[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.317335] 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: [ 15.834133] random: sshd: uninitialized urandom read (32 bytes read) [ 16.138059] random: sshd: uninitialized urandom read (32 bytes read) [ 16.674819] random: sshd: uninitialized urandom read (32 bytes read) [ 27.303393] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 32.942067] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.026595] BUG: unable to handle kernel paging request at ffffeafff9168020 [ 33.033944] IP: [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 33.040193] PGD 0 [ 33.042139] [ 33.043760] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.048229] Dumping ftrace buffer: [ 33.051741] (ftrace buffer empty) [ 33.055426] Modules linked in: [ 33.058716] CPU: 1 PID: 3798 Comm: syz-executor387 Not tainted 4.9.121-g681e57b #77 [ 33.066480] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.075811] task: ffff8801d94a8000 task.stack: ffff8801d94c8000 [ 33.081838] RIP: 0010:[<ffffffff814f5297>] [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 33.090512] RSP: 0018:ffff8801d94cf948 EFLAGS: 00010246 [ 33.095942] RAX: dffffc0000000000 RBX: ffffeafff9168000 RCX: 0000000000000000 [ 33.103183] RDX: 1ffffd5fff22d004 RSI: ffffffff814f5278 RDI: ffffeafff9168000 [ 33.110428] RBP: ffff8801d94cf970 R08: 00000000000342c0 R09: 0000000000000001 [ 33.117672] R10: ffff8801d94a8000 R11: 0000000000000001 R12: ffff8801d94cfc08 [ 33.124965] R13: ffffeafff9168020 R14: ffffeafff9168000 R15: 0000000000000001 [ 33.132223] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.140422] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.146298] CR2: ffffeafff9168020 CR3: 00000001c06d4000 CR4: 00000000001606f0 [ 33.153558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.160802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.168043] Stack: [ 33.170167] ffffeafff9168020 ffff8801d94cfc08 ffff8801bf7dd800 ffffeafff9168000 [ 33.178165] ffff8801be1ef058 ffff8801d94cf9c8 ffffffff8154c20f ffff8801d94cfc18 [ 33.186381] ffff8801d94cfc10 ffff8801d94cfc88 00003ffe45a001e0 00000001bf7dd000 [ 33.194401] Call Trace: [ 33.196967] [<ffffffff8154c20f>] zap_huge_pmd+0x16f/0x860 [ 33.202571] [<ffffffff814ca95d>] unmap_page_range+0x12ad/0x1730 [ 33.208697] [<ffffffff814c96b0>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.214996] [<ffffffff814caee1>] unmap_single_vma+0x101/0x260 [ 33.220949] [<ffffffff814cb822>] unmap_vmas+0x102/0x1d0 [ 33.226420] [<ffffffff814e4214>] exit_mmap+0x214/0x3f0 [ 33.231771] [<ffffffff814e4000>] ? SyS_munmap+0xa0/0xa0 [ 33.237236] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 33.242490] [<ffffffff8112d6f3>] mmput+0xf3/0x2d0 [ 33.247417] [<ffffffff81142c26>] do_exit+0x906/0x27b0 [ 33.252679] [<ffffffff81142320>] ? release_task.part.19+0x1210/0x1210 [ 33.259321] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 33.264595] [<ffffffff814ec78d>] ? do_mprotect_pkey+0x71d/0x890 [ 33.270857] [<ffffffff814ec070>] ? mprotect_fixup+0x930/0x930 [ 33.276807] [<ffffffff81148de1>] do_group_exit+0x111/0x340 [ 33.282497] [<ffffffff81149010>] ? do_group_exit+0x340/0x340 [ 33.288368] [<ffffffff8114902d>] SyS_exit_group+0x1d/0x20 [ 33.293972] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 33.299659] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.306558] 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 [ 33.333640] RIP [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 33.340012] RSP <ffff8801d94cf948> [ 33.343616] CR2: ffffeafff9168020 [ 33.347045] ---[ end trace f15f888c7d919df0 ]--- [ 33.351775] Kernel panic - not syncing: Fatal exception [ 33.357462] Dumping ftrace buffer: [ 33.361051] (ftrace buffer empty) [ 33.364742] Kernel Offset: disabled [ 33.368343] Rebooting in 86400 seconds..