[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.772322] 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: [ 21.175131] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.511158] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.440284] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 22.620694] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 26.387173] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. executing program [ 28.098070] ================================================================== [ 28.105479] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.112465] Read of size 8 at addr ffff8801d2da8140 by task syzkaller323300/3329 [ 28.119963] [ 28.121561] CPU: 1 PID: 3329 Comm: syzkaller323300 Not tainted 4.4.111-g3301b55 #17 [ 28.129328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.138666] 0000000000000000 ff4b5d7b0a793389 ffff8801cfddfa40 ffffffff81d0509d [ 28.146634] ffffea00074b6a00 ffff8801d2da8140 0000000000000000 ffff8801d2da8140 [ 28.154587] ffff8801d7468238 ffff8801cfddfa78 ffffffff814fd433 ffff8801d2da8140 [ 28.162549] Call Trace: [ 28.165116] [] dump_stack+0xc1/0x124 [ 28.170455] [] print_address_description+0x73/0x260 [ 28.177088] [] kasan_report+0x285/0x370 [ 28.182678] [] ? sg_remove_request+0xf9/0x110 [ 28.188796] [] __asan_report_load8_noabort+0x14/0x20 [ 28.195529] [] sg_remove_request+0xf9/0x110 [ 28.201466] [] sg_finish_rem_req+0x295/0x340 [ 28.207498] [] sg_read+0xa21/0x1490 [ 28.212741] [] ? sg_fasync+0x8d/0xb0 [ 28.218070] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.224716] [] ? __lock_is_held+0xa1/0xf0 [ 28.230489] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.237135] [] __vfs_read+0x103/0x440 [ 28.242549] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.248483] [] ? fsnotify+0x5ad/0xee0 [ 28.253916] [] ? fsnotify+0xee0/0xee0 [ 28.259340] [] ? compat_SyS_ioctl+0x117/0x2540 [ 28.265541] [] ? avc_policy_seqno+0x9/0x20 [ 28.271392] [] ? selinux_file_permission+0x348/0x460 [ 28.278109] [] ? security_file_permission+0x89/0x1e0 [ 28.284838] [] ? rw_verify_area+0x100/0x2f0 [ 28.290777] [] vfs_read+0x123/0x3a0 [ 28.296022] [] SyS_read+0xd9/0x1b0 [ 28.301195] [] ? do_sendfile+0xd30/0xd30 [ 28.306875] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.313079] [] ? do_sendfile+0xd30/0xd30 [ 28.318756] [] do_fast_syscall_32+0x314/0x890 [ 28.324867] [] sysenter_flags_fixed+0xd/0x17 [ 28.330891] [ 28.332490] Allocated by task 0: [ 28.335819] (stack is not available) [ 28.339519] [ 28.341111] Freed by task 0: [ 28.344100] (stack is not available) [ 28.347775] [ 28.349372] The buggy address belongs to the object at ffff8801d2da8100 [ 28.349372] which belongs to the cache fasync_cache of size 96 [ 28.362001] The buggy address is located 64 bytes inside of [ 28.362001] 96-byte region [ffff8801d2da8100, ffff8801d2da8160) [ 28.373689] The buggy address belongs to the page: [ 29.937309] PANIC: double fault, error_code: 0x0 [ 29.942100] CPU: 1 PID: 3329 Comm: syzkaller323300 Not tainted 4.4.111-g3301b55 #17 [ 29.949868] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.959190] task: ffff8801d1235f00 task.stack: ffff8801cfdd8000 [ 29.965212] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 29.974044] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.979461] RAX: ffff8801d1235f00 RBX: ffffea00074b6a00 RCX: ffffffff8148f980 [ 29.986701] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea00074b6a00 [ 29.993948] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 30.001200] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.008445] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.015686] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008c0a840 [ 30.023876] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.029723] CR2: ffff8800fffffff8 CR3: 00000001d393e000 CR4: 0000000000160670 [ 30.036961] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.044198] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.051434] Stack: [ 30.053547] [ 30.055138] Call Trace: [ 30.057696] [ 30.059723] Code: 00 e9 50 fd ff ff e8 9e e2 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 d4 <53> 48 89 fb 48 83 ec 08 e8 61 06 ed ff 48 8d 7b 10 48 b8 00 00 [ 30.086485] Kernel panic - not syncing: Machine halted. [ 30.091820] CPU: 1 PID: 3329 Comm: syzkaller323300 Not tainted 4.4.111-g3301b55 #17 [ 30.099586] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.108916] 0000000000000000 ff4b5d7b0a793389 ffff8801db30ce38 ffffffff81d0509d [ 30.116885] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.124852] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.132802] Call Trace: [ 30.135350] <#DF> [] dump_stack+0xc1/0x124 [ 30.141408] [] panic+0x1aa/0x388 [ 30.146393] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.153293] [] ? vprintk_emit+0x242/0x850 [ 30.159058] [] ? dump_page_badflags+0x27/0x250 [ 30.165263] [] ? vprintk_emit+0x242/0x850 [ 30.171033] [] df_debug+0x2d/0x30 [ 30.176101] [] do_double_fault+0x10b/0x210 [ 30.181955] [] double_fault+0x2d/0x40 [ 30.187373] [] ? dump_page_badflags+0x180/0x250 [ 30.193660] [] ? dump_page_badflags+0x12/0x250 [ 30.199855] <> [ 30.203360] Dumping ftrace buffer: [ 30.207200] (ftrace buffer empty) [ 30.210877] Kernel Offset: disabled [ 30.214481] Rebooting in 86400 seconds..