[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [[ 16.575015] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) ....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.972100] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.405189] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 23.263619] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 23.430221] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 28.929737] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 29.022112] ================================================================== [ 29.029513] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.036495] Read of size 8 at addr ffff8800b6045140 by task syzkaller728704/3317 [ 29.043992] [ 29.045595] CPU: 0 PID: 3317 Comm: syzkaller728704 Not tainted 4.4.111-g3301b55 #17 [ 29.053351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.062671] 0000000000000000 3c6c54ad78763099 ffff8801d0807a40 ffffffff81d0509d [ 29.070619] ffffea0002d81140 ffff8800b6045140 0000000000000000 ffff8800b6045140 [ 29.078577] ffff8801d0e14438 ffff8801d0807a78 ffffffff814fd433 ffff8800b6045140 [ 29.086522] Call Trace: [ 29.089078] [] dump_stack+0xc1/0x124 [ 29.094408] [] print_address_description+0x73/0x260 [ 29.101046] [] kasan_report+0x285/0x370 [ 29.106636] [] ? sg_remove_request+0xf9/0x110 [ 29.112745] [] __asan_report_load8_noabort+0x14/0x20 [ 29.119468] [] sg_remove_request+0xf9/0x110 [ 29.125404] [] sg_finish_rem_req+0x295/0x340 [ 29.131425] [] sg_read+0xa21/0x1490 [ 29.136667] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.143301] [] ? __raw_spin_lock_init+0x1c/0x100 [ 29.149671] [] ? lockdep_init_map+0xeb/0x1690 [ 29.155781] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.162412] [] __vfs_read+0x103/0x440 [ 29.167835] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.173770] [] ? fsnotify+0x5ad/0xee0 [ 29.179184] [] ? fsnotify+0xee0/0xee0 [ 29.184609] [] ? avc_policy_seqno+0x9/0x20 [ 29.190459] [] ? selinux_file_permission+0x348/0x460 [ 29.197183] [] ? security_file_permission+0x89/0x1e0 [ 29.203902] [] ? rw_verify_area+0x100/0x2f0 [ 29.209837] [] vfs_read+0x123/0x3a0 [ 29.215424] [] SyS_read+0xd9/0x1b0 [ 29.220585] [] ? do_sendfile+0xd30/0xd30 [ 29.226260] [] ? vmacache_update+0xfe/0x130 [ 29.232197] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.238391] [] ? do_sendfile+0xd30/0xd30 [ 29.244068] [] do_fast_syscall_32+0x314/0x890 [ 29.250179] [] sysenter_flags_fixed+0xd/0x17 [ 29.256206] [ 29.257801] Allocated by task 0: [ 29.261129] (stack is not available) [ 29.264805] [ 29.266398] Freed by task 0: [ 29.269380] (stack is not available) [ 29.273055] [ 29.274648] The buggy address belongs to the object at ffff8800b6045100 [ 29.274648] which belongs to the cache fasync_cache of size 96 [ 29.287268] The buggy address is located 64 bytes inside of [ 29.287268] 96-byte region [ffff8800b6045100, ffff8800b6045160) [ 29.298931] The buggy address belongs to the page: [ 30.706833] PANIC: double fault, error_code: 0x0 [ 30.711638] CPU: 0 PID: 3317 Comm: syzkaller728704 Not tainted 4.4.111-g3301b55 #17 [ 30.719399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.728733] task: ffff8801d1e317c0 task.stack: ffff8801d0800000 [ 30.734756] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 30.743595] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.749008] RAX: ffff8801d1e317c0 RBX: ffffea0002d81140 RCX: ffffffff8148f980 [ 30.756244] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0002d81140 [ 30.763483] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 30.770719] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.777955] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.785192] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009769840 [ 30.793405] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.799251] CR2: ffff8800fffffff8 CR3: 00000000b4dd8000 CR4: 0000000000160670 [ 30.806489] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.813723] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.820957] Stack: [ 30.823071] [ 30.824661] Call Trace: [ 30.827206] [ 30.829242] Code: 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 ed ff 48 8d 7b 10 48 b8 00 00 [ 30.855979] Kernel panic - not syncing: Machine halted. [ 30.861316] CPU: 0 PID: 3317 Comm: syzkaller728704 Not tainted 4.4.111-g3301b55 #17 [ 30.869072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.878390] 0000000000000000 3c6c54ad78763099 ffff8801db20ce38 ffffffff81d0509d [ 30.886347] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 30.894308] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.902260] Call Trace: [ 30.904806] <#DF> [] dump_stack+0xc1/0x124 [ 30.910872] [] panic+0x1aa/0x388 [ 30.915856] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.922836] [] ? vprintk_emit+0x242/0x850 [ 30.928602] [] ? dump_page_badflags+0x27/0x250 [ 30.934798] [] ? vprintk_emit+0x242/0x850 [ 30.940568] [] df_debug+0x2d/0x30 [ 30.945643] [] do_double_fault+0x10b/0x210 [ 30.951493] [] double_fault+0x2d/0x40 [ 30.956918] [] ? dump_page_badflags+0x180/0x250 [ 30.963201] [] ? dump_page_badflags+0x12/0x250 [ 30.969394] <> [ 30.972825] Dumping ftrace buffer: [ 30.976654] (ftrace buffer empty) [ 30.980338] Kernel Offset: disabled [ 30.983939] Rebooting in 86400 seconds..