[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.906586] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.894432] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.548790] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.526103] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 26.694138] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. [ 32.125377] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 32.216299] kasan: CONFIG_KASAN_INLINE enabled [ 32.220752] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.234022] Dumping ftrace buffer: [ 32.237532] (ftrace buffer empty) [ 32.241211] Modules linked in: [ 32.244492] CPU: 1 PID: 3760 Comm: syzkaller349608 Not tainted 4.4.125-g38f41ec #63 [ 32.252262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.261590] task: ffff8800ad1ee000 task.stack: ffff8800acf28000 [ 32.267615] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.275851] RSP: 0018:ffff8800acf2f9e8 EFLAGS: 00010a07 [ 32.281269] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb [ 32.288511] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 32.295753] RBP: ffff8800acf2f9f8 R08: 0000000000000001 R09: 0000000000000000 [ 32.302993] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.310237] R13: 0000000000000020 R14: ffff8800adbf2100 R15: dffffc0000000000 [ 32.317484] FS: 0000000001f57880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.325681] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.331532] CR2: 0000000020ace000 CR3: 00000000b0a7c000 CR4: 0000000000160670 [ 32.338774] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.346015] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.353255] Stack: [ 32.355374] 0000000000000000 ffff8800adbf2258 ffff8800acf2fa58 ffffffff825bb221 [ 32.363355] ffff8800adbf2270 ffffed0015b7e44b ffffed0015b7e44e ffff8800adbf2268 [ 32.371338] dead4ead00000000 ffff8800adbf2240 0000000000000000 0000000000000000 [ 32.379319] Call Trace: [ 32.381880] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.388343] [] sg_finish_rem_req+0x2a6/0x320 [ 32.394372] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.401184] [] sg_new_read+0x3c/0x420 [ 32.406626] [] ? sg_get_rq_mark+0x142/0x190 [ 32.412569] [] sg_read+0x8cf/0x14d0 [ 32.417825] [] ? __check_object_size+0x154/0x35b [ 32.424213] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.430848] [] ? fsnotify+0xee0/0xee0 [ 32.436272] [] ? avc_policy_seqno+0x9/0x20 [ 32.442140] [] do_loop_readv_writev+0x141/0x1e0 [ 32.448429] [] ? security_file_permission+0x89/0x1e0 [ 32.455156] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.461794] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.468432] [] do_readv_writev+0x5dd/0x6e0 [ 32.474286] [] ? vfs_write+0x530/0x530 [ 32.479798] [] ? sg_ioctl+0x2a00/0x2a00 [ 32.485396] [] ? __vfs_write+0x10b/0x450 [ 32.491082] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.497199] [] ? putname+0xee/0x130 [ 32.502449] [] ? rw_verify_area+0x100/0x2f0 [ 32.508392] [] vfs_readv+0x78/0xb0 [ 32.513556] [] SyS_readv+0xd9/0x240 [ 32.518807] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 32.525510] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.531999] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.538572] 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 [ 32.565355] RIP [] __free_pages+0x21/0x90 [ 32.571246] RSP [ 32.574935] ---[ end trace b71d858d15b96123 ]--- [ 32.579689] Kernel panic - not syncing: Fatal exception [ 32.585079] Dumping ftrace buffer: [ 32.588590] (ftrace buffer empty) [ 32.592274] Kernel Offset: disabled [ 32.595875] Rebooting in 86400 seconds..