[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.578848] 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: [ 24.995898] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.588612] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.624432] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) [ 30.359964] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. executing program [ 47.658787] kasan: CONFIG_KASAN_INLINE enabled [ 47.663237] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.676187] Dumping ftrace buffer: [ 47.679695] (ftrace buffer empty) [ 47.683374] Modules linked in: [ 47.686652] CPU: 1 PID: 3760 Comm: syzkaller267666 Not tainted 4.4.125-g38f41ec #63 [ 47.694409] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.703735] task: ffff8801c8500000 task.stack: ffff8800ad2a8000 [ 47.709758] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 47.717990] RSP: 0018:ffff8800ad2afa40 EFLAGS: 00010a07 [ 47.723408] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb [ 47.730647] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 47.737888] RBP: ffff8800ad2afa50 R08: 0000000000000000 R09: 0000000000000001 [ 47.745147] R10: 0000000000000000 R11: 1ffff10015a55f26 R12: 0000000000000004 [ 47.752390] R13: 0000000000000020 R14: ffff8800ad464200 R15: dffffc0000000000 [ 47.759633] FS: 0000000002560880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 47.767837] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.773690] CR2: 0000000020e43000 CR3: 00000001cd840000 CR4: 0000000000160670 [ 47.780931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.788171] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.795408] Stack: [ 47.797524] 0000000000000246 ffff8800ad464358 ffff8800ad2afab0 ffffffff825bb221 [ 47.805492] ffff8800ad464370 ffffed0015a8c86b ffffed0015a8c86e ffff8800ad464368 [ 47.813456] dead4ead00000000 ffff8800ad464340 0000000000000000 0000000000000000 [ 47.821416] Call Trace: [ 47.823974] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 47.830450] [] sg_finish_rem_req+0x2a6/0x320 [ 47.836476] [] sg_read+0xa32/0x14d0 [ 47.841722] [] ? __check_object_size+0x154/0x35b [ 47.848111] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.854745] [] ? fsnotify+0xee0/0xee0 [ 47.860165] [] ? avc_policy_seqno+0x9/0x20 [ 47.866019] [] do_loop_readv_writev+0x141/0x1e0 [ 47.872306] [] ? security_file_permission+0x89/0x1e0 [ 47.879026] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.885661] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.892303] [] do_readv_writev+0x5dd/0x6e0 [ 47.898155] [] ? vfs_write+0x530/0x530 [ 47.903661] [] ? _raw_spin_unlock+0x2c/0x50 [ 47.909600] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 47.916584] [] ? handle_mm_fault+0x3f2/0x3190 [ 47.922695] [] ? putname+0xee/0x130 [ 47.927940] [] ? selinux_file_permission+0x348/0x460 [ 47.934658] [] vfs_readv+0x78/0xb0 [ 47.939825] [] SyS_readv+0xd9/0x240 [ 47.945069] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 47.951617] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 47.958077] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 47.964622] Code: c6 a0 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 47.991203] RIP [] __free_pages+0x21/0x90 [ 47.997088] RSP [ 48.001178] ---[ end trace 2bc3e6a981e6c726 ]--- [ 48.005906] Kernel panic - not syncing: Fatal exception [ 48.011771] Dumping ftrace buffer: [ 48.015303] (ftrace buffer empty) [ 48.018985] Kernel Offset: disabled [ 48.022581] Rebooting in 86400 seconds..