[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.115041] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.884057] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.218890] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.012885] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 43.999977] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 49.381272] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 49.478500] ================================================================== [ 49.485892] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 49.492872] Read of size 8 at addr ffff8801d2c89140 by task syzkaller656450/3328 [ 49.500364] [ 49.501959] CPU: 0 PID: 3328 Comm: syzkaller656450 Not tainted 4.4.112-g5f6325b #28 [ 49.509715] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.519040] 0000000000000000 1f13794c01dbe495 ffff8801d03f7ab0 ffffffff81d0579d [ 49.526991] ffffea00074b2240 ffff8801d2c89140 0000000000000000 ffff8801d2c89140 [ 49.534938] ffff8801d0a82338 ffff8801d03f7ae8 ffffffff814fd9f3 ffff8801d2c89140 [ 49.542896] Call Trace: [ 49.545450] [] dump_stack+0xc1/0x124 [ 49.550781] [] print_address_description+0x73/0x260 [ 49.557413] [] kasan_report+0x285/0x370 [ 49.563002] [] ? sg_remove_request+0xf9/0x110 [ 49.569109] [] __asan_report_load8_noabort+0x14/0x20 [ 49.575912] [] sg_remove_request+0xf9/0x110 [ 49.581847] [] sg_finish_rem_req+0x295/0x340 [ 49.587868] [] sg_read+0xa21/0x1490 [ 49.593112] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 49.599741] [] ? new_slab+0x2df/0x3b0 [ 49.605157] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 49.611788] [] __vfs_read+0x103/0x440 [ 49.617204] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 49.624189] [] ? vfs_iter_write+0x2d0/0x2d0 [ 49.630127] [] ? fsnotify+0x5ad/0xee0 [ 49.635540] [] ? fsnotify+0xee0/0xee0 [ 49.641043] [] ? lockdep_init_map+0xeb/0x1690 [ 49.647155] [] ? avc_policy_seqno+0x9/0x20 [ 49.653012] [] ? selinux_file_permission+0x348/0x460 [ 49.659732] [] ? security_file_permission+0x89/0x1e0 [ 49.666458] [] ? rw_verify_area+0x100/0x2f0 [ 49.672488] [] vfs_read+0x123/0x3a0 [ 49.677727] [] SyS_read+0xd9/0x1b0 [ 49.682879] [] ? do_sendfile+0xd30/0xd30 [ 49.688554] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 49.695018] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 49.701733] [ 49.703325] Allocated by task 0: [ 49.706653] (stack is not available) [ 49.710329] [ 49.711919] Freed by task 0: [ 49.714906] (stack is not available) [ 49.718582] [ 49.720183] The buggy address belongs to the object at ffff8801d2c89100 [ 49.720183] which belongs to the cache fasync_cache of size 96 [ 49.732811] The buggy address is located 64 bytes inside of [ 49.732811] 96-byte region [ffff8801d2c89100, ffff8801d2c89160) [ 49.744476] The buggy address belongs to the page: [ 51.234296] PANIC: double fault, error_code: 0x0 [ 51.239064] CPU: 0 PID: 3328 Comm: syzkaller656450 Not tainted 4.4.112-g5f6325b #28 [ 51.246830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.256152] task: ffff8800b4e92f80 task.stack: ffff8801d03f0000 [ 51.262175] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 51.270923] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 51.276337] RAX: ffff8800b4e92f80 RBX: ffffea00074b2240 RCX: ffffffff8148ff40 [ 51.283573] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea00074b2240 [ 51.290810] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 51.298044] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 51.305281] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 51.312518] FS: 0000000000e6a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 51.320717] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.326569] CR2: ffff8800fffffff8 CR3: 00000001d0a70000 CR4: 0000000000160670 [ 51.333807] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.341042] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.348275] Stack: [ 51.350395] [ 51.351988] Call Trace: [ 51.354629] [ 51.356652] 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 [ 51.383291] Kernel panic - not syncing: Machine halted. [ 51.388619] CPU: 0 PID: 3328 Comm: syzkaller656450 Not tainted 4.4.112-g5f6325b #28 [ 51.396375] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.405693] 0000000000000000 1f13794c01dbe495 ffff8801db20ce38 ffffffff81d0579d [ 51.413641] ffffffff83836a60 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 51.421678] 0000000000000000 ffff8801db20cf00 ffffffff81419e6a 0000000041b58ab3 [ 51.429626] Call Trace: [ 51.432171] <#DF> [] dump_stack+0xc1/0x124 [ 51.438230] [] panic+0x1aa/0x388 [ 51.443222] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 51.450124] [] ? vprintk_emit+0x242/0x850 [ 51.456321] [] ? dump_page_badflags+0x1d/0x250 [ 51.462515] [] ? vprintk_emit+0x242/0x850 [ 51.468283] [] df_debug+0x2d/0x30 [ 51.473523] [] do_double_fault+0x10b/0x210 [ 51.479372] [] double_fault+0x2d/0x40 [ 51.484784] [] ? dump_page_badflags+0x180/0x250 [ 51.491065] [] ? dump_page_badflags+0x8/0x250 [ 51.497173] <> [ 51.500202] Dumping ftrace buffer: [ 51.504016] (ftrace buffer empty) [ 51.507695] Kernel Offset: disabled [ 51.511303] Rebooting in 86400 seconds..