[ 16.087463] 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: [ 22.342935] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.737418] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.577709] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 23.752740] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 29.137595] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) executing program [ 29.233973] ================================================================== [ 29.241348] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.248324] Read of size 8 at addr ffff8801d34ae140 by task syzkaller224609/3314 [ 29.255821] [ 29.257430] CPU: 0 PID: 3314 Comm: syzkaller224609 Not tainted 4.4.111-g7902639 #25 [ 29.265193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.274511] 0000000000000000 930ab5f94ceb2d15 ffff8801d0a2fab0 ffffffff81d0509d [ 29.282450] ffffea00074d2b80 ffff8801d34ae140 0000000000000000 ffff8801d34ae140 [ 29.290392] ffff8801d0a80238 ffff8801d0a2fae8 ffffffff814fd433 ffff8801d34ae140 [ 29.298338] Call Trace: [ 29.300893] [] dump_stack+0xc1/0x124 [ 29.306221] [] print_address_description+0x73/0x260 [ 29.312848] [] kasan_report+0x285/0x370 [ 29.318435] [] ? sg_remove_request+0xf9/0x110 [ 29.324545] [] __asan_report_load8_noabort+0x14/0x20 [ 29.331259] [] sg_remove_request+0xf9/0x110 [ 29.337195] [] sg_finish_rem_req+0x295/0x340 [ 29.343222] [] sg_read+0xa21/0x1490 [ 29.348462] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.355090] [] ? new_slab+0x2df/0x3b0 [ 29.360503] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.367131] [] __vfs_read+0x103/0x440 [ 29.372547] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.379522] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.385460] [] ? fsnotify+0x5ad/0xee0 [ 29.390873] [] ? fsnotify+0xee0/0xee0 [ 29.396288] [] ? lockdep_init_map+0xeb/0x1690 [ 29.402423] [] ? avc_policy_seqno+0x9/0x20 [ 29.408272] [] ? selinux_file_permission+0x348/0x460 [ 29.414989] [] ? security_file_permission+0x89/0x1e0 [ 29.421707] [] ? rw_verify_area+0x100/0x2f0 [ 29.427641] [] vfs_read+0x123/0x3a0 [ 29.432880] [] SyS_read+0xd9/0x1b0 [ 29.438032] [] ? do_sendfile+0xd30/0xd30 [ 29.443708] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.450165] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.456703] [ 29.458294] Allocated by task 0: [ 29.461621] (stack is not available) [ 29.465296] [ 29.466886] Freed by task 0: [ 29.469863] (stack is not available) [ 29.473535] [ 29.475129] The buggy address belongs to the object at ffff8801d34ae100 [ 29.475129] which belongs to the cache fasync_cache of size 96 [ 29.487747] The buggy address is located 64 bytes inside of [ 29.487747] 96-byte region [ffff8801d34ae100, ffff8801d34ae160) [ 29.499410] The buggy address belongs to the page: [ 30.987309] PANIC: double fault, error_code: 0x0 [ 30.992089] CPU: 0 PID: 3314 Comm: syzkaller224609 Not tainted 4.4.111-g7902639 #25 [ 30.999854] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.009173] task: ffff8801d23d8000 task.stack: ffff8801d0a28000 [ 31.015199] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 31.023942] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.029352] RAX: ffff8801d23d8000 RBX: ffffea00074d2b80 RCX: ffffffff8148f980 [ 31.036593] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea00074d2b80 [ 31.043833] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 31.051068] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.058301] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.065543] FS: 0000000001635880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.073733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.079576] CR2: ffff8800fffffff8 CR3: 00000001d301a000 CR4: 0000000000160670 [ 31.086814] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.094050] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.101281] Stack: [ 31.103390] [ 31.104980] Call Trace: [ 31.107527] [ 31.109550] 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 61 06 [ 31.136224] Kernel panic - not syncing: Machine halted. [ 31.141552] CPU: 0 PID: 3314 Comm: syzkaller224609 Not tainted 4.4.111-g7902639 #25 [ 31.149316] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.158642] 0000000000000000 930ab5f94ceb2d15 ffff8801db20ce38 ffffffff81d0509d [ 31.166588] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 31.174538] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 31.182492] Call Trace: [ 31.185037] <#DF> [] dump_stack+0xc1/0x124 [ 31.191097] [] panic+0x1aa/0x388 [ 31.196078] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.202971] [] ? vprintk_emit+0x242/0x850 [ 31.208747] [] ? dump_page_badflags+0x1d/0x250 [ 31.214947] [] ? vprintk_emit+0x242/0x850 [ 31.220709] [] df_debug+0x2d/0x30 [ 31.225777] [] do_double_fault+0x10b/0x210 [ 31.231625] [] double_fault+0x2d/0x40 [ 31.237039] [] ? dump_page_badflags+0x180/0x250 [ 31.243328] [] ? dump_page_badflags+0x8/0x250 [ 31.249434] <> [ 31.252932] Dumping ftrace buffer: [ 31.256758] (ftrace buffer empty) [ 31.260433] Kernel Offset: disabled [ 31.264037] Rebooting in 86400 seconds..