[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.438766] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.884971] random: sshd: uninitialized urandom read (32 bytes read) [ 26.336963] random: sshd: uninitialized urandom read (32 bytes read) [ 26.842536] random: sshd: uninitialized urandom read (32 bytes read) [ 26.977966] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 32.755724] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.833316] BUG: unable to handle kernel paging request at ffffeafff8f18020 [ 32.840748] IP: [] page_remove_rmap+0x37/0x6d0 [ 32.847084] PGD 0 [ 32.849033] [ 32.850661] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.855136] Dumping ftrace buffer: [ 32.858719] (ftrace buffer empty) [ 32.862415] Modules linked in: [ 32.865710] CPU: 1 PID: 3805 Comm: syz-executor242 Not tainted 4.9.121-g681e57b #25 [ 32.873483] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.882924] task: ffff8801b74b3000 task.stack: ffff8801b64b0000 [ 32.889015] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 32.897794] RSP: 0018:ffff8801b64b7948 EFLAGS: 00010246 [ 32.903230] RAX: dffffc0000000000 RBX: ffffeafff8f18000 RCX: ffffea00070e0000 [ 32.910484] RDX: 1ffffd5fff1e3004 RSI: ffffffff814f5278 RDI: ffffeafff8f18000 [ 32.917739] RBP: ffff8801b64b7970 R08: 0000000000034140 R09: 0000000000000001 [ 32.924991] R10: ffff8801b74b3000 R11: 0000000000000001 R12: ffff8801b64b7c08 [ 32.932245] R13: ffffeafff8f18020 R14: ffffeafff8f18000 R15: 0000000000000001 [ 32.939498] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.947702] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.953572] CR2: ffffeafff8f18020 CR3: 00000001cb74c000 CR4: 00000000001606f0 [ 32.960822] Stack: [ 32.962951] ffffeafff8f18020 ffff8801b64b7c08 ffff8801c9a29810 ffffeafff8f18000 [ 32.970961] ffff8801ba1ffdc0 ffff8801b64b79c8 ffffffff8154c20f ffff8801b64b7c18 [ 32.979065] ffff8801b64b7c10 ffff8801b64b7c88 00003ffe3c6001a0 00000001c9a29000 [ 32.987061] Call Trace: [ 32.989631] [] zap_huge_pmd+0x16f/0x860 [ 32.995242] [] unmap_page_range+0x12ad/0x1730 [ 33.001368] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.007668] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 33.014636] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.021511] [] unmap_single_vma+0x101/0x260 [ 33.027478] [] unmap_vmas+0x102/0x1d0 [ 33.032954] [] exit_mmap+0x214/0x3f0 [ 33.038314] [] ? SyS_munmap+0xa0/0xa0 [ 33.043745] [] ? up_write+0x1a/0x60 [ 33.048997] [] mmput+0xf3/0x2d0 [ 33.053906] [] do_exit+0x906/0x27b0 [ 33.059267] [] ? release_task.part.19+0x1210/0x1210 [ 33.065913] [] ? up_write+0x1a/0x60 [ 33.071251] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.077390] [] ? mprotect_fixup+0x930/0x930 [ 33.083346] [] do_group_exit+0x111/0x340 [ 33.089090] [] ? do_group_exit+0x340/0x340 [ 33.095004] [] SyS_exit_group+0x1d/0x20 [ 33.100881] [] do_syscall_64+0x1a6/0x490 [ 33.106578] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.113479] 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 [ 33.140693] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.147135] RSP [ 33.150737] CR2: ffffeafff8f18020 [ 33.154171] ---[ end trace f14d29f9678027a8 ]--- [ 33.158957] Kernel panic - not syncing: Fatal exception [ 33.164663] Dumping ftrace buffer: [ 33.168192] (ftrace buffer empty) [ 33.171882] Kernel Offset: disabled [ 33.175491] Rebooting in 86400 seconds..