[....] 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: [ 21.147282] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.602982] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.503019] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) [ 32.428663] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) [ 32.481517] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.245' (ECDSA) to the list of known hosts. executing program [ 37.910518] ================================================================== [ 37.917895] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 37.924880] Read of size 8 at addr ffff8801d17d0140 by task syzkaller930703/3333 [ 37.932375] [ 37.933970] CPU: 1 PID: 3333 Comm: syzkaller930703 Not tainted 4.4.111-g3301b55 #24 [ 37.941727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.951046] 0000000000000000 1a6b8f186588bf07 ffff8801d0b879f0 ffffffff81d0509d [ 37.959081] ffffea000745f400 ffff8801d17d0140 0000000000000000 ffff8801d17d0140 [ 37.967021] ffff8801d16e4438 ffff8801d0b87a28 ffffffff814fd433 ffff8801d17d0140 [ 37.974963] Call Trace: [ 37.977516] [] dump_stack+0xc1/0x124 [ 37.982845] [] print_address_description+0x73/0x260 [ 37.989477] [] kasan_report+0x285/0x370 [ 37.995066] [] ? sg_remove_request+0xf9/0x110 [ 38.001183] [] __asan_report_load8_noabort+0x14/0x20 [ 38.007908] [] sg_remove_request+0xf9/0x110 [ 38.013842] [] sg_finish_rem_req+0x295/0x340 [ 38.019876] [] sg_read+0xa21/0x1490 [ 38.025123] [] ? __check_object_size+0x154/0x35b [ 38.031492] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.038127] [] ? fsnotify+0xee0/0xee0 [ 38.043558] [] ? avc_policy_seqno+0x9/0x20 [ 38.049410] [] do_loop_readv_writev+0x141/0x1e0 [ 38.055693] [] ? security_file_permission+0x89/0x1e0 [ 38.062410] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.069038] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.075666] [] do_readv_writev+0x5dd/0x6e0 [ 38.081515] [] ? vfs_write+0x530/0x530 [ 38.087023] [] ? _raw_spin_unlock+0x2c/0x50 [ 38.092956] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 38.099933] [] ? handle_mm_fault+0x3f2/0x3190 [ 38.106044] [] vfs_readv+0x78/0xb0 [ 38.111199] [] SyS_readv+0xd9/0x240 [ 38.116438] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 38.122980] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 38.129524] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 38.136064] [ 38.137831] Allocated by task 0: [ 38.141158] (stack is not available) [ 38.144831] [ 38.146420] Freed by task 0: [ 38.149405] (stack is not available) [ 38.153081] [ 38.154675] The buggy address belongs to the object at ffff8801d17d0100 [ 38.154675] which belongs to the cache fasync_cache of size 96 [ 38.167295] The buggy address is located 64 bytes inside of [ 38.167295] 96-byte region [ffff8801d17d0100, ffff8801d17d0160) [ 38.178958] The buggy address belongs to the page: [ 39.630017] PANIC: double fault, error_code: 0x0 [ 39.634797] CPU: 1 PID: 3333 Comm: syzkaller930703 Not tainted 4.4.111-g3301b55 #24 [ 39.642641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.651974] task: ffff8800b54fc740 task.stack: ffff8801d0b80000 [ 39.657995] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 39.666741] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 39.672152] RAX: ffff8800b54fc740 RBX: ffffea000745f400 RCX: ffffffff8148f980 [ 39.679389] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea000745f400 [ 39.686627] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 39.693862] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 39.701102] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 39.708346] FS: 0000000001c86880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.716537] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.722383] CR2: ffff8800fffffff8 CR3: 00000001d329c000 CR4: 0000000000160670 [ 39.729621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.737553] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.744960] Stack: [ 39.747071] [ 39.748663] Call Trace: [ 39.751215] [ 39.753241] Code: 00 e9 83 fd ff ff e8 a8 e2 06 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 [ 39.779968] Kernel panic - not syncing: Machine halted. [ 39.785303] CPU: 1 PID: 3333 Comm: syzkaller930703 Not tainted 4.4.111-g3301b55 #24 [ 39.793073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.802396] 0000000000000000 1a6b8f186588bf07 ffff8801db30ce38 ffffffff81d0509d [ 39.810348] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 39.818300] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 39.826267] Call Trace: [ 39.828814] <#DF> [] dump_stack+0xc1/0x124 [ 39.834870] [] panic+0x1aa/0x388 [ 39.839852] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 39.846751] [] ? vprintk_emit+0x242/0x850 [ 39.852524] [] ? dump_page_badflags+0x1d/0x250 [ 39.858724] [] ? vprintk_emit+0x242/0x850 [ 39.864499] [] df_debug+0x2d/0x30 [ 39.869589] [] do_double_fault+0x10b/0x210 [ 39.875460] [] double_fault+0x2d/0x40 [ 39.880910] [] ? dump_page_badflags+0x180/0x250 [ 39.887205] [] ? dump_page_badflags+0x8/0x250 [ 39.893309] <> [ 39.896363] Dumping ftrace buffer: [ 39.900188] (ftrace buffer empty) [ 39.903863] Kernel Offset: disabled [ 39.907464] Rebooting in 86400 seconds..