[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.589870] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.394513] random: sshd: uninitialized urandom read (32 bytes read) [ 22.856410] random: sshd: uninitialized urandom read (32 bytes read) [ 23.420930] random: sshd: uninitialized urandom read (32 bytes read) [ 23.564904] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 29.138096] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.215645] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 29.223175] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.229429] PGD 0 [ 29.231372] [ 29.232993] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.237461] Dumping ftrace buffer: [ 29.240971] (ftrace buffer empty) [ 29.244657] Modules linked in: [ 29.247962] CPU: 0 PID: 3798 Comm: syz-executor041 Not tainted 4.9.120-gf85543b #76 [ 29.255724] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.265055] task: ffff8801b7951800 task.stack: ffff8801d9060000 [ 29.271093] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.279793] RSP: 0018:ffff8801d9067948 EFLAGS: 00010246 [ 29.285213] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 29.292453] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5128 RDI: ffffeafff9178000 [ 29.299693] RBP: ffff8801d9067970 R08: 0000000000034400 R09: 0000000000000001 [ 29.306953] R10: ffff8801b7951800 R11: 0000000000000001 R12: ffff8801d9067c08 [ 29.314196] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 29.321468] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.329664] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.335548] CR2: ffffeafff9178020 CR3: 00000001c1c98000 CR4: 00000000001606f0 [ 29.342907] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.350148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.357554] Stack: [ 29.359677] ffffeafff9178020 ffff8801d9067c08 ffff8801c3fcf800 ffffeafff9178000 [ 29.367662] ffff8801b7a246e0 ffff8801d90679c8 ffffffff8154bfcf ffff8801d9067c18 [ 29.375661] ffff8801d9067c10 ffff8801d9067c88 00003ffe45e001e0 00000001c3fcf000 [ 29.383660] Call Trace: [ 29.386227] [] zap_huge_pmd+0x16f/0x860 [ 29.391835] [] unmap_page_range+0x12ad/0x1730 [ 29.397960] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.404251] [] unmap_single_vma+0x101/0x260 [ 29.410194] [] unmap_vmas+0x102/0x1d0 [ 29.415618] [] exit_mmap+0x214/0x3f0 [ 29.420955] [] ? SyS_munmap+0xa0/0xa0 [ 29.426380] [] ? up_write+0x1a/0x60 [ 29.431634] [] mmput+0xf3/0x2d0 [ 29.436536] [] do_exit+0x906/0x27b0 [ 29.441786] [] ? release_task.part.19+0x1210/0x1210 [ 29.448426] [] ? up_write+0x1a/0x60 [ 29.453672] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.459788] [] ? mprotect_fixup+0x930/0x930 [ 29.465739] [] do_group_exit+0x111/0x340 [ 29.471437] [] ? do_group_exit+0x340/0x340 [ 29.477298] [] SyS_exit_group+0x1d/0x20 [ 29.482903] [] do_syscall_64+0x1a6/0x490 [ 29.488589] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.495484] 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 [ 29.522421] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.528744] RSP [ 29.532337] CR2: ffffeafff9178020 [ 29.535764] ---[ end trace 44ceca9ced084703 ]--- [ 29.540490] Kernel panic - not syncing: Fatal exception [ 29.546151] Dumping ftrace buffer: [ 29.549665] (ftrace buffer empty) [ 29.553345] Kernel Offset: disabled [ 29.556943] Rebooting in 86400 seconds..