[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.221125] 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: [ 27.558038] random: sshd: uninitialized urandom read (32 bytes read) [ 28.129492] random: sshd: uninitialized urandom read (32 bytes read) [ 28.520231] random: sshd: uninitialized urandom read (32 bytes read) [ 32.185636] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 37.906130] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.988565] BUG: unable to handle kernel paging request at ffffeafff8ee0020 [ 37.996097] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 38.002404] PGD 0 [ 38.004348] [ 38.005967] Oops: 0000 [#1] PREEMPT SMP KASAN [ 38.010437] Dumping ftrace buffer: [ 38.013949] (ftrace buffer empty) [ 38.017631] Modules linked in: [ 38.020917] CPU: 0 PID: 3795 Comm: syz-executor118 Not tainted 4.9.122-g54068d6 #26 [ 38.028879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.038209] task: ffff8801b9249800 task.stack: ffff8801d9478000 [ 38.044238] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 38.052916] RSP: 0018:ffff8801d947f948 EFLAGS: 00010246 [ 38.058336] RAX: dffffc0000000000 RBX: ffffeafff8ee0000 RCX: 0000000000000000 [ 38.065582] RDX: 1ffffd5fff1dc004 RSI: ffffffff814f5918 RDI: ffffeafff8ee0000 [ 38.072994] RBP: ffff8801d947f970 R08: 0000000000034080 R09: 0000000000000001 [ 38.080248] R10: ffff8801b9249800 R11: 0000000000000001 R12: ffff8801d947fc08 [ 38.087526] R13: ffffeafff8ee0020 R14: ffffeafff8ee0000 R15: 0000000000000001 [ 38.094777] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.103038] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.108900] CR2: ffffeafff8ee0020 CR3: 00000001c1343000 CR4: 00000000001606f0 [ 38.116201] Stack: [ 38.118331] ffffeafff8ee0020 ffff8801d947fc08 ffff8801c118b800 ffffeafff8ee0000 [ 38.126309] ffff8801cae28a50 ffff8801d947f9c8 ffffffff8154cb8f ffff8801d947fc18 [ 38.134295] ffff8801d947fc10 ffff8801d947fc88 00003ffe3b8001e0 00000001c118b000 [ 38.142279] Call Trace: [ 38.144854] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 38.150456] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 38.156584] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 38.162878] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 38.168828] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 38.174351] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 38.179710] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 38.185160] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 38.190409] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 38.195311] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 38.200571] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 38.207218] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 38.212598] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 38.218719] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 38.224665] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 38.230351] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 38.236221] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 38.241829] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 38.247528] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 38.254431] 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 [ 38.281780] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 38.288116] RSP <ffff8801d947f948> [ 38.291712] CR2: ffffeafff8ee0020 [ 38.295166] ---[ end trace 90d07f60da25ef71 ]--- [ 38.299891] Kernel panic - not syncing: Fatal exception [ 38.305536] Dumping ftrace buffer: [ 38.309048] (ftrace buffer empty) [ 38.312729] Kernel Offset: disabled [ 38.316328] Rebooting in 86400 seconds..