[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.378072] 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: [ 21.188414] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.431079] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.298539] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 22.481632] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.15.224' (ECDSA) to the list of known hosts. [ 27.849536] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program [ 27.945314] ================================================================== [ 27.952696] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.959680] Read of size 8 at addr ffff8801d2b52140 by task syzkaller023648/3319 [ 27.967183] [ 27.968796] CPU: 1 PID: 3319 Comm: syzkaller023648 Not tainted 4.4.112-g5f6325b #28 [ 27.976572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.985896] 0000000000000000 989f1ca5fc4a71eb ffff8801d097f9f0 ffffffff81d0579d [ 27.993862] ffffea00074ad480 ffff8801d2b52140 0000000000000000 ffff8801d2b52140 [ 28.001855] ffff8801d0c24438 ffff8801d097fa28 ffffffff814fd9f3 ffff8801d2b52140 [ 28.009818] Call Trace: [ 28.012378] [] dump_stack+0xc1/0x124 [ 28.017711] [] print_address_description+0x73/0x260 [ 28.024353] [] kasan_report+0x285/0x370 [ 28.029947] [] ? sg_remove_request+0xf9/0x110 [ 28.036062] [] __asan_report_load8_noabort+0x14/0x20 [ 28.042782] [] sg_remove_request+0xf9/0x110 [ 28.048722] [] sg_finish_rem_req+0x295/0x340 [ 28.054750] [] sg_read+0xa21/0x1490 [ 28.059994] [] ? __check_object_size+0x154/0x35b [ 28.066377] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.073011] [] ? fsnotify+0xee0/0xee0 [ 28.078437] [] ? avc_policy_seqno+0x9/0x20 [ 28.084297] [] do_loop_readv_writev+0x141/0x1e0 [ 28.090584] [] ? security_file_permission+0x89/0x1e0 [ 28.097565] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.104205] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.110845] [] do_readv_writev+0x5dd/0x6e0 [ 28.116699] [] ? vfs_write+0x530/0x530 [ 28.122207] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.128146] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.135133] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.141520] [] vfs_readv+0x78/0xb0 [ 28.146681] [] SyS_readv+0xd9/0x240 [ 28.151924] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.158471] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.165018] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.171565] [ 28.173169] Allocated by task 0: [ 28.176501] (stack is not available) [ 28.180183] [ 28.181777] Freed by task 0: [ 28.184759] (stack is not available) [ 28.188873] [ 28.190850] The buggy address belongs to the object at ffff8801d2b52100 [ 28.190850] which belongs to the cache fasync_cache of size 96 [ 28.203474] The buggy address is located 64 bytes inside of [ 28.203474] 96-byte region [ffff8801d2b52100, ffff8801d2b52160) [ 28.215141] The buggy address belongs to the page: [ 29.674039] PANIC: double fault, error_code: 0x0 [ 29.678818] CPU: 1 PID: 3319 Comm: syzkaller023648 Not tainted 4.4.112-g5f6325b #28 [ 29.686579] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.697558] task: ffff8800b5720000 task.stack: ffff8801d0978000 [ 29.703588] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.712348] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.717769] RAX: ffff8800b5720000 RBX: ffffea00074ad480 RCX: ffffffff8148ff40 [ 29.725011] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea00074ad480 [ 29.734077] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.742792] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 29.750033] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 29.757275] FS: 00000000017d0880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.765484] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.771333] CR2: ffff8800fffffff8 CR3: 00000001d18ee000 CR4: 0000000000160670 [ 29.778574] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.785834] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.793080] Stack: [ 29.795195] [ 29.796789] Call Trace: [ 29.799341] [ 29.801368] 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 [ 29.828251] Kernel panic - not syncing: Machine halted. [ 29.833586] CPU: 1 PID: 3319 Comm: syzkaller023648 Not tainted 4.4.112-g5f6325b #28 [ 29.841345] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.851281] 0000000000000000 989f1ca5fc4a71eb ffff8801db30ce38 ffffffff81d0579d [ 29.860043] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 29.868010] 0000000000000000 ffff8801db30cf00 ffffffff81419e6a 0000000041b58ab3 [ 29.876349] Call Trace: [ 29.879345] <#DF> [] dump_stack+0xc1/0x124 [ 29.885412] [] panic+0x1aa/0x388 [ 29.890404] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.897303] [] ? vprintk_emit+0x242/0x850 [ 29.903101] [] ? dump_page_badflags+0x1d/0x250 [ 29.909307] [] ? vprintk_emit+0x242/0x850 [ 29.915076] [] df_debug+0x2d/0x30 [ 29.920151] [] do_double_fault+0x10b/0x210 [ 29.926010] [] double_fault+0x2d/0x40 [ 29.931429] [] ? dump_page_badflags+0x180/0x250 [ 29.939019] [] ? dump_page_badflags+0x8/0x250 [ 29.946616] <> [ 29.950080] Dumping ftrace buffer: [ 29.953926] (ftrace buffer empty) [ 29.957608] Kernel Offset: disabled [ 29.961225] Rebooting in 86400 seconds..