[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.150486] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.516570] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.518782] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 22.698172] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 22.750421] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.237' (ECDSA) to the list of known hosts. executing program [ 28.160338] ================================================================== [ 28.167736] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.174718] Read of size 8 at addr ffff8800b55b4140 by task syzkaller673140/3307 [ 28.182216] [ 28.183813] CPU: 1 PID: 3307 Comm: syzkaller673140 Not tainted 4.4.113-gef588ef #33 [ 28.191576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.200907] 0000000000000000 c7c08a27282048fd ffff8801d059fab0 ffffffff81d0278d [ 28.208867] ffffea0002d56d00 ffff8800b55b4140 0000000000000000 ffff8800b55b4140 [ 28.216842] ffff8801d05aa338 ffff8801d059fae8 ffffffff814fd053 ffff8800b55b4140 [ 28.224814] Call Trace: [ 28.227372] [] dump_stack+0xc1/0x124 [ 28.232704] [] print_address_description+0x73/0x260 [ 28.239335] [] kasan_report+0x285/0x370 [ 28.244934] [] ? sg_remove_request+0xf9/0x110 [ 28.251047] [] __asan_report_load8_noabort+0x14/0x20 [ 28.257766] [] sg_remove_request+0xf9/0x110 [ 28.263705] [] sg_finish_rem_req+0x295/0x340 [ 28.269733] [] sg_read+0xa1b/0x1490 [ 28.274978] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.281625] [] ? new_slab+0x2df/0x3b0 [ 28.287049] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.293684] [] __vfs_read+0x103/0x440 [ 28.299103] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.306087] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.313504] [] ? fsnotify+0x5ad/0xee0 [ 28.318924] [] ? fsnotify+0xee0/0xee0 [ 28.324345] [] ? lockdep_init_map+0xeb/0x1690 [ 28.330461] [] ? avc_policy_seqno+0x9/0x20 [ 28.336315] [] ? selinux_file_permission+0x348/0x460 [ 28.343038] [] ? security_file_permission+0x89/0x1e0 [ 28.349760] [] ? rw_verify_area+0x100/0x2f0 [ 28.355708] [] vfs_read+0x123/0x3a0 [ 28.360960] [] SyS_read+0xd9/0x1b0 [ 28.366116] [] ? do_sendfile+0xd30/0xd30 [ 28.371795] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.378266] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.384813] [ 28.386423] Allocated by task 0: [ 28.389754] (stack is not available) [ 28.393431] [ 28.395026] Freed by task 0: [ 28.398009] (stack is not available) [ 28.401686] [ 28.403283] The buggy address belongs to the object at ffff8800b55b4100 [ 28.403283] which belongs to the cache fasync_cache of size 96 [ 28.415906] The buggy address is located 64 bytes inside of [ 28.415906] 96-byte region [ffff8800b55b4100, ffff8800b55b4160) [ 28.427574] The buggy address belongs to the page: [ 29.935444] PANIC: double fault, error_code: 0x0 [ 29.940227] CPU: 1 PID: 3307 Comm: syzkaller673140 Not tainted 4.4.113-gef588ef #33 [ 29.947989] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.957333] task: ffff8800b5bd17c0 task.stack: ffff8801d0598000 [ 29.963358] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.972201] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.977625] RAX: ffff8800b5bd17c0 RBX: ffffea0002d56d00 RCX: ffffffff8148f8d0 [ 29.984865] RDX: 0000000000000000 RSI: ffffffff838a8de0 RDI: ffffea0002d56d00 [ 29.992105] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.999350] R10: 0000000000000002 R11: fffffbfff0ad7e26 R12: 0000000000000000 [ 30.006589] R13: ffffffff838a8de0 R14: 0000000000000000 R15: 0000000000000000 [ 30.013832] FS: 0000000001679880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.022035] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.027887] CR2: ffff8800fffffff8 CR3: 00000001d05ec000 CR4: 0000000000160670 [ 30.035137] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.042385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.049623] Stack: [ 30.051738] [ 30.053333] Call Trace: [ 30.055884] [ 30.057913] Code: 00 e9 83 fd ff ff e8 78 df 06 00 e9 50 fd ff ff e8 6e df 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 b1 04 [ 30.084829] Kernel panic - not syncing: Machine halted. [ 30.090164] CPU: 1 PID: 3307 Comm: syzkaller673140 Not tainted 4.4.113-gef588ef #33 [ 30.097926] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.108904] 0000000000000000 c7c08a27282048fd ffff8801db30ce38 ffffffff81d0278d [ 30.116866] ffffffff83837200 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.124887] 0000000000000000 ffff8801db30cf00 ffffffff81419b6a 0000000041b58ab3 [ 30.132877] Call Trace: [ 30.135427] <#DF> [] dump_stack+0xc1/0x124 [ 30.141499] [] panic+0x1aa/0x388 [ 30.146495] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.153391] [] ? vprintk_emit+0x242/0x850 [ 30.159158] [] ? dump_page_badflags+0x1d/0x250 [ 30.165358] [] ? vprintk_emit+0x242/0x850 [ 30.171126] [] df_debug+0x2d/0x30 [ 30.176198] [] do_double_fault+0x10b/0x210 [ 30.182053] [] double_fault+0x2d/0x40 [ 30.187473] [] ? dump_page_badflags+0x180/0x250 [ 30.193761] [] ? dump_page_badflags+0x8/0x250 [ 30.199873] <> [ 30.203309] Dumping ftrace buffer: [ 30.207157] (ftrace buffer empty) [ 30.210840] Kernel Offset: disabled [ 30.214446] Rebooting in 86400 seconds..