[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.478808] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.896471] random: sshd: uninitialized urandom read (32 bytes read) [ 21.331300] random: sshd: uninitialized urandom read (32 bytes read) [ 21.857305] random: sshd: uninitialized urandom read (32 bytes read) [ 22.002794] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. [ 27.522357] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.614291] BUG: unable to handle kernel paging request at ffffeafff9120020 [ 27.621630] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.627886] PGD 0 [ 27.629875] [ 27.631505] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.635979] Dumping ftrace buffer: [ 27.639501] (ftrace buffer empty) [ 27.643201] Modules linked in: [ 27.646604] CPU: 0 PID: 3794 Comm: syz-executor032 Not tainted 4.9.121-g681e57b #77 [ 27.654381] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.663709] task: ffff8801b922b000 task.stack: ffff8801d9ba8000 [ 27.669866] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.678752] RSP: 0018:ffff8801d9baf948 EFLAGS: 00010246 [ 27.684201] RAX: dffffc0000000000 RBX: ffffeafff9120000 RCX: 0000000000000000 [ 27.691449] RDX: 1ffffd5fff224004 RSI: ffffffff814f5278 RDI: ffffeafff9120000 [ 27.698696] RBP: ffff8801d9baf970 R08: 0000000000033f00 R09: 0000000000000001 [ 27.705951] R10: ffff8801b922b000 R11: 0000000000000001 R12: ffff8801d9bafc08 [ 27.713237] R13: ffffeafff9120020 R14: ffffeafff9120000 R15: 0000000000000001 [ 27.720635] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.728837] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.734700] CR2: ffffeafff9120020 CR3: 00000001c417f000 CR4: 00000000001606f0 [ 27.742055] Stack: [ 27.744204] ffffeafff9120020 ffff8801d9bafc08 ffff8801cb390800 ffffeafff9120000 [ 27.752328] ffff8801b76206e0 ffff8801d9baf9c8 ffffffff8154c20f ffff8801d9bafc18 [ 27.760426] ffff8801d9bafc10 ffff8801d9bafc88 00003ffe448001e0 00000001cb390000 [ 27.768462] Call Trace: [ 27.771151] [] zap_huge_pmd+0x16f/0x860 [ 27.776781] [] unmap_page_range+0x12ad/0x1730 [ 27.782919] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.789220] [] unmap_single_vma+0x101/0x260 [ 27.795181] [] unmap_vmas+0x102/0x1d0 [ 27.800620] [] exit_mmap+0x214/0x3f0 [ 27.805962] [] ? SyS_munmap+0xa0/0xa0 [ 27.811422] [] ? up_write+0x1a/0x60 [ 27.816676] [] mmput+0xf3/0x2d0 [ 27.821713] [] do_exit+0x906/0x27b0 [ 27.826986] [] ? release_task.part.19+0x1210/0x1210 [ 27.833643] [] ? up_write+0x1a/0x60 [ 27.838903] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.845024] [] ? mprotect_fixup+0x930/0x930 [ 27.850969] [] do_group_exit+0x111/0x340 [ 27.856682] [] ? do_group_exit+0x340/0x340 [ 27.862547] [] SyS_exit_group+0x1d/0x20 [ 27.868151] [] do_syscall_64+0x1a6/0x490 [ 27.873848] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.880754] 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 [ 27.907759] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.914087] RSP [ 27.917828] CR2: ffffeafff9120020 [ 27.921262] ---[ end trace 97aeb10a885ce6a4 ]--- [ 27.926018] Kernel panic - not syncing: Fatal exception [ 27.931671] Dumping ftrace buffer: [ 27.935194] (ftrace buffer empty) [ 27.938880] Kernel Offset: disabled [ 27.942482] Rebooting in 86400 seconds..