From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 202883] New: sometime dead lock in getdents64
Date: Tue, 12 Mar 2019 06:41:08 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=202883
Bug ID: 202883
Summary: sometime dead lock in getdents64
Product: File System
Version: 2.5
Kernel Version: f2fs-dev
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: f2fs
Assignee: filesystem_f2fs@kernel-bugs.kernel.org
Reporter: jiqun.li@unisoc.com
Regression: No
sometimes, dead lock when make system call SYS_getdents64 with fsync() is
called by another process.
monkey running on android9.0
1. task 9785 held sbi->cp_rwsem and waiting lock_page()
2. task 10349 held mm_sem and waiting sbi->cp_rwsem
3. task 9709 held lock_page() and waiting mm_sem
so this is a dead lock scenario.
task stack is show by crash tools as following
crash_arm64> bt ffffffc03c354080
PID: 9785 TASK: ffffffc03c354080 CPU: 1 COMMAND: "RxIoScheduler-3"
#0 [ffffffc01b50f8a0] __switch_to at ffffff8008086d88
#1 [ffffffc01b50f8c0] __schedule at ffffff8008a90840
#2 [ffffffc01b50f920] schedule at ffffff8008a90f2c
#3 [ffffffc01b50f940] schedule_timeout at ffffff8008a940ec
#4 [ffffffc01b50f9f0] io_schedule_timeout at ffffff8008a90544
#5 [ffffffc01b50fa20] bit_wait_io at ffffff8008a913b4
#6 [ffffffc01b50fa40] __wait_on_bit_lock at ffffff8008a91574
>> #7 [ffffffc01b50fac0] __lock_page at ffffff80081b11e8
#8 [ffffffc01b50fb30] f2fs_sync_node_pages at ffffff8008387d08
#9 [ffffffc01b50fc50] f2fs_write_checkpoint at ffffff8008376620
#10 [ffffffc01b50fd30] f2fs_sync_fs at ffffff800836b030
#11 [ffffffc01b50fda0] f2fs_do_sync_file at ffffff8008358a30
#12 [ffffffc01b50fe50] f2fs_sync_file at ffffff80083591c4
#13 [ffffffc01b50fe90] sys_fsync at ffffff800824cffc
crash-arm64> bt 10349
PID: 10349 TASK: ffffffc018b83080 CPU: 1 COMMAND: "BUGLY_ASYNC_UPL"
#0 [ffffffc01f8cf9a0] __switch_to at ffffff8008086d88
#1 [ffffffc01f8cf9c0] __schedule at ffffff8008a90840
#2 [ffffffc01f8cfa20] schedule at ffffff8008a90f2c
>> #3 [ffffffc01f8cfa40] rwsem_down_read_failed at ffffff8008a93afc
#4 [ffffffc01f8cfab0] down_read at ffffff8008a93360
#5 [ffffffc01f8cfad0] __do_map_lock at ffffff800837e758
#6 [ffffffc01f8cfb00] f2fs_vm_page_mkwrite at ffffff8008359c14
#7 [ffffffc01f8cfb90] do_page_mkwrite at ffffff80081e09cc
#8 [ffffffc01f8cfc10] do_wp_page at ffffff80081e2de8
#9 [ffffffc01f8cfcb0] handle_mm_fault at ffffff80081e5228
#10 [ffffffc01f8cfd80] do_page_fault at ffffff800809d05c
#11 [ffffffc01f8cfdf0] do_mem_abort at ffffff8008081570
#12 [ffffffc01f8cfed0] el0_da at ffffff8008085650
PC: 00000033 LR: 00000000 SP: 00000000 PSTATE: ffffffffffffffff
crash-arm64> bt 9709
PID: 9709 TASK: ffffffc03e7f3080 CPU: 1 COMMAND: "IntentService[A"
#0 [ffffffc001e677b0] __switch_to at ffffff8008086d88
#1 [ffffffc001e677d0] __schedule at ffffff8008a90840
#2 [ffffffc001e67830] schedule at ffffff8008a90f2c
>> #3 [ffffffc001e67850] rwsem_down_read_failed at ffffff8008a93afc
#4 [ffffffc001e678c0] down_read at ffffff8008a93360
#5 [ffffffc001e678e0] do_page_fault at ffffff800809ceb8
#6 [ffffffc001e67950] do_translation_fault at ffffff800809d250
#7 [ffffffc001e67980] do_mem_abort at ffffff8008081570
>> #8 [ffffffc001e67b80] el1_ia at ffffff8008084fc4
PC: ffffff8008274114 [compat_filldir64+120]
LR: ffffff80083584d4 [f2fs_fill_dentries+448]
SP: ffffffc001e67b80 PSTATE: 80400145
X29: ffffffc001e67b80 X28: 0000000000000000 X27: 000000000000001a
X26: 00000000000093d7 X25: ffffffc070d52480 X24: 0000000000000008
X23: 0000000000000028 X22: 00000000d43dfd60 X21: ffffffc001e67e90
X20: 0000000000000011 X19: ffffff80093a4000 X18: 0000000000000000
X17: 0000000000000000 X16: 0000000000000000 X15: 0000000000000000
X14: ffffffffffffffff X13: 0000000000000008 X12: 0101010101010101
X11: 7f7f7f7f7f7f7f7f X10: 6a6a6a6a6a6a6a6a X9: 7f7f7f7f7f7f7f7f
X8: 0000000080808000 X7: ffffff800827409c X6: 0000000080808000
X5: 0000000000000008 X4: 00000000000093d7 X3: 000000000000001a
X2: 0000000000000011 X1: ffffffc070d52480 X0: 0000000000800238
>> #9 [ffffffc001e67be0] f2fs_fill_dentries at ffffff80083584d0
#10 [ffffffc001e67ca0] f2fs_read_inline_dir at ffffff8008372ca4
#11 [ffffffc001e67d20] f2fs_readdir at ffffff80083588a0
#12 [ffffffc001e67de0] iterate_dir at ffffff8008228e90
#13 [ffffffc001e67e30] compat_sys_getdents64 at ffffff8008278894
#14 [ffffffc001e67ed0] __sys_trace at ffffff8008085b48
PC: 0000003c LR: 00000000 SP: 00000000 PSTATE: 000000d9
X12: f48a02ff X11: d4678960 X10: d43dfc00 X9: d4678ae4
X8: 00000058 X7: d4678994 X6: d43de800 X5: 000000d9
X4: d43dfc0c X3: d43dfc10 X2: d46799c8 X1: 00000000
X0: 00001068
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