[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.118106] 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: [ 21.649513] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.854686] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.685170] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) [ 22.868674] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.229' (ECDSA) to the list of known hosts. [ 28.311017] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 28.414233] ================================================================== [ 28.421606] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.428583] Read of size 8 at addr ffff8800b459d140 by task syzkaller143673/3316 [ 28.436076] [ 28.437671] CPU: 1 PID: 3316 Comm: syzkaller143673 Not tainted 4.4.111-g3301b55 #24 [ 28.445429] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.454753] 0000000000000000 47b47b70ae78dc1f ffff8801d11ffab0 ffffffff81d0509d [ 28.462720] ffffea0002d16740 ffff8800b459d140 0000000000000000 ffff8800b459d140 [ 28.470667] ffff8800b45b0238 ffff8801d11ffae8 ffffffff814fd433 ffff8800b459d140 [ 28.478618] Call Trace: [ 28.481172] [] dump_stack+0xc1/0x124 [ 28.486501] [] print_address_description+0x73/0x260 [ 28.493141] [] kasan_report+0x285/0x370 [ 28.498739] [] ? sg_remove_request+0xf9/0x110 [ 28.504848] [] __asan_report_load8_noabort+0x14/0x20 [ 28.511566] [] sg_remove_request+0xf9/0x110 [ 28.517505] [] sg_finish_rem_req+0x295/0x340 [ 28.523529] [] sg_read+0xa21/0x1490 [ 28.528771] [] ? new_slab+0x24f/0x3b0 [ 28.534191] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.540837] [] ? __raw_spin_lock_init+0x1c/0x100 [ 28.547221] [] ? lockdep_init_map+0xeb/0x1690 [ 28.553340] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.559971] [] __vfs_read+0x103/0x440 [ 28.565384] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.571320] [] ? fsnotify+0x5ad/0xee0 [ 28.576733] [] ? fsnotify+0xee0/0xee0 [ 28.582148] [] ? fasync_helper+0x7a/0xb0 [ 28.587823] [] ? avc_policy_seqno+0x9/0x20 [ 28.593668] [] ? selinux_file_permission+0x348/0x460 [ 28.600388] [] ? security_file_permission+0x89/0x1e0 [ 28.607107] [] ? rw_verify_area+0x100/0x2f0 [ 28.613042] [] vfs_read+0x123/0x3a0 [ 28.618291] [] SyS_read+0xd9/0x1b0 [ 28.623441] [] ? do_sendfile+0xd30/0xd30 [ 28.629116] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.635576] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.642115] [ 28.643707] Allocated by task 0: [ 28.647039] (stack is not available) [ 28.650714] [ 28.652305] Freed by task 0: [ 28.655289] (stack is not available) [ 28.658963] [ 28.660558] The buggy address belongs to the object at ffff8800b459d100 [ 28.660558] which belongs to the cache fasync_cache of size 96 [ 28.673179] The buggy address is located 64 bytes inside of [ 28.673179] 96-byte region [ffff8800b459d100, ffff8800b459d160) [ 28.684852] The buggy address belongs to the page: [ 30.104288] PANIC: double fault, error_code: 0x0 [ 30.109064] CPU: 1 PID: 3316 Comm: Not tainted 4.4.111-g3301b55 #24 [ 30.115521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.124844] task: ffff8801d0fc0000 task.stack: (null) [ 30.130863] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.139609] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.145021] RAX: ffff8801d0fc0000 RBX: ffffea0002d16740 RCX: ffffffff8148f980 [ 30.152255] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0002d16740 [ 30.159490] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.166724] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.173970] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.181217] FS: 0000000001d5f880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.189411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.195255] CR2: ffff8800fffffff8 CR3: 00000000b4b9c000 CR4: 0000000000160670 [ 30.202491] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.209725] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.216960] Stack: [ 30.219072] [ 30.220666] Call Trace: [ 30.223212] [ 30.225244] 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 [ 30.251836] Kernel panic - not syncing: Machine halted. [ 30.257172] CPU: 1 PID: 3316 Comm: Not tainted 4.4.111-g3301b55 #24 [ 30.263624] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.272942] 0000000000000000 47b47b70ae78dc1f ffff8801db30ce38 ffffffff81d0509d [ 30.280897] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.288837] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.296773] Call Trace: [ 30.299318] <#DF> [] dump_stack+0xc1/0x124 [ 30.305373] [] panic+0x1aa/0x388 [ 30.310353] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.317250] [] ? vprintk_emit+0x242/0x850 [ 30.323014] [] ? dump_page_badflags+0x1d/0x250 [ 30.329212] [] ? vprintk_emit+0x242/0x850 [ 30.334973] [] df_debug+0x2d/0x30 [ 30.340040] [] do_double_fault+0x10b/0x210 [ 30.345893] [] double_fault+0x2d/0x40 [ 30.351306] [] ? dump_page_badflags+0x180/0x250 [ 30.357587] [] ? dump_page_badflags+0x8/0x250 [ 30.363694] <> [ 30.367104] Dumping ftrace buffer: [ 30.370901] (ftrace buffer empty) [ 30.374576] Kernel Offset: disabled [ 30.378168] Rebooting in 86400 seconds..