[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.426764] 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: [ 20.869191] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.158707] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.915523] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) [ 32.115162] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 37.499046] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) executing program [ 37.619372] IPVS: Creating netns size=2552 id=1 [ 37.640023] ================================================================== [ 37.647427] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 37.654407] Read of size 8 at addr ffff8801d19a1140 by task syzkaller741928/3339 [ 37.661909] [ 37.663506] CPU: 1 PID: 3339 Comm: syzkaller741928 Not tainted 4.4.111-g3301b55 #17 [ 37.671265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.680588] 0000000000000000 f1a71f8516a56cfe ffff8801d160fa40 ffffffff81d0509d [ 37.688543] ffffea0007466840 ffff8801d19a1140 0000000000000000 ffff8801d19a1140 [ 37.696505] ffff8801d0184438 ffff8801d160fa78 ffffffff814fd433 ffff8801d19a1140 [ 37.704457] Call Trace: [ 37.707016] [] dump_stack+0xc1/0x124 [ 37.712348] [] print_address_description+0x73/0x260 [ 37.718978] [] kasan_report+0x285/0x370 [ 37.724568] [] ? sg_remove_request+0xf9/0x110 [ 37.730678] [] __asan_report_load8_noabort+0x14/0x20 [ 37.737397] [] sg_remove_request+0xf9/0x110 [ 37.743333] [] sg_finish_rem_req+0x295/0x340 [ 37.749355] [] sg_read+0xa21/0x1490 [ 37.754595] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.761228] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 37.768214] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.774858] [] __vfs_read+0x103/0x440 [ 37.780275] [] ? vfs_iter_write+0x2d0/0x2d0 [ 37.786213] [] ? fsnotify+0x5ad/0xee0 [ 37.791625] [] ? fsnotify+0xee0/0xee0 [ 37.797040] [] ? avc_policy_seqno+0x9/0x20 [ 37.802891] [] ? selinux_file_permission+0x348/0x460 [ 37.809608] [] ? security_file_permission+0x89/0x1e0 [ 37.816325] [] ? rw_verify_area+0x100/0x2f0 [ 37.822274] [] vfs_read+0x123/0x3a0 [ 37.827514] [] SyS_read+0xd9/0x1b0 [ 37.832667] [] ? do_sendfile+0xd30/0xd30 [ 37.838354] [] ? do_fast_syscall_32+0xd7/0x890 [ 37.844548] [] ? do_sendfile+0xd30/0xd30 [ 37.850224] [] do_fast_syscall_32+0x314/0x890 [ 37.856342] [] sysenter_flags_fixed+0xd/0x17 [ 37.862364] [ 37.863960] Allocated by task 0: [ 37.867287] (stack is not available) [ 37.870963] [ 37.872557] Freed by task 0: [ 37.875541] (stack is not available) [ 37.879216] [ 37.880809] The buggy address belongs to the object at ffff8801d19a1100 [ 37.880809] which belongs to the cache fasync_cache of size 96 [ 37.893428] The buggy address is located 64 bytes inside of [ 37.893428] 96-byte region [ffff8801d19a1100, ffff8801d19a1160) [ 37.905098] The buggy address belongs to the page: [ 39.264612] PANIC: double fault, error_code: 0x0 [ 39.269394] CPU: 1 PID: 3339 Comm: syzkaller741928 Not tainted 4.4.111-g3301b55 #17 [ 39.277156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.286476] task: ffff8800b1494740 task.stack: ffff8801d1608000 [ 39.292514] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 39.301353] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 39.306774] RAX: ffff8800b1494740 RBX: ffffea0007466840 RCX: ffffffff8148f980 [ 39.314010] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0007466840 [ 39.321246] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 39.328481] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 39.335727] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 39.342964] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7792b40 [ 39.351162] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.357008] CR2: ffff8800fffffff8 CR3: 00000001d2800000 CR4: 0000000000160670 [ 39.364246] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.371483] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.378717] Stack: [ 39.380828] [ 39.382428] Call Trace: [ 39.384973] [ 39.386998] 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 [ 39.413769] Kernel panic - not syncing: Machine halted. [ 39.419101] CPU: 1 PID: 3339 Comm: syzkaller741928 Not tainted 4.4.111-g3301b55 #17 [ 39.426858] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.436195] 0000000000000000 f1a71f8516a56cfe ffff8801db30ce38 ffffffff81d0509d [ 39.444143] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 39.452095] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 39.460053] Call Trace: [ 39.462602] <#DF> [] dump_stack+0xc1/0x124 [ 39.468671] [] panic+0x1aa/0x388 [ 39.473651] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 39.480551] [] ? vprintk_emit+0x242/0x850 [ 39.486316] [] ? dump_page_badflags+0x27/0x250 [ 39.492513] [] ? vprintk_emit+0x242/0x850 [ 39.498275] [] df_debug+0x2d/0x30 [ 39.503342] [] do_double_fault+0x10b/0x210 [ 39.509192] [] double_fault+0x2d/0x40 [ 39.514610] [] ? dump_page_badflags+0x180/0x250 [ 39.520893] [] ? dump_page_badflags+0x12/0x250 [ 39.527098] <> [ 39.530466] Dumping ftrace buffer: [ 39.534293] (ftrace buffer empty) [ 39.537968] Kernel Offset: disabled [ 39.541570] Rebooting in 86400 seconds..