[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.750530] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.331207] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.695567] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.605706] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) [ 31.161361] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.15.240' (ECDSA) to the list of known hosts. [ 36.546598] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program [ 36.644876] ================================================================== [ 36.652269] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 36.659256] Read of size 8 at addr ffff8801d132c140 by task syzkaller759711/3330 [ 36.666754] [ 36.668356] CPU: 0 PID: 3330 Comm: syzkaller759711 Not tainted 4.4.112-g3fc4284 #32 [ 36.676117] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.685443] 0000000000000000 21ec65d8bea73a9e ffff8801d057fab0 ffffffff81d054ed [ 36.693414] ffffea000744cb00 ffff8801d132c140 0000000000000000 ffff8801d132c140 [ 36.701417] ffff8801d0f32338 ffff8801d057fae8 ffffffff814fd953 ffff8801d132c140 [ 36.709388] Call Trace: [ 36.711959] [] dump_stack+0xc1/0x124 [ 36.717292] [] print_address_description+0x73/0x260 [ 36.723936] [] kasan_report+0x285/0x370 [ 36.729532] [] ? sg_remove_request+0xf9/0x110 [ 36.735653] [] __asan_report_load8_noabort+0x14/0x20 [ 36.742376] [] sg_remove_request+0xf9/0x110 [ 36.748326] [] sg_finish_rem_req+0x295/0x340 [ 36.754352] [] sg_read+0xa21/0x1490 [ 36.759598] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.766239] [] ? new_slab+0x2df/0x3b0 [ 36.771669] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.778306] [] __vfs_read+0x103/0x440 [ 36.783729] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 36.790711] [] ? vfs_iter_write+0x2d0/0x2d0 [ 36.796651] [] ? fsnotify+0x5ad/0xee0 [ 36.802084] [] ? fsnotify+0xee0/0xee0 [ 36.807508] [] ? lockdep_init_map+0xeb/0x1690 [ 36.813622] [] ? avc_policy_seqno+0x9/0x20 [ 36.819494] [] ? selinux_file_permission+0x348/0x460 [ 36.826214] [] ? security_file_permission+0x89/0x1e0 [ 36.832947] [] ? rw_verify_area+0x100/0x2f0 [ 36.838890] [] vfs_read+0x123/0x3a0 [ 36.844136] [] SyS_read+0xd9/0x1b0 [ 36.849295] [] ? do_sendfile+0xd30/0xd30 [ 36.854977] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.861442] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 36.867996] [ 36.869594] Allocated by task 0: [ 36.872945] (stack is not available) [ 36.876635] [ 36.878238] Freed by task 0: [ 36.881224] (stack is not available) [ 36.884903] [ 36.886501] The buggy address belongs to the object at ffff8801d132c100 [ 36.886501] which belongs to the cache fasync_cache of size 96 [ 36.899125] The buggy address is located 64 bytes inside of [ 36.899125] 96-byte region [ffff8801d132c100, ffff8801d132c160) [ 36.910794] The buggy address belongs to the page: [ 38.416936] PANIC: double fault, error_code: 0x0 [ 38.421711] CPU: 0 PID: 3330 Comm: syzkaller759711 Not tainted 4.4.112-g3fc4284 #32 [ 38.429473] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.438806] task: ffff8801d1bd2f80 task.stack: ffff8801d0578000 [ 38.444833] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 38.453588] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 38.459004] RAX: ffff8801d1bd2f80 RBX: ffffea000744cb00 RCX: ffffffff8148fea0 [ 38.466245] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea000744cb00 [ 38.473496] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 38.480750] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 38.487987] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 38.495228] FS: 0000000001ec8880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.503425] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.509277] CR2: ffff8800fffffff8 CR3: 00000001d0fc2000 CR4: 0000000000160670 [ 38.516518] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.523768] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.531004] Stack: [ 38.533119] [ 38.534714] Call Trace: [ 38.537264] [ 38.539295] 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 [ 38.566207] Kernel panic - not syncing: Machine halted. [ 38.571542] CPU: 0 PID: 3330 Comm: syzkaller759711 Not tainted 4.4.112-g3fc4284 #32 [ 38.579302] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.588622] 0000000000000000 21ec65d8bea73a9e ffff8801db20ce38 ffffffff81d054ed [ 38.596585] ffffffff83836a60 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 38.604545] 0000000000000000 ffff8801db20cf00 ffffffff81419dca 0000000041b58ab3 [ 38.612504] Call Trace: [ 38.615050] <#DF> [] dump_stack+0xc1/0x124 [ 38.621113] [] panic+0x1aa/0x388 [ 38.626097] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 38.633005] [] ? vprintk_emit+0x242/0x850 [ 38.639448] [] ? dump_page_badflags+0x1d/0x250 [ 38.645653] [] ? vprintk_emit+0x242/0x850 [ 38.651419] [] df_debug+0x2d/0x30 [ 38.656491] [] do_double_fault+0x10b/0x210 [ 38.662346] [] double_fault+0x2d/0x40 [ 38.667762] [] ? dump_page_badflags+0x180/0x250 [ 38.674047] [] ? dump_page_badflags+0x8/0x250 [ 38.680157] <> [ 38.683540] Dumping ftrace buffer: [ 38.687364] (ftrace buffer empty) [ 38.691042] Kernel Offset: disabled [ 38.694649] Rebooting in 86400 seconds..