[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.134222] 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: [ 22.369409] random: sshd: uninitialized urandom read (32 bytes read) [ 22.559877] random: sshd: uninitialized urandom read (32 bytes read) [ 23.063316] random: sshd: uninitialized urandom read (32 bytes read) [ 40.562199] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. [ 46.223842] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.307127] BUG: unable to handle kernel paging request at ffffeafff8db0020 [ 46.314595] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 46.320850] PGD 0 [ 46.322798] [ 46.324422] Oops: 0000 [#1] PREEMPT SMP KASAN [ 46.329102] Dumping ftrace buffer: [ 46.332620] (ftrace buffer empty) [ 46.336310] Modules linked in: [ 46.339610] CPU: 1 PID: 3802 Comm: syz-executor246 Not tainted 4.9.122-g54068d6 #78 [ 46.347384] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.356824] task: ffff8801b9653000 task.stack: ffff8801c0b70000 [ 46.362871] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 46.371711] RSP: 0018:ffff8801c0b77948 EFLAGS: 00010246 [ 46.377137] RAX: dffffc0000000000 RBX: ffffeafff8db0000 RCX: 0000000000000000 [ 46.389847] RDX: 1ffffd5fff1b6004 RSI: ffffffff814f5918 RDI: ffffeafff8db0000 [ 46.397098] RBP: ffff8801c0b77970 R08: 0000000000034520 R09: 0000000000000001 [ 46.404347] R10: ffff8801b9653000 R11: 0000000000000001 R12: ffff8801c0b77c08 [ 46.411593] R13: ffffeafff8db0020 R14: ffffeafff8db0000 R15: 0000000000000001 [ 46.418847] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 46.427048] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.432908] CR2: ffffeafff8db0020 CR3: 00000001c8369000 CR4: 00000000001606f0 [ 46.440150] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.447391] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.454632] Stack: [ 46.456752] ffffeafff8db0020 ffff8801c0b77c08 ffff8801c61ac800 ffffeafff8db0000 [ 46.464735] ffff8801d9b41aa8 ffff8801c0b779c8 ffffffff8154cb8f ffff8801c0b77c18 [ 46.472716] ffff8801c0b77c10 ffff8801c0b77c88 00003ffe36c001e0 00000001c61ac000 [ 46.480713] Call Trace: [ 46.483280] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 46.488879] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 46.494998] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 46.501290] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 46.507242] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 46.512667] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 46.518009] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 46.523436] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 46.528702] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 46.533608] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 46.538857] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 46.545607] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 46.550869] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 46.556990] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 46.562940] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 46.568705] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 46.574570] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 46.580170] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 46.585856] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 46.592749] Code: 55 41 54 53 48 89 fb e8 58 b4 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 23 b4 e6 [ 46.619582] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 46.625919] RSP <ffff8801c0b77948> [ 46.629522] CR2: ffffeafff8db0020 [ 46.632972] ---[ end trace 4ee684d27512db8e ]--- [ 46.637699] Kernel panic - not syncing: Fatal exception [ 46.643340] Dumping ftrace buffer: [ 46.646856] (ftrace buffer empty) [ 46.650541] Kernel Offset: disabled [ 46.654142] Rebooting in 86400 seconds..