[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.877072] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.621930] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.988975] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.732117] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 25.916286] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 31.601287] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 31.693267] BUG: unable to handle kernel paging request at ffffeafffd468008 [ 31.700611] IP: [] page_remove_rmap+0x2e/0x260 [ 31.706858] PGD 0 [ 31.709097] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.714060] Dumping ftrace buffer: [ 31.717587] (ftrace buffer empty) [ 31.721273] Modules linked in: [ 31.724556] CPU: 1 PID: 3780 Comm: syz-executor533 Not tainted 4.4.149-gf76bdbd #82 [ 31.732320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.741670] task: ffff8801d04e6000 task.stack: ffff8800b5ea8000 [ 31.747698] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.756374] RSP: 0018:ffff8800b5eaf9c0 EFLAGS: 00010246 [ 31.761795] RAX: dffffc0000000000 RBX: ffffeafffd468000 RCX: 0000000000000000 [ 31.769038] RDX: 1ffffd5fffa8d001 RSI: ffffffff814bc8bf RDI: ffffeafffd468008 [ 31.776293] RBP: ffff8800b5eaf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.783545] R10: 0000000000000001 R11: ffff8801d04e6000 R12: 0000000000000001 [ 31.791743] R13: 1ffff10016bd5f3e R14: ffff8800b5f69800 R15: ffffeafffd468000 [ 31.799003] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.807200] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.813064] CR2: ffffeafffd468008 CR3: 00000000b6a13000 CR4: 00000000001606f0 [ 31.820320] Stack: [ 31.822459] ffff8800b5eafc50 0000000000000001 ffff8800b5eafa78 ffffffff8150a443 [ 31.830467] 00003fff51a001e0 00003fff51a001e0 0000000041b58ab3 ffffffff841ef837 [ 31.838443] ffffffff8150a240 00000000000004f0 ffff8800b330ae70 ffff8800b5eafa40 [ 31.846438] Call Trace: [ 31.849004] [] zap_huge_pmd+0x203/0x510 [ 31.854602] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.861154] [] unmap_single_vma+0xea3/0x1240 [ 31.867203] [] ? vm_normal_page+0x230/0x230 [ 31.873149] [] ? __put_single_page+0x60/0x60 [ 31.879193] [] unmap_vmas+0x81/0xd0 [ 31.884446] [] exit_mmap+0x1c9/0x3a0 [ 31.889797] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.896357] [] ? up_write+0x1a/0x60 [ 31.901628] [] mmput+0xf8/0x2d0 [ 31.906536] [] do_exit+0x8d8/0x26b0 [ 31.911790] [] ? file_map_prot_check+0x193/0x310 [ 31.918166] [] ? release_task.part.17+0x1200/0x1200 [ 31.924828] [] ? SyS_mprotect+0x41e/0x640 [ 31.930600] [] ? up_write+0x1a/0x60 [ 31.935853] [] ? SyS_mprotect+0x423/0x640 [ 31.941628] [] do_group_exit+0x111/0x330 [ 31.947338] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.953807] [] SyS_exit_group+0x1d/0x20 [ 31.959410] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.965964] 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 [ 31.993191] RIP [] page_remove_rmap+0x2e/0x260 [ 31.999534] RSP [ 32.003140] CR2: ffffeafffd468008 [ 32.006589] ---[ end trace 2445b3814de13935 ]--- [ 32.011325] Kernel panic - not syncing: Fatal exception [ 32.017095] Dumping ftrace buffer: [ 32.020724] (ftrace buffer empty) [ 32.024425] Kernel Offset: disabled [ 32.028076] Rebooting in 86400 seconds..