[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.446018] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.111070] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.463648] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.043163] random: sshd: uninitialized urandom read (32 bytes read, 50 bits of entropy available) [ 30.577456] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 36.173584] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) executing program [ 36.265915] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 36.273363] IP: [] page_remove_rmap+0x2e/0x260 [ 36.279621] PGD 0 [ 36.281982] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.286940] Dumping ftrace buffer: [ 36.290559] (ftrace buffer empty) [ 36.294250] Modules linked in: [ 36.297651] CPU: 0 PID: 3723 Comm: syz-executor144 Not tainted 4.4.150-g5541782 #83 [ 36.305428] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.314762] task: ffff8801ce34c800 task.stack: ffff8801cd7b0000 [ 36.320800] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.329676] RSP: 0018:ffff8801cd7b79c0 EFLAGS: 00010246 [ 36.335110] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 36.342380] RDX: 1ffffd5fff196001 RSI: ffffffff814bceaf RDI: ffffeafff8cb0008 [ 36.349632] RBP: ffff8801cd7b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.356882] R10: 0000000000000001 R11: ffff8801ce34c800 R12: 0000000000000001 [ 36.364131] R13: 1ffff10039af6f3e R14: ffff8801ce1d3800 R15: ffffeafff8cb0000 [ 36.371389] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.379607] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.385467] CR2: ffffeafff8cb0008 CR3: 00000001ceae9000 CR4: 00000000001606f0 [ 36.392715] Stack: [ 36.394842] ffff8801cd7b7c50 0000000000000001 ffff8801cd7b7a78 ffffffff8150ad13 [ 36.402988] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 36.410984] ffffffff8150ab10 00000000000004f0 ffff8800b1845528 ffff8801cd7b7a40 [ 36.419000] Call Trace: [ 36.421575] [] zap_huge_pmd+0x203/0x510 [ 36.427183] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.433803] [] unmap_single_vma+0xea3/0x1240 [ 36.439892] [] ? vm_normal_page+0x280/0x280 [ 36.445859] [] ? __put_single_page+0x60/0x60 [ 36.451900] [] unmap_vmas+0x81/0xd0 [ 36.457156] [] exit_mmap+0x1c9/0x3a0 [ 36.462519] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.469003] [] ? up_write+0x1a/0x60 [ 36.474269] [] mmput+0xf8/0x2d0 [ 36.479188] [] do_exit+0x8d8/0x26b0 [ 36.484460] [] ? file_map_prot_check+0x193/0x310 [ 36.490952] [] ? release_task.part.17+0x1200/0x1200 [ 36.497601] [] ? SyS_mprotect+0x41e/0x640 [ 36.503378] [] ? up_write+0x1a/0x60 [ 36.508688] [] ? SyS_mprotect+0x423/0x640 [ 36.514473] [] do_group_exit+0x111/0x330 [ 36.520160] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.526725] [] SyS_exit_group+0x1d/0x20 [ 36.532327] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.538880] 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 [ 36.565948] RIP [] page_remove_rmap+0x2e/0x260 [ 36.572279] RSP [ 36.575891] CR2: ffffeafff8cb0008 [ 36.579320] ---[ end trace 68b34b5b0f60ded8 ]--- [ 36.584051] Kernel panic - not syncing: Fatal exception [ 36.589696] Dumping ftrace buffer: [ 36.593225] (ftrace buffer empty) [ 36.596912] Kernel Offset: disabled [ 36.600515] Rebooting in 86400 seconds..