[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.958868] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.442315] random: sshd: uninitialized urandom read (32 bytes read) [ 21.044111] random: sshd: uninitialized urandom read (32 bytes read) [ 21.583362] random: sshd: uninitialized urandom read (32 bytes read) [ 33.564418] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 39.220459] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.303474] BUG: unable to handle kernel paging request at ffffeafff91b8020 [ 39.310822] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.317290] PGD 0 [ 39.319237] [ 39.320863] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.325330] Dumping ftrace buffer: [ 39.328848] (ftrace buffer empty) [ 39.332534] Modules linked in: [ 39.335818] CPU: 0 PID: 3813 Comm: syz-executor627 Not tainted 4.9.120-gf85543b #76 [ 39.343580] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.352912] task: ffff8801b7331800 task.stack: ffff8801b5ae0000 [ 39.358941] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 39.367620] RSP: 0018:ffff8801b5ae7948 EFLAGS: 00010246 [ 39.373054] RAX: dffffc0000000000 RBX: ffffeafff91b8000 RCX: 0000000000000000 [ 39.380344] RDX: 1ffffd5fff237004 RSI: ffffffff814f5128 RDI: ffffeafff91b8000 [ 39.387607] RBP: ffff8801b5ae7970 R08: 00000000000340a0 R09: 0000000000000001 [ 39.394859] R10: ffff8801b7331800 R11: 0000000000000001 R12: ffff8801b5ae7c08 [ 39.402105] R13: ffffeafff91b8020 R14: ffffeafff91b8000 R15: 0000000000000001 [ 39.409358] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.417561] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.423423] CR2: ffffeafff91b8020 CR3: 00000001ccb8d000 CR4: 00000000001606f0 [ 39.430679] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.437928] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.445177] Stack: [ 39.447306] ffffeafff91b8020 ffff8801b5ae7c08 ffff8801c88a4800 ffffeafff91b8000 [ 39.455316] ffff8801b7133b00 ffff8801b5ae79c8 ffffffff8154bfcf ffff8801b5ae7c18 [ 39.463322] ffff8801b5ae7c10 ffff8801b5ae7c88 00003ffe46e001e0 00000001c88a4000 [ 39.471312] Call Trace: [ 39.473986] [] zap_huge_pmd+0x16f/0x860 [ 39.479594] [] unmap_page_range+0x12ad/0x1730 [ 39.485784] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 39.492093] [] unmap_single_vma+0x101/0x260 [ 39.498046] [] unmap_vmas+0x102/0x1d0 [ 39.503478] [] exit_mmap+0x214/0x3f0 [ 39.508827] [] ? SyS_munmap+0xa0/0xa0 [ 39.514258] [] ? up_write+0x1a/0x60 [ 39.519526] [] mmput+0xf3/0x2d0 [ 39.524522] [] do_exit+0x906/0x27b0 [ 39.529789] [] ? release_task.part.19+0x1210/0x1210 [ 39.536531] [] ? up_write+0x1a/0x60 [ 39.541857] [] ? do_mprotect_pkey+0x71d/0x890 [ 39.547986] [] ? mprotect_fixup+0x930/0x930 [ 39.553940] [] do_group_exit+0x111/0x340 [ 39.559640] [] ? do_group_exit+0x340/0x340 [ 39.565507] [] SyS_exit_group+0x1d/0x20 [ 39.571108] [] do_syscall_64+0x1a6/0x490 [ 39.576908] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.583812] 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 [ 39.611057] RIP [] page_remove_rmap+0x37/0x6d0 [ 39.617391] RSP [ 39.621041] CR2: ffffeafff91b8020 [ 39.624482] ---[ end trace 1bf5952b4c9451f2 ]--- [ 39.629212] Kernel panic - not syncing: Fatal exception [ 39.634895] Dumping ftrace buffer: [ 39.638422] (ftrace buffer empty) [ 39.642114] Kernel Offset: disabled [ 39.645719] Rebooting in 86400 seconds..