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Date: Wed, 16 Feb 2022 13:17:04 +0900
From: Byungchul Park <byungchul.park@....com>
To: davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org
Cc: torvalds@...ux-foundation.org, mingo@...hat.com,
linux-kernel@...r.kernel.org, peterz@...radead.org,
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hamohammed.sa@...il.com
Subject: Report in unix_stream_sendmsg()
[ 7.008968] ===================================================
[ 7.008973] DEPT: Circular dependency has been detected.
[ 7.008974] 5.17.0-rc1-00014-gcf3441bb2012 #2 Tainted: G W
[ 7.008975] ---------------------------------------------------
[ 7.008976] summary
[ 7.008976] ---------------------------------------------------
[ 7.008980] *** DEADLOCK ***
[ 7.008980]
[ 7.008981] context A
[ 7.008982] [S] (unknown)(&(&ei->socket.wq.wait)->dmap:0)
[ 7.008983] [W] __raw_spin_lock(&u->lock:0)
[ 7.008984] [E] event(&(&ei->socket.wq.wait)->dmap:0)
[ 7.008986]
[ 7.008986] context B
[ 7.008987] [S] __raw_spin_lock(&u->lock:0)
[ 7.008988] [W] wait(&(&ei->socket.wq.wait)->dmap:0)
[ 7.008989] [E] spin_unlock(&u->lock:0)
[ 7.008990]
[ 7.008991] [S]: start of the event context
[ 7.008991] [W]: the wait blocked
[ 7.008992] [E]: the event not reachable
[ 7.008992] ---------------------------------------------------
[ 7.008993] context A's detail
[ 7.008994] ---------------------------------------------------
[ 7.008994] context A
[ 7.008995] [S] (unknown)(&(&ei->socket.wq.wait)->dmap:0)
[ 7.008996] [W] __raw_spin_lock(&u->lock:0)
[ 7.008997] [E] event(&(&ei->socket.wq.wait)->dmap:0)
[ 7.008998]
[ 7.008999] [S] (unknown)(&(&ei->socket.wq.wait)->dmap:0):
[ 7.009000] (N/A)
[ 7.009000]
[ 7.009001] [W] __raw_spin_lock(&u->lock:0):
[ 7.009002] [<ffffffff81aa5c24>] unix_stream_sendmsg+0x294/0x590
[ 7.009006] stacktrace:
[ 7.009007] _raw_spin_lock+0x4b/0x90
[ 7.009010] unix_stream_sendmsg+0x294/0x590
[ 7.009011] sock_sendmsg+0x56/0x60
[ 7.009015] sock_write_iter+0x82/0xe0
[ 7.009017] new_sync_write+0x16d/0x190
[ 7.009020] vfs_write+0x134/0x360
[ 7.009022] ksys_write+0xa6/0xc0
[ 7.009023] do_syscall_64+0x3a/0x90
[ 7.009026] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 7.009028]
[ 7.009028] [E] event(&(&ei->socket.wq.wait)->dmap:0):
[ 7.009029] [<ffffffff810baa53>] __wake_up_common+0x93/0x1a0
[ 7.009031] stacktrace:
[ 7.009032] dept_event+0x12b/0x1f0
[ 7.009035] __wake_up_common+0xb0/0x1a0
[ 7.009036] __wake_up_common_lock+0x65/0x90
[ 7.009037] sock_def_readable+0x5c/0xe0
[ 7.009040] unix_stream_sendmsg+0x19a/0x590
[ 7.009041] sock_sendmsg+0x56/0x60
[ 7.009043] sock_write_iter+0x82/0xe0
[ 7.009045] new_sync_write+0x16d/0x190
[ 7.009047] vfs_write+0x134/0x360
[ 7.009049] ksys_write+0xa6/0xc0
[ 7.009050] do_syscall_64+0x3a/0x90
[ 7.009052] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 7.009054] ---------------------------------------------------
[ 7.009054] context B's detail
[ 7.009055] ---------------------------------------------------
[ 7.009057] context B
[ 7.009057] [S] __raw_spin_lock(&u->lock:0)
[ 7.009059] [W] wait(&(&ei->socket.wq.wait)->dmap:0)
[ 7.009060] [E] spin_unlock(&u->lock:0)
[ 7.009061]
[ 7.009061] [S] __raw_spin_lock(&u->lock:0):
[ 7.009062] [<ffffffff81aa451f>] unix_stream_read_generic+0x6bf/0xb60
[ 7.009066] stacktrace:
[ 7.009067] _raw_spin_lock+0x6e/0x90
[ 7.009068] unix_stream_read_generic+0x6bf/0xb60
[ 7.009071] unix_stream_recvmsg+0x40/0x50
[ 7.009073] sock_read_iter+0x85/0xd0
[ 7.009074] new_sync_read+0x162/0x180
[ 7.009076] vfs_read+0xf3/0x190
[ 7.009078] ksys_read+0xa6/0xc0
[ 7.009079] do_syscall_64+0x3a/0x90
[ 7.009081] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 7.009083]
[ 7.009084] [W] wait(&(&ei->socket.wq.wait)->dmap:0):
[ 7.009085] [<ffffffff810bb017>] prepare_to_wait+0x47/0xd0
[ 7.009087] stacktrace:
[ 7.009087] unix_stream_read_generic+0x6fa/0xb60
[ 7.009089] unix_stream_recvmsg+0x40/0x50
[ 7.009091] sock_read_iter+0x85/0xd0
[ 7.009093] new_sync_read+0x162/0x180
[ 7.009095] vfs_read+0xf3/0x190
[ 7.009097] ksys_read+0xa6/0xc0
[ 7.009098] do_syscall_64+0x3a/0x90
[ 7.009100] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 7.009102]
[ 7.009102] [E] spin_unlock(&u->lock:0):
[ 7.009103] [<ffffffff81aa45df>] unix_stream_read_generic+0x77f/0xb60
[ 7.009106] stacktrace:
[ 7.009107] _raw_spin_unlock+0x30/0x70
[ 7.009108] unix_stream_read_generic+0x77f/0xb60
[ 7.009110] unix_stream_recvmsg+0x40/0x50
[ 7.009113] sock_read_iter+0x85/0xd0
[ 7.009114] new_sync_read+0x162/0x180
[ 7.009116] vfs_read+0xf3/0x190
[ 7.009118] ksys_read+0xa6/0xc0
[ 7.009119] do_syscall_64+0x3a/0x90
[ 7.009121] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 7.009123] ---------------------------------------------------
[ 7.009124] information that might be helpful
[ 7.009124] ---------------------------------------------------
[ 7.009125] CPU: 2 PID: 641 Comm: avahi-daemon Tainted: G W 5.17.0-rc1-00014-gcf3441bb2012 #2
[ 7.009128] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[ 7.009129] Call Trace:
[ 7.009130] <TASK>
[ 7.009131] dump_stack_lvl+0x44/0x57
[ 7.009134] print_circle+0x384/0x510
[ 7.009136] ? print_circle+0x510/0x510
[ 7.009138] cb_check_dl+0x58/0x60
[ 7.009139] bfs+0xdc/0x1b0
[ 7.009142] add_dep+0x94/0x120
[ 7.009144] do_event.isra.22+0x284/0x300
[ 7.009146] ? __wake_up_common+0x93/0x1a0
[ 7.009147] dept_event+0x12b/0x1f0
[ 7.009149] __wake_up_common+0xb0/0x1a0
[ 7.009151] __wake_up_common_lock+0x65/0x90
[ 7.009153] sock_def_readable+0x5c/0xe0
[ 7.009155] unix_stream_sendmsg+0x19a/0x590
[ 7.009158] sock_sendmsg+0x56/0x60
[ 7.009160] sock_write_iter+0x82/0xe0
[ 7.009163] new_sync_write+0x16d/0x190
[ 7.009166] vfs_write+0x134/0x360
[ 7.009169] ksys_write+0xa6/0xc0
[ 7.009170] ? trace_hardirqs_on+0x38/0xe0
[ 7.009173] do_syscall_64+0x3a/0x90
[ 7.009175] entry_SYSCALL_64_after_hwframe+0x44/0xae
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