[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.533795] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.326721] random: sshd: uninitialized urandom read (32 bytes read) [ 18.621189] random: sshd: uninitialized urandom read (32 bytes read) [ 19.116126] random: sshd: uninitialized urandom read (32 bytes read) [ 33.774383] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 39.339167] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.423424] BUG: unable to handle kernel paging request at ffffeafff91a8020 [ 39.430774] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.437038] PGD 0 [ 39.438982] [ 39.440603] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.445072] Dumping ftrace buffer: [ 39.448626] (ftrace buffer empty) [ 39.452355] Modules linked in: [ 39.455649] CPU: 0 PID: 3816 Comm: syz-executor960 Not tainted 4.9.121-g681e57b #25 [ 39.463414] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.472743] task: ffff8801b7073000 task.stack: ffff8801b7840000 [ 39.478772] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 39.487454] RSP: 0018:ffff8801b7847948 EFLAGS: 00010246 [ 39.492878] RAX: dffffc0000000000 RBX: ffffeafff91a8000 RCX: 0000000000000000 [ 39.500123] RDX: 1ffffd5fff235004 RSI: ffffffff814f5278 RDI: ffffeafff91a8000 [ 39.507368] RBP: ffff8801b7847970 R08: 00000000000342a0 R09: 0000000000000001 [ 39.514611] R10: ffff8801b7073000 R11: 0000000000000001 R12: ffff8801b7847c08 [ 39.521860] R13: ffffeafff91a8020 R14: ffffeafff91a8000 R15: 0000000000000001 [ 39.529105] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.537309] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.543164] CR2: ffffeafff91a8020 CR3: 00000001cb1c8000 CR4: 00000000001606f0 [ 39.550411] Stack: [ 39.552578] ffffeafff91a8020 ffff8801b7847c08 ffff8801c99dd800 ffffeafff91a8000 [ 39.560573] ffff8801b89bac60 ffff8801b78479c8 ffffffff8154c20f ffff8801b7847c18 [ 39.568659] ffff8801b7847c10 ffff8801b7847c88 00003ffe46a001e0 00000001c99dd000 [ 39.576638] Call Trace: [ 39.579209] [] zap_huge_pmd+0x16f/0x860 [ 39.584807] [] unmap_page_range+0x12ad/0x1730 [ 39.590927] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 39.597220] [] unmap_single_vma+0x101/0x260 [ 39.603239] [] unmap_vmas+0x102/0x1d0 [ 39.608674] [] exit_mmap+0x214/0x3f0 [ 39.614015] [] ? SyS_munmap+0xa0/0xa0 [ 39.619439] [] ? up_write+0x1a/0x60 [ 39.624696] [] mmput+0xf3/0x2d0 [ 39.629601] [] do_exit+0x906/0x27b0 [ 39.634851] [] ? release_task.part.19+0x1210/0x1210 [ 39.641499] [] ? up_write+0x1a/0x60 [ 39.646747] [] ? do_mprotect_pkey+0x71d/0x890 [ 39.652870] [] ? mprotect_fixup+0x930/0x930 [ 39.658818] [] do_group_exit+0x111/0x340 [ 39.664512] [] ? do_group_exit+0x340/0x340 [ 39.670377] [] SyS_exit_group+0x1d/0x20 [ 39.675975] [] do_syscall_64+0x1a6/0x490 [ 39.681661] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.688556] 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 [ 39.715518] RIP [] page_remove_rmap+0x37/0x6d0 [ 39.721846] RSP [ 39.725450] CR2: ffffeafff91a8020 [ 39.728877] ---[ end trace 6aed3973297817fd ]--- [ 39.733602] Kernel panic - not syncing: Fatal exception [ 39.739225] Dumping ftrace buffer: [ 39.742751] (ftrace buffer empty) [ 39.746436] Kernel Offset: disabled [ 39.750033] Rebooting in 86400 seconds..