[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.004260] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.635465] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.019127] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.763074] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 23.947893] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. [ 29.340501] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) executing program [ 29.437912] ================================================================== [ 29.445302] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.452283] Read of size 8 at addr ffff8801d0dc0140 by task syzkaller662529/3325 [ 29.459787] [ 29.461385] CPU: 1 PID: 3325 Comm: syzkaller662529 Not tainted 4.4.111-g7902639 #25 [ 29.469142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.478461] 0000000000000000 0a4b43ab54e76a87 ffff8801d0b1fab0 ffffffff81d0509d [ 29.486423] ffffea0007437000 ffff8801d0dc0140 0000000000000000 ffff8801d0dc0140 [ 29.494372] ffff8801d0b58238 ffff8801d0b1fae8 ffffffff814fd433 ffff8801d0dc0140 [ 29.502322] Call Trace: [ 29.504881] [] dump_stack+0xc1/0x124 [ 29.510211] [] print_address_description+0x73/0x260 [ 29.516840] [] kasan_report+0x285/0x370 [ 29.522430] [] ? sg_remove_request+0xf9/0x110 [ 29.528537] [] __asan_report_load8_noabort+0x14/0x20 [ 29.535254] [] sg_remove_request+0xf9/0x110 [ 29.541188] [] sg_finish_rem_req+0x295/0x340 [ 29.547208] [] sg_read+0xa21/0x1490 [ 29.552450] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.559081] [] ? new_slab+0x2df/0x3b0 [ 29.564497] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.571142] [] __vfs_read+0x103/0x440 [ 29.576557] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.583535] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.589470] [] ? fsnotify+0x5ad/0xee0 [ 29.594895] [] ? fsnotify+0xee0/0xee0 [ 29.600309] [] ? lockdep_init_map+0xeb/0x1690 [ 29.606431] [] ? avc_policy_seqno+0x9/0x20 [ 29.612293] [] ? selinux_file_permission+0x348/0x460 [ 29.619012] [] ? security_file_permission+0x89/0x1e0 [ 29.625727] [] ? rw_verify_area+0x100/0x2f0 [ 29.631674] [] vfs_read+0x123/0x3a0 [ 29.636917] [] SyS_read+0xd9/0x1b0 [ 29.642071] [] ? do_sendfile+0xd30/0xd30 [ 29.647760] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.655089] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.662412] [ 29.664006] Allocated by task 0: [ 29.668115] (stack is not available) [ 29.673093] [ 29.675119] Freed by task 0: [ 29.678792] (stack is not available) [ 29.682467] [ 29.684061] The buggy address belongs to the object at ffff8801d0dc0100 [ 29.684061] which belongs to the cache fasync_cache of size 96 [ 29.696692] The buggy address is located 64 bytes inside of [ 29.696692] 96-byte region [ffff8801d0dc0100, ffff8801d0dc0160) [ 29.708358] The buggy address belongs to the page: [ 31.119368] PANIC: double fault, error_code: 0x0 [ 31.124153] CPU: 1 PID: 3325 Comm: syzkaller662529 Not tainted 4.4.111-g7902639 #25 [ 31.131911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.141231] task: ffff8801d188af80 task.stack: ffff8801d0b18000 [ 31.147253] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 31.156004] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.161418] RAX: ffff8801d188af80 RBX: ffffea0007437000 RCX: ffffffff8148f980 [ 31.168653] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0007437000 [ 31.175890] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 31.183143] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.190393] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.197634] FS: 0000000001666880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.205825] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.211672] CR2: ffff8800fffffff8 CR3: 00000001d75ce000 CR4: 0000000000160670 [ 31.218909] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.226145] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.233826] Stack: [ 31.235939] [ 31.237534] Call Trace: [ 31.240092] [ 31.242649] 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 [ 31.271891] Kernel panic - not syncing: Machine halted. [ 31.277232] CPU: 1 PID: 3325 Comm: syzkaller662529 Not tainted 4.4.111-g7902639 #25 [ 31.285435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.294765] 0000000000000000 0a4b43ab54e76a87 ffff8801db30ce38 ffffffff81d0509d [ 31.302724] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 31.310683] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 31.320541] Call Trace: [ 31.323966] <#DF> [] dump_stack+0xc1/0x124 [ 31.330554] [] panic+0x1aa/0x388 [ 31.335539] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.342445] [] ? vprintk_emit+0x242/0x850 [ 31.348207] [] ? dump_page_badflags+0x1d/0x250 [ 31.354403] [] ? vprintk_emit+0x242/0x850 [ 31.360344] [] df_debug+0x2d/0x30 [ 31.365414] [] do_double_fault+0x10b/0x210 [ 31.371267] [] double_fault+0x2d/0x40 [ 31.376683] [] ? dump_page_badflags+0x180/0x250 [ 31.382966] [] ? dump_page_badflags+0x8/0x250 [ 31.389075] <> [ 31.392864] Dumping ftrace buffer: [ 31.396711] (ftrace buffer empty) [ 31.400389] Kernel Offset: disabled [ 31.403993] Rebooting in 86400 seconds..