[ 18.533272] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.787932] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.031335] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.994089] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 33.337289] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 47.451369] IPVS: Creating netns size=2552 id=1 executing program executing program executing program [ 47.509815] kasan: CONFIG_KASAN_INLINE enabled [ 47.514238] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.527081] Dumping ftrace buffer: [ 47.530587] (ftrace buffer empty) [ 47.534264] Modules linked in: [ 47.537540] CPU: 0 PID: 3658 Comm: syzkaller375103 Not tainted 4.4.120-gd63fdf6 #28 [ 47.540551] kasan: CONFIG_KASAN_INLINE enabled [ 47.549844] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.549844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.567358] task: ffff8800b0bf3000 task.stack: ffff8800b0108000 [ 47.573392] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 47.581634] RSP: 0018:ffff8800b010f9f0 EFLAGS: 00010a07 [ 47.587052] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 47.594297] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 47.601533] RBP: ffff8800b010fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 47.608862] R10: 0000000000002100 R11: 1ffff10016021f1c R12: 0000000000000004 [ 47.616101] R13: 0000000000000020 R14: ffff8801d98b0000 R15: dffffc0000000000 [ 47.623338] FS: 00007f208579f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.631531] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.637379] CR2: 0000000020e94000 CR3: 00000000b1350000 CR4: 0000000000160670 [ 47.644618] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.651857] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.659095] Stack: [ 47.661210] 0000000000000246 ffff8801d98b0158 ffff8800b010fa60 ffffffff825b8611 [ 47.669184] ffff8801d98b0170 ffffed003b31602b ffffed003b31602e ffff8801d98b0168 [ 47.677180] dead4ead00000000 ffff8801d98b0140 0000000000000000 0000000000000000 [ 47.685155] Call Trace: [ 47.687711] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 47.694170] [] sg_finish_rem_req+0x2b5/0x340 [ 47.700194] [] sg_new_read.isra.18+0x17d/0x3c0 [ 47.706391] [] sg_read+0x8bc/0x1490 [ 47.711635] [] ? __check_object_size+0x154/0x35b [ 47.718012] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.724648] [] ? fsnotify+0xee0/0xee0 [ 47.730151] [] ? avc_policy_seqno+0x9/0x20 [ 47.736013] [] do_loop_readv_writev+0x141/0x1e0 [ 47.742296] [] ? security_file_permission+0x89/0x1e0 [ 47.749017] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.755650] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 47.762281] [] do_readv_writev+0x5dd/0x6e0 [ 47.768138] [] ? vfs_write+0x530/0x530 [ 47.773644] [] ? sg_ioctl+0x29f0/0x29f0 [ 47.779233] [] ? __vfs_write+0x10b/0x450 [ 47.784913] [] ? quarantine_put+0xab/0x180 [ 47.790765] [] ? __fget+0x213/0x3b0 [ 47.796007] [] ? __fget+0x23a/0x3b0 [ 47.801247] [] ? __fget+0x47/0x3b0 [ 47.806404] [] vfs_readv+0x78/0xb0 [ 47.811560] [] SyS_readv+0xd9/0x240 [ 47.816809] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 47.823355] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 47.829815] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 47.836357] 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 [ 47.862943] RIP [] __free_pages+0x21/0x90 [ 47.868825] RSP [ 47.872431] general protection fault: 0000 [#2] [ 47.872534] ---[ end trace fada41a5d17226f4 ]--- [ 47.872537] Kernel panic - not syncing: Fatal exception [ 47.887058] PREEMPT SMP KASAN [ 47.890772] Dumping ftrace buffer: [ 47.894275] (ftrace buffer empty) [ 47.897955] Modules linked in: [ 47.901234] CPU: 1 PID: 3659 Comm: syzkaller375103 Tainted: G D 4.4.120-gd63fdf6 #28 [ 47.910208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.919527] task: ffff8801cc88c800 task.stack: ffff8801cbbc0000 [ 47.925551] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 47.933783] RSP: 0018:ffff8801cbbc79f0 EFLAGS: 00010a07 [ 47.939199] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 47.946448] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 47.953690] RBP: ffff8801cbbc7a00 R08: 0000000048000000 R09: 0000000000001e30 [ 47.960935] R10: 0000000000002100 R11: 1ffff10039778f1c R12: 0000000000000004 [ 47.968176] R13: 0000000000000020 R14: ffff8800b0a7c200 R15: dffffc0000000000 [ 47.975416] FS: 00007f208577e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 47.983608] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.989463] CR2: 00007f208577ddb8 CR3: 00000000b1350000 CR4: 0000000000160670 [ 47.996705] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.003942] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.011180] Stack: [ 48.013294] 0000000000000246 ffff8800b0a7c358 ffff8801cbbc7a60 ffffffff825b8611 [ 48.021255] ffff8800b0a7c370 ffffed001614f86b ffffed001614f86e ffff8800b0a7c368 [ 48.029222] dead4ead00000000 ffff8800b0a7c340 0000000000000000 0000000000000000 [ 48.037193] Call Trace: [ 48.039753] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 48.046213] [] sg_finish_rem_req+0x2b5/0x340 [ 48.052236] [] sg_new_read.isra.18+0x17d/0x3c0 [ 48.058432] [] sg_read+0x8bc/0x1490 [ 48.063677] [] ? __check_object_size+0x154/0x35b [ 48.070060] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 48.076696] [] ? fsnotify+0xee0/0xee0 [ 48.082112] [] ? avc_policy_seqno+0x9/0x20 [ 48.087963] [] do_loop_readv_writev+0x141/0x1e0 [ 48.094597] [] ? security_file_permission+0x89/0x1e0 [ 48.101316] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 48.107951] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 48.114582] [] do_readv_writev+0x5dd/0x6e0 [ 48.120438] [] ? vfs_write+0x530/0x530 [ 48.125944] [] ? sg_ioctl+0x29f0/0x29f0 [ 48.131533] [] ? __vfs_write+0x10b/0x450 [ 48.137210] [] ? __fget+0x47/0x3b0 [ 48.142369] [] ? avc_policy_seqno+0x9/0x20 [ 48.148218] [] ? __fget+0x213/0x3b0 [ 48.153463] [] ? __fget+0x23a/0x3b0 [ 48.158703] [] ? __fget+0x47/0x3b0 [ 48.163863] [] vfs_readv+0x78/0xb0 [ 48.169020] [] SyS_readv+0xd9/0x240 [ 48.174265] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 48.180813] [] ? finish_task_switch+0x1e7/0x4e0 [ 48.187099] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 48.193560] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 48.200104] 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 [ 48.226658] RIP [] __free_pages+0x21/0x90 [ 48.232542] RSP [ 48.236496] Dumping ftrace buffer: [ 48.240042] (ftrace buffer empty) [ 48.243726] Kernel Offset: disabled [ 48.247322] Rebooting in 86400 seconds..