[ 16.084493] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.900880] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.167189] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.004721] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 22.184839] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 28.238506] random: sshd: uninitialized urandom read (32 bytes read, 119 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 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 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 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 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 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 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 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 [ 28.711982] random: nonblocking pool is initialized [ 28.714639] kasan: CONFIG_KASAN_INLINE enabled [ 28.714650] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.714654] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.714660] Dumping ftrace buffer: [ 28.714664] (ftrace buffer empty) [ 28.714668] Modules linked in: [ 28.714675] CPU: 0 PID: 3320 Comm: syzkaller118755 Not tainted 4.4.107-g610c835 #12 [ 28.714679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.714684] task: ffff8800b5f1c740 task.stack: ffff8801d50b8000 [ 28.714701] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.714704] RSP: 0018:ffff8801d50bf9f0 EFLAGS: 00010a07 [ 28.714708] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.714712] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.714715] RBP: ffff8801d50bfa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.714718] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.714722] R13: 0000000000000020 R14: ffff8801cc8f2100 R15: dffffc0000000000 [ 28.714727] FS: 0000000001a7e880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.714730] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.714734] CR2: 0000000020a77fc0 CR3: 00000001cce75000 CR4: 00000000001406f0 [ 28.714739] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.714743] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.714744] Stack: [ 28.714751] 0000000000000000 ffff8801cc8f2258 ffff8801d50bfa60 ffffffff825b8cf1 [ 28.714758] ffff8801cc8f2270 ffffed003991e44b ffffed003991e44e ffff8801cc8f2268 [ 28.714766] dead4ead00000000 ffff8801cc8f2240 0000000000000000 0000000000000000 [ 28.714767] Call Trace: [ 28.714779] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.714786] [] sg_finish_rem_req+0x2b5/0x340 [ 28.714792] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.714798] [] ? sg_get_rq_mark+0x142/0x190 [ 28.714804] [] sg_read+0x8c2/0x1490 [ 28.714814] [] ? __check_object_size+0x154/0x35b [ 28.714821] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.714828] [] ? fsnotify+0xee0/0xee0 [ 28.714839] [] ? avc_policy_seqno+0x9/0x20 [ 28.714846] [] do_loop_readv_writev+0x141/0x1e0 [ 28.714853] [] ? security_file_permission+0x89/0x1e0 [ 28.714859] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.714866] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.714872] [] do_readv_writev+0x5dd/0x6e0 [ 28.714878] [] ? vfs_write+0x530/0x530 [ 28.714886] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.714892] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.714901] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.714908] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.714915] [] vfs_readv+0x78/0xb0 [ 28.714920] [] SyS_readv+0xd9/0x240 [ 28.714926] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.714933] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.714939] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 28.715026] 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 [ 28.715032] RIP [] __free_pages+0x21/0x90 [ 28.715034] RSP [ 28.715040] ---[ end trace e3e8dedff42c5c75 ]--- [ 28.715044] Kernel panic - not syncing: Fatal exception [ 29.067474] Dumping ftrace buffer: [ 29.070993] (ftrace buffer empty) [ 29.074669] Kernel Offset: disabled [ 29.078263] Rebooting in 86400 seconds..