[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.784175] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.403490] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 20.734521] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.549483] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 21.741683] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.245' (ECDSA) to the list of known hosts. [ 27.129592] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program executing program executing program executing program [ 27.253699] ================================================================== [ 27.261091] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.268072] Read of size 8 at addr ffff8800b567f140 by task syzkaller495439/3322 [ 27.275566] [ 27.277167] CPU: 0 PID: 3322 Comm: syzkaller495439 Not tainted 4.4.111-g1849cd3 #26 [ 27.284923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.294250] 0000000000000000 1c040862e4989b52 ffff8801d02479f0 ffffffff81d0509d [ 27.302202] ffffea0002d59fc0 ffff8800b567f140 0000000000000000 ffff8800b567f140 [ 27.310146] ffff8800b4cf4438 ffff8801d0247a28 ffffffff814fd433 ffff8800b567f140 [ 27.318103] Call Trace: [ 27.320659] [] dump_stack+0xc1/0x124 [ 27.325987] [] print_address_description+0x73/0x260 [ 27.332617] [] kasan_report+0x285/0x370 [ 27.338214] [] ? sg_remove_request+0xf9/0x110 [ 27.344323] [] __asan_report_load8_noabort+0x14/0x20 [ 27.351041] [] sg_remove_request+0xf9/0x110 [ 27.356976] [] sg_finish_rem_req+0x295/0x340 [ 27.363011] [] sg_read+0xa21/0x1490 [ 27.368252] [] ? __check_object_size+0x154/0x35b [ 27.374626] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.381263] [] ? fsnotify+0xee0/0xee0 [ 27.386679] [] ? avc_policy_seqno+0x9/0x20 [ 27.392535] [] do_loop_readv_writev+0x141/0x1e0 [ 27.398825] [] ? security_file_permission+0x89/0x1e0 [ 27.405548] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.412181] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.418821] [] do_readv_writev+0x5dd/0x6e0 [ 27.424670] [] ? vfs_write+0x530/0x530 [ 27.430179] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.436122] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.443105] [] ? __fget+0x20b/0x3b0 [ 27.448350] [] ? __fget+0x232/0x3b0 [ 27.453593] [] ? __fget+0x47/0x3b0 [ 27.458747] [] vfs_readv+0x78/0xb0 [ 27.463901] [] SyS_readv+0xd9/0x240 [ 27.469151] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.475697] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.482242] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.488786] [ 27.490381] Allocated by task 0: [ 27.493712] (stack is not available) [ 27.497385] [ 27.498975] Freed by task 0: [ 27.501954] (stack is not available) [ 27.505626] [ 27.507218] The buggy address belongs to the object at ffff8800b567f100 [ 27.507218] which belongs to the cache fasync_cache of size 96 [ 27.519843] The buggy address is located 64 bytes inside of [ 27.519843] 96-byte region [ffff8800b567f100, ffff8800b567f160) [ 27.531506] The buggy address belongs to the page: [ 29.070932] PANIC: double fault, error_code: 0x0 [ 29.075701] CPU: 0 PID: 3322 Comm: syzkaller495439 Not tainted 4.4.111-g1849cd3 #26 [ 29.083459] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.092790] task: ffff8800b4fa97c0 task.stack: ffff8801d0240000 [ 29.098821] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.107566] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.112987] RAX: ffff8800b4fa97c0 RBX: ffffea0002d59fc0 RCX: ffffffff8148f980 [ 29.120222] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d59fc0 [ 29.127465] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.134707] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.141942] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 29.149188] FS: 00007f55f71d3700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.157382] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.163239] CR2: ffff8800fffffff8 CR3: 00000001d0a14000 CR4: 0000000000160670 [ 29.170483] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.177717] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.184954] Stack: [ 29.187065] [ 29.188656] Call Trace: [ 29.191202] [ 29.193231] 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 [ 29.219966] Kernel panic - not syncing: Machine halted. [ 29.225315] CPU: 0 PID: 3322 Comm: syzkaller495439 Not tainted 4.4.111-g1849cd3 #26 [ 29.230835] ------------[ cut here ]------------ [ 29.230857] WARNING: CPU: 1 PID: 1734 at mm/mmap.c:172 __vm_enough_memory+0x3a2/0x4b0() [ 29.247215] memory commitment underflow [ 29.247216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.260482] 0000000000000000 1c040862e4989b52 ffff8801db20ce38 ffffffff81d0509d [ 29.268540] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 29.276488] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 29.284443] Call Trace: [ 29.286988] <#DF> [] dump_stack+0xc1/0x124 [ 29.293062] [] panic+0x1aa/0x388 [ 29.298052] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.304946] [] ? vprintk_emit+0x242/0x850 [ 29.310709] [] ? dump_page_badflags+0x1d/0x250 [ 29.316906] [] ? vprintk_emit+0x242/0x850 [ 29.322670] [] df_debug+0x2d/0x30 [ 29.327739] [] do_double_fault+0x10b/0x210 [ 29.333591] [] double_fault+0x2d/0x40 [ 29.339011] [] ? dump_page_badflags+0x180/0x250 [ 29.345295] [] ? dump_page_badflags+0x8/0x250 [ 29.351402] <> [ 30.463486] Shutting down cpus with NMI [ 30.468211] Dumping ftrace buffer: [ 30.471800] (ftrace buffer empty) [ 30.475478] Kernel Offset: disabled [ 30.479079] Rebooting in 86400 seconds..