[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.090135] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.940146] random: sshd: uninitialized urandom read (32 bytes read) [ 16.300770] random: sshd: uninitialized urandom read (32 bytes read) [ 16.849035] random: sshd: uninitialized urandom read (32 bytes read) [ 16.992606] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 22.639405] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.717498] BUG: unable to handle kernel paging request at ffffeafff9120020 [ 22.724872] IP: [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 22.731119] PGD 0 [ 22.733098] [ 22.734731] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.739222] Dumping ftrace buffer: [ 22.742763] (ftrace buffer empty) [ 22.746469] Modules linked in: [ 22.749765] CPU: 0 PID: 3787 Comm: syz-executor898 Not tainted 4.9.121-g681e57b #25 [ 22.757529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.767112] task: ffff8801b8bc6000 task.stack: ffff8801b6568000 [ 22.773157] RIP: 0010:[<ffffffff814f5297>] [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 22.781834] RSP: 0018:ffff8801b656f948 EFLAGS: 00010246 [ 22.787258] RAX: dffffc0000000000 RBX: ffffeafff9120000 RCX: 0000000000000000 [ 22.794502] RDX: 1ffffd5fff224004 RSI: ffffffff814f5278 RDI: ffffeafff9120000 [ 22.801755] RBP: ffff8801b656f970 R08: 0000000000033760 R09: 0000000000000001 [ 22.809015] R10: ffff8801b8bc6000 R11: 0000000000000001 R12: ffff8801b656fc08 [ 22.816264] R13: ffffeafff9120020 R14: ffffeafff9120000 R15: 0000000000000001 [ 22.823511] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 22.831711] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.837568] CR2: ffffeafff9120020 CR3: 00000001cb27f000 CR4: 00000000001606f0 [ 22.844815] Stack: [ 22.846940] ffffeafff9120020 ffff8801b656fc08 ffff8801c54c4800 ffffeafff9120000 [ 22.854942] ffff8801b6fc59a0 ffff8801b656f9c8 ffffffff8154c20f ffff8801b656fc18 [ 22.862988] ffff8801b656fc10 ffff8801b656fc88 00003ffe448001e0 00000001c54c4000 [ 22.871167] Call Trace: [ 22.873739] [<ffffffff8154c20f>] zap_huge_pmd+0x16f/0x860 [ 22.879344] [<ffffffff814ca95d>] unmap_page_range+0x12ad/0x1730 [ 22.885463] [<ffffffff814c96b0>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.891776] [<ffffffff814caee1>] unmap_single_vma+0x101/0x260 [ 22.897723] [<ffffffff814cb822>] unmap_vmas+0x102/0x1d0 [ 22.903158] [<ffffffff814e4214>] exit_mmap+0x214/0x3f0 [ 22.908508] [<ffffffff814e4000>] ? SyS_munmap+0xa0/0xa0 [ 22.913934] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 22.919186] [<ffffffff8112d6f3>] mmput+0xf3/0x2d0 [ 22.924119] [<ffffffff81142c26>] do_exit+0x906/0x27b0 [ 22.929386] [<ffffffff81142320>] ? release_task.part.19+0x1210/0x1210 [ 22.936027] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 22.941279] [<ffffffff814ec78d>] ? do_mprotect_pkey+0x71d/0x890 [ 22.947396] [<ffffffff814ec070>] ? mprotect_fixup+0x930/0x930 [ 22.953340] [<ffffffff81148de1>] do_group_exit+0x111/0x340 [ 22.959025] [<ffffffff81149010>] ? do_group_exit+0x340/0x340 [ 22.964884] [<ffffffff8114902d>] SyS_exit_group+0x1d/0x20 [ 22.970491] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 22.976179] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.983074] 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 [ 23.010187] RIP [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 23.016519] RSP <ffff8801b656f948> [ 23.020118] CR2: ffffeafff9120020 [ 23.023550] ---[ end trace e177d88b18e27a29 ]--- [ 23.028277] Kernel panic - not syncing: Fatal exception [ 23.033963] Dumping ftrace buffer: [ 23.037483] (ftrace buffer empty) [ 23.041169] Kernel Offset: disabled [ 23.044772] Rebooting in 86400 seconds..