[....] 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[ 12.806543] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.800881] random: sshd: uninitialized urandom read (32 bytes read) [ 19.153197] random: sshd: uninitialized urandom read (32 bytes read) [ 19.641800] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. [ 25.500786] urandom_read: 1 callbacks suppressed [ 25.500789] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.590655] BUG: unable to handle kernel paging request at ffffeafff9010020 [ 25.598178] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.604476] PGD 0 [ 25.606421] [ 25.608159] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.612763] Dumping ftrace buffer: [ 25.616288] (ftrace buffer empty) [ 25.619975] Modules linked in: [ 25.623278] CPU: 1 PID: 3765 Comm: syz-executor406 Not tainted 4.9.121-g681e57b #25 [ 25.631049] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.640387] task: ffff8801bd5e4800 task.stack: ffff8801bbb80000 [ 25.646419] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.655102] RSP: 0018:ffff8801bbb87948 EFLAGS: 00010246 [ 25.660680] RAX: dffffc0000000000 RBX: ffffeafff9010000 RCX: 0000000000000000 [ 25.667946] RDX: 1ffffd5fff202004 RSI: ffffffff814f5278 RDI: ffffeafff9010000 [ 25.675192] RBP: ffff8801bbb87970 R08: 00000000000340a0 R09: 0000000000000001 [ 25.682440] R10: ffff8801bd5e4800 R11: 0000000000000001 R12: ffff8801bbb87c08 [ 25.689690] R13: ffffeafff9010020 R14: ffffeafff9010000 R15: 0000000000000001 [ 25.696978] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.705201] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.711157] CR2: ffffeafff9010020 CR3: 00000001c814f000 CR4: 00000000001606f0 [ 25.718413] Stack: [ 25.720772] ffffeafff9010020 ffff8801bbb87c08 ffff8801cc73b800 ffffeafff9010000 [ 25.728921] ffff8801c8de8f78 ffff8801bbb879c8 ffffffff8154c20f ffff8801bbb87c18 [ 25.736923] ffff8801bbb87c10 ffff8801bbb87c88 00003ffe404001e0 00000001cc73b000 [ 25.744960] Call Trace: [ 25.747543] [] zap_huge_pmd+0x16f/0x860 [ 25.753275] [] unmap_page_range+0x12ad/0x1730 [ 25.759403] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.765700] [] unmap_single_vma+0x101/0x260 [ 25.771663] [] unmap_vmas+0x102/0x1d0 [ 25.777188] [] exit_mmap+0x214/0x3f0 [ 25.782530] [] ? SyS_munmap+0xa0/0xa0 [ 25.787963] [] ? up_write+0x1a/0x60 [ 25.793232] [] mmput+0xf3/0x2d0 [ 25.798139] [] do_exit+0x906/0x27b0 [ 25.803395] [] ? release_task.part.19+0x1210/0x1210 [ 25.810138] [] ? up_write+0x1a/0x60 [ 25.815395] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.821518] [] ? mprotect_fixup+0x930/0x930 [ 25.827491] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 25.835005] [] do_group_exit+0x111/0x340 [ 25.840697] [] ? do_group_exit+0x340/0x340 [ 25.846612] [] SyS_exit_group+0x1d/0x20 [ 25.852224] [] do_syscall_64+0x1a6/0x490 [ 25.857929] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.864848] 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 [ 25.892305] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.898678] RSP [ 25.902280] CR2: ffffeafff9010020 [ 25.905716] ---[ end trace 64ab8f7bcc137696 ]--- [ 25.910459] Kernel panic - not syncing: Fatal exception [ 25.916110] Dumping ftrace buffer: [ 25.919642] (ftrace buffer empty) [ 25.923326] Kernel Offset: disabled [ 25.926933] Rebooting in 86400 seconds..