[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.780759] 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: [ 20.447285] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.814115] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.672107] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 21.849218] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.15.221' (ECDSA) to the list of known hosts. [ 27.242550] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 27.332462] ================================================================== [ 27.339959] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.346948] Read of size 8 at addr ffff8801d0906140 by task syzkaller793545/3325 [ 27.354442] [ 27.356038] CPU: 1 PID: 3325 Comm: syzkaller793545 Not tainted 4.4.111-g3301b55 #24 [ 27.363811] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.373154] 0000000000000000 1edbd9d0252e8528 ffff8801d00a7ab0 ffffffff81d0509d [ 27.381107] ffffea0007424180 ffff8801d0906140 0000000000000000 ffff8801d0906140 [ 27.389054] ffff8801d0a92338 ffff8801d00a7ae8 ffffffff814fd433 ffff8801d0906140 [ 27.396997] Call Trace: [ 27.399559] [] dump_stack+0xc1/0x124 [ 27.404887] [] print_address_description+0x73/0x260 [ 27.411515] [] kasan_report+0x285/0x370 [ 27.417105] [] ? sg_remove_request+0xf9/0x110 [ 27.423212] [] __asan_report_load8_noabort+0x14/0x20 [ 27.429929] [] sg_remove_request+0xf9/0x110 [ 27.435868] [] sg_finish_rem_req+0x295/0x340 [ 27.441888] [] sg_read+0xa21/0x1490 [ 27.447130] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.453760] [] ? new_slab+0x2df/0x3b0 [ 27.459184] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.465819] [] __vfs_read+0x103/0x440 [ 27.471238] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.478216] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.484151] [] ? fsnotify+0x5ad/0xee0 [ 27.489565] [] ? fsnotify+0xee0/0xee0 [ 27.494981] [] ? lockdep_init_map+0xeb/0x1690 [ 27.501092] [] ? avc_policy_seqno+0x9/0x20 [ 27.506949] [] ? selinux_file_permission+0x348/0x460 [ 27.513666] [] ? security_file_permission+0x89/0x1e0 [ 27.520391] [] ? rw_verify_area+0x100/0x2f0 [ 27.526326] [] vfs_read+0x123/0x3a0 [ 27.531566] [] SyS_read+0xd9/0x1b0 [ 27.536724] [] ? do_sendfile+0xd30/0xd30 [ 27.542398] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.548861] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.555403] [ 27.556996] Allocated by task 0: [ 27.560322] (stack is not available) [ 27.563996] [ 27.565586] Freed by task 0: [ 27.568564] (stack is not available) [ 27.572238] [ 27.573830] The buggy address belongs to the object at ffff8801d0906100 [ 27.573830] which belongs to the cache fasync_cache of size 96 [ 27.586453] The buggy address is located 64 bytes inside of [ 27.586453] 96-byte region [ffff8801d0906100, ffff8801d0906160) [ 27.598116] The buggy address belongs to the page: [ 29.107985] PANIC: double fault, error_code: 0x0 [ 29.112766] CPU: 1 PID: 3325 Comm: syzkaller793545 Not tainted 4.4.111-g3301b55 #24 [ 29.120531] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.129854] task: ffff8800b4e80000 task.stack: ffff8801d00a0000 [ 29.135873] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.144616] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.150026] RAX: ffff8800b4e80000 RBX: ffffea0007424180 RCX: ffffffff8148f980 [ 29.157272] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0007424180 [ 29.164513] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.171755] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.178991] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 29.186228] FS: 0000000000af0880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.194426] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.200274] CR2: ffff8800fffffff8 CR3: 00000001d70c8000 CR4: 0000000000160670 [ 29.207518] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.214756] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.221992] Stack: [ 29.224105] [ 29.225697] Call Trace: [ 29.228243] [ 29.230269] 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 61 06 [ 29.256920] Kernel panic - not syncing: Machine halted. [ 29.262248] CPU: 1 PID: 3325 Comm: syzkaller793545 Not tainted 4.4.111-g3301b55 #24 [ 29.270008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.279327] 0000000000000000 1edbd9d0252e8528 ffff8801db30ce38 ffffffff81d0509d [ 29.287273] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 29.295222] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 29.303164] Call Trace: [ 29.305719] <#DF> [] dump_stack+0xc1/0x124 [ 29.311784] [] panic+0x1aa/0x388 [ 29.316771] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.323667] [] ? vprintk_emit+0x242/0x850 [ 29.329429] [] ? dump_page_badflags+0x1d/0x250 [ 29.335624] [] ? vprintk_emit+0x242/0x850 [ 29.341387] [] df_debug+0x2d/0x30 [ 29.346454] [] do_double_fault+0x10b/0x210 [ 29.352307] [] double_fault+0x2d/0x40 [ 29.357733] [] ? dump_page_badflags+0x180/0x250 [ 29.364026] [] ? dump_page_badflags+0x8/0x250 [ 29.370134] <> [ 29.373574] Dumping ftrace buffer: [ 29.377400] (ftrace buffer empty) [ 29.381075] Kernel Offset: disabled [ 29.384676] Rebooting in 86400 seconds..