[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.400729] 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: [ 20.306271] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.645021] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.617947] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 21.783580] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.15.211' (ECDSA) to the list of known hosts. [ 27.159123] random: nonblocking pool is initialized executing program [ 27.266384] ================================================================== [ 27.273771] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.281095] Read of size 8 at addr ffff8801d187c140 by task syzkaller571058/3312 [ 27.288587] [ 27.290182] CPU: 0 PID: 3312 Comm: syzkaller571058 Not tainted 4.4.111-gc2f631b #20 [ 27.297937] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.307254] 0000000000000000 f23a14aa072be74f ffff8801d030f970 ffffffff81d0513d [ 27.315194] ffffea0007461f00 ffff8801d187c140 0000000000000000 ffff8801d187c140 [ 27.323126] ffff8800b462a338 ffff8801d030f9a8 ffffffff814fd433 ffff8801d187c140 [ 27.331064] Call Trace: [ 27.333619] [] dump_stack+0xc1/0x124 [ 27.338950] [] print_address_description+0x73/0x260 [ 27.345577] [] kasan_report+0x285/0x370 [ 27.351167] [] ? sg_remove_request+0xf9/0x110 [ 27.357274] [] __asan_report_load8_noabort+0x14/0x20 [ 27.363988] [] sg_remove_request+0xf9/0x110 [ 27.369924] [] sg_finish_rem_req+0x295/0x340 [ 27.375946] [] sg_read+0xa21/0x1490 [ 27.381186] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.387815] [] ? fsnotify+0xee0/0xee0 [ 27.393235] [] ? avc_policy_seqno+0x9/0x20 [ 27.399086] [] do_loop_readv_writev+0x141/0x1e0 [ 27.405368] [] ? security_file_permission+0x89/0x1e0 [ 27.412082] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.418708] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.425337] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.431800] [] ? vfs_writev+0xb0/0xb0 [ 27.437910] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.443846] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.449953] [] ? dev_seq_stop+0x50/0x50 [ 27.455546] [] ? f_getown+0xb0/0xb0 [ 27.460786] [] compat_readv+0xd9/0x140 [ 27.466284] [] compat_SyS_readv+0xd8/0x1b0 [ 27.472134] [] ? SyS_pwritev+0x230/0x230 [ 27.477806] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.483997] [] ? SyS_pwritev+0x230/0x230 [ 27.489674] [] do_fast_syscall_32+0x314/0x890 [ 27.495782] [] sysenter_flags_fixed+0xd/0x17 [ 27.501797] [ 27.503389] Allocated by task 0: [ 27.506713] (stack is not available) [ 27.510389] [ 27.511978] Freed by task 0: [ 27.514956] (stack is not available) [ 27.518630] [ 27.520223] The buggy address belongs to the object at ffff8801d187c100 [ 27.520223] which belongs to the cache fasync_cache of size 96 [ 27.532841] The buggy address is located 64 bytes inside of [ 27.532841] 96-byte region [ffff8801d187c100, ffff8801d187c160) [ 27.544502] The buggy address belongs to the page: [ 28.973288] PANIC: double fault, error_code: 0x0 [ 28.978060] CPU: 0 PID: 3312 Comm: syzkaller571058 Not tainted 4.4.111-gc2f631b #20 [ 28.986250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.995833] task: ffff8800b502c740 task.stack: ffff8801d0308000 [ 29.001851] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.011562] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.016976] RAX: ffff8800b502c740 RBX: ffffea0007461f00 RCX: ffffffff8148f980 [ 29.024208] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0007461f00 [ 29.031439] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.038673] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.045904] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 29.053140] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000a02f840 [ 29.061327] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.067177] CR2: ffff8800fffffff8 CR3: 00000001d2218000 CR4: 0000000000160670 [ 29.074411] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.081905] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.089571] Stack: [ 29.091681] [ 29.093279] Call Trace: [ 29.095826] [ 29.097850] 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 [ 29.125311] Kernel panic - not syncing: Machine halted. [ 29.130638] CPU: 0 PID: 3312 Comm: syzkaller571058 Not tainted 4.4.111-gc2f631b #20 [ 29.138393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.147712] 0000000000000000 f23a14aa072be74f ffff8801db20ce38 ffffffff81d0513d [ 29.155661] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 29.163601] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 29.171545] Call Trace: [ 29.174090] <#DF> [] dump_stack+0xc1/0x124 [ 29.180176] [] panic+0x1aa/0x388 [ 29.185164] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.192062] [] ? vprintk_emit+0x242/0x850 [ 29.198430] [] ? dump_page_badflags+0x1d/0x250 [ 29.204636] [] ? vprintk_emit+0x242/0x850 [ 29.210398] [] df_debug+0x2d/0x30 [ 29.215726] [] do_double_fault+0x10b/0x210 [ 29.222447] [] double_fault+0x2d/0x40 [ 29.227861] [] ? dump_page_badflags+0x180/0x250 [ 29.234139] [] ? dump_page_badflags+0x8/0x250 [ 29.240242] <> [ 29.243900] Dumping ftrace buffer: [ 29.247743] (ftrace buffer empty) [ 29.251420] Kernel Offset: disabled [ 29.255023] Rebooting in 86400 seconds..