[....] Starting enhanced syslogd: rsyslogd[ 9.221025] audit: type=1400 audit(1513533014.622:4): avc: denied { syslog } for pid=3162 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Starting mcstransd:
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added 'ci-android-49-kasan-gce-1,10.128.0.47' (ECDSA) to the list of known hosts.
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syzkaller login: [ 17.472541]
[ 17.472846] ======================================================
[ 17.473693] [ INFO: possible circular locking dependency detected ]
[ 17.474559] 4.9.69-g3f1d77c #108 Not tainted
[ 17.475150] -------------------------------------------------------
[ 17.476004] syzkaller314931/3616 is trying to acquire lock:
[ 17.476755] (&p->lock){+.+.+.}, at: [<ffffffff815e4f1d>] seq_read+0xdd/0x1290
[ 17.477860] but task is already holding lock:
[ 17.478476] (&pipe->mutex/1){+.+.+.}, at: [<ffffffff815850a6>] pipe_lock+0x56/0x70
[ 17.479655] which lock already depends on the new lock.
[ 17.479655]
[ 17.480572]
[ 17.480572] the existing dependency chain (in reverse order) is:
[ 17.481566]
-> #2 (&pipe->mutex/1){+.+.+.}:
[ 17.482346] lock_acquire+0x12e/0x410
[ 17.482921] mutex_lock_nested+0xbb/0x870
[ 17.483551] fifo_open+0x15c/0xa30
[ 17.484096] do_dentry_open+0x607/0xc60
[ 17.484704] vfs_open+0x105/0x220
[ 17.485234] path_openat+0x5ac/0x2910
[ 17.485807] do_filp_open+0x197/0x290
[ 17.486388] do_open_execat+0xfa/0x4d0
[ 17.486991] do_execveat_common.isra.37+0x6d6/0x1f10
[ 17.487731] SyS_execve+0x42/0x50
[ 17.488260] do_syscall_64+0x197/0x490
[ 17.488873] return_from_SYSCALL_64+0x0/0x7a
[ 17.489522]
-> #1 (&sig->cred_guard_mutex){+.+.+.}:
[ 17.490352] lock_acquire+0x12e/0x410
[ 17.490973] mutex_lock_killable_nested+0xcc/0x960
[ 17.491722] do_io_accounting+0x1f4/0x860
[ 17.492341] proc_tgid_io_accounting+0x22/0x30
[ 17.493014] proc_single_show+0xf8/0x170
[ 17.497557] seq_read+0x32f/0x1290
[ 17.501588] __vfs_read+0x103/0x670
[ 17.505707] vfs_read+0x11e/0x380
[ 17.509645] SyS_read+0xd9/0x1b0
[ 17.513503] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 17.518743]
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-> #0 (&p->lock){+.+.+.}:
[ 17.523143] __lock_acquire+0x2bf9/0x3640
[ 17.527774] lock_acquire+0x12e/0x410
[ 17.532058] mutex_lock_nested+0xbb/0x870
[ 17.536689] seq_read+0xdd/0x1290
[ 17.540628] do_loop_readv_writev.part.17+0x141/0x1e0
[ 17.546302] do_readv_writev+0x520/0x750
[ 17.550846] vfs_readv+0x84/0xc0
[ 17.554697] default_file_splice_read+0x43f/0x7a0
[ 17.560022] do_splice_to+0x10a/0x160
[ 17.564310] SyS_splice+0xf5f/0x1520
[ 17.568516] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 17.573758]
[ 17.573758] other info that might help us debug this:
[ 17.573758]
[ 17.581867] Chain exists of:
&p->lock --> &sig->cred_guard_mutex --> &pipe->mutex/1
[ 17.590842] Possible unsafe locking scenario:
[ 17.590842]
[ 17.596878] CPU0 CPU1
[ 17.601510] ---- ----
[ 17.606137] lock(&pipe->mutex/1);
[ 17.610063] lock(&sig->cred_guard_mutex);
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[ 17.617088] lock(&pipe->mutex/1);
[ 17.623529] lock(&p->lock);
[ 17.626839]
[ 17.626839] *** DEADLOCK ***
[ 17.626839]
[ 17.632869] 1 lock held by syzkaller314931/3616:
[ 17.637587] #0: (&pipe->mutex/1){+.+.+.}, at: [<ffffffff815850a6>] pipe_lock+0x56/0x70
[ 17.646372]
[ 17.646372] stack backtrace:
[ 17.650838] CPU: 0 PID: 3616 Comm: syzkaller314931 Not tainted 4.9.69-g3f1d77c #108
[ 17.658596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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[ 17.667926] ffff8801c3ef7308 ffffffff81d90a29 ffffffff85356b40 ffffffff85389a50
[ 17.675872] ffffffff8538ff90 ffff8801c3ee38d8 ffff8801c3ee3000 ffff8801c3ef7350
[ 17.683815] ffffffff81235c41 ffff8801c3ee38d8 00000000c3ee38b0 ffff8801c3ee38d8
[ 17.691768] Call Trace:
[ 17.694329] [<ffffffff81d90a29>] dump_stack+0xc1/0x128
[ 17.699661] [<ffffffff81235c41>] print_circular_bug+0x271/0x310
[ 17.705772] [<ffffffff8123c079>] __lock_acquire+0x2bf9/0x3640
[ 17.711709] [<ffffffff81239480>] ? debug_check_no_locks_freed+0x2c0/0x2c0
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[ 17.718689] [<ffffffff838aa335>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[ 17.725580] [<ffffffff81e3fa41>] ? depot_save_stack+0x3b1/0x4a0
[ 17.731688] [<ffffffff81232151>] ? __lock_is_held+0xa1/0xf0
[ 17.737451] [<ffffffff8123d4fe>] lock_acquire+0x12e/0x410
[ 17.743041] [<ffffffff815e4f1d>] ? seq_read+0xdd/0x1290
[ 17.748469] [<ffffffff815e4f1d>] ? seq_read+0xdd/0x1290
[ 17.753893] [<ffffffff838a060b>] mutex_lock_nested+0xbb/0x870
[ 17.759833] [<ffffffff815e4f1d>] ? seq_read+0xdd/0x1290
[ 17.765251] [<ffffffff838a0550>] ? mutex_lock_killable_nested+0x960/0x960
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[ 17.772227] [<ffffffff81232151>] ? __lock_is_held+0xa1/0xf0
[ 17.777993] [<ffffffff815e4f1d>] seq_read+0xdd/0x1290
[ 17.783234] [<ffffffff81232151>] ? __lock_is_held+0xa1/0xf0
[ 17.788996] [<ffffffff815e4e40>] ? seq_escape+0x200/0x200
[ 17.794585] [<ffffffff8163f836>] ? fsnotify+0x86/0xf30
[ 17.799918] [<ffffffff816406e0>] ? fsnotify+0xf30/0xf30
[ 17.805335] [<ffffffff81bd8029>] ? avc_policy_seqno+0x9/0x20
[ 17.811192] [<ffffffff81568ef1>] do_loop_readv_writev.part.17+0x141/0x1e0
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[ 17.818178] [<ffffffff81bcf0e9>] ? security_file_permission+0x89/0x1e0
[ 17.824900] [<ffffffff815e4e40>] ? seq_escape+0x200/0x200
[ 17.830490] [<ffffffff815e4e40>] ? seq_escape+0x200/0x200
[ 17.836081] [<ffffffff8156cd60>] do_readv_writev+0x520/0x750
[ 17.841931] [<ffffffff8156c840>] ? vfs_write+0x530/0x530
[ 17.847434] [<ffffffff81539855>] ? kasan_unpoison_shadow+0x35/0x50
[ 17.853804] [<ffffffff81dcfd82>] ? push_pipe+0x372/0x770
[ 17.859308] [<ffffffff81dce5af>] ? sanity+0x1ff/0x610
[ 17.864904] [<ffffffff81dd1287>] ? iov_iter_get_pages_alloc+0x2c7/0xf10
[ 17.871710] [<ffffffff8156d014>] vfs_readv+0x84/0xc0
[ 17.876871] [<ffffffff8160c0af>] default_file_splice_read+0x43f/0x7a0
[ 17.883511] [<ffffffff8160bc70>] ? do_splice_direct+0x270/0x270
[ 17.889634] [<ffffffff81bcf0e9>] ? security_file_permission+0x89/0x1e0
[ 17.896354] [<ffffffff8160bc70>] ? do_splice_direct+0x270/0x270
[ 17.902467] [<ffffffff8160b1aa>] do_splice_to+0x10a/0x160
[ 17.908059] [<ffffffff81610f1f>] SyS_splice+0xf5f/0x1520
[ 17.913562] [<ffffffff8160ffc0>] ? compat_SyS_vmsplice+0x240/0x240
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[ 17.919932] [<ffffffff81238c4b>] ? trace_hardirqs_on_caller+0x38b/0x590
[ 17.926738] [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 17.933291] [<ffffffff838aab05>] entry_SYSCALL_64_fastpath+0x23/0xc6
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