[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.643043] 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: [ 24.959049] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.460715] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.196688] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 26.379743] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 31.999064] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 32.086608] BUG: unable to handle kernel paging request at ffffeafffd2c8008 [ 32.093956] IP: [] page_remove_rmap+0x2e/0x260 [ 32.100198] PGD 0 [ 32.102437] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.107375] Dumping ftrace buffer: [ 32.110889] (ftrace buffer empty) [ 32.114571] Modules linked in: [ 32.117872] CPU: 1 PID: 3766 Comm: syz-executor324 Not tainted 4.4.149-gf76bdbd #82 [ 32.125651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.134998] task: ffff8800b072c800 task.stack: ffff8800b0b50000 [ 32.141031] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.149998] RSP: 0018:ffff8800b0b579c0 EFLAGS: 00010246 [ 32.155424] RAX: dffffc0000000000 RBX: ffffeafffd2c8000 RCX: 0000000000000000 [ 32.162677] RDX: 1ffffd5fffa59001 RSI: ffffffff814bc8bf RDI: ffffeafffd2c8008 [ 32.169926] RBP: ffff8800b0b579d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.177173] R10: 0000000000000001 R11: ffff8800b072c800 R12: 0000000000000001 [ 32.184418] R13: 1ffff1001616af3e R14: ffff8800b32c2800 R15: ffffeafffd2c8000 [ 32.191666] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.199864] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.205736] CR2: ffffeafffd2c8008 CR3: 00000000b59db000 CR4: 00000000001606f0 [ 32.212982] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.220233] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.227477] Stack: [ 32.229597] ffff8800b0b57c50 0000000000000001 ffff8800b0b57a78 ffffffff8150a443 [ 32.237577] 00003fff4b2001e0 00003fff4b2001e0 0000000041b58ab3 ffffffff841ef837 [ 32.245557] ffffffff8150a240 00000000000004f0 ffff8800b55a6b58 ffff8800b0b57a40 [ 32.253540] Call Trace: [ 32.256108] [] zap_huge_pmd+0x203/0x510 [ 32.261707] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.268263] [] unmap_single_vma+0xea3/0x1240 [ 32.274761] [] ? vm_normal_page+0x230/0x230 [ 32.280706] [] ? __put_single_page+0x60/0x60 [ 32.286739] [] unmap_vmas+0x81/0xd0 [ 32.291987] [] exit_mmap+0x1c9/0x3a0 [ 32.297331] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.303796] [] ? up_write+0x1a/0x60 [ 32.309046] [] mmput+0xf8/0x2d0 [ 32.313946] [] do_exit+0x8d8/0x26b0 [ 32.319197] [] ? file_map_prot_check+0x193/0x310 [ 32.325580] [] ? release_task.part.17+0x1200/0x1200 [ 32.332232] [] ? SyS_mprotect+0x41e/0x640 [ 32.338015] [] ? up_write+0x1a/0x60 [ 32.343281] [] ? SyS_mprotect+0x423/0x640 [ 32.349054] [] do_group_exit+0x111/0x330 [ 32.354753] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.361218] [] SyS_exit_group+0x1d/0x20 [ 32.366820] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.373457] 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 [ 32.400195] RIP [] page_remove_rmap+0x2e/0x260 [ 32.406528] RSP [ 32.410124] CR2: ffffeafffd2c8008 [ 32.413550] ---[ end trace fb44448a5e38d7da ]--- [ 32.418277] Kernel panic - not syncing: Fatal exception [ 32.423937] Dumping ftrace buffer: [ 32.427458] (ftrace buffer empty) [ 32.431141] Kernel Offset: disabled [ 32.434736] Rebooting in 86400 seconds..