[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Sh[ 15.316968] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) ell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.348979] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.699897] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.667763] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) [ 22.835705] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) [ 25.335415] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.213' (ECDSA) to the list of known hosts. executing program [ 28.331764] ================================================================== [ 28.339153] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.346139] Read of size 8 at addr ffff8800b5632140 by task syzkaller260995/3311 [ 28.353640] [ 28.355272] CPU: 1 PID: 3311 Comm: syzkaller260995 Not tainted 4.4.112-gca0ebb4 #29 [ 28.363034] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.372360] 0000000000000000 3e9b55770a1c3377 ffff8801d0287ab0 ffffffff81d056fd [ 28.380344] ffffea0002d58c80 ffff8800b5632140 0000000000000000 ffff8800b5632140 [ 28.388317] ffff8801d025a338 ffff8801d0287ae8 ffffffff814fd953 ffff8800b5632140 [ 28.396285] Call Trace: [ 28.398846] [] dump_stack+0xc1/0x124 [ 28.404181] [] print_address_description+0x73/0x260 [ 28.410822] [] kasan_report+0x285/0x370 [ 28.416420] [] ? sg_remove_request+0xf9/0x110 [ 28.422536] [] __asan_report_load8_noabort+0x14/0x20 [ 28.429261] [] sg_remove_request+0xf9/0x110 [ 28.435210] [] sg_finish_rem_req+0x295/0x340 [ 28.441238] [] sg_read+0xa21/0x1490 [ 28.446485] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.453132] [] ? new_slab+0x2df/0x3b0 [ 28.458555] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.465200] [] __vfs_read+0x103/0x440 [ 28.470623] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.477620] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.483568] [] ? fsnotify+0x5ad/0xee0 [ 28.488991] [] ? fsnotify+0xee0/0xee0 [ 28.494420] [] ? lockdep_init_map+0xeb/0x1690 [ 28.500541] [] ? avc_policy_seqno+0x9/0x20 [ 28.506397] [] ? selinux_file_permission+0x348/0x460 [ 28.513119] [] ? security_file_permission+0x89/0x1e0 [ 28.519841] [] ? rw_verify_area+0x100/0x2f0 [ 28.525787] [] vfs_read+0x123/0x3a0 [ 28.531032] [] SyS_read+0xd9/0x1b0 [ 28.536194] [] ? do_sendfile+0xd30/0xd30 [ 28.541876] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.548342] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.554894] [ 28.556492] Allocated by task 0: [ 28.559822] (stack is not available) [ 28.563505] [ 28.565102] Freed by task 0: [ 28.568087] (stack is not available) [ 28.571767] [ 28.573366] The buggy address belongs to the object at ffff8800b5632100 [ 28.573366] which belongs to the cache fasync_cache of size 96 [ 28.585992] The buggy address is located 64 bytes inside of [ 28.585992] 96-byte region [ffff8800b5632100, ffff8800b5632160) [ 28.597660] The buggy address belongs to the page: [ 30.111699] PANIC: double fault, error_code: 0x0 [ 30.116478] CPU: 1 PID: 3311 Comm: syzkaller260995 Not tainted 4.4.112-gca0ebb4 #29 [ 30.124239] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.133567] task: ffff8800b5742f80 task.stack: ffff8801d0280000 [ 30.139593] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.148344] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.153760] RAX: ffff8800b5742f80 RBX: ffffea0002d58c80 RCX: ffffffff8148fea0 [ 30.161000] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0002d58c80 [ 30.168248] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.175488] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 30.182758] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 30.190007] FS: 0000000002220880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.198205] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.204064] CR2: ffff8800fffffff8 CR3: 00000000b4f5c000 CR4: 0000000000160670 [ 30.211306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.218549] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.225788] Stack: [ 30.227904] [ 30.229502] Call Trace: [ 30.232052] [ 30.234080] 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 [ 30.261035] Kernel panic - not syncing: Machine halted. [ 30.266380] CPU: 1 PID: 3311 Comm: syzkaller260995 Not tainted 4.4.112-gca0ebb4 #29 [ 30.274145] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.283472] 0000000000000000 3e9b55770a1c3377 ffff8801db30ce38 ffffffff81d056fd [ 30.291445] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.299422] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 30.307407] Call Trace: [ 30.309963] <#DF> [] dump_stack+0xc1/0x124 [ 30.316035] [] panic+0x1aa/0x388 [ 30.321023] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.327923] [] ? vprintk_emit+0x242/0x850 [ 30.333694] [] ? dump_page_badflags+0x1d/0x250 [ 30.339901] [] ? vprintk_emit+0x242/0x850 [ 30.345678] [] df_debug+0x2d/0x30 [ 30.350767] [] do_double_fault+0x10b/0x210 [ 30.356634] [] double_fault+0x2d/0x40 [ 30.362063] [] ? dump_page_badflags+0x180/0x250 [ 30.368356] [] ? dump_page_badflags+0x8/0x250 [ 30.374467] <> [ 30.377936] Dumping ftrace buffer: [ 30.381798] (ftrace buffer empty) [ 30.385477] Kernel Offset: disabled [ 30.389088] Rebooting in 86400 seconds..