[ 15.679820] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.170392] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.473201] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.293210] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 30.783739] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. [ 36.169243] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.279518] IPVS: Creating netns size=2552 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.323391] IPVS: Creating netns size=2552 id=2 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.384026] IPVS: Creating netns size=2552 id=3 [ 36.387218] kasan: CONFIG_KASAN_INLINE enabled [ 36.387223] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.387226] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.387230] Dumping ftrace buffer: [ 36.387232] (ftrace buffer empty) [ 36.387234] Modules linked in: [ 36.387239] CPU: 0 PID: 3329 Comm: syzkaller819581 Not tainted 4.4.111-gf851888 #23 [ 36.387241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.387244] task: ffff8801d02adf00 task.stack: ffff8801d0280000 [ 36.387255] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 36.387257] RSP: 0018:ffff8801d02879f0 EFLAGS: 00010a07 [ 36.387260] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 36.387262] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 36.387264] RBP: ffff8801d0287a00 R08: 0000000000000001 R09: 0000000000000001 [ 36.387266] R10: 0000000000000000 R11: 1ffff1003a050f1c R12: 0000000000000004 [ 36.387268] R13: 0000000000000020 R14: ffff8801cce1a100 R15: dffffc0000000000 [ 36.387271] FS: 000000000132a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.387273] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.387276] CR2: 0000000020dc8000 CR3: 00000001d028a000 CR4: 0000000000160670 [ 36.387280] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.387282] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.387283] Stack: [ 36.387287] ffffffff83776469 ffff8801cce1a258 ffff8801d0287a60 ffffffff825b9ec1 [ 36.387291] ffff8801cce1a270 ffffed00399c344b ffffed00399c344e ffff8801cce1a268 [ 36.387295] dead4ead00000000 ffff8801cce1a240 0000000000000000 0000000000000000 [ 36.387296] Call Trace: [ 36.387302] [] ? retint_kernel+0x2d/0x2d [ 36.387309] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 36.387313] [] sg_finish_rem_req+0x2b5/0x340 [ 36.387317] [] sg_new_read.isra.18+0x336/0x3c0 [ 36.387320] [] sg_read+0x8c2/0x1490 [ 36.387326] [] ? __check_object_size+0x154/0x35b [ 36.387330] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.387334] [] ? fsnotify+0xee0/0xee0 [ 36.387340] [] ? avc_policy_seqno+0x9/0x20 [ 36.387345] [] do_loop_readv_writev+0x141/0x1e0 [ 36.387349] [] ? security_file_permission+0x89/0x1e0 [ 36.387353] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.387356] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.387360] [] do_readv_writev+0x5dd/0x6e0 [ 36.387364] [] ? vfs_write+0x530/0x530 [ 36.387367] [] ? _raw_spin_unlock+0x2c/0x50 [ 36.387371] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 36.387377] [] ? handle_mm_fault+0x3f2/0x3190 [ 36.387382] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.387385] [] ? __fsnotify_parent+0xbc/0x340 [ 36.387389] [] ? avc_policy_seqno+0x9/0x20 [ 36.387392] [] ? fsnotify+0x5ad/0xee0 [ 36.387396] [] vfs_readv+0x78/0xb0 [ 36.387399] [] SyS_readv+0xd9/0x240 [ 36.387402] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 36.387407] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 36.387410] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 36.387458] 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 [ 36.387462] RIP [] __free_pages+0x21/0x90 [ 36.387463] RSP [ 36.387467] ---[ end trace a9b44caf467c7349 ]--- [ 36.387470] Kernel panic - not syncing: Fatal exception [ 36.388709] Dumping ftrace buffer: [ 36.388711] (ftrace buffer empty) [ 36.388712] Kernel Offset: disabled [ 36.766505] Rebooting in 86400 seconds..