[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.229090] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.253904] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.555874] random: sshd: uninitialized urandom read (32 bytes read) [ 15.076141] random: sshd: uninitialized urandom read (32 bytes read) [ 16.744665] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 22.240473] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.325400] BUG: unable to handle kernel paging request at ffffeafff9030020 [ 22.332754] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.339004] PGD 0 [ 22.340949] [ 22.342580] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.347050] Dumping ftrace buffer: [ 22.350564] (ftrace buffer empty) [ 22.354245] Modules linked in: [ 22.357531] CPU: 1 PID: 3758 Comm: syz-executor665 Not tainted 4.9.122-g54068d6 #26 [ 22.365293] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.374651] task: ffff8801bcb63000 task.stack: ffff8801bb188000 [ 22.380680] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.389373] RSP: 0018:ffff8801bb18f948 EFLAGS: 00010246 [ 22.394797] RAX: dffffc0000000000 RBX: ffffeafff9030000 RCX: 0000000000000000 [ 22.402043] RDX: 1ffffd5fff206004 RSI: ffffffff814f5918 RDI: ffffeafff9030000 [ 22.409288] RBP: ffff8801bb18f970 R08: 0000000000033a60 R09: 0000000000000001 [ 22.416545] R10: ffff8801bcb63000 R11: 0000000000000001 R12: ffff8801bb18fc08 [ 22.423900] R13: ffffeafff9030020 R14: ffffeafff9030000 R15: 0000000000000001 [ 22.431159] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.439485] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.445398] CR2: ffffeafff9030020 CR3: 00000001c3e7c000 CR4: 00000000001606f0 [ 22.452659] Stack: [ 22.454799] ffffeafff9030020 ffff8801bb18fc08 ffff8801c58bd800 ffffeafff9030000 [ 22.462799] ffff8801c3c7ea50 ffff8801bb18f9c8 ffffffff8154cb8f ffff8801bb18fc18 [ 22.470786] ffff8801bb18fc10 ffff8801bb18fc88 00003ffe40c001e0 00000001c58bd000 [ 22.478829] Call Trace: [ 22.481503] [] zap_huge_pmd+0x16f/0x860 [ 22.487110] [] unmap_page_range+0x12ad/0x1730 [ 22.493233] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.499670] [] unmap_single_vma+0x101/0x260 [ 22.505622] [] unmap_vmas+0x102/0x1d0 [ 22.511054] [] exit_mmap+0x214/0x3f0 [ 22.516517] [] ? SyS_munmap+0xa0/0xa0 [ 22.521953] [] ? up_write+0x1a/0x60 [ 22.527210] [] mmput+0xf3/0x2d0 [ 22.532116] [] do_exit+0x906/0x27b0 [ 22.537373] [] ? release_task.part.19+0x1210/0x1210 [ 22.544024] [] ? up_write+0x1a/0x60 [ 22.549279] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.555668] [] ? mprotect_fixup+0x930/0x930 [ 22.561736] [] do_group_exit+0x111/0x340 [ 22.567439] [] ? do_group_exit+0x340/0x340 [ 22.573306] [] SyS_exit_group+0x1d/0x20 [ 22.578909] [] do_syscall_64+0x1a6/0x490 [ 22.584766] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.591662] 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 [ 22.618916] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.625392] RSP [ 22.628994] CR2: ffffeafff9030020 [ 22.632432] ---[ end trace 73048a761a777977 ]--- [ 22.637167] Kernel panic - not syncing: Fatal exception [ 22.642769] Dumping ftrace buffer: [ 22.646285] (ftrace buffer empty) [ 22.649980] Kernel Offset: disabled [ 22.653619] Rebooting in 86400 seconds..