[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.982676] 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: [ 19.026527] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 19.355534] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.249248] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 27.301144] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 32.693666] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 32.804313] ================================================================== [ 32.811714] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 32.818714] Read of size 8 at addr ffff8801d2a51140 by task syzkaller427997/3318 [ 32.826225] [ 32.827842] CPU: 1 PID: 3318 Comm: syzkaller427997 Not tainted 4.4.112-g3fc4284 #32 [ 32.835623] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.844959] 0000000000000000 d1467aefd7299669 ffff8801d020f9f0 ffffffff81d054ed [ 32.852985] ffffea00074a9440 ffff8801d2a51140 0000000000000000 ffff8801d2a51140 [ 32.861011] ffff8801d8444438 ffff8801d020fa28 ffffffff814fd953 ffff8801d2a51140 [ 32.869043] Call Trace: [ 32.871626] [] dump_stack+0xc1/0x124 [ 32.876981] [] print_address_description+0x73/0x260 [ 32.883631] [] kasan_report+0x285/0x370 [ 32.889236] [] ? sg_remove_request+0xf9/0x110 [ 32.895362] [] __asan_report_load8_noabort+0x14/0x20 [ 32.902107] [] sg_remove_request+0xf9/0x110 [ 32.908064] [] sg_finish_rem_req+0x295/0x340 [ 32.914112] [] sg_read+0xa21/0x1490 [ 32.919383] [] ? __check_object_size+0x154/0x35b [ 32.925780] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.932430] [] ? fsnotify+0xee0/0xee0 [ 32.937868] [] ? avc_policy_seqno+0x9/0x20 [ 32.943741] [] do_loop_readv_writev+0x141/0x1e0 [ 32.950047] [] ? security_file_permission+0x89/0x1e0 [ 32.956791] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.963448] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.970105] [] do_readv_writev+0x5dd/0x6e0 [ 32.975977] [] ? vfs_write+0x530/0x530 [ 32.981505] [] ? handle_mm_fault+0xbf5/0x3190 [ 32.987637] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.993603] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.999734] [] vfs_readv+0x78/0xb0 [ 33.004908] [] SyS_readv+0xd9/0x240 [ 33.010169] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 33.016733] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 33.023297] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 33.029856] [ 33.031470] Allocated by task 0: [ 33.034814] (stack is not available) [ 33.038505] [ 33.040118] Freed by task 0: [ 33.043115] (stack is not available) [ 33.046806] [ 33.048418] The buggy address belongs to the object at ffff8801d2a51100 [ 33.048418] which belongs to the cache fasync_cache of size 96 [ 33.061058] The buggy address is located 64 bytes inside of [ 33.061058] 96-byte region [ffff8801d2a51100, ffff8801d2a51160) [ 33.072742] The buggy address belongs to the page: [ 34.641598] PANIC: double fault, error_code: 0x0 [ 34.646410] CPU: 1 PID: 3318 Comm: syzkaller427997 Not tainted 4.4.112-g3fc4284 #32 [ 34.654170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.663492] task: ffff8800b4d0df00 task.stack: ffff8801d0208000 [ 34.669514] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 34.678271] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 34.683685] RAX: ffff8800b4d0df00 RBX: ffffea00074a9440 RCX: ffffffff8148fea0 [ 34.690923] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea00074a9440 [ 34.698160] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 34.705399] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 34.712638] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 34.719876] FS: 00000000022b3880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.728069] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.733917] CR2: ffff8800fffffff8 CR3: 00000001d2a5e000 CR4: 0000000000160670 [ 34.741159] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.748395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.755633] Stack: [ 34.757751] [ 34.759347] Call Trace: [ 34.761896] [ 34.763926] 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 [ 34.790907] Kernel panic - not syncing: Machine halted. [ 34.796242] CPU: 1 PID: 3318 Comm: syzkaller427997 Not tainted 4.4.112-g3fc4284 #32 [ 34.804000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.813408] 0000000000000000 d1467aefd7299669 ffff8801db30ce38 ffffffff81d054ed [ 34.821375] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 34.829345] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 34.837312] Call Trace: [ 34.839861] <#DF> [] dump_stack+0xc1/0x124 [ 34.845928] [] panic+0x1aa/0x388 [ 34.850912] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 34.857806] [] ? vprintk_emit+0x242/0x850 [ 34.863574] [] ? dump_page_badflags+0x1d/0x250 [ 34.869771] [] ? vprintk_emit+0x242/0x850 [ 34.875538] [] df_debug+0x2d/0x30 [ 34.880610] [] do_double_fault+0x10b/0x210 [ 34.886463] [] double_fault+0x2d/0x40 [ 34.891954] [] ? dump_page_badflags+0x180/0x250 [ 34.898240] [] ? dump_page_badflags+0x8/0x250 [ 34.904349] <> [ 34.907388] Dumping ftrace buffer: [ 34.911210] (ftrace buffer empty) [ 34.914892] Kernel Offset: disabled [ 34.918499] Rebooting in 86400 seconds..