[....] 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[ 13.377573] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.691995] random: sshd: uninitialized urandom read (32 bytes read) [ 16.894222] random: sshd: uninitialized urandom read (32 bytes read) [ 17.434183] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 23.241068] urandom_read: 1 callbacks suppressed [ 23.241071] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.335274] BUG: unable to handle kernel paging request at ffffeafff9078020 [ 23.342626] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.348872] PGD 0 [ 23.350816] [ 23.352436] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.356905] Dumping ftrace buffer: [ 23.360416] (ftrace buffer empty) [ 23.364101] Modules linked in: [ 23.367392] CPU: 1 PID: 3779 Comm: syz-executor481 Not tainted 4.9.120-gf85543b #76 [ 23.375155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.384487] task: ffff8801bb286000 task.stack: ffff8801baef0000 [ 23.390564] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.399244] RSP: 0018:ffff8801baef7948 EFLAGS: 00010246 [ 23.404666] RAX: dffffc0000000000 RBX: ffffeafff9078000 RCX: 0000000000000000 [ 23.411929] RDX: 1ffffd5fff20f004 RSI: ffffffff814f5128 RDI: ffffeafff9078000 [ 23.419191] RBP: ffff8801baef7970 R08: 0000000000033ee0 R09: 0000000000000001 [ 23.426437] R10: ffff8801bb286000 R11: 0000000000000001 R12: ffff8801baef7c08 [ 23.433679] R13: ffffeafff9078020 R14: ffffeafff9078000 R15: 0000000000000001 [ 23.440944] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 23.449161] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.455017] CR2: ffffeafff9078020 CR3: 00000001c9aa2000 CR4: 00000000001606f0 [ 23.462278] Stack: [ 23.464405] ffffeafff9078020 ffff8801baef7c08 ffff8801c9a08800 ffffeafff9078000 [ 23.472396] ffff8801baf244d0 ffff8801baef79c8 ffffffff8154bfcf ffff8801baef7c18 [ 23.480378] ffff8801baef7c10 ffff8801baef7c88 00003ffe41e001e0 00000001c9a08000 [ 23.488359] Call Trace: [ 23.490921] [] zap_huge_pmd+0x16f/0x860 [ 23.496522] [] unmap_page_range+0x12ad/0x1730 [ 23.502644] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 23.508939] [] unmap_single_vma+0x101/0x260 [ 23.514893] [] unmap_vmas+0x102/0x1d0 [ 23.520354] [] exit_mmap+0x214/0x3f0 [ 23.520361] [] ? SyS_munmap+0xa0/0xa0 [ 23.520369] [] ? up_write+0x1a/0x60 [ 23.520382] [] mmput+0xf3/0x2d0 [ 23.520389] [] do_exit+0x906/0x27b0 [ 23.520397] [] ? release_task.part.19+0x1210/0x1210 [ 23.520403] [] ? up_write+0x1a/0x60 [ 23.520410] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.520417] [] ? mprotect_fixup+0x930/0x930 [ 23.520425] [] do_group_exit+0x111/0x340 [ 23.520432] [] ? do_group_exit+0x340/0x340 [ 23.520440] [] SyS_exit_group+0x1d/0x20 [ 23.520448] [] do_syscall_64+0x1a6/0x490 [ 23.520457] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.520575] 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 [ 23.520584] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.520587] RSP [ 23.520589] CR2: ffffeafff9078020 [ 23.520596] ---[ end trace be0c8b5ad3223971 ]--- [ 23.520601] Kernel panic - not syncing: Fatal exception [ 23.525999] Dumping ftrace buffer: [ 23.526002] (ftrace buffer empty) [ 23.526004] Kernel Offset: disabled [ 23.653495] Rebooting in 86400 seconds..