[....] 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[ 16.658777] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.278614] random: sshd: uninitialized urandom read (32 bytes read) [ 18.536393] random: sshd: uninitialized urandom read (32 bytes read) [ 19.056374] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 24.698249] urandom_read: 1 callbacks suppressed [ 24.698252] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.781062] BUG: unable to handle kernel paging request at ffffeafff9160020 [ 24.788412] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.794676] PGD 0 [ 24.796625] [ 24.798248] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.802714] Dumping ftrace buffer: [ 24.806226] (ftrace buffer empty) [ 24.810081] Modules linked in: [ 24.813408] CPU: 0 PID: 3795 Comm: syz-executor040 Not tainted 4.9.122-g54068d6 #26 [ 24.821178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.830507] task: ffff8801b73ac800 task.stack: ffff8801b5bd0000 [ 24.836551] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.845223] RSP: 0018:ffff8801b5bd7948 EFLAGS: 00010246 [ 24.850644] RAX: dffffc0000000000 RBX: ffffeafff9160000 RCX: 0000000000000000 [ 24.858186] RDX: 1ffffd5fff22c004 RSI: ffffffff814f5918 RDI: ffffeafff9160000 [ 24.865429] RBP: ffff8801b5bd7970 R08: 0000000000033860 R09: 0000000000000001 [ 24.872674] R10: ffff8801b73ac800 R11: 0000000000000001 R12: ffff8801b5bd7c08 [ 24.879916] R13: ffffeafff9160020 R14: ffffeafff9160000 R15: 0000000000000001 [ 24.887176] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.895392] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.901353] CR2: ffffeafff9160020 CR3: 00000001b8d77000 CR4: 00000000001606f0 [ 24.908599] Stack: [ 24.910722] ffffeafff9160020 ffff8801b5bd7c08 ffff8801c847b800 ffffeafff9160000 [ 24.918736] ffff8801b545f268 ffff8801b5bd79c8 ffffffff8154cb8f ffff8801b5bd7c18 [ 24.926743] ffff8801b5bd7c10 ffff8801b5bd7c88 00003ffe458001e0 00000001c847b000 [ 24.934722] Call Trace: [ 24.937287] [] zap_huge_pmd+0x16f/0x860 [ 24.942886] [] unmap_page_range+0x12ad/0x1730 [ 24.949014] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.955304] [] unmap_single_vma+0x101/0x260 [ 24.961270] [] unmap_vmas+0x102/0x1d0 [ 24.966697] [] exit_mmap+0x214/0x3f0 [ 24.972035] [] ? SyS_munmap+0xa0/0xa0 [ 24.977460] [] ? up_write+0x1a/0x60 [ 24.982725] [] mmput+0xf3/0x2d0 [ 24.987639] [] do_exit+0x906/0x27b0 [ 24.992891] [] ? release_task.part.19+0x1210/0x1210 [ 24.999528] [] ? up_write+0x1a/0x60 [ 25.004777] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.010896] [] ? mprotect_fixup+0x930/0x930 [ 25.016842] [] do_group_exit+0x111/0x340 [ 25.022525] [] ? do_group_exit+0x340/0x340 [ 25.028399] [] SyS_exit_group+0x1d/0x20 [ 25.034005] [] do_syscall_64+0x1a6/0x490 [ 25.039694] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.046594] 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 [ 25.073444] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.079786] RSP [ 25.083384] CR2: ffffeafff9160020 [ 25.086811] ---[ end trace dba93c2cae175545 ]--- [ 25.091538] Kernel panic - not syncing: Fatal exception [ 25.097167] Dumping ftrace buffer: [ 25.100687] (ftrace buffer empty) [ 25.104370] Kernel Offset: disabled [ 25.107969] Rebooting in 86400 seconds..