[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.299616] 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: [ 17.488352] random: sshd: uninitialized urandom read (32 bytes read) [ 17.663804] random: sshd: uninitialized urandom read (32 bytes read) [ 18.126364] random: sshd: uninitialized urandom read (32 bytes read) [ 34.535546] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 40.223500] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.304375] BUG: unable to handle kernel paging request at ffffeafff9098020 [ 40.311731] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.318033] PGD 0 [ 40.319978] [ 40.321598] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.326068] Dumping ftrace buffer: [ 40.329585] (ftrace buffer empty) [ 40.333277] Modules linked in: [ 40.336572] CPU: 1 PID: 3795 Comm: syz-executor057 Not tainted 4.9.122-g54068d6 #26 [ 40.344340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.353669] task: ffff8801bb074800 task.stack: ffff8801b9668000 [ 40.359699] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.368383] RSP: 0018:ffff8801b966f948 EFLAGS: 00010246 [ 40.373810] RAX: dffffc0000000000 RBX: ffffeafff9098000 RCX: 0000000000000000 [ 40.381062] RDX: 1ffffd5fff213004 RSI: ffffffff814f5918 RDI: ffffeafff9098000 [ 40.388310] RBP: ffff8801b966f970 R08: 0000000000034060 R09: 0000000000000001 [ 40.395560] R10: ffff8801bb074800 R11: 0000000000000001 R12: ffff8801b966fc08 [ 40.402805] R13: ffffeafff9098020 R14: ffffeafff9098000 R15: 0000000000000001 [ 40.410050] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.418470] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.424334] CR2: ffffeafff9098020 CR3: 00000001cc591000 CR4: 00000000001606f0 [ 40.431587] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.438839] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.446091] Stack: [ 40.448217] ffffeafff9098020 ffff8801b966fc08 ffff8801c9c3f800 ffffeafff9098000 [ 40.456236] ffff8801ca624cb8 ffff8801b966f9c8 ffffffff8154cb8f ffff8801b966fc18 [ 40.464220] ffff8801b966fc10 ffff8801b966fc88 00003ffe426001e0 00000001c9c3f000 [ 40.472359] Call Trace: [ 40.475023] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 40.480625] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 40.486750] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 40.493052] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 40.499007] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 40.504550] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 40.509894] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 40.515331] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 40.520586] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 40.525620] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 40.530879] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 40.537522] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 40.542784] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 40.548911] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 40.554902] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 40.560907] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 40.566781] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 40.572389] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 40.578081] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.584982] 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 [ 40.611842] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.618173] RSP <ffff8801b966f948> [ 40.621778] CR2: ffffeafff9098020 [ 40.625207] ---[ end trace dc93bd44a8e8ce67 ]--- [ 40.629940] Kernel panic - not syncing: Fatal exception [ 40.635643] Dumping ftrace buffer: [ 40.639162] (ftrace buffer empty) [ 40.642851] Kernel Offset: disabled [ 40.646498] Rebooting in 86400 seconds..