[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.808918] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.548041] random: sshd: uninitialized urandom read (32 bytes read) [ 30.810569] random: sshd: uninitialized urandom read (32 bytes read) [ 31.329909] random: sshd: uninitialized urandom read (32 bytes read) [ 32.429122] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 38.010764] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.091164] BUG: unable to handle kernel paging request at ffffeafff8e58020 [ 38.098545] IP: [] page_remove_rmap+0x37/0x6d0 [ 38.104814] PGD 0 [ 38.106759] [ 38.108379] Oops: 0000 [#1] PREEMPT SMP KASAN [ 38.112850] Dumping ftrace buffer: [ 38.116369] (ftrace buffer empty) [ 38.120055] Modules linked in: [ 38.123399] CPU: 0 PID: 3713 Comm: syz-executor664 Not tainted 4.9.122-g54068d6 #78 [ 38.131169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.140500] task: ffff8801c0cb9800 task.stack: ffff8801c0408000 [ 38.146533] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 38.155353] RSP: 0018:ffff8801c040f948 EFLAGS: 00010246 [ 38.160836] RAX: dffffc0000000000 RBX: ffffeafff8e58000 RCX: 0000000000000000 [ 38.168087] RDX: 1ffffd5fff1cb004 RSI: ffffffff814f5918 RDI: ffffeafff8e58000 [ 38.175334] RBP: ffff8801c040f970 R08: 0000000000035000 R09: 0000000000000001 [ 38.182577] R10: ffff8801c0cb9800 R11: 0000000000000001 R12: ffff8801c040fc08 [ 38.189819] R13: ffffeafff8e58020 R14: ffffeafff8e58000 R15: 0000000000000001 [ 38.197069] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.205269] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.211264] CR2: ffffeafff8e58020 CR3: 00000001c8bce000 CR4: 00000000001606f0 [ 38.218521] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.225763] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.233002] Stack: [ 38.235128] ffffeafff8e58020 ffff8801c040fc08 ffff8801c4777800 ffffeafff8e58000 [ 38.243120] ffff8801c4cca160 ffff8801c040f9c8 ffffffff8154cb8f ffff8801c040fc18 [ 38.251143] ffff8801c040fc10 ffff8801c040fc88 00003ffe396001e0 00000001c4777000 [ 38.259127] Call Trace: [ 38.261694] [] zap_huge_pmd+0x16f/0x860 [ 38.267296] [] unmap_page_range+0x12ad/0x1730 [ 38.273413] [] ? vm_normal_page_pmd+0x310/0x310 [ 38.279705] [] unmap_single_vma+0x101/0x260 [ 38.285653] [] unmap_vmas+0x102/0x1d0 [ 38.291074] [] exit_mmap+0x214/0x3f0 [ 38.296408] [] ? SyS_munmap+0xa0/0xa0 [ 38.301881] [] ? up_write+0x1a/0x60 [ 38.307141] [] mmput+0xf3/0x2d0 [ 38.312049] [] do_exit+0x906/0x27b0 [ 38.317302] [] ? release_task.part.19+0x1210/0x1210 [ 38.323940] [] ? up_write+0x1a/0x60 [ 38.329190] [] ? do_mprotect_pkey+0x71d/0x890 [ 38.335308] [] ? mprotect_fixup+0x930/0x930 [ 38.341256] [] do_group_exit+0x111/0x340 [ 38.346938] [] ? do_group_exit+0x340/0x340 [ 38.352821] [] SyS_exit_group+0x1d/0x20 [ 38.358423] [] do_syscall_64+0x1a6/0x490 [ 38.364110] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 38.371016] 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 [ 38.397983] RIP [] page_remove_rmap+0x37/0x6d0 [ 38.404312] RSP [ 38.407912] CR2: ffffeafff8e58020 [ 38.411340] ---[ end trace f784b184d1992bd6 ]--- [ 38.416103] Kernel panic - not syncing: Fatal exception [ 38.421765] Dumping ftrace buffer: [ 38.425278] (ftrace buffer empty) [ 38.428962] Kernel Offset: disabled [ 38.432560] Rebooting in 86400 seconds..