[ 16.412920] 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: [ 21.830746] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.243712] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.089184] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 23.258863] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 28.641770] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program [ 28.736822] ================================================================== [ 28.744204] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.751185] Read of size 8 at addr ffff8800b40ef140 by task syzkaller930141/3323 [ 28.758687] [ 28.760282] CPU: 1 PID: 3323 Comm: syzkaller930141 Not tainted 4.4.111-g7902639 #18 [ 28.768036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.777353] 0000000000000000 52cf6ab87224babc ffff8801d0ee7a40 ffffffff81d0509d [ 28.785301] ffffea0002d03bc0 ffff8800b40ef140 0000000000000000 ffff8800b40ef140 [ 28.793243] ffff8801d1dfc438 ffff8801d0ee7a78 ffffffff814fd433 ffff8800b40ef140 [ 28.801185] Call Trace: [ 28.803744] [] dump_stack+0xc1/0x124 [ 28.809073] [] print_address_description+0x73/0x260 [ 28.815700] [] kasan_report+0x285/0x370 [ 28.821289] [] ? sg_remove_request+0xf9/0x110 [ 28.827402] [] __asan_report_load8_noabort+0x14/0x20 [ 28.834115] [] sg_remove_request+0xf9/0x110 [ 28.840051] [] sg_finish_rem_req+0x295/0x340 [ 28.846074] [] sg_read+0xa21/0x1490 [ 28.851313] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.857942] [] ? __raw_spin_lock_init+0x1c/0x100 [ 28.864310] [] ? lockdep_init_map+0xeb/0x1690 [ 28.870416] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.877046] [] __vfs_read+0x103/0x440 [ 28.882462] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.888395] [] ? fsnotify+0x5ad/0xee0 [ 28.893814] [] ? fsnotify+0xee0/0xee0 [ 28.899230] [] ? avc_policy_seqno+0x9/0x20 [ 28.905079] [] ? selinux_file_permission+0x348/0x460 [ 28.911794] [] ? security_file_permission+0x89/0x1e0 [ 28.918510] [] ? rw_verify_area+0x100/0x2f0 [ 28.924448] [] vfs_read+0x123/0x3a0 [ 28.929687] [] SyS_read+0xd9/0x1b0 [ 28.934838] [] ? do_sendfile+0xd30/0xd30 [ 28.940513] [] ? vmacache_update+0xfe/0x130 [ 28.946448] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.952643] [] ? do_sendfile+0xd30/0xd30 [ 28.958316] [] do_fast_syscall_32+0x314/0x890 [ 28.964436] [] sysenter_flags_fixed+0xd/0x17 [ 28.970453] [ 28.972046] Allocated by task 0: [ 28.975372] (stack is not available) [ 28.979043] [ 28.980634] Freed by task 0: [ 28.983615] (stack is not available) [ 28.987286] [ 28.988878] The buggy address belongs to the object at ffff8800b40ef100 [ 28.988878] which belongs to the cache fasync_cache of size 96 [ 29.001503] The buggy address is located 64 bytes inside of [ 29.001503] 96-byte region [ffff8800b40ef100, ffff8800b40ef160) [ 29.013168] The buggy address belongs to the page: [ 30.391995] PANIC: double fault, error_code: 0x0 [ 30.396764] CPU: 1 PID: 3323 Comm: syzkaller930141 Not tainted 4.4.111-g7902639 #18 [ 30.404520] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.413837] task: ffff8801d1e55f00 task.stack: ffff8801d0ee0000 [ 30.419855] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 30.428687] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.434104] RAX: ffff8801d1e55f00 RBX: ffffea0002d03bc0 RCX: ffffffff8148f980 [ 30.441345] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d03bc0 [ 30.448579] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 30.455814] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.463047] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 30.470282] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009029840 [ 30.478471] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.484316] CR2: ffff8800fffffff8 CR3: 00000001d3332000 CR4: 0000000000160670 [ 30.491551] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.498786] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.506017] Stack: [ 30.508127] [ 30.509717] Call Trace: [ 30.512261] [ 30.514283] 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 [ 30.540853] Kernel panic - not syncing: Machine halted. [ 30.546181] CPU: 1 PID: 3323 Comm: syzkaller930141 Not tainted 4.4.111-g7902639 #18 [ 30.553937] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.563254] 0000000000000000 52cf6ab87224babc ffff8801db30ce38 ffffffff81d0509d [ 30.571191] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.579128] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.587063] Call Trace: [ 30.589608] <#DF> [] dump_stack+0xc1/0x124 [ 30.595664] [] panic+0x1aa/0x388 [ 30.600643] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.607536] [] ? vprintk_emit+0x242/0x850 [ 30.613297] [] ? dump_page_badflags+0x27/0x250 [ 30.619494] [] ? vprintk_emit+0x242/0x850 [ 30.625253] [] df_debug+0x2d/0x30 [ 30.630319] [] do_double_fault+0x10b/0x210 [ 30.636165] [] double_fault+0x2d/0x40 [ 30.641578] [] ? dump_page_badflags+0x180/0x250 [ 30.647860] [] ? dump_page_badflags+0x12/0x250 [ 30.654049] <> [ 30.657479] Dumping ftrace buffer: [ 30.661311] (ftrace buffer empty) [ 30.664987] Kernel Offset: disabled [ 30.668586] Rebooting in 86400 seconds..