[ 15.944402] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.397113] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.705201] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.620739] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 22.786624] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 28.158688] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program [ 28.254454] ================================================================== [ 28.261850] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.268832] Read of size 8 at addr ffff8801d0d6d140 by task syzkaller775877/3312 [ 28.276331] [ 28.277940] CPU: 0 PID: 3312 Comm: syzkaller775877 Not tainted 4.4.112-gd96d95d #31 [ 28.285701] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.295030] 0000000000000000 81a243822ba7b237 ffff8801d0cf7ab0 ffffffff81d054ed [ 28.303015] ffffea0007435b40 ffff8801d0d6d140 0000000000000000 ffff8801d0d6d140 [ 28.310986] ffff8801d04c8238 ffff8801d0cf7ae8 ffffffff814fd953 ffff8801d0d6d140 [ 28.318949] Call Trace: [ 28.321507] [] dump_stack+0xc1/0x124 [ 28.326841] [] print_address_description+0x73/0x260 [ 28.333476] [] kasan_report+0x285/0x370 [ 28.339069] [] ? sg_remove_request+0xf9/0x110 [ 28.345181] [] __asan_report_load8_noabort+0x14/0x20 [ 28.351904] [] sg_remove_request+0xf9/0x110 [ 28.357844] [] sg_finish_rem_req+0x295/0x340 [ 28.363881] [] sg_read+0xa21/0x1490 [ 28.369126] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.375761] [] ? new_slab+0x2df/0x3b0 [ 28.381180] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.387813] [] __vfs_read+0x103/0x440 [ 28.393232] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.400214] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.406153] [] ? fsnotify+0x5ad/0xee0 [ 28.411569] [] ? fsnotify+0xee0/0xee0 [ 28.416986] [] ? lockdep_init_map+0xeb/0x1690 [ 28.423099] [] ? avc_policy_seqno+0x9/0x20 [ 28.428952] [] ? selinux_file_permission+0x348/0x460 [ 28.435670] [] ? security_file_permission+0x89/0x1e0 [ 28.442390] [] ? rw_verify_area+0x100/0x2f0 [ 28.448328] [] vfs_read+0x123/0x3a0 [ 28.453570] [] SyS_read+0xd9/0x1b0 [ 28.458727] [] ? do_sendfile+0xd30/0xd30 [ 28.464404] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.470867] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.477423] [ 28.479022] Allocated by task 0: [ 28.482352] (stack is not available) [ 28.486031] [ 28.487626] Freed by task 0: [ 28.490608] (stack is not available) [ 28.494286] [ 28.495885] The buggy address belongs to the object at ffff8801d0d6d100 [ 28.495885] which belongs to the cache fasync_cache of size 96 [ 28.508509] The buggy address is located 64 bytes inside of [ 28.508509] 96-byte region [ffff8801d0d6d100, ffff8801d0d6d160) [ 28.520175] The buggy address belongs to the page: [ 29.996011] PANIC: double fault, error_code: 0x0 [ 30.000793] CPU: 0 PID: 3312 Comm: syzkaller775877 Not tainted 4.4.112-gd96d95d #31 [ 30.008566] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.017890] task: ffff8801d1fc4740 task.stack: ffff8801d0cf0000 [ 30.023914] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.032665] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.038082] RAX: ffff8801d1fc4740 RBX: ffffea0007435b40 RCX: ffffffff8148fea0 [ 30.045320] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0007435b40 [ 30.052557] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.059794] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 30.067033] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 30.074272] FS: 00000000010e7880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.082465] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.088316] CR2: ffff8800fffffff8 CR3: 00000001d1c8c000 CR4: 0000000000160670 [ 30.095556] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.102797] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.110034] Stack: [ 30.112148] [ 30.113743] Call Trace: [ 30.116292] [ 30.118322] 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 [ 30.145242] Kernel panic - not syncing: Machine halted. [ 30.150575] CPU: 0 PID: 3312 Comm: syzkaller775877 Not tainted 4.4.112-gd96d95d #31 [ 30.158334] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.167656] 0000000000000000 81a243822ba7b237 ffff8801db20ce38 ffffffff81d054ed [ 30.175619] ffffffff83836a60 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 30.183584] 0000000000000000 ffff8801db20cf00 ffffffff81419dca 0000000041b58ab3 [ 30.191549] Call Trace: [ 30.194099] <#DF> [] dump_stack+0xc1/0x124 [ 30.200168] [] panic+0x1aa/0x388 [ 30.205152] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.212045] [] ? vprintk_emit+0x242/0x850 [ 30.217809] [] ? dump_page_badflags+0x1d/0x250 [ 30.224006] [] ? vprintk_emit+0x242/0x850 [ 30.229773] [] df_debug+0x2d/0x30 [ 30.234846] [] do_double_fault+0x10b/0x210 [ 30.240700] [] double_fault+0x2d/0x40 [ 30.246118] [] ? dump_page_badflags+0x180/0x250 [ 30.252405] [] ? dump_page_badflags+0x8/0x250 [ 30.258515] <> [ 30.261897] Dumping ftrace buffer: [ 30.265723] (ftrace buffer empty) [ 30.269402] Kernel Offset: disabled [ 30.273008] Rebooting in 86400 seconds..