[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.714329] 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: [ 22.446086] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.986362] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.955263] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) [ 24.103370] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. executing program executing program [ 29.616402] ================================================================== [ 29.623793] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.630776] Read of size 8 at addr ffff8801d52191c0 by task syzkaller099780/3324 [ 29.638283] [ 29.639888] CPU: 1 PID: 3324 Comm: syzkaller099780 Not tainted 4.4.112-g3fc4284 #32 [ 29.647658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.657005] 0000000000000000 33481be366af9762 ffff8801d095f9f0 ffffffff81d054ed [ 29.664995] ffffea0007548640 ffff8801d52191c0 0000000000000000 ffff8801d52191c0 [ 29.672960] ffff8801d2662338 ffff8801d095fa28 ffffffff814fd953 ffff8801d52191c0 [ 29.680932] Call Trace: [ 29.683494] [] dump_stack+0xc1/0x124 [ 29.688828] [] print_address_description+0x73/0x260 [ 29.695461] [] kasan_report+0x285/0x370 [ 29.701067] [] ? sg_remove_request+0xf9/0x110 [ 29.707189] [] __asan_report_load8_noabort+0x14/0x20 [ 29.713914] [] sg_remove_request+0xf9/0x110 [ 29.719854] [] sg_finish_rem_req+0x295/0x340 [ 29.725882] [] sg_read+0xa21/0x1490 [ 29.731131] [] ? __check_object_size+0x154/0x35b [ 29.737505] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.744139] [] ? fsnotify+0xee0/0xee0 [ 29.749560] [] ? avc_policy_seqno+0x9/0x20 [ 29.755415] [] do_loop_readv_writev+0x141/0x1e0 [ 29.761704] [] ? security_file_permission+0x89/0x1e0 [ 29.768439] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.775088] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.781726] [] do_readv_writev+0x5dd/0x6e0 [ 29.787579] [] ? vfs_write+0x530/0x530 [ 29.793087] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.799027] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 29.806018] [] ? __fget+0x20b/0x3b0 [ 29.811266] [] ? __fget+0x232/0x3b0 [ 29.816513] [] ? __fget+0x47/0x3b0 [ 29.821674] [] vfs_readv+0x78/0xb0 [ 29.826844] [] SyS_readv+0xd9/0x240 [ 29.832104] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 29.838654] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 29.845203] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.851750] [ 29.853350] Allocated by task 0: [ 29.856680] (stack is not available) [ 29.860360] [ 29.861958] Freed by task 0: [ 29.864943] (stack is not available) [ 29.868621] [ 29.870219] The buggy address belongs to the object at ffff8801d5219180 [ 29.870219] which belongs to the cache fasync_cache of size 96 [ 29.882854] The buggy address is located 64 bytes inside of [ 29.882854] 96-byte region [ffff8801d5219180, ffff8801d52191e0) [ 29.894520] The buggy address belongs to the page: [ 31.316696] PANIC: double fault, error_code: 0x0 [ 31.321473] CPU: 1 PID: 3324 Comm: syzkaller099780 Not tainted 4.4.112-g3fc4284 #32 [ 31.329246] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.338577] task: ffff8800b57b8000 task.stack: ffff8801d0958000 [ 31.344689] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 31.353449] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.358877] RAX: ffff8800b57b8000 RBX: ffffea0007548640 RCX: ffffffff8148fea0 [ 31.366119] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0007548640 [ 31.373360] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 31.380603] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 31.387843] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 31.395091] FS: 00007fa54857e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.403285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.409136] CR2: ffff8800fffffff8 CR3: 00000000b5f8a000 CR4: 0000000000160670 [ 31.416380] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.423621] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.430869] Stack: [ 31.432985] [ 31.434580] Call Trace: [ 31.437131] [ 31.439158] 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 [ 31.466275] Kernel panic - not syncing: Machine halted. [ 31.471612] CPU: 1 PID: 3324 Comm: syzkaller099780 Not tainted 4.4.112-g3fc4284 #32 [ 31.479373] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.488697] 0000000000000000 33481be366af9762 ffff8801db30ce38 ffffffff81d054ed [ 31.496665] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 31.504645] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 31.512649] Call Trace: [ 31.515199] <#DF> [] dump_stack+0xc1/0x124 [ 31.521278] [] panic+0x1aa/0x388 [ 31.526264] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.533173] [] ? vprintk_emit+0x242/0x850 [ 31.538943] [] ? dump_page_badflags+0x1d/0x250 [ 31.545151] [] ? vprintk_emit+0x242/0x850 [ 31.550918] [] df_debug+0x2d/0x30 [ 31.555990] [] do_double_fault+0x10b/0x210 [ 31.561856] [] double_fault+0x2d/0x40 [ 31.567284] [] ? dump_page_badflags+0x180/0x250 [ 31.573570] [] ? dump_page_badflags+0x8/0x250 [ 31.579680] <> [ 31.583109] Dumping ftrace buffer: [ 31.586980] (ftrace buffer empty) [ 31.590661] Kernel Offset: disabled [ 31.594269] Rebooting in 86400 seconds..