[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.135686] 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: [ 20.911805] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.335361] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.219434] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 26.456965] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.15.203' (ECDSA) to the list of known hosts. [ 31.817747] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 31.926870] ================================================================== [ 31.934789] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 31.941773] Read of size 8 at addr ffff8800b4432140 by task syzkaller827790/3322 [ 31.949272] [ 31.950870] CPU: 1 PID: 3322 Comm: syzkaller827790 Not tainted 4.4.112-g3fc4284 #32 [ 31.958631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.967958] 0000000000000000 b95c6dcf404eba30 ffff8801d013f9f0 ffffffff81d054ed [ 31.975932] ffffea0002d10c80 ffff8800b4432140 0000000000000000 ffff8800b4432140 [ 31.983905] ffff8800b4622338 ffff8801d013fa28 ffffffff814fd953 ffff8800b4432140 [ 31.991879] Call Trace: [ 31.994440] [] dump_stack+0xc1/0x124 [ 31.999779] [] print_address_description+0x73/0x260 [ 32.006414] [] kasan_report+0x285/0x370 [ 32.012012] [] ? sg_remove_request+0xf9/0x110 [ 32.018124] [] __asan_report_load8_noabort+0x14/0x20 [ 32.025105] [] sg_remove_request+0xf9/0x110 [ 32.031047] [] sg_finish_rem_req+0x295/0x340 [ 32.037166] [] sg_read+0xa21/0x1490 [ 32.042415] [] ? __check_object_size+0x154/0x35b [ 32.048788] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.055436] [] ? fsnotify+0xee0/0xee0 [ 32.060858] [] ? avc_policy_seqno+0x9/0x20 [ 32.066712] [] do_loop_readv_writev+0x141/0x1e0 [ 32.072999] [] ? security_file_permission+0x89/0x1e0 [ 32.079723] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.086356] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.093002] [] do_readv_writev+0x5dd/0x6e0 [ 32.098856] [] ? vfs_write+0x530/0x530 [ 32.104364] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.110305] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 32.117289] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.123403] [] ? sg_fasync+0x8d/0xb0 [ 32.128738] [] vfs_readv+0x78/0xb0 [ 32.133897] [] SyS_readv+0xd9/0x240 [ 32.139145] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 32.145699] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.152253] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 32.158798] [ 32.160398] Allocated by task 0: [ 32.163731] (stack is not available) [ 32.168024] [ 32.169621] Freed by task 0: [ 32.172721] (stack is not available) [ 32.176399] [ 32.177996] The buggy address belongs to the object at ffff8800b4432100 [ 32.177996] which belongs to the cache fasync_cache of size 96 [ 32.190619] The buggy address is located 64 bytes inside of [ 32.190619] 96-byte region [ffff8800b4432100, ffff8800b4432160) [ 32.202285] The buggy address belongs to the page: [ 33.714946] PANIC: double fault, error_code: 0x0 [ 33.719745] CPU: 1 PID: 3322 Comm: syzkaller827790 Not tainted 4.4.112-g3fc4284 #32 [ 33.727508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.737007] task: ffff8801d19d5f00 task.stack: ffff8801d0138000 [ 33.743378] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 33.752134] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 33.757549] RAX: ffff8801d19d5f00 RBX: ffffea0002d10c80 RCX: ffffffff8148fea0 [ 33.764790] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0002d10c80 [ 33.772038] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 33.779278] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 33.786529] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 33.793772] FS: 0000000002478880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.801975] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.807827] CR2: ffff8800fffffff8 CR3: 00000001d0b9a000 CR4: 0000000000160670 [ 33.815069] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.822310] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.829560] Stack: [ 33.831677] [ 33.833272] Call Trace: [ 33.836170] [ 33.838199] 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 11 01 [ 33.867094] Kernel panic - not syncing: Machine halted. [ 33.872426] CPU: 1 PID: 3322 Comm: syzkaller827790 Not tainted 4.4.112-g3fc4284 #32 [ 33.880200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.889522] 0000000000000000 b95c6dcf404eba30 ffff8801db30ce38 ffffffff81d054ed [ 33.897513] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 33.905481] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 33.913449] Call Trace: [ 33.915999] <#DF> [] dump_stack+0xc1/0x124 [ 33.922073] [] panic+0x1aa/0x388 [ 33.927058] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 33.933956] [] ? vprintk_emit+0x242/0x850 [ 33.939724] [] ? dump_page_badflags+0x1d/0x250 [ 33.945924] [] ? vprintk_emit+0x242/0x850 [ 33.951696] [] df_debug+0x2d/0x30 [ 33.956781] [] do_double_fault+0x10b/0x210 [ 33.962637] [] double_fault+0x2d/0x40 [ 33.969012] [] ? dump_page_badflags+0x180/0x250 [ 33.975309] [] ? dump_page_badflags+0x8/0x250 [ 33.981507] <> [ 33.984933] Dumping ftrace buffer: [ 33.988759] (ftrace buffer empty) [ 33.992442] Kernel Offset: disabled [ 33.996050] Rebooting in 86400 seconds..