[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.567549] 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: [ 18.732857] random: sshd: uninitialized urandom read (32 bytes read) [ 19.010652] random: sshd: uninitialized urandom read (32 bytes read) [ 19.496385] random: sshd: uninitialized urandom read (32 bytes read) [ 24.861506] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 30.466510] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.556930] BUG: unable to handle kernel paging request at ffffeafff8f68020 [ 30.564314] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 30.570572] PGD 0 [ 30.572523] [ 30.574143] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.578654] Dumping ftrace buffer: [ 30.582171] (ftrace buffer empty) [ 30.585917] Modules linked in: [ 30.589280] CPU: 1 PID: 3797 Comm: syz-executor511 Not tainted 4.9.122-g54068d6 #26 [ 30.597093] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.606434] task: ffff8801b8363000 task.stack: ffff8801d9558000 [ 30.612471] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 30.621249] RSP: 0018:ffff8801d955f948 EFLAGS: 00010246 [ 30.626718] RAX: dffffc0000000000 RBX: ffffeafff8f68000 RCX: ffffea0006d58000 [ 30.633968] RDX: 1ffffd5fff1ed004 RSI: ffffffff814f5918 RDI: ffffeafff8f68000 [ 30.641211] RBP: ffff8801d955f970 R08: 0000000000033520 R09: 0000000000000001 [ 30.648454] R10: ffff8801b8363000 R11: 0000000000000001 R12: ffff8801d955fc08 [ 30.655696] R13: ffffeafff8f68020 R14: ffffeafff8f68000 R15: 0000000000000001 [ 30.662943] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.671142] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.676999] CR2: ffffeafff8f68020 CR3: 00000001c9d8e000 CR4: 00000000001606f0 [ 30.684291] Stack: [ 30.686424] ffffeafff8f68020 ffff8801d955fc08 ffff8801c9789800 ffffeafff8f68000 [ 30.694417] ffff8801c97d4108 ffff8801d955f9c8 ffffffff8154cb8f ffff8801d955fc18 [ 30.702407] ffff8801d955fc10 ffff8801d955fc88 00003ffe3da001e0 00000001c9789000 [ 30.710382] Call Trace: [ 30.712948] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 30.718547] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 30.724669] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 30.730960] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 30.736918] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 30.742354] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 30.747691] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 30.753116] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 30.758366] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 30.763272] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 30.768521] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 30.775160] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 30.780412] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 30.786533] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 30.792559] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 30.798297] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 30.804205] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 30.809811] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 30.815500] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.822406] 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 [ 30.849357] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 30.855683] RSP <ffff8801d955f948> [ 30.859287] CR2: ffffeafff8f68020 [ 30.862714] ---[ end trace 9a7e5ad2335b184e ]--- [ 30.867444] Kernel panic - not syncing: Fatal exception [ 30.873091] Dumping ftrace buffer: [ 30.876615] (ftrace buffer empty) [ 30.880299] Kernel Offset: disabled [ 30.883900] Rebooting in 86400 seconds..