[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.923942] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.525663] random: sshd: uninitialized urandom read (32 bytes read) [ 18.980460] random: sshd: uninitialized urandom read (32 bytes read) [ 19.499970] random: sshd: uninitialized urandom read (32 bytes read) [ 19.642347] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 25.485991] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.568031] BUG: unable to handle kernel paging request at ffffeafff8dc8020 [ 25.575399] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.581658] PGD 0 [ 25.583604] [ 25.585236] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.589710] Dumping ftrace buffer: [ 25.593225] (ftrace buffer empty) [ 25.596913] Modules linked in: [ 25.600202] CPU: 1 PID: 3798 Comm: syz-executor426 Not tainted 4.9.121-g681e57b #25 [ 25.607973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.617324] task: ffff8801b7414800 task.stack: ffff8801c8360000 [ 25.623364] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.632061] RSP: 0018:ffff8801c8367948 EFLAGS: 00010246 [ 25.637492] RAX: dffffc0000000000 RBX: ffffeafff8dc8000 RCX: 0000000000000000 [ 25.644745] RDX: 1ffffd5fff1b9004 RSI: ffffffff814f5278 RDI: ffffeafff8dc8000 [ 25.652014] RBP: ffff8801c8367970 R08: 0000000000033b80 R09: 0000000000000001 [ 25.659267] R10: ffff8801b7414800 R11: 0000000000000001 R12: ffff8801c8367c08 [ 25.666525] R13: ffffeafff8dc8020 R14: ffffeafff8dc8000 R15: 0000000000000001 [ 25.673780] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.681984] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.687840] CR2: ffffeafff8dc8020 CR3: 00000001bfe85000 CR4: 00000000001606f0 [ 25.695085] Stack: [ 25.697226] ffffeafff8dc8020 ffff8801c8367c08 ffff8801bfdc7800 ffffeafff8dc8000 [ 25.705255] ffff8801ca282630 ffff8801c83679c8 ffffffff8154c20f ffff8801c8367c18 [ 25.713262] ffff8801c8367c10 ffff8801c8367c88 00003ffe372001e0 00000001bfdc7000 [ 25.721259] Call Trace: [ 25.723825] [] zap_huge_pmd+0x16f/0x860 [ 25.729432] [] unmap_page_range+0x12ad/0x1730 [ 25.735559] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.741862] [] unmap_single_vma+0x101/0x260 [ 25.747813] [] unmap_vmas+0x102/0x1d0 [ 25.753251] [] exit_mmap+0x214/0x3f0 [ 25.758592] [] ? SyS_munmap+0xa0/0xa0 [ 25.764020] [] ? up_write+0x1a/0x60 [ 25.769274] [] mmput+0xf3/0x2d0 [ 25.774184] [] do_exit+0x906/0x27b0 [ 25.779450] [] ? release_task.part.19+0x1210/0x1210 [ 25.786104] [] ? up_write+0x1a/0x60 [ 25.791356] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.797475] [] ? mprotect_fixup+0x930/0x930 [ 25.803428] [] do_group_exit+0x111/0x340 [ 25.809117] [] ? do_group_exit+0x340/0x340 [ 25.814974] [] SyS_exit_group+0x1d/0x20 [ 25.820588] [] do_syscall_64+0x1a6/0x490 [ 25.826279] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.833198] 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 [ 25.860148] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.866637] RSP [ 25.870238] CR2: ffffeafff8dc8020 [ 25.873668] ---[ end trace 4d6c298daa4f2baa ]--- [ 25.878396] Kernel panic - not syncing: Fatal exception [ 25.884092] Dumping ftrace buffer: [ 25.887629] (ftrace buffer empty) [ 25.891314] Kernel Offset: disabled [ 25.894915] Rebooting in 86400 seconds..