[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.950016] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.558757] random: sshd: uninitialized urandom read (32 bytes read) [ 29.002163] random: sshd: uninitialized urandom read (32 bytes read) [ 29.499232] random: sshd: uninitialized urandom read (32 bytes read) [ 29.637041] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 35.233164] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.312330] BUG: unable to handle kernel paging request at ffffeafff92d0020 [ 35.319882] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.326126] PGD 0 [ 35.328069] [ 35.329757] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.334242] Dumping ftrace buffer: [ 35.337754] (ftrace buffer empty) [ 35.341448] Modules linked in: [ 35.344734] CPU: 1 PID: 3807 Comm: syz-executor295 Not tainted 4.9.121-g681e57b #25 [ 35.352501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.361836] task: ffff8801b867b000 task.stack: ffff8801d9bd0000 [ 35.367866] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.376579] RSP: 0018:ffff8801d9bd7948 EFLAGS: 00010246 [ 35.382019] RAX: dffffc0000000000 RBX: ffffeafff92d0000 RCX: ffffea0006d28000 [ 35.389388] RDX: 1ffffd5fff25a004 RSI: ffffffff814f5278 RDI: ffffeafff92d0000 [ 35.396632] RBP: ffff8801d9bd7970 R08: 0000000000033ee0 R09: 0000000000000001 [ 35.403988] R10: ffff8801b867b000 R11: 0000000000000001 R12: ffff8801d9bd7c08 [ 35.411231] R13: ffffeafff92d0020 R14: ffffeafff92d0000 R15: 0000000000000001 [ 35.418485] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.426681] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.432535] CR2: ffffeafff92d0020 CR3: 00000001c3b39000 CR4: 00000000001606f0 [ 35.439783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.447027] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.454370] Stack: [ 35.456494] ffffeafff92d0020 ffff8801d9bd7c08 ffff8801c3a97810 ffffeafff92d0000 [ 35.464476] ffff8801b5f73370 ffff8801d9bd79c8 ffffffff8154c20f ffff8801d9bd7c18 [ 35.472453] ffff8801d9bd7c10 ffff8801d9bd7c88 00003ffe4b4001a0 00000001c3a97000 [ 35.480446] Call Trace: [ 35.483012] [] zap_huge_pmd+0x16f/0x860 [ 35.488610] [] unmap_page_range+0x12ad/0x1730 [ 35.494834] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 35.501148] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 35.508069] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 35.514883] [] unmap_single_vma+0x101/0x260 [ 35.520866] [] unmap_vmas+0x102/0x1d0 [ 35.526291] [] exit_mmap+0x214/0x3f0 [ 35.531644] [] ? SyS_munmap+0xa0/0xa0 [ 35.537067] [] ? up_write+0x1a/0x60 [ 35.542316] [] mmput+0xf3/0x2d0 [ 35.547220] [] do_exit+0x906/0x27b0 [ 35.552473] [] ? release_task.part.19+0x1210/0x1210 [ 35.559111] [] ? up_write+0x1a/0x60 [ 35.564362] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.570563] [] ? mprotect_fixup+0x930/0x930 [ 35.576790] [] do_group_exit+0x111/0x340 [ 35.582476] [] ? do_group_exit+0x340/0x340 [ 35.588334] [] SyS_exit_group+0x1d/0x20 [ 35.593931] [] do_syscall_64+0x1a6/0x490 [ 35.599615] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.606511] 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 [ 35.633449] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.639797] RSP [ 35.643392] CR2: ffffeafff92d0020 [ 35.646818] ---[ end trace 40cd84e43503f3db ]--- [ 35.651540] Kernel panic - not syncing: Fatal exception [ 35.657225] Dumping ftrace buffer: [ 35.660745] (ftrace buffer empty) [ 35.664430] Kernel Offset: disabled [ 35.668035] Rebooting in 86400 seconds..