[....] 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[ 15.567680] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.227070] random: sshd: uninitialized urandom read (32 bytes read) [ 18.478750] random: sshd: uninitialized urandom read (32 bytes read) [ 18.973463] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 24.636330] urandom_read: 1 callbacks suppressed [ 24.636333] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.726639] BUG: unable to handle kernel paging request at ffffeafff9188020 [ 24.734177] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.740447] PGD 0 [ 24.742405] [ 24.744074] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.748554] Dumping ftrace buffer: [ 24.752073] (ftrace buffer empty) [ 24.755766] Modules linked in: [ 24.759071] CPU: 1 PID: 3790 Comm: syz-executor994 Not tainted 4.9.120-gf85543b #76 [ 24.766890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.776274] task: ffff8801b788c800 task.stack: ffff8801b76e8000 [ 24.782316] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.791016] RSP: 0018:ffff8801b76ef948 EFLAGS: 00010246 [ 24.796450] RAX: dffffc0000000000 RBX: ffffeafff9188000 RCX: 0000000000000000 [ 24.803745] RDX: 1ffffd5fff231004 RSI: ffffffff814f5128 RDI: ffffeafff9188000 [ 24.811037] RBP: ffff8801b76ef970 R08: 0000000000033ae0 R09: 0000000000000001 [ 24.818292] R10: ffff8801b788c800 R11: 0000000000000001 R12: ffff8801b76efc08 [ 24.825586] R13: ffffeafff9188020 R14: ffffeafff9188000 R15: 0000000000000001 [ 24.832844] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.841055] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.846919] CR2: ffffeafff9188020 CR3: 00000001c7e98000 CR4: 00000000001606f0 [ 24.854175] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.861427] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.868927] Stack: [ 24.871124] ffffeafff9188020 ffff8801b76efc08 ffff8801cc713800 ffffeafff9188000 [ 24.880142] ffff8801b5d310b0 ffff8801b76ef9c8 ffffffff8154bfcf ffff8801b76efc18 [ 24.888593] ffff8801b76efc10 ffff8801b76efc88 00003ffe462001e0 00000001cc713000 [ 24.896626] Call Trace: [ 24.899206] [] zap_huge_pmd+0x16f/0x860 [ 24.904931] [] unmap_page_range+0x12ad/0x1730 [ 24.911065] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.917478] [] unmap_single_vma+0x101/0x260 [ 24.923434] [] unmap_vmas+0x102/0x1d0 [ 24.928871] [] exit_mmap+0x214/0x3f0 [ 24.934220] [] ? SyS_munmap+0xa0/0xa0 [ 24.939657] [] ? up_write+0x1a/0x60 [ 24.944916] [] mmput+0xf3/0x2d0 [ 24.949830] [] do_exit+0x906/0x27b0 [ 24.955090] [] ? release_task.part.19+0x1210/0x1210 [ 24.961880] [] ? up_write+0x1a/0x60 [ 24.967142] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.973271] [] ? mprotect_fixup+0x930/0x930 [ 24.979228] [] do_group_exit+0x111/0x340 [ 24.985038] [] ? do_group_exit+0x340/0x340 [ 24.990921] [] SyS_exit_group+0x1d/0x20 [ 24.996529] [] do_syscall_64+0x1a6/0x490 [ 25.002225] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.009129] 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 [ 25.036691] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.043041] RSP [ 25.046646] CR2: ffffeafff9188020 [ 25.050081] ---[ end trace 476e76b6367b3a42 ]--- [ 25.054816] Kernel panic - not syncing: Fatal exception [ 25.060576] Dumping ftrace buffer: [ 25.064107] (ftrace buffer empty) [ 25.067823] Kernel Offset: disabled [ 25.071446] Rebooting in 86400 seconds..