[ 17.043887] random: sshd: uninitialized urandom read (32 bytes read, 31 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: [ 21.562471] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.887920] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.719266] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) [ 22.900621] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.15.218' (ECDSA) to the list of known hosts. [ 28.290926] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) executing program [ 28.394793] ================================================================== [ 28.402178] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.409165] Read of size 8 at addr ffff8800b5ef9140 by task syzkaller568282/3323 [ 28.416664] [ 28.418264] CPU: 0 PID: 3323 Comm: syzkaller568282 Not tainted 4.4.112-g52c02cf #30 [ 28.426032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.435358] 0000000000000000 c34b62d212857fe0 ffff8801d08779f0 ffffffff81d056fd [ 28.443323] ffffea0002d7be40 ffff8800b5ef9140 0000000000000000 ffff8800b5ef9140 [ 28.451292] ffff8800b44c2338 ffff8801d0877a28 ffffffff814fd953 ffff8800b5ef9140 [ 28.459256] Call Trace: [ 28.461811] [] dump_stack+0xc1/0x124 [ 28.467144] [] print_address_description+0x73/0x260 [ 28.473776] [] kasan_report+0x285/0x370 [ 28.479373] [] ? sg_remove_request+0xf9/0x110 [ 28.485489] [] __asan_report_load8_noabort+0x14/0x20 [ 28.492223] [] sg_remove_request+0xf9/0x110 [ 28.498164] [] sg_finish_rem_req+0x295/0x340 [ 28.504193] [] sg_read+0xa21/0x1490 [ 28.509441] [] ? __check_object_size+0x154/0x35b [ 28.515828] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.522478] [] ? fsnotify+0xee0/0xee0 [ 28.527914] [] ? avc_policy_seqno+0x9/0x20 [ 28.533770] [] do_loop_readv_writev+0x141/0x1e0 [ 28.540073] [] ? security_file_permission+0x89/0x1e0 [ 28.546795] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.553432] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.560074] [] do_readv_writev+0x5dd/0x6e0 [ 28.565929] [] ? vfs_write+0x530/0x530 [ 28.571444] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.577559] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.583505] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.589628] [] vfs_readv+0x78/0xb0 [ 28.594793] [] SyS_readv+0xd9/0x240 [ 28.600038] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.606587] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.613143] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.619687] [ 28.621291] Allocated by task 0: [ 28.624622] (stack is not available) [ 28.628302] [ 28.629901] Freed by task 0: [ 28.632883] (stack is not available) [ 28.636569] [ 28.638165] The buggy address belongs to the object at ffff8800b5ef9100 [ 28.638165] which belongs to the cache fasync_cache of size 96 [ 28.650797] The buggy address is located 64 bytes inside of [ 28.650797] 96-byte region [ffff8800b5ef9100, ffff8800b5ef9160) [ 28.662465] The buggy address belongs to the page: [ 30.187519] PANIC: double fault, error_code: 0x0 [ 30.192297] CPU: 0 PID: 3323 Comm: syzkaller568282 Not tainted 4.4.112-g52c02cf #30 [ 30.200067] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.209389] task: ffff8800b4ae2f80 task.stack: ffff8801d0870000 [ 30.215420] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.224187] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.229608] RAX: ffff8800b4ae2f80 RBX: ffffea0002d7be40 RCX: ffffffff8148fea0 [ 30.236847] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0002d7be40 [ 30.244095] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.251334] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 30.258575] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 30.265820] FS: 00000000014f2880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.274022] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.279884] CR2: ffff8800fffffff8 CR3: 00000001d0f9e000 CR4: 0000000000160670 [ 30.287133] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.294374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.301613] Stack: [ 30.303727] [ 30.305321] Call Trace: [ 30.307870] [ 30.309897] 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 11 01 [ 30.336791] Kernel panic - not syncing: Machine halted. [ 30.342124] CPU: 0 PID: 3323 Comm: syzkaller568282 Not tainted 4.4.112-g52c02cf #30 [ 30.349884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.359214] 0000000000000000 c34b62d212857fe0 ffff8801db20ce38 ffffffff81d056fd [ 30.367186] ffffffff83836a60 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 30.375152] 0000000000000000 ffff8801db20cf00 ffffffff81419dca 0000000041b58ab3 [ 30.383144] Call Trace: [ 30.385694] <#DF> [] dump_stack+0xc1/0x124 [ 30.391761] [] panic+0x1aa/0x388 [ 30.396746] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.403641] [] ? vprintk_emit+0x242/0x850 [ 30.409411] [] ? dump_page_badflags+0x1d/0x250 [ 30.415611] [] ? vprintk_emit+0x242/0x850 [ 30.421378] [] df_debug+0x2d/0x30 [ 30.426452] [] do_double_fault+0x10b/0x210 [ 30.432306] [] double_fault+0x2d/0x40 [ 30.437726] [] ? dump_page_badflags+0x180/0x250 [ 30.444012] [] ? dump_page_badflags+0x8/0x250 [ 30.450135] <> [ 30.453605] Dumping ftrace buffer: [ 30.457443] (ftrace buffer empty) [ 30.461124] Kernel Offset: disabled [ 30.464741] Rebooting in 86400 seconds..