[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.538328] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.918316] random: sshd: uninitialized urandom read (32 bytes read) [ 33.206185] random: sshd: uninitialized urandom read (32 bytes read) [ 33.727893] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 39.525942] urandom_read: 1 callbacks suppressed [ 39.525945] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.608074] BUG: unable to handle kernel paging request at ffffeafff9028020 [ 39.615442] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.621691] PGD 0 [ 39.623765] [ 39.625393] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.629871] Dumping ftrace buffer: [ 39.633386] (ftrace buffer empty) [ 39.637089] Modules linked in: [ 39.640382] CPU: 1 PID: 3795 Comm: syz-executor500 Not tainted 4.9.120-gf85543b #76 [ 39.648256] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.657594] task: ffff8801ba9c8000 task.stack: ffff8801d9bb8000 [ 39.663624] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 39.672304] RSP: 0018:ffff8801d9bbf948 EFLAGS: 00010246 [ 39.677727] RAX: dffffc0000000000 RBX: ffffeafff9028000 RCX: ffffea0006fd0000 [ 39.684976] RDX: 1ffffd5fff205004 RSI: ffffffff814f5128 RDI: ffffeafff9028000 [ 39.692221] RBP: ffff8801d9bbf970 R08: 0000000000034080 R09: 0000000000000001 [ 39.699466] R10: ffff8801ba9c8000 R11: 0000000000000001 R12: ffff8801d9bbfc08 [ 39.706710] R13: ffffeafff9028020 R14: ffffeafff9028000 R15: 0000000000000001 [ 39.714020] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.722233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.728090] CR2: ffffeafff9028020 CR3: 00000001c332f000 CR4: 00000000001606f0 [ 39.735334] Stack: [ 39.737460] ffffeafff9028020 ffff8801d9bbfc08 ffff8801c1161810 ffffeafff9028000 [ 39.745501] ffff8801bae827e8 ffff8801d9bbf9c8 ffffffff8154bfcf ffff8801d9bbfc18 [ 39.753500] ffff8801d9bbfc10 ffff8801d9bbfc88 00003ffe40a001a0 00000001c1161000 [ 39.761491] Call Trace: [ 39.764055] [] zap_huge_pmd+0x16f/0x860 [ 39.769658] [] unmap_page_range+0x12ad/0x1730 [ 39.775785] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 39.782198] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 39.789107] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 39.795940] [] unmap_single_vma+0x101/0x260 [ 39.801891] [] unmap_vmas+0x102/0x1d0 [ 39.807321] [] exit_mmap+0x214/0x3f0 [ 39.812676] [] ? SyS_munmap+0xa0/0xa0 [ 39.818104] [] ? up_write+0x1a/0x60 [ 39.823357] [] mmput+0xf3/0x2d0 [ 39.828284] [] do_exit+0x906/0x27b0 [ 39.833534] [] ? release_task.part.19+0x1210/0x1210 [ 39.840175] [] ? up_write+0x1a/0x60 [ 39.845423] [] ? do_mprotect_pkey+0x71d/0x890 [ 39.851541] [] ? mprotect_fixup+0x930/0x930 [ 39.857497] [] do_group_exit+0x111/0x340 [ 39.863187] [] ? do_group_exit+0x340/0x340 [ 39.869090] [] SyS_exit_group+0x1d/0x20 [ 39.874706] [] do_syscall_64+0x1a6/0x490 [ 39.880398] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.887299] 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 [ 39.914359] RIP [] page_remove_rmap+0x37/0x6d0 [ 39.920690] RSP [ 39.924295] CR2: ffffeafff9028020 [ 39.927724] ---[ end trace 46edfea121da2067 ]--- [ 39.932455] Kernel panic - not syncing: Fatal exception [ 39.938122] Dumping ftrace buffer: [ 39.941639] (ftrace buffer empty) [ 39.945322] Kernel Offset: disabled [ 39.949001] Rebooting in 86400 seconds..