[ 16.994321] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.662046] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.132522] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.973206] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 24.095787] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.245' (ECDSA) to the list of known hosts. [ 29.475660] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 29.572149] ================================================================== [ 29.579541] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.586524] Read of size 8 at addr ffff8800b5ad5140 by task syzkaller097143/3335 [ 29.594020] [ 29.595620] CPU: 0 PID: 3335 Comm: syzkaller097143 Not tainted 4.4.111-gc2f631b #27 [ 29.603385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.612704] 0000000000000000 704984fdaabf4e1e ffff8801d010fab0 ffffffff81d0513d [ 29.620654] ffffea0002d6b540 ffff8800b5ad5140 0000000000000000 ffff8800b5ad5140 [ 29.628598] ffff8801d303a338 ffff8801d010fae8 ffffffff814fd433 ffff8800b5ad5140 [ 29.636554] Call Trace: [ 29.639112] [] dump_stack+0xc1/0x124 [ 29.644442] [] print_address_description+0x73/0x260 [ 29.651080] [] kasan_report+0x285/0x370 [ 29.656672] [] ? sg_remove_request+0xf9/0x110 [ 29.662783] [] __asan_report_load8_noabort+0x14/0x20 [ 29.669508] [] sg_remove_request+0xf9/0x110 [ 29.675445] [] sg_finish_rem_req+0x295/0x340 [ 29.681476] [] sg_read+0xa21/0x1490 [ 29.686718] [] ? new_slab+0x24f/0x3b0 [ 29.692134] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.698767] [] ? __raw_spin_lock_init+0x1c/0x100 [ 29.705144] [] ? lockdep_init_map+0xeb/0x1690 [ 29.711257] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.717898] [] __vfs_read+0x103/0x440 [ 29.723313] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.729250] [] ? fsnotify+0x5ad/0xee0 [ 29.734673] [] ? fsnotify+0xee0/0xee0 [ 29.740090] [] ? fasync_helper+0x7a/0xb0 [ 29.745768] [] ? avc_policy_seqno+0x9/0x20 [ 29.751620] [] ? selinux_file_permission+0x348/0x460 [ 29.758353] [] ? security_file_permission+0x89/0x1e0 [ 29.765072] [] ? rw_verify_area+0x100/0x2f0 [ 29.771008] [] vfs_read+0x123/0x3a0 [ 29.776249] [] SyS_read+0xd9/0x1b0 [ 29.781412] [] ? do_sendfile+0xd30/0xd30 [ 29.787090] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.793556] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.800097] [ 29.801690] Allocated by task 0: [ 29.805019] (stack is not available) [ 29.808695] [ 29.810288] Freed by task 0: [ 29.813269] (stack is not available) [ 29.816945] [ 29.818549] The buggy address belongs to the object at ffff8800b5ad5100 [ 29.818549] which belongs to the cache fasync_cache of size 96 [ 29.831171] The buggy address is located 64 bytes inside of [ 29.831171] 96-byte region [ffff8800b5ad5100, ffff8800b5ad5160) [ 29.842844] The buggy address belongs to the page: [ 31.279254] PANIC: double fault, error_code: 0x0 [ 31.284048] CPU: 0 PID: 3335 Comm: syzkaller097143 Not tainted 4.4.111-gc2f631b #27 [ 31.291817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.301146] task: ffff8801d1afdf00 task.stack: ffff8801d0108000 [ 31.307166] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 31.315915] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.321328] RAX: ffff8801d1afdf00 RBX: ffffea0002d6b540 RCX: ffffffff8148f980 [ 31.328566] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d6b540 [ 31.335801] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 31.343038] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.350276] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.357513] FS: 000000000122a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.365704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.371552] CR2: ffff8800fffffff8 CR3: 00000001d2bbc000 CR4: 0000000000160670 [ 31.378798] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.386035] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.393272] Stack: [ 31.395384] [ 31.396976] Call Trace: [ 31.399530] [ 31.401557] 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 [ 31.428335] Kernel panic - not syncing: Machine halted. [ 31.433667] CPU: 0 PID: 3335 Comm: syzkaller097143 Not tainted 4.4.111-gc2f631b #27 [ 31.441423] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.450742] 0000000000000000 704984fdaabf4e1e ffff8801db20ce38 ffffffff81d0513d [ 31.458702] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 31.466665] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 31.474613] Call Trace: [ 31.477161] <#DF> [] dump_stack+0xc1/0x124 [ 31.483224] [] panic+0x1aa/0x388 [ 31.488205] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.495108] [] ? vprintk_emit+0x242/0x850 [ 31.500873] [] ? dump_page_badflags+0x1d/0x250 [ 31.507070] [] ? vprintk_emit+0x242/0x850 [ 31.512838] [] df_debug+0x2d/0x30 [ 31.517910] [] do_double_fault+0x10b/0x210 [ 31.523761] [] double_fault+0x2d/0x40 [ 31.529182] [] ? dump_page_badflags+0x180/0x250 [ 31.535465] [] ? dump_page_badflags+0x8/0x250 [ 31.541581] <> [ 31.544997] Dumping ftrace buffer: [ 31.548840] (ftrace buffer empty) [ 31.552527] Kernel Offset: disabled [ 31.556131] Rebooting in 86400 seconds..