[....] 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[ 12.537542] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.659438] random: sshd: uninitialized urandom read (32 bytes read) [ 15.880211] random: sshd: uninitialized urandom read (32 bytes read) [ 16.409097] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 22.068705] urandom_read: 1 callbacks suppressed [ 22.068708] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.156790] BUG: unable to handle kernel paging request at ffffeafff9060020 [ 22.164355] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.170595] PGD 0 [ 22.172650] [ 22.174273] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.178741] Dumping ftrace buffer: [ 22.182257] (ftrace buffer empty) [ 22.185954] Modules linked in: [ 22.189245] CPU: 1 PID: 3767 Comm: syz-executor290 Not tainted 4.9.122-g54068d6 #26 [ 22.197051] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.206396] task: ffff8801bc12b000 task.stack: ffff8801bc280000 [ 22.212439] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.221116] RSP: 0018:ffff8801bc287948 EFLAGS: 00010246 [ 22.226537] RAX: dffffc0000000000 RBX: ffffeafff9060000 RCX: 0000000000000000 [ 22.233873] RDX: 1ffffd5fff20c004 RSI: ffffffff814f5918 RDI: ffffeafff9060000 [ 22.241245] RBP: ffff8801bc287970 R08: 00000000000339e0 R09: 0000000000000001 [ 22.248603] R10: ffff8801bc12b000 R11: 0000000000000001 R12: ffff8801bc287c08 [ 22.255859] R13: ffffeafff9060020 R14: ffffeafff9060000 R15: 0000000000000001 [ 22.263184] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.271495] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.277405] CR2: ffffeafff9060020 CR3: 00000001c8142000 CR4: 00000000001606f0 [ 22.284746] Stack: [ 22.286878] ffffeafff9060020 ffff8801bc287c08 ffff8801bef6d800 ffffeafff9060000 [ 22.294863] ffff8801bc2ff688 ffff8801bc2879c8 ffffffff8154cb8f ffff8801bc287c18 [ 22.302963] ffff8801bc287c10 ffff8801bc287c88 00003ffe418001e0 00000001bef6d000 [ 22.310947] Call Trace: [ 22.313510] [] zap_huge_pmd+0x16f/0x860 [ 22.319115] [] unmap_page_range+0x12ad/0x1730 [ 22.325238] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.331542] [] unmap_single_vma+0x101/0x260 [ 22.337485] [] unmap_vmas+0x102/0x1d0 [ 22.343016] [] exit_mmap+0x214/0x3f0 [ 22.348353] [] ? SyS_munmap+0xa0/0xa0 [ 22.353787] [] ? up_write+0x1a/0x60 [ 22.359043] [] mmput+0xf3/0x2d0 [ 22.363964] [] do_exit+0x906/0x27b0 [ 22.369314] [] ? release_task.part.19+0x1210/0x1210 [ 22.375960] [] ? up_write+0x1a/0x60 [ 22.381262] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.387470] [] ? mprotect_fixup+0x930/0x930 [ 22.393422] [] do_group_exit+0x111/0x340 [ 22.399118] [] ? do_group_exit+0x340/0x340 [ 22.404976] [] SyS_exit_group+0x1d/0x20 [ 22.410576] [] do_syscall_64+0x1a6/0x490 [ 22.416263] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.423154] 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 [ 22.450176] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.456526] RSP [ 22.460263] CR2: ffffeafff9060020 [ 22.463697] ---[ end trace 5e1b5c2d31fc90d4 ]--- [ 22.468427] Kernel panic - not syncing: Fatal exception [ 22.474047] Dumping ftrace buffer: [ 22.477568] (ftrace buffer empty) [ 22.481252] Kernel Offset: disabled [ 22.484855] Rebooting in 86400 seconds..