[....] 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[ 11.803112] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.856487] random: sshd: uninitialized urandom read (32 bytes read) [ 15.130067] random: sshd: uninitialized urandom read (32 bytes read) [ 15.651092] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 21.497015] urandom_read: 1 callbacks suppressed [ 21.497018] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.579495] BUG: unable to handle kernel paging request at ffffeafff8f58020 [ 21.586921] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.593194] PGD 0 [ 21.595142] [ 21.596769] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.601248] Dumping ftrace buffer: [ 21.604934] (ftrace buffer empty) [ 21.608625] Modules linked in: [ 21.611913] CPU: 0 PID: 3749 Comm: syz-executor610 Not tainted 4.9.122-g54068d6 #26 [ 21.619679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.629037] task: ffff8801bd04c800 task.stack: ffff8801bc6f0000 [ 21.635166] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.643846] RSP: 0018:ffff8801bc6f7948 EFLAGS: 00010246 [ 21.649271] RAX: dffffc0000000000 RBX: ffffeafff8f58000 RCX: 0000000000000000 [ 21.656517] RDX: 1ffffd5fff1eb004 RSI: ffffffff814f5918 RDI: ffffeafff8f58000 [ 21.663767] RBP: ffff8801bc6f7970 R08: 0000000000033860 R09: 0000000000000001 [ 21.671017] R10: ffff8801bd04c800 R11: 0000000000000001 R12: ffff8801bc6f7c08 [ 21.678261] R13: ffffeafff8f58020 R14: ffffeafff8f58000 R15: 0000000000000001 [ 21.685506] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.693709] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.699573] CR2: ffffeafff8f58020 CR3: 00000001c79dd000 CR4: 00000000001606f0 [ 21.706819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.714068] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.721329] Stack: [ 21.723458] ffffeafff8f58020 ffff8801bc6f7c08 ffff8801c6c54800 ffffeafff8f58000 [ 21.731472] ffff8801beba5e70 ffff8801bc6f79c8 ffffffff8154cb8f ffff8801bc6f7c18 [ 21.739503] ffff8801bc6f7c10 ffff8801bc6f7c88 00003ffe3d6001e0 00000001c6c54000 [ 21.747494] Call Trace: [ 21.750064] [] zap_huge_pmd+0x16f/0x860 [ 21.755671] [] unmap_page_range+0x12ad/0x1730 [ 21.761797] [] ? vm_normal_page_pmd+0x310/0x310 [ 21.768100] [] unmap_single_vma+0x101/0x260 [ 21.774052] [] unmap_vmas+0x102/0x1d0 [ 21.779484] [] exit_mmap+0x214/0x3f0 [ 21.784823] [] ? SyS_munmap+0xa0/0xa0 [ 21.790253] [] ? up_write+0x1a/0x60 [ 21.795508] [] mmput+0xf3/0x2d0 [ 21.800418] [] do_exit+0x906/0x27b0 [ 21.805676] [] ? release_task.part.19+0x1210/0x1210 [ 21.812337] [] ? up_write+0x1a/0x60 [ 21.817592] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.823716] [] ? mprotect_fixup+0x930/0x930 [ 21.829670] [] do_group_exit+0x111/0x340 [ 21.835359] [] ? do_group_exit+0x340/0x340 [ 21.841223] [] SyS_exit_group+0x1d/0x20 [ 21.846824] [] do_syscall_64+0x1a6/0x490 [ 21.852517] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.859423] 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 [ 21.886404] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.892737] RSP [ 21.896335] CR2: ffffeafff8f58020 [ 21.899766] ---[ end trace 4b237581130a0a2e ]--- [ 21.904494] Kernel panic - not syncing: Fatal exception [ 21.910174] Dumping ftrace buffer: [ 21.913709] (ftrace buffer empty) [ 21.917393] Kernel Offset: disabled [ 21.920997] Rebooting in 86400 seconds..