[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.109858] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.064682] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.410936] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.161892] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) [ 22.975672] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 28.352625] random: sshd: uninitialized urandom read (32 bytes read, 103 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 [ 28.514692] kasan: CONFIG_KASAN_INLINE enabled [ 28.538737] kasan: GPF could be caused by NULL-ptr deref or user memory accesskasan: CONFIG_KASAN_INLINE enabled [ 28.543437] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.543442] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.543446] Dumping ftrace buffer: [ 28.543449] (ftrace buffer empty) [ 28.543453] Modules linked in: [ 28.543460] CPU: 1 PID: 3320 Comm: syzkaller532988 Not tainted 4.4.107-g610c835 #12 [ 28.543463] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.543467] task: ffff8800b487df00 task.stack: ffff8800b3ca8000 [ 28.543482] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.543485] RSP: 0018:ffff8800b3caf9f0 EFLAGS: 00010a07 [ 28.543489] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.543492] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 28.543496] RBP: ffff8800b3cafa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.543499] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.543502] R13: 0000000000000020 R14: ffff8801d2a6a100 R15: dffffc0000000000 [ 28.543507] FS: 00000000013c5880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.543511] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.543514] CR2: 0000000020c8d000 CR3: 00000000b45d3000 CR4: 00000000001406e0 [ 28.543521] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.543524] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.543526] Stack: [ 28.543533] 0000000000000000 ffff8801d2a6a258 ffff8800b3cafa60 ffffffff825b8cf1 [ 28.543540] ffff8801d2a6a270 ffffed003a54d44b ffffed003a54d44e ffff8801d2a6a268 [ 28.543547] dead4ead00000000 ffff8801d2a6a240 0000000000000000 0000000000000000 [ 28.543549] Call Trace: [ 28.543559] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.543566] [] sg_finish_rem_req+0x2b5/0x340 [ 28.543573] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.543578] [] ? sg_get_rq_mark+0x142/0x190 [ 28.543584] [] sg_read+0x8c2/0x1490 [ 28.543593] [] ? __check_object_size+0x154/0x35b [ 28.543600] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.543606] [] ? fsnotify+0xee0/0xee0 [ 28.543615] [] ? avc_policy_seqno+0x9/0x20 [ 28.543623] [] do_loop_readv_writev+0x141/0x1e0 [ 28.543629] [] ? security_file_permission+0x89/0x1e0 [ 28.543636] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.543643] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.543649] [] do_readv_writev+0x5dd/0x6e0 [ 28.543655] [] ? vfs_write+0x530/0x530 [ 28.543662] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.543668] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.543675] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.543682] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.543689] [] vfs_readv+0x78/0xb0 [ 28.543694] [] SyS_readv+0xd9/0x240 [ 28.543700] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.543706] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.543713] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 28.543800] 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 [ 28.543806] RIP [] __free_pages+0x21/0x90 [ 28.543808] RSP [ 28.543814] ---[ end trace 0f24c40d3a1dab5a ]--- [ 28.543817] Kernel panic - not syncing: Fatal exception [ 28.546816] Dumping ftrace buffer: [ 28.546818] (ftrace buffer empty) [ 28.546821] Kernel Offset: disabled [ 28.906102] Rebooting in 86400 seconds..