[ 15.770275] 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: [ 19.975565] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.254412] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.039019] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) [ 34.990450] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 40.354287] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program [ 40.455146] ================================================================== [ 40.462570] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 40.469567] Read of size 8 at addr ffff8801d2942140 by task syzkaller084056/3324 [ 40.477075] [ 40.478675] CPU: 0 PID: 3324 Comm: syzkaller084056 Not tainted 4.4.111-g7902639 #18 [ 40.486433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.495754] 0000000000000000 3583194314895590 ffff8801d0ab7a40 ffffffff81d0509d [ 40.503723] ffffea00074a5080 ffff8801d2942140 0000000000000000 ffff8801d2942140 [ 40.511676] ffff8800b4954438 ffff8801d0ab7a78 ffffffff814fd433 ffff8801d2942140 [ 40.519649] Call Trace: [ 40.522203] [] dump_stack+0xc1/0x124 [ 40.527534] [] print_address_description+0x73/0x260 [ 40.534164] [] kasan_report+0x285/0x370 [ 40.539762] [] ? sg_remove_request+0xf9/0x110 [ 40.545882] [] __asan_report_load8_noabort+0x14/0x20 [ 40.552613] [] sg_remove_request+0xf9/0x110 [ 40.558552] [] sg_finish_rem_req+0x295/0x340 [ 40.564575] [] sg_read+0xa21/0x1490 [ 40.569827] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 40.576472] [] ? __raw_spin_lock_init+0x1c/0x100 [ 40.582852] [] ? lockdep_init_map+0xeb/0x1690 [ 40.588965] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 40.595597] [] __vfs_read+0x103/0x440 [ 40.601014] [] ? vfs_iter_write+0x2d0/0x2d0 [ 40.606961] [] ? fsnotify+0x5ad/0xee0 [ 40.612377] [] ? fsnotify+0xee0/0xee0 [ 40.617795] [] ? avc_policy_seqno+0x9/0x20 [ 40.623659] [] ? selinux_file_permission+0x348/0x460 [ 40.630390] [] ? security_file_permission+0x89/0x1e0 [ 40.637119] [] ? rw_verify_area+0x100/0x2f0 [ 40.643056] [] vfs_read+0x123/0x3a0 [ 40.648297] [] SyS_read+0xd9/0x1b0 [ 40.653459] [] ? do_sendfile+0xd30/0xd30 [ 40.659157] [] ? vmacache_update+0xfe/0x130 [ 40.665096] [] ? do_fast_syscall_32+0xd7/0x890 [ 40.671302] [] ? do_sendfile+0xd30/0xd30 [ 40.676979] [] do_fast_syscall_32+0x314/0x890 [ 40.683102] [] sysenter_flags_fixed+0xd/0x17 [ 40.689126] [ 40.690721] Allocated by task 0: [ 40.694060] (stack is not available) [ 40.697738] [ 40.699329] Freed by task 0: [ 40.702312] (stack is not available) [ 40.705999] [ 40.707594] The buggy address belongs to the object at ffff8801d2942100 [ 40.707594] which belongs to the cache fasync_cache of size 96 [ 40.720213] The buggy address is located 64 bytes inside of [ 40.720213] 96-byte region [ffff8801d2942100, ffff8801d2942160) [ 40.731880] The buggy address belongs to the page: [ 42.268843] PANIC: double fault, error_code: 0x0 [ 42.273635] CPU: 0 PID: 3324 Comm: syzkaller084056 Not tainted 4.4.111-g7902639 #18 [ 42.281396] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.290729] task: ffff8800b5270000 task.stack: ffff8801d0ab0000 [ 42.296754] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 42.305604] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 42.311018] RAX: ffff8800b5270000 RBX: ffffea00074a5080 RCX: ffffffff8148f980 [ 42.318257] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea00074a5080 [ 42.325495] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 42.332731] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 42.339969] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 42.347208] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000827e840 [ 42.355400] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 42.361251] CR2: ffff8800fffffff8 CR3: 00000001d1e74000 CR4: 0000000000160670 [ 42.368489] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.375726] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.382987] Stack: [ 42.385100] [ 42.386692] Call Trace: [ 42.389242] [ 42.391268] 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 [ 42.418091] Kernel panic - not syncing: Machine halted. [ 42.423423] CPU: 0 PID: 3324 Comm: syzkaller084056 Not tainted 4.4.111-g7902639 #18 [ 42.431182] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.440522] 0000000000000000 3583194314895590 ffff8801db20ce38 ffffffff81d0509d [ 42.448474] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 42.456436] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 42.464386] Call Trace: [ 42.466935] <#DF> [] dump_stack+0xc1/0x124 [ 42.473000] [] panic+0x1aa/0x388 [ 42.477983] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 42.484881] [] ? vprintk_emit+0x242/0x850 [ 42.490648] [] ? dump_page_badflags+0x27/0x250 [ 42.496846] [] ? vprintk_emit+0x242/0x850 [ 42.502629] [] df_debug+0x2d/0x30 [ 42.507704] [] do_double_fault+0x10b/0x210 [ 42.513555] [] double_fault+0x2d/0x40 [ 42.518990] [] ? dump_page_badflags+0x180/0x250 [ 42.525274] [] ? dump_page_badflags+0x12/0x250 [ 42.531478] <> [ 42.534541] Dumping ftrace buffer: [ 42.538386] (ftrace buffer empty) [ 42.542077] Kernel Offset: disabled [ 42.545686] Rebooting in 86400 seconds..