[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.420040] 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: [ 26.226993] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.655731] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.323158] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 27.511888] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 33.225926] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 33.310825] BUG: unable to handle kernel paging request at ffffeafff8b98008 [ 33.318195] IP: [] page_remove_rmap+0x2e/0x260 [ 33.324444] PGD 0 [ 33.326685] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.331658] Dumping ftrace buffer: [ 33.335169] (ftrace buffer empty) [ 33.338851] Modules linked in: [ 33.342137] CPU: 0 PID: 3762 Comm: syz-executor771 Not tainted 4.4.150-g5541782 #83 [ 33.349900] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.359352] task: ffff8801cc30b000 task.stack: ffff8801cbad0000 [ 33.365379] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.374051] RSP: 0018:ffff8801cbad79c0 EFLAGS: 00010246 [ 33.379558] RAX: dffffc0000000000 RBX: ffffeafff8b98000 RCX: 0000000000000000 [ 33.386822] RDX: 1ffffd5fff173001 RSI: ffffffff814bceaf RDI: ffffeafff8b98008 [ 33.394063] RBP: ffff8801cbad79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.401427] R10: 0000000000000001 R11: ffff8801cc30b000 R12: 0000000000000001 [ 33.408669] R13: 1ffff1003975af3e R14: ffff8801d3cdd800 R15: ffffeafff8b98000 [ 33.415922] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.424141] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.430015] CR2: ffffeafff8b98008 CR3: 00000001d12ae000 CR4: 00000000001606f0 [ 33.437264] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.444630] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.451895] Stack: [ 33.454043] ffff8801cbad7c50 0000000000000001 ffff8801cbad7a78 ffffffff8150ad13 [ 33.462027] 00003ffe2e6001e0 00003ffe2e6001e0 0000000041b58ab3 ffffffff841ef837 [ 33.470003] ffffffff8150ab10 00000000000004f0 ffff8801d0600688 ffff8801cbad7a40 [ 33.478135] Call Trace: [ 33.480701] [] zap_huge_pmd+0x203/0x510 [ 33.486421] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.492993] [] unmap_single_vma+0xea3/0x1240 [ 33.499038] [] ? vm_normal_page+0x280/0x280 [ 33.505088] [] ? __put_single_page+0x60/0x60 [ 33.511123] [] unmap_vmas+0x81/0xd0 [ 33.516451] [] exit_mmap+0x1c9/0x3a0 [ 33.521793] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.528257] [] ? up_write+0x1a/0x60 [ 33.533512] [] mmput+0xf8/0x2d0 [ 33.538415] [] do_exit+0x8d8/0x26b0 [ 33.543664] [] ? file_map_prot_check+0x193/0x310 [ 33.550043] [] ? release_task.part.17+0x1200/0x1200 [ 33.556692] [] ? SyS_mprotect+0x41e/0x640 [ 33.562461] [] ? up_write+0x1a/0x60 [ 33.567870] [] ? SyS_mprotect+0x423/0x640 [ 33.573643] [] do_group_exit+0x111/0x330 [ 33.579328] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.585899] [] SyS_exit_group+0x1d/0x20 [ 33.591511] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.598062] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 33.625352] RIP [] page_remove_rmap+0x2e/0x260 [ 33.631690] RSP [ 33.635294] CR2: ffffeafff8b98008 [ 33.638721] ---[ end trace 6ce418bd002134fc ]--- [ 33.643512] Kernel panic - not syncing: Fatal exception [ 33.649229] Dumping ftrace buffer: [ 33.652752] (ftrace buffer empty) [ 33.656437] Kernel Offset: disabled [ 33.660040] Rebooting in 86400 seconds..