[ 16.436470] 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: [ 21.702089] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.128726] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.971782] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 23.145120] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 28.559779] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program executing program executing program [ 28.684124] ================================================================== [ 28.691511] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.698490] Read of size 8 at addr ffff8800b5d24240 by task syzkaller177844/3320 [ 28.705992] [ 28.707590] CPU: 1 PID: 3320 Comm: syzkaller177844 Not tainted 4.4.111-gf851888 #23 [ 28.715349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.724680] 0000000000000000 01a1d712e041c729 ffff8801d004f9f0 ffffffff81d0507d [ 28.732682] ffffea0002d74900 ffff8800b5d24240 0000000000000000 ffff8800b5d24240 [ 28.740630] ffff8801d0028238 ffff8801d004fa28 ffffffff814fd433 ffff8800b5d24240 [ 28.748583] Call Trace: [ 28.751143] [] dump_stack+0xc1/0x124 [ 28.756472] [] print_address_description+0x73/0x260 [ 28.763114] [] kasan_report+0x285/0x370 [ 28.768707] [] ? sg_remove_request+0xf9/0x110 [ 28.774826] [] __asan_report_load8_noabort+0x14/0x20 [ 28.781553] [] sg_remove_request+0xf9/0x110 [ 28.787500] [] sg_finish_rem_req+0x295/0x340 [ 28.793528] [] sg_read+0xa21/0x1490 [ 28.798784] [] ? __check_object_size+0x154/0x35b [ 28.805155] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.811789] [] ? fsnotify+0xee0/0xee0 [ 28.817217] [] ? avc_policy_seqno+0x9/0x20 [ 28.823088] [] do_loop_readv_writev+0x141/0x1e0 [ 28.829379] [] ? security_file_permission+0x89/0x1e0 [ 28.836099] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.842730] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.849363] [] do_readv_writev+0x5dd/0x6e0 [ 28.855212] [] ? vfs_write+0x530/0x530 [ 28.860717] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.866656] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.873637] [] ? __fget+0x232/0x3b0 [ 28.878880] [] ? __fget+0x47/0x3b0 [ 28.884033] [] vfs_readv+0x78/0xb0 [ 28.889185] [] SyS_readv+0xd9/0x240 [ 28.894424] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.900968] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.907511] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.914055] [ 28.915657] Allocated by task 0: [ 28.918982] (stack is not available) [ 28.922660] [ 28.924250] Freed by task 0: [ 28.927229] (stack is not available) [ 28.930902] [ 28.932496] The buggy address belongs to the object at ffff8800b5d24200 [ 28.932496] which belongs to the cache fasync_cache of size 96 [ 28.945123] The buggy address is located 64 bytes inside of [ 28.945123] 96-byte region [ffff8800b5d24200, ffff8800b5d24260) [ 28.956785] The buggy address belongs to the page: [ 30.411623] PANIC: double fault, error_code: 0x0 [ 30.416395] CPU: 1 PID: 3320 Comm: syzkaller177844 Not tainted 4.4.111-gf851888 #23 [ 30.424156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.433476] task: ffff8800b45d17c0 task.stack: ffff8801d0048000 [ 30.439498] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.448248] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.453662] RAX: ffff8800b45d17c0 RBX: ffffea0002d74900 RCX: ffffffff8148f980 [ 30.460896] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0002d74900 [ 30.468131] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.475364] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.482601] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.489837] FS: 00007fa4c476d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.498027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.503872] CR2: ffff8800fffffff8 CR3: 00000001d279e000 CR4: 0000000000160670 [ 30.511108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.518356] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.525597] Stack: [ 30.527710] [ 30.529301] Call Trace: [ 30.531849] [ 30.533874] 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 [ 30.560606] Kernel panic - not syncing: Machine halted. [ 30.565938] CPU: 1 PID: 3320 Comm: syzkaller177844 Not tainted 4.4.111-gf851888 #23 [ 30.573694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.583016] 0000000000000000 01a1d712e041c729 ffff8801db30ce38 ffffffff81d0507d [ 30.590976] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.598948] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.606902] Call Trace: [ 30.609462] <#DF> [] dump_stack+0xc1/0x124 [ 30.615533] [] panic+0x1aa/0x388 [ 30.620513] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.627407] [] ? vprintk_emit+0x242/0x850 [ 30.633171] [] ? dump_page_badflags+0x1d/0x250 [ 30.639800] [] ? vprintk_emit+0x242/0x850 [ 30.645570] [] df_debug+0x2d/0x30 [ 30.650637] [] do_double_fault+0x10b/0x210 [ 30.656486] [] double_fault+0x2d/0x40 [ 30.661904] [] ? dump_page_badflags+0x180/0x250 [ 30.669066] [] ? dump_page_badflags+0x8/0x250 [ 30.675184] <> [ 30.678711] Dumping ftrace buffer: [ 30.682558] (ftrace buffer empty) [ 30.686238] Kernel Offset: disabled [ 30.689854] Rebooting in 86400 seconds..