[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.616531] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.004180] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.455695] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.120841] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 28.307221] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 33.775935] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 33.869946] BUG: unable to handle kernel paging request at ffffeafff8d70008 [ 33.877335] IP: [] page_remove_rmap+0x2e/0x260 [ 33.883628] PGD 0 [ 33.885981] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.891055] Dumping ftrace buffer: [ 33.894688] (ftrace buffer empty) [ 33.898385] Modules linked in: [ 33.901694] CPU: 0 PID: 3838 Comm: syz-executor616 Not tainted 4.4.148-gf057ff9 #81 [ 33.909594] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.919057] task: ffff8801d9660000 task.stack: ffff8801da3b0000 [ 33.925098] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.933867] RSP: 0018:ffff8801da3b79c0 EFLAGS: 00010246 [ 33.939299] RAX: dffffc0000000000 RBX: ffffeafff8d70000 RCX: ffffea0002dc8000 [ 33.946558] RDX: 1ffffd5fff1ae001 RSI: ffffffff814bc75f RDI: ffffeafff8d70008 [ 33.953889] RBP: ffff8801da3b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.961193] R10: 0000000000000001 R11: ffff8801d9660000 R12: 0000000000000001 [ 33.968497] R13: 1ffff1003b476f3e R14: ffff8801cf5b0800 R15: ffffeafff8d70000 [ 33.975755] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.983964] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.989949] CR2: ffffeafff8d70008 CR3: 00000001d075e000 CR4: 00000000001606f0 [ 33.997210] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.004465] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.011720] Stack: [ 34.013920] ffff8801da3b7c50 0000000000000001 ffff8801da3b7a78 ffffffff8150a1f3 [ 34.021970] 00003ffe35c001e0 00003ffe35c001e0 0000000041b58ab3 ffffffff841ef82f [ 34.030297] ffffffff81509ff0 00000000000004f0 ffff8801d1ad0c60 ffff8801da3b7a40 [ 34.038360] Call Trace: [ 34.040941] [] zap_huge_pmd+0x203/0x510 [ 34.046555] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.053170] [] unmap_single_vma+0xea3/0x1240 [ 34.059262] [] ? vm_normal_page+0x230/0x230 [ 34.065223] [] ? __put_single_page+0x60/0x60 [ 34.071268] [] unmap_vmas+0x81/0xd0 [ 34.076533] [] exit_mmap+0x1c9/0x3a0 [ 34.082001] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.088482] [] ? up_write+0x1a/0x60 [ 34.093746] [] mmput+0xf8/0x2d0 [ 34.098665] [] do_exit+0x8d8/0x26b0 [ 34.104020] [] ? file_map_prot_check+0x193/0x310 [ 34.110464] [] ? release_task.part.17+0x1200/0x1200 [ 34.117120] [] ? SyS_mprotect+0x41e/0x640 [ 34.122904] [] ? up_write+0x1a/0x60 [ 34.128217] [] ? SyS_mprotect+0x423/0x640 [ 34.134088] [] do_group_exit+0x111/0x330 [ 34.139803] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.146395] [] SyS_exit_group+0x1d/0x20 [ 34.152008] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.158569] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 34.186892] RIP [] page_remove_rmap+0x2e/0x260 [ 34.193245] RSP [ 34.196854] CR2: ffffeafff8d70008 [ 34.200293] ---[ end trace 1db02c808e556ab8 ]--- [ 34.205030] Kernel panic - not syncing: Fatal exception [ 34.210947] Dumping ftrace buffer: [ 34.214535] (ftrace buffer empty) [ 34.218287] Kernel Offset: disabled [ 34.221900] Rebooting in 86400 seconds..