[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.835750] 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: [ 22.648190] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.917215] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.488870] random: sshd: uninitialized urandom read (32 bytes read, 49 bits of entropy available) [ 23.669091] random: sshd: uninitialized urandom read (32 bytes read, 53 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 29.147438] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 29.236323] BUG: unable to handle kernel paging request at ffffeafff8d10008 [ 29.243752] IP: [] page_remove_rmap+0x2e/0x260 [ 29.250109] PGD 0 [ 29.252353] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.257403] Dumping ftrace buffer: [ 29.260916] (ftrace buffer empty) [ 29.264602] Modules linked in: [ 29.267890] CPU: 1 PID: 3840 Comm: syz-executor049 Not tainted 4.4.150-g5541782 #83 [ 29.275656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.284990] task: ffff8801d2c2e000 task.stack: ffff8801ce680000 [ 29.291033] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.299716] RSP: 0018:ffff8801ce6879c0 EFLAGS: 00010246 [ 29.305142] RAX: dffffc0000000000 RBX: ffffeafff8d10000 RCX: 0000000000000000 [ 29.312390] RDX: 1ffffd5fff1a2001 RSI: ffffffff814bceaf RDI: ffffeafff8d10008 [ 29.319637] RBP: ffff8801ce6879d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.326888] R10: 0000000000000001 R11: ffff8801d2c2e000 R12: 0000000000000001 [ 29.334142] R13: 1ffff10039cd0f3e R14: ffff8801cd450800 R15: ffffeafff8d10000 [ 29.341389] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.349590] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.355446] CR2: ffffeafff8d10008 CR3: 00000001ce535000 CR4: 00000000001606f0 [ 29.362694] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.369938] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.377182] Stack: [ 29.379305] ffff8801ce687c50 0000000000000001 ffff8801ce687a78 ffffffff8150ad13 [ 29.387317] 00003ffe344001e0 00003ffe344001e0 0000000041b58ab3 ffffffff841ef837 [ 29.395316] ffffffff8150ab10 00000000000004f0 ffff8801ce7dbf20 ffff8801ce687a40 [ 29.403381] Call Trace: [ 29.405947] [] zap_huge_pmd+0x203/0x510 [ 29.411552] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.418113] [] unmap_single_vma+0xea3/0x1240 [ 29.424151] [] ? vm_normal_page+0x280/0x280 [ 29.430233] [] ? __put_single_page+0x60/0x60 [ 29.436274] [] unmap_vmas+0x81/0xd0 [ 29.441528] [] exit_mmap+0x1c9/0x3a0 [ 29.446873] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.453348] [] ? up_write+0x1a/0x60 [ 29.458665] [] mmput+0xf8/0x2d0 [ 29.463579] [] do_exit+0x8d8/0x26b0 [ 29.468836] [] ? file_map_prot_check+0x193/0x310 [ 29.475220] [] ? release_task.part.17+0x1200/0x1200 [ 29.481861] [] ? SyS_mprotect+0x41e/0x640 [ 29.487642] [] ? up_write+0x1a/0x60 [ 29.492893] [] ? SyS_mprotect+0x423/0x640 [ 29.498670] [] do_group_exit+0x111/0x330 [ 29.504354] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.510999] [] SyS_exit_group+0x1d/0x20 [ 29.516613] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.523212] 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 [ 29.550200] RIP [] page_remove_rmap+0x2e/0x260 [ 29.556537] RSP [ 29.560140] CR2: ffffeafff8d10008 [ 29.563569] ---[ end trace 25f037d18788f2ca ]--- [ 29.568294] Kernel panic - not syncing: Fatal exception [ 29.574014] Dumping ftrace buffer: [ 29.577541] (ftrace buffer empty) [ 29.581229] Kernel Offset: disabled [ 29.584874] Rebooting in 86400 seconds..