[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.940853] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.765823] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.110556] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.849583] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 24.365514] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 29.758126] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) executing program [ 29.846892] kasan: CONFIG_KASAN_INLINE enabled [ 29.851409] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.864207] Dumping ftrace buffer: [ 29.867710] (ftrace buffer empty) [ 29.871391] Modules linked in: [ 29.874660] CPU: 0 PID: 3311 Comm: syzkaller485645 Not tainted 4.4.107-g610c835 #12 [ 29.882414] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.891731] task: ffff8800b5bf5f00 task.stack: ffff8801d0f80000 [ 29.897750] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.905970] RSP: 0018:ffff8801d0f87ab0 EFLAGS: 00010a07 [ 29.911381] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.918613] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.925847] RBP: ffff8801d0f87ac0 R08: 0000000000000001 R09: 0000000000000000 [ 29.933079] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.940313] R13: 0000000000000020 R14: ffff8801d0f1a100 R15: dffffc0000000000 [ 29.947546] FS: 000000000144a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.955735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.961580] CR2: 000000000043e5a0 CR3: 00000000b48ae000 CR4: 00000000001406f0 [ 29.968816] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.976048] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.983283] Stack: [ 29.985394] 0000000000000000 ffff8801d0f1a258 ffff8801d0f87b20 ffffffff825b8cf1 [ 29.993333] ffff8801d0f1a270 ffffed003a1e344b ffffed003a1e344e ffff8801d0f1a268 [ 30.001267] dead4ead00000000 ffff8801d0f1a240 0000000000000000 0000000000000000 [ 30.009205] Call Trace: [ 30.011756] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 30.018210] [] sg_finish_rem_req+0x2b5/0x340 [ 30.024232] [] sg_new_read.isra.18+0x39/0x3c0 [ 30.030340] [] ? sg_get_rq_mark+0x142/0x190 [ 30.036274] [] sg_read+0x8c2/0x1490 [ 30.041512] [] ? save_stack_trace+0x26/0x50 [ 30.047447] [] ? save_stack+0x43/0xd0 [ 30.052859] [] ? kasan_slab_free+0x72/0xc0 [ 30.058709] [] ? kmem_cache_free+0xc7/0x320 [ 30.065425] [] ? do_sys_open+0x23a/0x4b0 [ 30.071967] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.079464] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 30.088443] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 30.095333] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.101960] [] __vfs_read+0x103/0x440 [ 30.107370] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 30.114259] [] ? vfs_iter_write+0x2d0/0x2d0 [ 30.120800] [] ? fsnotify+0x5ad/0xee0 [ 30.127166] [] ? fsnotify+0xee0/0xee0 [ 30.132582] [] ? avc_policy_seqno+0x9/0x20 [ 30.138434] [] ? selinux_file_permission+0x348/0x460 [ 30.145151] [] ? security_file_permission+0x89/0x1e0 [ 30.151867] [] ? rw_verify_area+0x100/0x2f0 [ 30.157797] [] vfs_read+0x123/0x3a0 [ 30.163038] [] SyS_read+0xd9/0x1b0 [ 30.168190] [] ? do_sendfile+0xd30/0xd30 [ 30.173864] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.180320] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 30.186858] 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 [ 30.213097] RIP [] __free_pages+0x21/0x90 [ 30.218971] RSP [ 30.222904] ---[ end trace adae0adc28f4f438 ]--- [ 30.227640] Kernel panic - not syncing: Fatal exception [ 30.233471] Dumping ftrace buffer: [ 30.236979] (ftrace buffer empty) [ 30.240653] Kernel Offset: disabled [ 30.244242] Rebooting in 86400 seconds..