[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.453705] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.813993] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.071531] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.905243] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 36.864798] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.15.211' (ECDSA) to the list of known hosts. [ 42.234795] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) 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 [ 42.366875] IPVS: Creating netns size=2552 id=1 executing program executing program executing program executing program executing program [ 42.412626] IPVS: Creating netns size=2552 id=2 [ 42.417070] kasan: CONFIG_KASAN_INLINE enabled [ 42.417077] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.417080] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.417084] Dumping ftrace buffer: [ 42.417088] (ftrace buffer empty) [ 42.417090] Modules linked in: [ 42.417095] CPU: 0 PID: 3329 Comm: syzkaller882048 Not tainted 4.4.107-g610c835 #12 [ 42.417098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.417101] task: ffff8801d23f4740 task.stack: ffff8801d2290000 [ 42.417114] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 42.417116] RSP: 0018:ffff8801d22979f0 EFLAGS: 00010a07 [ 42.417119] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 42.417121] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 42.417123] RBP: ffff8801d2297a00 R08: 0000000000000001 R09: 0000000000000000 [ 42.417126] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 42.417128] R13: 0000000000000020 R14: ffff8801d1198000 R15: dffffc0000000000 [ 42.417131] FS: 0000000000b0d880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 42.417133] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.417136] CR2: 000000002042afb0 CR3: 00000001d053e000 CR4: 00000000001406f0 [ 42.417140] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.417143] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.417143] Stack: [ 42.417148] 0000000000000000 ffff8801d1198158 ffff8801d2297a60 ffffffff825b8cf1 [ 42.417152] ffff8801d1198170 ffffed003a23302b ffffed003a23302e ffff8801d1198168 [ 42.417156] dead4ead00000000 ffff8801d1198140 0000000000000000 0000000000000000 [ 42.417157] Call Trace: [ 42.417166] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 42.417170] [] sg_finish_rem_req+0x2b5/0x340 [ 42.417174] [] sg_new_read.isra.18+0x39/0x3c0 [ 42.417178] [] ? sg_get_rq_mark+0x142/0x190 [ 42.417182] [] sg_read+0x8c2/0x1490 [ 42.417189] [] ? __check_object_size+0x154/0x35b [ 42.417193] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.417197] [] ? fsnotify+0xee0/0xee0 [ 42.417206] [] ? avc_policy_seqno+0x9/0x20 [ 42.417211] [] do_loop_readv_writev+0x141/0x1e0 [ 42.417215] [] ? security_file_permission+0x89/0x1e0 [ 42.417219] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.417222] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.417226] [] do_readv_writev+0x5dd/0x6e0 [ 42.417230] [] ? vfs_write+0x530/0x530 [ 42.417236] [] ? _raw_spin_unlock+0x2c/0x50 [ 42.417240] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 42.417246] [] ? handle_mm_fault+0x3f2/0x3190 [ 42.417251] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.417256] [] vfs_readv+0x78/0xb0 [ 42.417259] [] SyS_readv+0xd9/0x240 [ 42.417262] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 42.417267] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 42.417272] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 42.417322] Code: 76 ae 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 [ 42.417326] RIP [] __free_pages+0x21/0x90 [ 42.417327] RSP [ 42.417332] ---[ end trace b4fbb3688c26ad62 ]--- [ 42.417335] Kernel panic - not syncing: Fatal exception [ 42.417365] Dumping ftrace buffer: [ 42.417366] (ftrace buffer empty) [ 42.417369] Kernel Offset: disabled [ 42.778656] Rebooting in 86400 seconds..