[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.066673] 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: [ 24.218577] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 24.535522] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.293916] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 25.488661] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 31.172844] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 31.259911] BUG: unable to handle kernel paging request at ffffeafff8d58008 [ 31.267517] IP: [] page_remove_rmap+0x2e/0x260 [ 31.273789] PGD 0 [ 31.276057] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.281109] Dumping ftrace buffer: [ 31.284634] (ftrace buffer empty) [ 31.288333] Modules linked in: [ 31.291725] CPU: 0 PID: 3761 Comm: syz-executor278 Not tainted 4.4.148-gf057ff9 #81 [ 31.299507] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.308852] task: ffff8800afc99800 task.stack: ffff8800af868000 [ 31.314895] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.323598] RSP: 0018:ffff8800af86f9c0 EFLAGS: 00010246 [ 31.329032] RAX: dffffc0000000000 RBX: ffffeafff8d58000 RCX: 0000000000000000 [ 31.336422] RDX: 1ffffd5fff1ab001 RSI: ffffffff814bc75f RDI: ffffeafff8d58008 [ 31.344031] RBP: ffff8800af86f9d0 R08: ffffffff85302320 R09: 0000000000000000 [ 31.351392] R10: 0000000000000001 R11: ffff8800afc99800 R12: 0000000000000001 [ 31.358653] R13: 1ffff10015f0df3e R14: ffff8801cc3c3800 R15: ffffeafff8d58000 [ 31.365912] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.374125] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.379996] CR2: ffffeafff8d58008 CR3: 00000001cbdf7000 CR4: 00000000001606f0 [ 31.387259] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.394517] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.401774] Stack: [ 31.403909] ffff8800af86fc50 0000000000000001 ffff8800af86fa78 ffffffff8150a1f3 [ 31.411967] 00003ffe356001e0 00003ffe356001e0 0000000041b58ab3 ffffffff841ef82f [ 31.420030] ffffffff81509ff0 00000000000004f0 ffff8800afcd1528 ffff8800af86fa40 [ 31.428081] Call Trace: [ 31.430659] [] zap_huge_pmd+0x203/0x510 [ 31.436271] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.442839] [] unmap_single_vma+0xea3/0x1240 [ 31.448886] [] ? vm_normal_page+0x230/0x230 [ 31.454846] [] ? __put_single_page+0x60/0x60 [ 31.460894] [] unmap_vmas+0x81/0xd0 [ 31.466160] [] exit_mmap+0x1c9/0x3a0 [ 31.471516] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.477997] [] ? kmem_cache_free+0x2b4/0x340 [ 31.484044] [] mmput+0xf8/0x2d0 [ 31.488962] [] do_exit+0x8d8/0x26b0 [ 31.494228] [] ? file_map_prot_check+0x193/0x310 [ 31.500622] [] ? release_task.part.17+0x1200/0x1200 [ 31.507342] [] ? SyS_mprotect+0x41e/0x640 [ 31.513218] [] ? up_write+0x1a/0x60 [ 31.518486] [] ? SyS_mprotect+0x423/0x640 [ 31.524274] [] do_group_exit+0x111/0x330 [ 31.529975] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.536579] [] SyS_exit_group+0x1d/0x20 [ 31.542193] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.548756] 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 [ 31.576753] RIP [] page_remove_rmap+0x2e/0x260 [ 31.583177] RSP [ 31.586790] CR2: ffffeafff8d58008 [ 31.590241] ---[ end trace 1b600edddc3b8aeb ]--- [ 31.594981] Kernel panic - not syncing: Fatal exception [ 31.600935] Dumping ftrace buffer: [ 31.604475] (ftrace buffer empty) [ 31.608181] Kernel Offset: disabled [ 31.611804] Rebooting in 86400 seconds..