[ 16.701200] 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: [ 20.913321] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.161224] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.020923] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 22.202095] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 29.111766] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) executing program [ 29.210548] ================================================================== [ 29.217929] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.224909] Read of size 8 at addr ffff8801d569b140 by task syzkaller432480/3323 [ 29.232407] [ 29.234006] CPU: 0 PID: 3323 Comm: syzkaller432480 Not tainted 4.4.111-gc2f631b #27 [ 29.241773] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.251100] 0000000000000000 81e45a4d082fb119 ffff8801cfc17ab0 ffffffff81d0513d [ 29.259068] ffffea000755a6c0 ffff8801d569b140 0000000000000000 ffff8801d569b140 [ 29.267032] ffff8801d168a338 ffff8801cfc17ae8 ffffffff814fd433 ffff8801d569b140 [ 29.275002] Call Trace: [ 29.277560] [] dump_stack+0xc1/0x124 [ 29.282893] [] print_address_description+0x73/0x260 [ 29.289526] [] kasan_report+0x285/0x370 [ 29.295120] [] ? sg_remove_request+0xf9/0x110 [ 29.301229] [] __asan_report_load8_noabort+0x14/0x20 [ 29.307951] [] sg_remove_request+0xf9/0x110 [ 29.313889] [] sg_finish_rem_req+0x295/0x340 [ 29.319915] [] sg_read+0xa21/0x1490 [ 29.325158] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.331793] [] ? new_slab+0x2df/0x3b0 [ 29.337222] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.343855] [] __vfs_read+0x103/0x440 [ 29.349274] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.356252] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.362190] [] ? fsnotify+0x5ad/0xee0 [ 29.367605] [] ? fsnotify+0xee0/0xee0 [ 29.373020] [] ? lockdep_init_map+0xeb/0x1690 [ 29.379145] [] ? avc_policy_seqno+0x9/0x20 [ 29.384998] [] ? selinux_file_permission+0x348/0x460 [ 29.391726] [] ? security_file_permission+0x89/0x1e0 [ 29.398450] [] ? rw_verify_area+0x100/0x2f0 [ 29.404387] [] vfs_read+0x123/0x3a0 [ 29.409632] [] SyS_read+0xd9/0x1b0 [ 29.414788] [] ? do_sendfile+0xd30/0xd30 [ 29.420468] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.426928] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.433472] [ 29.435067] Allocated by task 0: [ 29.438398] (stack is not available) [ 29.442076] [ 29.443670] Freed by task 0: [ 29.446650] (stack is not available) [ 29.450328] [ 29.451922] The buggy address belongs to the object at ffff8801d569b100 [ 29.451922] which belongs to the cache fasync_cache of size 96 [ 29.464543] The buggy address is located 64 bytes inside of [ 29.464543] 96-byte region [ffff8801d569b100, ffff8801d569b160) [ 29.476209] The buggy address belongs to the page: [ 30.932994] PANIC: double fault, error_code: 0x0 [ 30.937772] CPU: 0 PID: 3323 Comm: syzkaller432480 Not tainted 4.4.111-gc2f631b #27 [ 30.945534] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.954855] task: ffff8800b5672f80 task.stack: ffff8801cfc10000 [ 30.960877] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.969628] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.975043] RAX: ffff8800b5672f80 RBX: ffffea000755a6c0 RCX: ffffffff8148f980 [ 30.982280] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea000755a6c0 [ 30.989524] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.996761] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.004003] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.011249] FS: 0000000000870880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.019449] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.025304] CR2: ffff8800fffffff8 CR3: 00000001d0e36000 CR4: 0000000000160670 [ 31.032542] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.039780] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.047014] Stack: [ 31.049127] [ 31.050723] Call Trace: [ 31.053274] [ 31.055300] 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 [ 31.082210] Kernel panic - not syncing: Machine halted. [ 31.087552] CPU: 0 PID: 3323 Comm: syzkaller432480 Not tainted 4.4.111-gc2f631b #27 [ 31.095310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.104630] 0000000000000000 81e45a4d082fb119 ffff8801db20ce38 ffffffff81d0513d [ 31.112588] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 31.120543] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 31.128498] Call Trace: [ 31.131050] <#DF> [] dump_stack+0xc1/0x124 [ 31.137117] [] panic+0x1aa/0x388 [ 31.142109] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.149004] [] ? vprintk_emit+0x242/0x850 [ 31.154773] [] ? dump_page_badflags+0x1d/0x250 [ 31.160970] [] ? vprintk_emit+0x242/0x850 [ 31.166738] [] df_debug+0x2d/0x30 [ 31.171809] [] do_double_fault+0x10b/0x210 [ 31.177663] [] double_fault+0x2d/0x40 [ 31.183080] [] ? dump_page_badflags+0x180/0x250 [ 31.189364] [] ? dump_page_badflags+0x8/0x250 [ 31.195470] <> [ 31.198952] Dumping ftrace buffer: [ 31.202802] (ftrace buffer empty) [ 31.206480] Kernel Offset: disabled [ 31.210086] Rebooting in 86400 seconds..