[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.709080] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.435914] random: sshd: uninitialized urandom read (32 bytes read) [ 16.641020] random: sshd: uninitialized urandom read (32 bytes read) [ 17.123003] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 22.772669] urandom_read: 1 callbacks suppressed [ 22.772672] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.853938] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 22.861441] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 22.867746] PGD 0 [ 22.869699] [ 22.871320] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.875801] Dumping ftrace buffer: [ 22.879399] (ftrace buffer empty) [ 22.883142] Modules linked in: [ 22.886516] CPU: 1 PID: 3788 Comm: syz-executor121 Not tainted 4.9.122-g54068d6 #26 [ 22.894353] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.903690] task: ffff8801b9a4e000 task.stack: ffff8801b7118000 [ 22.909746] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 22.918425] RSP: 0018:ffff8801b711f948 EFLAGS: 00010246 [ 22.923848] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 22.931101] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 22.938349] RBP: ffff8801b711f970 R08: 0000000000033720 R09: 0000000000000001 [ 22.945646] R10: ffff8801b9a4e000 R11: 0000000000000001 R12: ffff8801b711fc08 [ 22.952894] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 22.960146] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.968348] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.974203] CR2: ffffeafff90e8020 CR3: 00000001bc2ae000 CR4: 00000000001606f0 [ 22.981545] Stack: [ 22.983741] ffffeafff90e8020 ffff8801b711fc08 ffff8801bc011800 ffffeafff90e8000 [ 22.991828] ffff8801b7b82948 ffff8801b711f9c8 ffffffff8154cb8f ffff8801b711fc18 [ 22.999814] ffff8801b711fc10 ffff8801b711fc88 00003ffe43a001e0 00000001bc011000 [ 23.007872] Call Trace: [ 23.010438] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 23.016039] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 23.022162] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 23.028459] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 23.034513] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 23.040010] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 23.045356] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 23.050940] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 23.056198] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 23.061108] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 23.066363] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 23.073007] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 23.078408] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 23.084534] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 23.090479] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 23.096284] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 23.102150] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 23.107752] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 23.113446] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.120345] 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 [ 23.147375] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 23.153805] RSP <ffff8801b711f948> [ 23.157414] CR2: ffffeafff90e8020 [ 23.160846] ---[ end trace 5c0d5c4ab6db9e8a ]--- [ 23.165582] Kernel panic - not syncing: Fatal exception [ 23.171295] Dumping ftrace buffer: [ 23.174816] (ftrace buffer empty) [ 23.178503] Kernel Offset: disabled [ 23.182110] Rebooting in 86400 seconds..