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Chao Yu 1fd916e879 f2fs: fix to avoid deadlock of atomic file operations 
commit 48432984d7 upstream.

Thread A				Thread B
- __fput
 - f2fs_release_file
  - drop_inmem_pages
   - mutex_lock(&fi->inmem_lock)
   - __revoke_inmem_pages
    - lock_page(page)
					- open
					- f2fs_setattr
					- truncate_setsize
					 - truncate_inode_pages_range
					  - lock_page(page)
					  - truncate_cleanup_page
					   - f2fs_invalidate_page
					    - drop_inmem_page
					    - mutex_lock(&fi->inmem_lock);

We may encounter above ABBA deadlock as reported by Kyungtae Kim:

I'm reporting a bug in linux-4.17.19: "INFO: task hung in
drop_inmem_page" (no reproducer)

I think this might be somehow related to the following:
https://groups.google.com/forum/#!searchin/syzkaller-bugs/INFO$3A$20task$20hung$20in$20%7Csort:date/syzkaller-bugs/c6soBTrdaIo/AjAzPeIzCgAJ

=========================================
INFO: task syz-executor7:10822 blocked for more than 120 seconds.
      Not tainted 4.17.19 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D27024 10822   6346 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2867 [inline]
 __schedule+0x721/0x1e60 kernel/sched/core.c:3515
 schedule+0x88/0x1c0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0x18/0x30 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x5bd/0x1410 kernel/locking/mutex.c:893
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:908
 drop_inmem_page+0xcb/0x810 fs/f2fs/segment.c:327
 f2fs_invalidate_page+0x337/0x5e0 fs/f2fs/data.c:2401
 do_invalidatepage mm/truncate.c:165 [inline]
 truncate_cleanup_page+0x261/0x330 mm/truncate.c:187
 truncate_inode_pages_range+0x552/0x1610 mm/truncate.c:367
 truncate_inode_pages mm/truncate.c:478 [inline]
 truncate_pagecache+0x6d/0x90 mm/truncate.c:801
 truncate_setsize+0x81/0xa0 mm/truncate.c:826
 f2fs_setattr+0x44f/0x1270 fs/f2fs/file.c:781
 notify_change+0xa62/0xe80 fs/attr.c:313
 do_truncate+0x12e/0x1e0 fs/open.c:63
 do_last fs/namei.c:2955 [inline]
 path_openat+0x2042/0x29f0 fs/namei.c:3505
 do_filp_open+0x1bd/0x2c0 fs/namei.c:3540
 do_sys_open+0x35e/0x4e0 fs/open.c:1101
 __do_sys_open fs/open.c:1119 [inline]
 __se_sys_open fs/open.c:1114 [inline]
 __x64_sys_open+0x89/0xc0 fs/open.c:1114
 do_syscall_64+0xc4/0x4e0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4497b9
RSP: 002b:00007f734e459c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f734e45a6cc RCX: 00000000004497b9
RDX: 0000000000000104 RSI: 00000000000a8280 RDI: 0000000020000080
RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000007230 R14: 00000000006f02d0 R15: 00007f734e45a700
INFO: task syz-executor7:10858 blocked for more than 120 seconds.
      Not tainted 4.17.19 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D28880 10858   6346 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2867 [inline]
 __schedule+0x721/0x1e60 kernel/sched/core.c:3515
 schedule+0x88/0x1c0 kernel/sched/core.c:3559
 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:565 [inline]
 rwsem_down_write_failed+0x5e6/0xc90 kernel/locking/rwsem-xadd.c:594
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0x58/0xa0 kernel/locking/rwsem.c:72
 inode_lock include/linux/fs.h:713 [inline]
 do_truncate+0x120/0x1e0 fs/open.c:61
 do_last fs/namei.c:2955 [inline]
 path_openat+0x2042/0x29f0 fs/namei.c:3505
 do_filp_open+0x1bd/0x2c0 fs/namei.c:3540
 do_sys_open+0x35e/0x4e0 fs/open.c:1101
 __do_sys_open fs/open.c:1119 [inline]
 __se_sys_open fs/open.c:1114 [inline]
 __x64_sys_open+0x89/0xc0 fs/open.c:1114
 do_syscall_64+0xc4/0x4e0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4497b9
RSP: 002b:00007f734e3b4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f734e3b56cc RCX: 00000000004497b9
RDX: 0000000000000104 RSI: 00000000000a8280 RDI: 0000000020000080
RBP: 000000000071c238 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000007230 R14: 00000000006f02d0 R15: 00007f734e3b5700
INFO: task syz-executor5:10829 blocked for more than 120 seconds.
      Not tainted 4.17.19 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D28760 10829   6308 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2867 [inline]
 __schedule+0x721/0x1e60 kernel/sched/core.c:3515
 schedule+0x88/0x1c0 kernel/sched/core.c:3559
 io_schedule+0x21/0x80 kernel/sched/core.c:5179
 wait_on_page_bit_common mm/filemap.c:1100 [inline]
 __lock_page+0x2b5/0x390 mm/filemap.c:1273
 lock_page include/linux/pagemap.h:483 [inline]
 __revoke_inmem_pages+0xb35/0x11c0 fs/f2fs/segment.c:231
 drop_inmem_pages+0xa3/0x3e0 fs/f2fs/segment.c:306
 f2fs_release_file+0x2c7/0x330 fs/f2fs/file.c:1556
 __fput+0x2c7/0x780 fs/file_table.c:209
 ____fput+0x1a/0x20 fs/file_table.c:243
 task_work_run+0x151/0x1d0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x8ba/0x30a0 kernel/exit.c:865
 do_group_exit+0x13b/0x3a0 kernel/exit.c:968
 get_signal+0x6bb/0x1650 kernel/signal.c:2482
 do_signal+0x84/0x1b70 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x155/0x190 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x445/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4497b9
RSP: 002b:00007f1c68e74ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bf80 RCX: 00000000004497b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 000000000071bf80 R08: 0000000000000000 R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1c68e759c0 R15: 00007f1c68e75700

This patch tries to use trylock_page to mitigate such deadlock condition
for fix.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-27 14:14:42 +09:00
..
acl.c f2fs: fix wrong return value of f2fs_acl_create 2019-02-12 19:47:02 +01:00
acl.h f2fs: remove dead code f2fs_check_acl 2016-09-14 16:52:36 -07:00
checkpoint.c f2fs: fix to flush all dirty inodes recovered in readonly fs 2018-11-13 11:08:38 -08:00
data.c f2fs: fix race between write_checkpoint and write_begin 2019-02-12 19:47:02 +01:00
debug.c f2fs: Allocate and stat mem used by free nid bitmap more accurately 2018-07-28 18:23:26 -07:00
dir.c f2fs: rework fault injection handling to avoid a warning 2018-08-14 09:49:15 -07:00
extent_cache.c f2fs: avoid sleeping under spin_lock 2018-11-13 11:08:37 -08:00
f2fs.h f2fs: fix sbi->extent_list corruption issue 2019-02-12 19:47:17 +01:00
file.c f2fs: wait on atomic writes to count F2FS_CP_WB_DATA 2019-03-19 13:12:41 +01:00
gc.c f2fs: readahead encrypted block during GC 2018-08-20 23:13:42 -07:00
gc.h f2fs: introduce sbi->gc_mode to determine the policy 2018-05-31 11:31:51 -07:00
hash.c f2fs: check entire encrypted bigname when finding a dentry 2017-05-04 11:44:35 -04:00
inline.c f2fs: fix to propagate error from __get_meta_page() 2018-08-01 11:52:36 -07:00
inode.c f2fs: fix to recover cold bit of inode block during POR 2018-11-13 11:08:39 -08:00
Kconfig fs/*/Kconfig: drop links to 404-compliant http://acl.bestbits.at 2018-01-01 12:45:37 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
namei.c f2fs: Replace strncpy with memcpy 2018-07-28 18:26:08 -07:00
node.c f2fs: read page index before freeing 2019-01-09 17:38:46 +01:00
node.h f2fs: let checkpoint flush dnode page of regular 2018-08-01 11:52:36 -07:00
recovery.c f2fs: fix to flush all dirty inodes recovered in readonly fs 2018-11-13 11:08:38 -08:00
segment.c f2fs: fix to avoid deadlock of atomic file operations 2019-03-27 14:14:42 +09:00
segment.h f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc 2018-08-20 23:13:42 -07:00
shrinker.c f2fs: fix sbi->extent_list corruption issue 2019-02-12 19:47:17 +01:00
super.c f2fs: fix use-after-free issue when accessing sbi->stat_info 2019-02-12 19:47:17 +01:00
sysfs.c f2fs: fix performance issue observed with multi-thread sequential read 2018-08-20 23:13:42 -07:00
trace.c f2fs: fix potential hangtask in f2fs_trace_pid 2018-01-02 19:27:30 -08:00
trace.h
xattr.c f2fs: sanity check of xattr entry size 2019-01-09 17:38:46 +01:00
xattr.h f2fs: guard macro variables with braces 2017-04-10 19:48:10 -07:00