[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.198756] 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: [ 19.731668] random: sshd: uninitialized urandom read (32 bytes read) [ 20.090613] random: sshd: uninitialized urandom read (32 bytes read) [ 20.605054] random: sshd: uninitialized urandom read (32 bytes read) [ 20.750288] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 26.261665] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.350462] BUG: unable to handle kernel paging request at ffffeafff90c0020 [ 26.357848] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.364108] PGD 0 [ 26.366060] [ 26.367698] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.372177] Dumping ftrace buffer: [ 26.375702] (ftrace buffer empty) [ 26.379516] Modules linked in: [ 26.382828] CPU: 1 PID: 3785 Comm: syz-executor366 Not tainted 4.9.122-g54068d6 #26 [ 26.390846] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.400196] task: ffff8801ba3e6000 task.stack: ffff8801ba188000 [ 26.406240] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.414946] RSP: 0018:ffff8801ba18f948 EFLAGS: 00010246 [ 26.420567] RAX: dffffc0000000000 RBX: ffffeafff90c0000 RCX: 0000000000000000 [ 26.427820] RDX: 1ffffd5fff218004 RSI: ffffffff814f5918 RDI: ffffeafff90c0000 [ 26.435081] RBP: ffff8801ba18f970 R08: 00000000000343a0 R09: 0000000000000001 [ 26.442453] R10: ffff8801ba3e6000 R11: 0000000000000001 R12: ffff8801ba18fc08 [ 26.449716] R13: ffffeafff90c0020 R14: ffffeafff90c0000 R15: 0000000000000001 [ 26.456984] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.465319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.471187] CR2: ffffeafff90c0020 CR3: 00000001c31b7000 CR4: 00000000001606f0 [ 26.478550] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.485813] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.493072] Stack: [ 26.495209] ffffeafff90c0020 ffff8801ba18fc08 ffff8801c52f6800 ffffeafff90c0000 [ 26.503345] ffff8801b871ca50 ffff8801ba18f9c8 ffffffff8154cb8f ffff8801ba18fc18 [ 26.511374] ffff8801ba18fc10 ffff8801ba18fc88 00003ffe430001e0 00000001c52f6000 [ 26.519532] Call Trace: [ 26.522103] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 26.527722] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 26.533864] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 26.540188] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 26.546160] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 26.551658] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 26.557021] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 26.562467] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.567756] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 26.572693] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 26.578005] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 26.584666] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.589940] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 26.596093] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 26.602065] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 26.607778] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 26.613663] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 26.619432] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 26.625149] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.632056] 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 [ 26.659039] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.665386] RSP <ffff8801ba18f948> [ 26.668990] CR2: ffffeafff90c0020 [ 26.672429] ---[ end trace 1307b99347113785 ]--- [ 26.677165] Kernel panic - not syncing: Fatal exception [ 26.682923] Dumping ftrace buffer: [ 26.686477] (ftrace buffer empty) [ 26.690169] Kernel Offset: disabled [ 26.693780] Rebooting in 86400 seconds..