[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.802319] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.264095] random: sshd: uninitialized urandom read (32 bytes read) [ 16.455884] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.026358] random: sshd: uninitialized urandom read (32 bytes read) [ 17.190859] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. [ 23.194620] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.293456] BUG: unable to handle kernel paging request at ffffeafff90d0020 [ 23.300802] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.307048] PGD 0 [ 23.308995] [ 23.310617] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.315087] Dumping ftrace buffer: [ 23.318598] (ftrace buffer empty) [ 23.322285] Modules linked in: [ 23.325582] CPU: 0 PID: 3778 Comm: syz-executor822 Not tainted 4.9.122-g54068d6 #26 [ 23.333365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.342696] task: ffff8801bb766000 task.stack: ffff8801bf3f8000 [ 23.348724] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.357403] RSP: 0018:ffff8801bf3ff948 EFLAGS: 00010246 [ 23.362824] RAX: dffffc0000000000 RBX: ffffeafff90d0000 RCX: 0000000000000000 [ 23.370068] RDX: 1ffffd5fff21a004 RSI: ffffffff814f5918 RDI: ffffeafff90d0000 [ 23.377327] RBP: ffff8801bf3ff970 R08: 0000000000033d20 R09: 0000000000000001 [ 23.384573] R10: ffff8801bb766000 R11: 0000000000000001 R12: ffff8801bf3ffc08 [ 23.391816] R13: ffffeafff90d0020 R14: ffffeafff90d0000 R15: 0000000000000001 [ 23.399062] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.407265] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.413121] CR2: ffffeafff90d0020 CR3: 00000001bf377000 CR4: 00000000001606f0 [ 23.420370] Stack: [ 23.422496] ffffeafff90d0020 ffff8801bf3ffc08 ffff8801bceb7800 ffffeafff90d0000 [ 23.430527] ffff8801ba24cdc0 ffff8801bf3ff9c8 ffffffff8154cb8f ffff8801bf3ffc18 [ 23.438512] ffff8801bf3ffc10 ffff8801bf3ffc88 00003ffe434001e0 00000001bceb7000 [ 23.446498] Call Trace: [ 23.449064] [] zap_huge_pmd+0x16f/0x860 [ 23.454667] [] unmap_page_range+0x12ad/0x1730 [ 23.460793] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.467095] [] unmap_single_vma+0x101/0x260 [ 23.473042] [] unmap_vmas+0x102/0x1d0 [ 23.478468] [] exit_mmap+0x214/0x3f0 [ 23.483808] [] ? SyS_munmap+0xa0/0xa0 [ 23.489240] [] ? up_write+0x1a/0x60 [ 23.494492] [] mmput+0xf3/0x2d0 [ 23.499399] [] do_exit+0x906/0x27b0 [ 23.504657] [] ? release_task.part.19+0x1210/0x1210 [ 23.511347] [] ? up_write+0x1a/0x60 [ 23.516599] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.522747] [] ? mprotect_fixup+0x930/0x930 [ 23.528711] [] do_group_exit+0x111/0x340 [ 23.534402] [] ? do_group_exit+0x340/0x340 [ 23.540265] [] SyS_exit_group+0x1d/0x20 [ 23.545866] [] do_syscall_64+0x1a6/0x490 [ 23.551555] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.558458] 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 [ 23.585343] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.591680] RSP [ 23.595277] CR2: ffffeafff90d0020 [ 23.598704] ---[ end trace 9811fb485df3c8fe ]--- [ 23.603450] Kernel panic - not syncing: Fatal exception [ 23.609123] Dumping ftrace buffer: [ 23.612645] (ftrace buffer empty) [ 23.616331] Kernel Offset: disabled [ 23.619935] Rebooting in 86400 seconds..