[ 15.358810] 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: [ 19.181358] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 19.429071] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.296956] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 20.477312] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. [ 25.890256] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 25.984401] ================================================================== [ 25.991778] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 25.998755] Read of size 8 at addr ffff8801d0cbd140 by task syzkaller775982/3316 [ 26.006253] [ 26.007846] CPU: 1 PID: 3316 Comm: syzkaller775982 Not tainted 4.4.111-g1849cd3 #26 [ 26.015602] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.024927] 0000000000000000 0dffad59ac853b50 ffff8801d0bb7ab0 ffffffff81d0509d [ 26.032868] ffffea0007432f40 ffff8801d0cbd140 0000000000000000 ffff8801d0cbd140 [ 26.040809] ffff8801d00e8238 ffff8801d0bb7ae8 ffffffff814fd433 ffff8801d0cbd140 [ 26.048752] Call Trace: [ 26.051309] [] dump_stack+0xc1/0x124 [ 26.057053] [] print_address_description+0x73/0x260 [ 26.063682] [] kasan_report+0x285/0x370 [ 26.069271] [] ? sg_remove_request+0xf9/0x110 [ 26.075380] [] __asan_report_load8_noabort+0x14/0x20 [ 26.082095] [] sg_remove_request+0xf9/0x110 [ 26.088029] [] sg_finish_rem_req+0x295/0x340 [ 26.094058] [] sg_read+0xa21/0x1490 [ 26.099298] [] ? new_slab+0x24f/0x3b0 [ 26.104712] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.111353] [] ? __raw_spin_lock_init+0x1c/0x100 [ 26.117730] [] ? lockdep_init_map+0xeb/0x1690 [ 26.123856] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.130489] [] __vfs_read+0x103/0x440 [ 26.135904] [] ? vfs_iter_write+0x2d0/0x2d0 [ 26.141843] [] ? fsnotify+0x5ad/0xee0 [ 26.147260] [] ? fsnotify+0xee0/0xee0 [ 26.152676] [] ? fasync_helper+0x7a/0xb0 [ 26.158355] [] ? avc_policy_seqno+0x9/0x20 [ 26.164296] [] ? selinux_file_permission+0x348/0x460 [ 26.171013] [] ? security_file_permission+0x89/0x1e0 [ 26.177731] [] ? rw_verify_area+0x100/0x2f0 [ 26.183670] [] vfs_read+0x123/0x3a0 [ 26.188908] [] SyS_read+0xd9/0x1b0 [ 26.194060] [] ? do_sendfile+0xd30/0xd30 [ 26.199736] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 26.206196] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 26.212737] [ 26.214336] Allocated by task 0: [ 26.217661] (stack is not available) [ 26.221334] [ 26.222923] Freed by task 0: [ 26.225904] (stack is not available) [ 26.229586] [ 26.231177] The buggy address belongs to the object at ffff8801d0cbd100 [ 26.231177] which belongs to the cache fasync_cache of size 96 [ 26.243796] The buggy address is located 64 bytes inside of [ 26.243796] 96-byte region [ffff8801d0cbd100, ffff8801d0cbd160) [ 26.255468] The buggy address belongs to the page: [ 27.686343] PANIC: double fault, error_code: 0x0 [ 27.691111] CPU: 1 PID: 3316 Comm: syzkaller775982 Not tainted 4.4.111-g1849cd3 #26 [ 27.698866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.708187] task: ffff8801d0fdc740 task.stack: ffff8801d0bb0000 [ 27.714205] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 27.722950] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 27.728361] RAX: ffff8801d0fdc740 RBX: ffffea0007432f40 RCX: ffffffff8148f980 [ 27.735597] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0007432f40 [ 27.742840] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 27.750074] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 27.757309] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 27.764544] FS: 0000000000fb0880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.772733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.778578] CR2: ffff8800fffffff8 CR3: 00000001d12d4000 CR4: 0000000000160670 [ 27.785814] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.793046] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.800276] Stack: [ 27.802387] [ 27.803976] Call Trace: [ 27.806522] [ 27.808547] 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 [ 27.835154] Kernel panic - not syncing: Machine halted. [ 27.840480] CPU: 1 PID: 3316 Comm: syzkaller775982 Not tainted 4.4.111-g1849cd3 #26 [ 27.848235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.857551] 0000000000000000 0dffad59ac853b50 ffff8801db30ce38 ffffffff81d0509d [ 27.865494] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 27.873430] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 27.881371] Call Trace: [ 27.883916] <#DF> [] dump_stack+0xc1/0x124 [ 27.889973] [] panic+0x1aa/0x388 [ 27.894954] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.901846] [] ? vprintk_emit+0x242/0x850 [ 27.907609] [] ? dump_page_badflags+0x1d/0x250 [ 27.913805] [] ? vprintk_emit+0x242/0x850 [ 27.919565] [] df_debug+0x2d/0x30 [ 27.924629] [] do_double_fault+0x10b/0x210 [ 27.930477] [] double_fault+0x2d/0x40 [ 27.935890] [] ? dump_page_badflags+0x180/0x250 [ 27.942172] [] ? dump_page_badflags+0x8/0x250 [ 27.948283] <> [ 27.951681] Dumping ftrace buffer: [ 27.955509] (ftrace buffer empty) [ 27.959185] Kernel Offset: disabled [ 27.962787] Rebooting in 86400 seconds..