[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.078245] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.868737] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.296594] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.334195] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 28.458907] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. executing program executing program [ 34.023739] ================================================================== [ 34.031127] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 34.038116] Read of size 8 at addr ffff8800ba9ed140 by task syzkaller352541/4008 [ 34.045619] [ 34.047222] CPU: 0 PID: 4008 Comm: syzkaller352541 Not tainted 4.4.114-ga81d322 #4 [ 34.054900] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.064228] 0000000000000000 e8ab9bf643e49f83 ffff8801c8d779f0 ffffffff81d0394d [ 34.072219] ffffea0002ea7b40 ffff8800ba9ed140 0000000000000000 ffff8800ba9ed140 [ 34.080211] ffff8800ba0e4438 ffff8801c8d77a28 ffffffff814fe1d3 ffff8800ba9ed140 [ 34.088201] Call Trace: [ 34.090768] [] dump_stack+0xc1/0x124 [ 34.096106] [] print_address_description+0x73/0x260 [ 34.103584] [] kasan_report+0x285/0x370 [ 34.109194] [] ? sg_remove_request+0xf9/0x110 [ 34.115312] [] __asan_report_load8_noabort+0x14/0x20 [ 34.122046] [] sg_remove_request+0xf9/0x110 [ 34.127985] [] sg_finish_rem_req+0x295/0x340 [ 34.134015] [] sg_read+0xa1b/0x1490 [ 34.139264] [] ? __check_object_size+0x154/0x35b [ 34.145645] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.152282] [] ? fsnotify+0xee0/0xee0 [ 34.157706] [] ? avc_policy_seqno+0x9/0x20 [ 34.163577] [] do_loop_readv_writev+0x141/0x1e0 [ 34.169871] [] ? security_file_permission+0x89/0x1e0 [ 34.176602] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.183245] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.189881] [] do_readv_writev+0x5dd/0x6e0 [ 34.195735] [] ? vfs_write+0x530/0x530 [ 34.201242] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.207189] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 34.214177] [] ? __fget+0x20b/0x3b0 [ 34.219423] [] ? __fget+0x232/0x3b0 [ 34.224668] [] ? __fget+0x47/0x3b0 [ 34.229832] [] vfs_readv+0x78/0xb0 [ 34.234995] [] SyS_readv+0xd9/0x240 [ 34.240251] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 34.246805] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 34.253358] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.259905] [ 34.261503] Allocated by task 0: [ 34.264836] (stack is not available) [ 34.268517] [ 34.270114] Freed by task 0: [ 34.273098] (stack is not available) [ 34.276777] [ 34.278375] The buggy address belongs to the object at ffff8800ba9ed100 [ 34.278375] which belongs to the cache fasync_cache of size 96 [ 34.291003] The buggy address is located 64 bytes inside of [ 34.291003] 96-byte region [ffff8800ba9ed100, ffff8800ba9ed160) [ 34.302674] The buggy address belongs to the page: [ 35.741744] PANIC: double fault, error_code: 0x0 [ 35.746531] CPU: 0 PID: 4008 Comm: syzkaller352541 Not tainted 4.4.114-ga81d322 #4 [ 35.754228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.763559] task: ffff8800bb2fc800 task.stack: ffff8801c8d70000 [ 35.769587] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 35.778345] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 35.783765] RAX: ffff8800bb2fc800 RBX: ffffea0002ea7b40 RCX: ffffffff81490a40 [ 35.791021] RDX: 0000000000000000 RSI: ffffffff838a8e60 RDI: ffffea0002ea7b40 [ 35.798263] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 35.805505] R10: 0000000000000002 R11: fffffbfff0ad7e2e R12: 0000000000000000 [ 35.812750] R13: ffffffff838a8e60 R14: 0000000000000000 R15: 0000000000000000 [ 35.819993] FS: 00007fb591c37700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.828189] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.834040] CR2: ffff8800fffffff8 CR3: 00000000bac7c000 CR4: 0000000000160670 [ 35.841282] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.848552] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.855804] Stack: [ 35.857922] [ 35.859530] Call Trace: [ 35.862081] [ 35.864111] Code: 00 e9 83 fd ff ff e8 88 df 06 00 e9 50 fd ff ff e8 7e df 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 91 04 [ 35.891114] Kernel panic - not syncing: Machine halted. [ 35.896452] CPU: 0 PID: 4008 Comm: syzkaller352541 Not tainted 4.4.114-ga81d322 #4 [ 35.904129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.913458] 0000000000000000 e8ab9bf643e49f83 ffff8801db20ce38 ffffffff81d0394d [ 35.921457] ffffffff838372a0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 35.929438] 0000000000000000 ffff8801db20cf00 ffffffff8141acba 0000000041b58ab3 [ 35.937412] Call Trace: [ 35.939965] <#DF> [] dump_stack+0xc1/0x124 [ 35.946033] [] panic+0x1aa/0x388 [ 35.951019] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 35.957917] [] ? vprintk_emit+0x242/0x850 [ 35.963691] [] ? dump_page_badflags+0x1d/0x250 [ 35.969892] [] ? vprintk_emit+0x242/0x850 [ 35.975663] [] df_debug+0x2d/0x30 [ 35.980743] [] do_double_fault+0x10b/0x210 [ 35.986607] [] double_fault+0x2d/0x40 [ 35.992032] [] ? dump_page_badflags+0x180/0x250 [ 35.998326] [] ? dump_page_badflags+0x8/0x250 [ 36.004438] <> [ 36.007972] Dumping ftrace buffer: [ 36.011843] (ftrace buffer empty) [ 36.015541] Kernel Offset: disabled [ 36.019153] Rebooting in 86400 seconds..