[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.239198] 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: [ 25.580269] random: sshd: uninitialized urandom read (32 bytes read) [ 25.964778] random: sshd: uninitialized urandom read (32 bytes read) [ 26.461374] random: sshd: uninitialized urandom read (32 bytes read) [ 26.596634] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 32.230155] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.308386] BUG: unable to handle kernel paging request at ffffeafff91b0020 [ 32.315880] IP: [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 32.322139] PGD 0 [ 32.324087] [ 32.325712] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.330181] Dumping ftrace buffer: [ 32.333696] (ftrace buffer empty) [ 32.337397] Modules linked in: [ 32.340696] CPU: 0 PID: 3802 Comm: syz-executor745 Not tainted 4.9.121-g681e57b #25 [ 32.348489] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.357954] task: ffff8801b7681800 task.stack: ffff8801b5cd0000 [ 32.363984] RIP: 0010:[<ffffffff814f5297>] [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 32.372664] RSP: 0018:ffff8801b5cd7948 EFLAGS: 00010246 [ 32.378087] RAX: dffffc0000000000 RBX: ffffeafff91b0000 RCX: 0000000000000000 [ 32.385551] RDX: 1ffffd5fff236004 RSI: ffffffff814f5278 RDI: ffffeafff91b0000 [ 32.392803] RBP: ffff8801b5cd7970 R08: 0000000000033c00 R09: 0000000000000001 [ 32.400116] R10: ffff8801b7681800 R11: 0000000000000001 R12: ffff8801b5cd7c08 [ 32.407369] R13: ffffeafff91b0020 R14: ffffeafff91b0000 R15: 0000000000000001 [ 32.414620] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.422827] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.428754] CR2: ffffeafff91b0020 CR3: 00000001cb1b2000 CR4: 00000000001606f0 [ 32.436008] Stack: [ 32.438141] ffffeafff91b0020 ffff8801b5cd7c08 ffff8801ca21c800 ffffeafff91b0000 [ 32.446152] ffff8801b99a8738 ffff8801b5cd79c8 ffffffff8154c20f ffff8801b5cd7c18 [ 32.454150] ffff8801b5cd7c10 ffff8801b5cd7c88 00003ffe46c001e0 00000001ca21c000 [ 32.462209] Call Trace: [ 32.464780] [<ffffffff8154c20f>] zap_huge_pmd+0x16f/0x860 [ 32.470385] [<ffffffff814ca95d>] unmap_page_range+0x12ad/0x1730 [ 32.476507] [<ffffffff814c96b0>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 32.482804] [<ffffffff814caee1>] unmap_single_vma+0x101/0x260 [ 32.488763] [<ffffffff814cb822>] unmap_vmas+0x102/0x1d0 [ 32.494205] [<ffffffff814e4214>] exit_mmap+0x214/0x3f0 [ 32.499545] [<ffffffff814e4000>] ? SyS_munmap+0xa0/0xa0 [ 32.504971] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 32.510226] [<ffffffff8112d6f3>] mmput+0xf3/0x2d0 [ 32.515135] [<ffffffff81142c26>] do_exit+0x906/0x27b0 [ 32.520396] [<ffffffff81142320>] ? release_task.part.19+0x1210/0x1210 [ 32.527043] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 32.532299] [<ffffffff814ec78d>] ? do_mprotect_pkey+0x71d/0x890 [ 32.538420] [<ffffffff814ec070>] ? mprotect_fixup+0x930/0x930 [ 32.544375] [<ffffffff81148de1>] do_group_exit+0x111/0x340 [ 32.550071] [<ffffffff81149010>] ? do_group_exit+0x340/0x340 [ 32.555938] [<ffffffff8114902d>] SyS_exit_group+0x1d/0x20 [ 32.561656] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 32.567351] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.574292] 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 [ 32.601416] RIP [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 32.607751] RSP <ffff8801b5cd7948> [ 32.611352] CR2: ffffeafff91b0020 [ 32.614789] ---[ end trace 5fab6fbbc78e3b84 ]--- [ 32.619524] Kernel panic - not syncing: Fatal exception [ 32.625147] Dumping ftrace buffer: [ 32.628670] (ftrace buffer empty) [ 32.632360] Kernel Offset: disabled [ 32.635965] Rebooting in 86400 seconds..