[....] 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[ 13.827433] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.132760] random: sshd: uninitialized urandom read (32 bytes read) [ 20.436299] random: sshd: uninitialized urandom read (32 bytes read) [ 20.933516] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 26.672706] urandom_read: 1 callbacks suppressed [ 26.672710] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.768432] BUG: unable to handle kernel paging request at ffffeafff9130020 [ 26.775839] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.782091] PGD 0 [ 26.784040] [ 26.785724] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.790208] Dumping ftrace buffer: [ 26.793724] (ftrace buffer empty) [ 26.797421] Modules linked in: [ 26.800709] CPU: 0 PID: 3798 Comm: syz-executor711 Not tainted 4.9.121-g681e57b #25 [ 26.808474] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.817809] task: ffff8801b9799800 task.stack: ffff8801be3b0000 [ 26.823836] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.832834] RSP: 0018:ffff8801be3b7948 EFLAGS: 00010246 [ 26.838309] RAX: dffffc0000000000 RBX: ffffeafff9130000 RCX: 0000000000000000 [ 26.845562] RDX: 1ffffd5fff226004 RSI: ffffffff814f5278 RDI: ffffeafff9130000 [ 26.852807] RBP: ffff8801be3b7970 R08: 0000000000033ee0 R09: 0000000000000001 [ 26.860170] R10: ffff8801b9799800 R11: 0000000000000001 R12: ffff8801be3b7c08 [ 26.867420] R13: ffffeafff9130020 R14: ffffeafff9130000 R15: 0000000000000001 [ 26.874672] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.882917] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.888781] CR2: ffffeafff9130020 CR3: 00000001ca435000 CR4: 00000000001606f0 [ 26.896031] Stack: [ 26.898159] ffffeafff9130020 ffff8801be3b7c08 ffff8801c84bc800 ffffeafff9130000 [ 26.906200] ffff8801b913f630 ffff8801be3b79c8 ffffffff8154c20f ffff8801be3b7c18 [ 26.914296] ffff8801be3b7c10 ffff8801be3b7c88 00003ffe44c001e0 00000001c84bc000 [ 26.922465] Call Trace: [ 26.925087] [] zap_huge_pmd+0x16f/0x860 [ 26.930700] [] unmap_page_range+0x12ad/0x1730 [ 26.936827] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.943123] [] unmap_single_vma+0x101/0x260 [ 26.949076] [] unmap_vmas+0x102/0x1d0 [ 26.954510] [] exit_mmap+0x214/0x3f0 [ 26.959891] [] ? SyS_munmap+0xa0/0xa0 [ 26.965330] [] ? up_write+0x1a/0x60 [ 26.970586] [] mmput+0xf3/0x2d0 [ 26.975500] [] do_exit+0x906/0x27b0 [ 26.980755] [] ? release_task.part.19+0x1210/0x1210 [ 26.987403] [] ? up_write+0x1a/0x60 [ 26.992669] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.998799] [] ? mprotect_fixup+0x930/0x930 [ 27.004752] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 27.012260] [] do_group_exit+0x111/0x340 [ 27.017946] [] ? do_group_exit+0x340/0x340 [ 27.023805] [] SyS_exit_group+0x1d/0x20 [ 27.029412] [] do_syscall_64+0x1a6/0x490 [ 27.035104] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.042003] 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 [ 27.068873] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.075279] RSP [ 27.078884] CR2: ffffeafff9130020 [ 27.082315] ---[ end trace 41091455f0ef7049 ]--- [ 27.087097] Kernel panic - not syncing: Fatal exception [ 27.092738] Dumping ftrace buffer: [ 27.096252] (ftrace buffer empty) [ 27.099938] Kernel Offset: disabled [ 27.103596] Rebooting in 86400 seconds..