exit_group+0x1d/0x20 [ 22.820681] [] do_syscall_64+0x1a6/0x490 [ 22.826471] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.833475] 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 [ 22.861107] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.867487] RSP [ 22.871088] CR2: ffffeafff9160020 [ 22.874518] ---[ end trace d334cbe98bcaf17d ]--- [ 22.879261] Kernel panic - not syncing: Fatal exception [ 22.884905] Dumping ftrace buffer: [ 22.888425] (ftrace buffer empty) [ 22.892108] Kernel Offset: disabled [ 22.895711] Rebooting in 86400 seconds..