[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.650846] 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: [ 21.794540] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.225451] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.132779] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 23.305269] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.15.219' (ECDSA) to the list of known hosts. [ 28.684664] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 28.792599] ================================================================== [ 28.799996] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.806985] Read of size 8 at addr ffff8801ccade140 by task syzkaller493479/3317 [ 28.814493] [ 28.816104] CPU: 1 PID: 3317 Comm: syzkaller493479 Not tainted 4.4.112-g3fc4284 #32 [ 28.823865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.833189] 0000000000000000 bc343f488a1dc816 ffff8801cfd0fab0 ffffffff81d054ed [ 28.841169] ffffea000732b780 ffff8801ccade140 0000000000000000 ffff8801ccade140 [ 28.849170] ffff8800b4e1a338 ffff8801cfd0fae8 ffffffff814fd953 ffff8801ccade140 [ 28.857243] Call Trace: [ 28.859806] [] dump_stack+0xc1/0x124 [ 28.865140] [] print_address_description+0x73/0x260 [ 28.871783] [] kasan_report+0x285/0x370 [ 28.877389] [] ? sg_remove_request+0xf9/0x110 [ 28.883605] [] __asan_report_load8_noabort+0x14/0x20 [ 28.890336] [] sg_remove_request+0xf9/0x110 [ 28.896278] [] sg_finish_rem_req+0x295/0x340 [ 28.902306] [] sg_read+0xa21/0x1490 [ 28.907551] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.914187] [] ? new_slab+0x2df/0x3b0 [ 28.919701] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.926338] [] __vfs_read+0x103/0x440 [ 28.931768] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.938761] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.944709] [] ? fsnotify+0x5ad/0xee0 [ 28.950130] [] ? fsnotify+0xee0/0xee0 [ 28.955548] [] ? lockdep_init_map+0xeb/0x1690 [ 28.961665] [] ? avc_policy_seqno+0x9/0x20 [ 28.967518] [] ? selinux_file_permission+0x348/0x460 [ 28.974249] [] ? security_file_permission+0x89/0x1e0 [ 28.980981] [] ? rw_verify_area+0x100/0x2f0 [ 28.986921] [] vfs_read+0x123/0x3a0 [ 28.992165] [] SyS_read+0xd9/0x1b0 [ 28.997340] [] ? do_sendfile+0xd30/0xd30 [ 29.003019] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.009480] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.016023] [ 29.017620] Allocated by task 0: [ 29.020953] (stack is not available) [ 29.024634] [ 29.026232] Freed by task 0: [ 29.029218] (stack is not available) [ 29.032898] [ 29.034493] The buggy address belongs to the object at ffff8801ccade100 [ 29.034493] which belongs to the cache fasync_cache of size 96 [ 29.047120] The buggy address is located 64 bytes inside of [ 29.047120] 96-byte region [ffff8801ccade100, ffff8801ccade160) [ 29.058786] The buggy address belongs to the page: [ 30.574828] PANIC: double fault, error_code: 0x0 [ 30.579705] CPU: 1 PID: 3317 Comm: syzkaller493479 Not tainted 4.4.112-g3fc4284 #32 [ 30.587468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.596796] task: ffff8800b4cfc740 task.stack: ffff8801cfd08000 [ 30.602831] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.611597] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.617023] RAX: ffff8800b4cfc740 RBX: ffffea000732b780 RCX: ffffffff8148fea0 [ 30.624276] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea000732b780 [ 30.631604] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.638851] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 30.646108] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 30.653450] FS: 00000000011d0880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.661646] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.667509] CR2: ffff8800fffffff8 CR3: 00000001d1102000 CR4: 0000000000160670 [ 30.674840] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.682082] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.689329] Stack: [ 30.691448] [ 30.693042] Call Trace: [ 30.695594] [ 30.697631] 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 [ 30.724703] Kernel panic - not syncing: Machine halted. [ 30.730036] CPU: 1 PID: 3317 Comm: syzkaller493479 Not tainted 4.4.112-g3fc4284 #32 [ 30.737797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.747131] 0000000000000000 bc343f488a1dc816 ffff8801db30ce38 ffffffff81d054ed [ 30.755120] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.763088] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 30.771098] Call Trace: [ 30.773650] <#DF> [] dump_stack+0xc1/0x124 [ 30.779722] [] panic+0x1aa/0x388 [ 30.784719] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.791615] [] ? vprintk_emit+0x242/0x850 [ 30.797384] [] ? dump_page_badflags+0x1d/0x250 [ 30.803585] [] ? vprintk_emit+0x242/0x850 [ 30.809352] [] df_debug+0x2d/0x30 [ 30.814428] [] do_double_fault+0x10b/0x210 [ 30.820283] [] double_fault+0x2d/0x40 [ 30.825703] [] ? dump_page_badflags+0x180/0x250 [ 30.832001] [] ? dump_page_badflags+0x8/0x250 [ 30.838113] <> [ 30.841637] Dumping ftrace buffer: [ 30.845490] (ftrace buffer empty) [ 30.849180] Kernel Offset: disabled [ 30.852787] Rebooting in 86400 seconds..