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Date:   Wed, 16 Feb 2022 13:15:16 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        will@...nel.org, tglx@...utronix.de, rostedt@...dmis.org,
        joel@...lfernandes.org, sashal@...nel.org, daniel.vetter@...ll.ch,
        chris@...is-wilson.co.uk, duyuyang@...il.com,
        johannes.berg@...el.com, tj@...nel.org, willy@...radead.org,
        david@...morbit.com, amir73il@...il.com, bfields@...ldses.org,
        gregkh@...uxfoundation.org, kernel-team@....com,
        linux-mm@...ck.org, akpm@...ux-foundation.org, mhocko@...nel.org,
        minchan@...nel.org, hannes@...xchg.org, vdavydov.dev@...il.com,
        sj@...nel.org, jglisse@...hat.com, dennis@...nel.org, cl@...ux.com,
        penberg@...nel.org, rientjes@...gle.com, vbabka@...e.cz,
        ngupta@...are.org, linux-block@...r.kernel.org, axboe@...nel.dk,
        paolo.valente@...aro.org, josef@...icpanda.com,
        linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
        jack@...e.cz, jlayton@...nel.org, dan.j.williams@...el.com,
        hch@...radead.org, djwong@...nel.org,
        dri-devel@...ts.freedesktop.org, airlied@...ux.ie,
        rodrigosiqueiramelo@...il.com, melissa.srw@...il.com,
        hamohammed.sa@...il.com
Subject: Report in ext4_sync_file()

[    7.072624] ===================================================
[    7.072630] DEPT: Circular dependency has been detected.
[    7.072631] 5.17.0-rc1-00014-gcf3441bb2012 #2 Tainted: G        W        
[    7.072635] ---------------------------------------------------
[    7.072636] summary
[    7.072636] ---------------------------------------------------
[    7.072637] *** DEADLOCK ***
[    7.072637] 
[    7.072638] context A
[    7.072640]     [S] (unknown)(&(&journal->j_wait_commit)->dmap:0)
[    7.072643]     [W] folio_wait_bit_common(pgwriteback:0)
[    7.072644]     [E] event(&(&journal->j_wait_commit)->dmap:0)
[    7.072646] 
[    7.072647] context B
[    7.072647]     [S] __raw_write_lock(&journal->j_state_lock:8)
[    7.072649]     [W] wait(&(&journal->j_wait_commit)->dmap:0)
[    7.072654]     [E] write_unlock(&journal->j_state_lock:8)
[    7.072656] 
[    7.072657] context C
[    7.072658]     [S] (unknown)(pgwriteback:0)
[    7.072659]     [W] __raw_read_lock(&journal->j_state_lock:8)
[    7.072661]     [E] folio_wake_bit(pgwriteback:0)
[    7.072663] 
[    7.072663] [S]: start of the event context
[    7.072664] [W]: the wait blocked
[    7.072665] [E]: the event not reachable
[    7.072666] ---------------------------------------------------
[    7.072667] context A's detail
[    7.072668] ---------------------------------------------------
[    7.072669] context A
[    7.072670]     [S] (unknown)(&(&journal->j_wait_commit)->dmap:0)
[    7.072672]     [W] folio_wait_bit_common(pgwriteback:0)
[    7.072674]     [E] event(&(&journal->j_wait_commit)->dmap:0)
[    7.072675] 
[    7.072676] [S] (unknown)(&(&journal->j_wait_commit)->dmap:0):
[    7.072678] (N/A)
[    7.072679] 
[    7.072680] [W] folio_wait_bit_common(pgwriteback:0):
[    7.072681] [<ffffffff811ae2e2>] folio_wait_writeback+0x52/0xb0
[    7.072688] stacktrace:
[    7.072689]       folio_wait_bit+0x1ea/0x2a0
[    7.072692]       folio_wait_writeback+0x52/0xb0
[    7.072695]       __filemap_fdatawait_range+0x6d/0xc0
[    7.072701]       file_write_and_wait_range+0x90/0xc0
[    7.072703]       ext4_sync_file+0x1b5/0x410
[    7.072708]       do_fsync+0x33/0x60
[    7.072712]       __x64_sys_fsync+0xb/0x10
[    7.072715]       do_syscall_64+0x3a/0x90
[    7.072719]       entry_SYSCALL_64_after_hwframe+0x44/0xae
[    7.072723] 
[    7.072724] [E] event(&(&journal->j_wait_commit)->dmap:0):
[    7.072725] [<ffffffff810baa53>] __wake_up_common+0x93/0x1a0
[    7.072728] stacktrace:
[    7.072729]       dept_event+0x12b/0x1f0
[    7.072733]       __wake_up_common+0xb0/0x1a0
[    7.072735]       __wake_up_common_lock+0x65/0x90
[    7.072737]       __jbd2_log_start_commit+0x8a/0xa0
[    7.072740]       jbd2_log_start_commit+0x24/0x40
[    7.072742]       jbd2_complete_transaction+0x79/0x90
[    7.072745]       ext4_fc_commit+0x329/0x940
[    7.072748]       ext4_sync_file+0x29f/0x410
[    7.072751]       do_fsync+0x33/0x60
[    7.072754]       __x64_sys_fsync+0xb/0x10
[    7.072757]       do_syscall_64+0x3a/0x90
[    7.072759]       entry_SYSCALL_64_after_hwframe+0x44/0xae
[    7.072762] ---------------------------------------------------
[    7.072763] context B's detail
[    7.072764] ---------------------------------------------------
[    7.072765] context B
[    7.072766]     [S] __raw_write_lock(&journal->j_state_lock:8)
[    7.072768]     [W] wait(&(&journal->j_wait_commit)->dmap:0)
[    7.072769]     [E] write_unlock(&journal->j_state_lock:8)
[    7.072771] 
[    7.072772] [S] __raw_write_lock(&journal->j_state_lock:8):
[    7.072773] [<ffffffff81346e9e>] kjournald2+0x7e/0x260
[    7.072776] stacktrace:
[    7.072777]       _raw_write_lock+0x6e/0x90
[    7.072779]       kjournald2+0x7e/0x260
[    7.072781]       kthread+0xe3/0x110
[    7.072785]       ret_from_fork+0x22/0x30
[    7.072789] 
[    7.072789] [W] wait(&(&journal->j_wait_commit)->dmap:0):
[    7.072791] [<ffffffff810bb017>] prepare_to_wait+0x47/0xd0
[    7.072794] stacktrace:
[    7.072795]       kjournald2+0x164/0x260
[    7.072797]       kthread+0xe3/0x110
[    7.072800]       ret_from_fork+0x22/0x30
[    7.072802] 
[    7.072802] [E] write_unlock(&journal->j_state_lock:8):
[    7.072804] [<ffffffff8134700b>] kjournald2+0x1eb/0x260
[    7.072806] stacktrace:
[    7.072807]       _raw_write_unlock+0x30/0x70
[    7.072810]       kjournald2+0x1eb/0x260
[    7.072812]       kthread+0xe3/0x110
[    7.072814]       ret_from_fork+0x22/0x30
[    7.072816] ---------------------------------------------------
[    7.072817] context C's detail
[    7.072818] ---------------------------------------------------
[    7.072819] context C
[    7.072820]     [S] (unknown)(pgwriteback:0)
[    7.072822]     [W] __raw_read_lock(&journal->j_state_lock:8)
[    7.072823]     [E] folio_wake_bit(pgwriteback:0)
[    7.072825] 
[    7.072825] [S] (unknown)(pgwriteback:0):
[    7.072827] (N/A)
[    7.072828] 
[    7.072828] [W] __raw_read_lock(&journal->j_state_lock:8):
[    7.072830] [<ffffffff8133cd87>] start_this_handle+0xa7/0x5e0
[    7.072834] stacktrace:
[    7.072834]       _raw_read_lock+0x57/0xd0
[    7.072837]       start_this_handle+0xa7/0x5e0
[    7.072839]       jbd2_journal_start_reserved+0x4d/0x170
[    7.072842]       __ext4_journal_start_reserved+0x87/0x160
[    7.072845]       ext4_convert_unwritten_io_end_vec+0x26/0xb0
[    7.072848]       ext4_end_io_rsv_work+0xef/0x140
[    7.072850]       process_one_work+0x317/0x640
[    7.072852]       worker_thread+0x44/0x410
[    7.072854]       kthread+0xe3/0x110
[    7.072857]       ret_from_fork+0x22/0x30
[    7.072859] 
[    7.072860] [E] folio_wake_bit(pgwriteback:0):
[    7.072862] [<ffffffff811a30f2>] folio_end_writeback+0x32/0x80
[    7.072865] stacktrace:
[    7.072866]       folio_wake_bit+0x15e/0x170
[    7.072868]       folio_end_writeback+0x32/0x80
[    7.072870]       ext4_finish_bio+0x15a/0x200
[    7.072872]       ext4_release_io_end+0x41/0xe0
[    7.072874]       ext4_end_io_rsv_work+0xaf/0x140
[    7.072876]       process_one_work+0x317/0x640
[    7.072878]       worker_thread+0x44/0x410
[    7.072880]       kthread+0xe3/0x110
[    7.072883]       ret_from_fork+0x22/0x30
[    7.072885] ---------------------------------------------------
[    7.072886] information that might be helpful
[    7.072887] ---------------------------------------------------
[    7.072889] CPU: 1 PID: 620 Comm: cupsd Tainted: G        W         5.17.0-rc1-00014-gcf3441bb2012 #2
[    7.072893] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[    7.072894] Call Trace:
[    7.072896]  <TASK>
[    7.072898]  dump_stack_lvl+0x44/0x57
[    7.072902]  print_circle+0x384/0x510
[    7.072905]  ? print_circle+0x510/0x510
[    7.072908]  cb_check_dl+0x58/0x60
[    7.072936]  bfs+0xdc/0x1b0
[    7.072940]  add_dep+0x94/0x120
[    7.072944]  do_event.isra.22+0x284/0x300
[    7.072947]  ? __wake_up_common+0x93/0x1a0
[    7.072949]  dept_event+0x12b/0x1f0
[    7.072953]  __wake_up_common+0xb0/0x1a0
[    7.072956]  __wake_up_common_lock+0x65/0x90
[    7.072960]  __jbd2_log_start_commit+0x8a/0xa0
[    7.072963]  jbd2_log_start_commit+0x24/0x40
[    7.072966]  jbd2_complete_transaction+0x79/0x90
[    7.072969]  ext4_fc_commit+0x329/0x940
[    7.072972]  ? to_pool+0x6d/0xb0
[    7.072975]  ? pop_ecxt+0x104/0x110
[    7.072982]  ? dept_ecxt_exit+0xc0/0x140
[    7.072986]  ? _raw_read_unlock+0x4f/0x70
[    7.072989]  ext4_sync_file+0x29f/0x410
[    7.072994]  do_fsync+0x33/0x60
[    7.072997]  __x64_sys_fsync+0xb/0x10
[    7.073000]  do_syscall_64+0x3a/0x90
[    7.073003]  entry_SYSCALL_64_after_hwframe+0x44/0xae

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