[ 16.439731] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 20.574961] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.913192] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.677844] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 21.851644] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) Warning: Permanently added '10.128.15.216' (ECDSA) to the list of known hosts. [ 27.218946] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) executing program [ 27.316268] ================================================================== [ 27.323640] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.330619] Read of size 8 at addr ffff8800b5b82140 by task syzkaller593789/3324 [ 27.338114] [ 27.339711] CPU: 0 PID: 3324 Comm: syzkaller593789 Not tainted 4.4.111-g7902639 #18 [ 27.347472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.356797] 0000000000000000 edd4a45dabe7a927 ffff8801cc9f7a40 ffffffff81d0509d [ 27.364747] ffffea0002d6e080 ffff8800b5b82140 0000000000000000 ffff8800b5b82140 [ 27.372689] ffff8801d0eb2338 ffff8801cc9f7a78 ffffffff814fd433 ffff8800b5b82140 [ 27.380642] Call Trace: [ 27.383199] [] dump_stack+0xc1/0x124 [ 27.388529] [] print_address_description+0x73/0x260 [ 27.395174] [] kasan_report+0x285/0x370 [ 27.400765] [] ? sg_remove_request+0xf9/0x110 [ 27.406878] [] __asan_report_load8_noabort+0x14/0x20 [ 27.413600] [] sg_remove_request+0xf9/0x110 [ 27.419535] [] sg_finish_rem_req+0x295/0x340 [ 27.425557] [] sg_read+0xa21/0x1490 [ 27.430797] [] ? sg_fasync+0x8d/0xb0 [ 27.436125] [] ? compat_SyS_open+0x2a/0x40 [ 27.441980] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.448613] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.455415] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.462304] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.468935] [] __vfs_read+0x103/0x440 [ 27.474353] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.480291] [] ? fsnotify+0x5ad/0xee0 [ 27.485703] [] ? fsnotify+0xee0/0xee0 [ 27.491116] [] ? compat_SyS_ioctl+0x117/0x2540 [ 27.497404] [] ? avc_policy_seqno+0x9/0x20 [ 27.503260] [] ? selinux_file_permission+0x348/0x460 [ 27.509976] [] ? security_file_permission+0x89/0x1e0 [ 27.516691] [] ? rw_verify_area+0x100/0x2f0 [ 27.522626] [] vfs_read+0x123/0x3a0 [ 27.527876] [] SyS_read+0xd9/0x1b0 [ 27.533028] [] ? do_sendfile+0xd30/0xd30 [ 27.538701] [] ? vmacache_update+0xfe/0x130 [ 27.544638] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.550835] [] ? do_sendfile+0xd30/0xd30 [ 27.556508] [] do_fast_syscall_32+0x314/0x890 [ 27.562618] [] sysenter_flags_fixed+0xd/0x17 [ 27.568638] [ 27.570234] Allocated by task 0: [ 27.573559] (stack is not available) [ 27.577233] [ 27.578823] Freed by task 0: [ 27.581801] (stack is not available) [ 27.585474] [ 27.587067] The buggy address belongs to the object at ffff8800b5b82100 [ 27.587067] which belongs to the cache fasync_cache of size 96 [ 27.599687] The buggy address is located 64 bytes inside of [ 27.599687] 96-byte region [ffff8800b5b82100, ffff8800b5b82160) [ 27.611350] The buggy address belongs to the page: [ 29.024364] PANIC: double fault, error_code: 0x0 [ 29.029131] CPU: 0 PID: 3324 Comm: syzkaller593789 Not tainted 4.4.111-g7902639 #18 [ 29.036889] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.046296] task: ffff8801d22a5f00 task.stack: ffff8801cc9f0000 [ 29.052315] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 29.061150] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.066567] RAX: ffff8801d22a5f00 RBX: ffffea0002d6e080 RCX: ffffffff8148f980 [ 29.073802] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d6e080 [ 29.081047] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 29.088297] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.095547] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 29.102810] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009549840 [ 29.111008] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.116861] CR2: ffff8800fffffff8 CR3: 00000001cfbe0000 CR4: 0000000000160670 [ 29.124103] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.131337] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.138569] Stack: [ 29.140687] [ 29.142279] Call Trace: [ 29.144831] [ 29.146859] 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 [ 29.173536] Kernel panic - not syncing: Machine halted. [ 29.178866] CPU: 0 PID: 3324 Comm: syzkaller593789 Not tainted 4.4.111-g7902639 #18 [ 29.186621] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.195939] 0000000000000000 edd4a45dabe7a927 ffff8801db20ce38 ffffffff81d0509d [ 29.203882] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 29.211828] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 29.219780] Call Trace: [ 29.222326] <#DF> [] dump_stack+0xc1/0x124 [ 29.228383] [] panic+0x1aa/0x388 [ 29.233363] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.240253] [] ? vprintk_emit+0x242/0x850 [ 29.246019] [] ? dump_page_badflags+0x27/0x250 [ 29.252217] [] ? vprintk_emit+0x242/0x850 [ 29.257983] [] df_debug+0x2d/0x30 [ 29.263050] [] do_double_fault+0x10b/0x210 [ 29.268898] [] double_fault+0x2d/0x40 [ 29.274315] [] ? dump_page_badflags+0x180/0x250 [ 29.280603] [] ? dump_page_badflags+0x12/0x250 [ 29.286794] <> [ 29.290272] Dumping ftrace buffer: [ 29.294107] (ftrace buffer empty) [ 29.297783] Kernel Offset: disabled [ 29.301478] Rebooting in 86400 seconds..