[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.039321] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.746227] random: sshd: uninitialized urandom read (32 bytes read) [ 28.209620] random: sshd: uninitialized urandom read (32 bytes read) [ 28.693271] random: sshd: uninitialized urandom read (32 bytes read) [ 30.292841] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 35.979755] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.056357] BUG: unable to handle kernel paging request at ffffeafff9190020 [ 36.063773] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.070027] PGD 0 [ 36.072015] [ 36.073659] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.078129] Dumping ftrace buffer: [ 36.081641] (ftrace buffer empty) [ 36.085332] Modules linked in: [ 36.088627] CPU: 1 PID: 3814 Comm: syz-executor523 Not tainted 4.9.122-g54068d6 #26 [ 36.096433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.105811] task: ffff8801b5660000 task.stack: ffff8801b5630000 [ 36.111849] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.120532] RSP: 0018:ffff8801b5637948 EFLAGS: 00010246 [ 36.125957] RAX: dffffc0000000000 RBX: ffffeafff9190000 RCX: 0000000000000000 [ 36.133236] RDX: 1ffffd5fff232004 RSI: ffffffff814f5918 RDI: ffffeafff9190000 [ 36.140489] RBP: ffff8801b5637970 R08: 0000000000034040 R09: 0000000000000001 [ 36.147734] R10: ffff8801b5660000 R11: 0000000000000001 R12: ffff8801b5637c08 [ 36.154988] R13: ffffeafff9190020 R14: ffffeafff9190000 R15: 0000000000000001 [ 36.162239] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.170450] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.176309] CR2: ffffeafff9190020 CR3: 00000001c3117000 CR4: 00000000001606f0 [ 36.183597] Stack: [ 36.185753] ffffeafff9190020 ffff8801b5637c08 ffff8801c31b0800 ffffeafff9190000 [ 36.193757] ffff8801c5b1d7e8 ffff8801b56379c8 ffffffff8154cb8f ffff8801b5637c18 [ 36.202136] ffff8801b5637c10 ffff8801b5637c88 00003ffe464001e0 00000001c31b0000 [ 36.210133] Call Trace: [ 36.212698] [] zap_huge_pmd+0x16f/0x860 [ 36.218348] [] unmap_page_range+0x12ad/0x1730 [ 36.224475] [] ? vm_normal_page_pmd+0x310/0x310 [ 36.230775] [] unmap_single_vma+0x101/0x260 [ 36.236726] [] unmap_vmas+0x102/0x1d0 [ 36.242156] [] exit_mmap+0x214/0x3f0 [ 36.247495] [] ? SyS_munmap+0xa0/0xa0 [ 36.252921] [] ? up_write+0x1a/0x60 [ 36.258173] [] mmput+0xf3/0x2d0 [ 36.263080] [] do_exit+0x906/0x27b0 [ 36.268332] [] ? release_task.part.19+0x1210/0x1210 [ 36.274978] [] ? up_write+0x1a/0x60 [ 36.280236] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.286359] [] ? mprotect_fixup+0x930/0x930 [ 36.292309] [] do_group_exit+0x111/0x340 [ 36.298002] [] ? do_group_exit+0x340/0x340 [ 36.303866] [] SyS_exit_group+0x1d/0x20 [ 36.309465] [] do_syscall_64+0x1a6/0x490 [ 36.315151] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.322056] 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 [ 36.348965] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.355304] RSP [ 36.358900] CR2: ffffeafff9190020 [ 36.362328] ---[ end trace 344b4d393edd6ceb ]--- [ 36.367054] Kernel panic - not syncing: Fatal exception [ 36.372724] Dumping ftrace buffer: [ 36.376260] (ftrace buffer empty) [ 36.379944] Kernel Offset: disabled [ 36.383544] Rebooting in 86400 seconds..