[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.483663] 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: [ 25.651260] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.100278] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.821537] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 26.998422] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 32.662842] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 32.748261] BUG: unable to handle kernel paging request at ffffeafff8c68008 [ 32.755612] IP: [] page_remove_rmap+0x2e/0x260 [ 32.761858] PGD 0 [ 32.764099] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.769049] Dumping ftrace buffer: [ 32.772565] (ftrace buffer empty) [ 32.776250] Modules linked in: [ 32.779537] CPU: 1 PID: 3799 Comm: syz-executor524 Not tainted 4.4.150-g5541782 #83 [ 32.787302] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.796633] task: ffff8801ca44c800 task.stack: ffff8801d97b0000 [ 32.802665] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.811353] RSP: 0018:ffff8801d97b79c0 EFLAGS: 00010246 [ 32.816778] RAX: dffffc0000000000 RBX: ffffeafff8c68000 RCX: 0000000000000000 [ 32.824025] RDX: 1ffffd5fff18d001 RSI: ffffffff814bceaf RDI: ffffeafff8c68008 [ 32.831271] RBP: ffff8801d97b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.838515] R10: 0000000000000001 R11: ffff8801ca44c800 R12: 0000000000000001 [ 32.845762] R13: 1ffff1003b2f6f3e R14: ffff8801d1a7a800 R15: ffffeafff8c68000 [ 32.853007] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.861207] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.867065] CR2: ffffeafff8c68008 CR3: 00000001d21c7000 CR4: 00000000001606f0 [ 32.874309] Stack: [ 32.876434] ffff8801d97b7c50 0000000000000001 ffff8801d97b7a78 ffffffff8150ad13 [ 32.884421] 00003ffe31a001e0 00003ffe31a001e0 0000000041b58ab3 ffffffff841ef837 [ 32.892439] ffffffff8150ab10 00000000000004f0 ffff8801ca6d7dc0 ffff8801d97b7a40 [ 32.900464] Call Trace: [ 32.903038] [] zap_huge_pmd+0x203/0x510 [ 32.908651] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.915216] [] unmap_single_vma+0xea3/0x1240 [ 32.921255] [] ? vm_normal_page+0x280/0x280 [ 32.927204] [] ? __put_single_page+0x60/0x60 [ 32.933237] [] unmap_vmas+0x81/0xd0 [ 32.938492] [] exit_mmap+0x1c9/0x3a0 [ 32.943831] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.950299] [] ? kmem_cache_free+0x2b4/0x340 [ 32.956334] [] mmput+0xf8/0x2d0 [ 32.961238] [] do_exit+0x8d8/0x26b0 [ 32.966491] [] ? file_map_prot_check+0x193/0x310 [ 32.972871] [] ? release_task.part.17+0x1200/0x1200 [ 32.979512] [] ? SyS_mprotect+0x41e/0x640 [ 32.985295] [] ? up_write+0x1a/0x60 [ 32.990546] [] ? SyS_mprotect+0x423/0x640 [ 32.996319] [] do_group_exit+0x111/0x330 [ 33.002004] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.008470] [] SyS_exit_group+0x1d/0x20 [ 33.014069] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.020620] 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 [ 33.047543] RIP [] page_remove_rmap+0x2e/0x260 [ 33.053896] RSP [ 33.057511] CR2: ffffeafff8c68008 [ 33.060959] ---[ end trace 64e0f859ef9d9cc7 ]--- [ 33.065688] Kernel panic - not syncing: Fatal exception [ 33.071334] Dumping ftrace buffer: [ 33.074856] (ftrace buffer empty) [ 33.078546] Kernel Offset: disabled [ 33.082144] Rebooting in 86400 seconds..