[ 16.079617] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.844171] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.204722] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.986558] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) [ 22.157702] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.237' (ECDSA) to the list of known hosts. [ 27.535479] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program executing program [ 27.631897] sg_write: data in/out 36090/1 bytes for SCSI command 0x5e-- guessing data in; [ 27.631897] program syzkaller782516 not setting count and/or reply_len properly [ 27.653048] kasan: CONFIG_KASAN_INLINE enabled [ 27.657479] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.670333] Dumping ftrace buffer: [ 27.673837] (ftrace buffer empty) [ 27.677512] Modules linked in: [ 27.680785] CPU: 1 PID: 3313 Comm: syzkaller782516 Not tainted 4.4.110-g618a510 #22 [ 27.688545] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.697864] task: ffff8801d2135f00 task.stack: ffff8801d15f0000 [ 27.703889] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.712117] RSP: 0018:ffff8801d15f79f0 EFLAGS: 00010a07 [ 27.717534] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 27.724772] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 27.732010] RBP: ffff8801d15f7a00 R08: 0000000000000001 R09: 0000000000000000 [ 27.739256] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.746493] R13: 0000000000000020 R14: ffff8801d163c200 R15: dffffc0000000000 [ 27.753729] FS: 0000000001937880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.761933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.767789] CR2: 0000000020bb7000 CR3: 00000001d0a34000 CR4: 0000000000160670 [ 27.775029] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.782264] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.789500] Stack: [ 27.791613] 0000000000000000 ffff8801d163c358 ffff8801d15f7a60 ffffffff825b9c81 [ 27.799576] ffff8801d163c370 ffffed003a2c786b ffffed003a2c786e ffff8801d163c368 [ 27.807531] dead4ead00000000 ffff8801d163c340 0000000000000000 0000000000000000 [ 27.815486] Call Trace: [ 27.818045] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.824512] [] sg_finish_rem_req+0x2b5/0x340 [ 27.830535] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.836643] [] ? sg_get_rq_mark+0x142/0x190 [ 27.842581] [] sg_read+0x8c2/0x1490 [ 27.847823] [] ? __check_object_size+0x154/0x35b [ 27.854195] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.860830] [] ? fsnotify+0xee0/0xee0 [ 27.866253] [] ? avc_policy_seqno+0x9/0x20 [ 27.872106] [] do_loop_readv_writev+0x141/0x1e0 [ 27.878401] [] ? security_file_permission+0x89/0x1e0 [ 27.885130] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.891772] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.898415] [] do_readv_writev+0x5dd/0x6e0 [ 27.904271] [] ? vfs_write+0x530/0x530 [ 27.909784] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.915722] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.922701] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.928811] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.935615] [] ? __fsnotify_parent+0xbc/0x340 [ 27.941738] [] ? avc_policy_seqno+0x9/0x20 [ 27.947590] [] ? fsnotify+0x5ad/0xee0 [ 27.953011] [] vfs_readv+0x78/0xb0 [ 27.958173] [] SyS_readv+0xd9/0x240 [ 27.963415] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.969961] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.976509] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.983050] Code: 96 a4 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 [ 28.009449] RIP [] __free_pages+0x21/0x90 [ 28.015345] RSP [ 28.019601] ---[ end trace f4c587005d139fed ]--- [ 28.024358] Kernel panic - not syncing: Fatal exception [ 28.030185] Dumping ftrace buffer: [ 28.033704] (ftrace buffer empty) [ 28.037384] Kernel Offset: disabled [ 28.040978] Rebooting in 86400 seconds..