[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.645882] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.270270] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.603965] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.342828] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 21.519140] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.15.244' (ECDSA) to the list of known hosts. [ 26.897426] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.048005] ================================================================== [ 27.055392] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.062385] Read of size 8 at addr ffff8800b5b68a40 by task syzkaller991907/3326 [ 27.069894] [ 27.071500] CPU: 1 PID: 3326 Comm: syzkaller991907 Not tainted 4.4.111-g1849cd3 #19 [ 27.079262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.088588] 0000000000000000 bdf6099613729ee6 ffff8801d04f7a40 ffffffff81d0509d [ 27.096582] ffffea0002d6da00 ffff8800b5b68a40 0000000000000000 ffff8800b5b68a40 [ 27.104581] ffff8801d0432338 ffff8801d04f7a78 ffffffff814fd433 ffff8800b5b68a40 [ 27.112558] Call Trace: [ 27.115120] [] dump_stack+0xc1/0x124 [ 27.120458] [] print_address_description+0x73/0x260 [ 27.127110] [] kasan_report+0x285/0x370 [ 27.132708] [] ? sg_remove_request+0xf9/0x110 [ 27.138831] [] __asan_report_load8_noabort+0x14/0x20 [ 27.145558] [] sg_remove_request+0xf9/0x110 [ 27.151510] [] sg_finish_rem_req+0x295/0x340 [ 27.157542] [] sg_read+0xa21/0x1490 [ 27.162794] [] ? do_futex+0x3e3/0x1670 [ 27.168302] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.174944] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.181931] [] ? vma_set_page_prot+0x10b/0x150 [ 27.188139] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.194786] [] __vfs_read+0x103/0x440 [ 27.200208] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.206158] [] ? fsnotify+0x5ad/0xee0 [ 27.211580] [] ? fsnotify+0xee0/0xee0 [ 27.217008] [] ? avc_policy_seqno+0x9/0x20 [ 27.222865] [] ? selinux_file_permission+0x348/0x460 [ 27.229589] [] ? security_file_permission+0x89/0x1e0 [ 27.236326] [] ? rw_verify_area+0x100/0x2f0 [ 27.242268] [] vfs_read+0x123/0x3a0 [ 27.247525] [] SyS_read+0xd9/0x1b0 [ 27.252686] [] ? do_sendfile+0xd30/0xd30 [ 27.258367] [] ? vmacache_update+0xfe/0x130 [ 27.264319] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.270529] [] ? do_sendfile+0xd30/0xd30 [ 27.276216] [] do_fast_syscall_32+0x314/0x890 [ 27.282346] [] sysenter_flags_fixed+0xd/0x17 [ 27.288376] [ 27.289979] Allocated by task 0: [ 27.293324] (stack is not available) [ 27.297008] [ 27.298867] Freed by task 0: [ 27.301852] (stack is not available) [ 27.305540] [ 27.307325] The buggy address belongs to the object at ffff8800b5b68a00 [ 27.307325] which belongs to the cache fasync_cache of size 96 [ 27.319954] The buggy address is located 64 bytes inside of [ 27.319954] 96-byte region [ffff8800b5b68a00, ffff8800b5b68a60) [ 27.334930] The buggy address belongs to the page: [ 29.018391] PANIC: double fault, error_code: 0x0 [ 29.023163] CPU: 1 PID: 3326 Comm: syzkaller991907 Not tainted 4.4.111-g1849cd3 #19 [ 29.030938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.040274] task: ffff8800b5194740 task.stack: ffff8801d04f0000 [ 29.046304] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 29.055159] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.060589] RAX: ffff8800b5194740 RBX: ffffea0002d6da00 RCX: ffffffff8148f980 [ 29.067833] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d6da00 [ 29.075076] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 29.082319] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.089571] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 29.096817] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f774db40 [ 29.105018] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.110880] CR2: ffff8800fffffff8 CR3: 00000000b4862000 CR4: 0000000000160670 [ 29.118130] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.125374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.132625] Stack: [ 29.134744] [ 29.136341] Call Trace: [ 29.138894] [ 29.140931] Code: 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 ed ff 48 8d 7b 10 48 b8 00 00 [ 29.168094] Kernel panic - not syncing: Machine halted. [ 29.173434] CPU: 1 PID: 3326 Comm: syzkaller991907 Not tainted 4.4.111-g1849cd3 #19 [ 29.181200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.190530] 0000000000000000 bdf6099613729ee6 ffff8801db30ce38 ffffffff81d0509d [ 29.198523] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 29.206532] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 29.214511] Call Trace: [ 29.217065] <#DF> [] dump_stack+0xc1/0x124 [ 29.223143] [] panic+0x1aa/0x388 [ 29.228136] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.235036] [] ? vprintk_emit+0x242/0x850 [ 29.240894] [] ? dump_page_badflags+0x27/0x250 [ 29.247102] [] ? vprintk_emit+0x242/0x850 [ 29.252872] [] df_debug+0x2d/0x30 [ 29.257947] [] do_double_fault+0x10b/0x210 [ 29.263806] [] double_fault+0x2d/0x40 [ 29.269228] [] ? dump_page_badflags+0x180/0x250 [ 29.275527] [] ? dump_page_badflags+0x12/0x250 [ 29.281734] <> [ 29.285232] Dumping ftrace buffer: [ 29.289092] (ftrace buffer empty) [ 29.292773] Kernel Offset: disabled [ 29.296383] Rebooting in 86400 seconds..