[ 17.064231] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.536647] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.817302] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.671657] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 38.270562] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.15.196' (ECDSA) to the list of known hosts. [ 43.640867] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program executing program executing program executing program executing program [ 43.778083] ================================================================== [ 43.785487] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 43.792484] Read of size 8 at addr ffff8801d12d8240 by task syzkaller012622/3333 [ 43.799993] [ 43.801596] CPU: 1 PID: 3333 Comm: syzkaller012622 Not tainted 4.4.111-gc2f631b #27 [ 43.809379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.818719] 0000000000000000 e1ebbc5cc3b79abd ffff8801d07df9f0 ffffffff81d0513d [ 43.826688] ffffea000744b600 ffff8801d12d8240 0000000000000000 ffff8801d12d8240 [ 43.834688] ffff8801d0758238 ffff8801d07dfa28 ffffffff814fd433 ffff8801d12d8240 [ 43.842671] Call Trace: [ 43.845232] [] dump_stack+0xc1/0x124 [ 43.850580] [] print_address_description+0x73/0x260 [ 43.857217] [] kasan_report+0x285/0x370 [ 43.862819] [] ? sg_remove_request+0xf9/0x110 [ 43.868940] [] __asan_report_load8_noabort+0x14/0x20 [ 43.875667] [] sg_remove_request+0xf9/0x110 [ 43.881611] [] sg_finish_rem_req+0x295/0x340 [ 43.887641] [] sg_read+0xa21/0x1490 [ 43.892893] [] ? __check_object_size+0x154/0x35b [ 43.899267] [] ? 0xffffffff810002b8 [ 43.904515] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 43.911154] [] ? fsnotify+0xee0/0xee0 [ 43.916587] [] ? avc_policy_seqno+0x9/0x20 [ 43.922452] [] do_loop_readv_writev+0x141/0x1e0 [ 43.928752] [] ? security_file_permission+0x89/0x1e0 [ 43.935485] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 43.942123] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 43.948763] [] do_readv_writev+0x5dd/0x6e0 [ 43.954625] [] ? vfs_write+0x530/0x530 [ 43.960135] [] ? _raw_spin_unlock+0x2c/0x50 [ 43.966102] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 43.973093] [] ? __fget+0x20b/0x3b0 [ 43.978348] [] ? __fget+0x232/0x3b0 [ 43.983599] [] ? __fget+0x47/0x3b0 [ 43.988798] [] vfs_readv+0x78/0xb0 [ 43.993971] [] SyS_readv+0xd9/0x240 [ 43.999220] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 44.005783] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 44.012340] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 44.018889] [ 44.020507] Allocated by task 0: [ 44.023844] (stack is not available) [ 44.027534] [ 44.029232] Freed by task 0: [ 44.032217] (stack is not available) [ 44.035907] [ 44.037508] The buggy address belongs to the object at ffff8801d12d8200 [ 44.037508] which belongs to the cache fasync_cache of size 96 [ 44.050134] The buggy address is located 64 bytes inside of [ 44.050134] 96-byte region [ffff8801d12d8200, ffff8801d12d8260) [ 44.061806] The buggy address belongs to the page: [ 45.628976] PANIC: double fault, error_code: 0x0 [ 45.633752] CPU: 1 PID: 3333 Comm: syzkaller012622 Not tainted 4.4.111-gc2f631b #27 [ 45.641530] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.650856] task: ffff8800b3c84740 task.stack: ffff8801d07d8000 [ 45.656884] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 45.665638] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 45.671057] RAX: ffff8800b3c84740 RBX: ffffea000744b600 RCX: ffffffff8148f980 [ 45.678298] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea000744b600 [ 45.685539] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 45.692799] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 45.700046] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 45.707298] FS: 00007feae2ca2700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 45.715502] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.721356] CR2: ffff8800fffffff8 CR3: 00000000b46e6000 CR4: 0000000000160670 [ 45.728607] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.735848] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.743097] Stack: [ 45.745217] [ 45.746810] Call Trace: [ 45.749359] [ 45.751389] 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 [ 45.778420] Kernel panic - not syncing: Machine halted. [ 45.783760] CPU: 1 PID: 3333 Comm: syzkaller012622 Not tainted 4.4.111-gc2f631b #27 [ 45.791526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.800851] 0000000000000000 e1ebbc5cc3b79abd ffff8801db30ce38 ffffffff81d0513d [ 45.809963] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 45.817969] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 45.825946] Call Trace: [ 45.828500] <#DF> [] dump_stack+0xc1/0x124 [ 45.834580] [] panic+0x1aa/0x388 [ 45.839570] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 45.846470] [] ? vprintk_emit+0x242/0x850 [ 45.852239] [] ? dump_page_badflags+0x1d/0x250 [ 45.858440] [] ? vprintk_emit+0x242/0x850 [ 45.864210] [] df_debug+0x2d/0x30 [ 45.869285] [] do_double_fault+0x10b/0x210 [ 45.875143] [] double_fault+0x2d/0x40 [ 45.880565] [] ? dump_page_badflags+0x180/0x250 [ 45.886854] [] ? dump_page_badflags+0x8/0x250 [ 45.892966] <> [ 45.896488] Dumping ftrace buffer: [ 45.900336] (ftrace buffer empty) [ 45.904024] Kernel Offset: disabled [ 45.907631] Rebooting in 86400 seconds..