| Message ID | 7c5345c3acb54ca6e02fdb2398d9af14a0bebd35.1724885694.git.wqu@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | btrfs: interrupt long running operations if the current process is freezing | expand |
On Thu, Aug 29, 2024 at 08:25:00AM +0930, Qu Wenruo wrote: > [BUG] > There is a bug report that running fstrim will prevent the system from > hibernation, result the following dmesg: > > PM: suspend entry (deep) > Filesystems sync: 0.060 seconds > Freezing user space processes > Freezing user space processes failed after 20.007 seconds (1 tasks refusing to freeze, wq_busy=0): > task:fstrim state:D stack:0 pid:15564 tgid:15564 ppid:1 flags:0x00004006 > Call Trace: > <TASK> > __schedule+0x381/0x1540 > schedule+0x24/0xb0 > schedule_timeout+0x1ea/0x2a0 > io_schedule_timeout+0x19/0x50 > wait_for_completion_io+0x78/0x140 > submit_bio_wait+0xaa/0xc0 > blkdev_issue_discard+0x65/0xb0 > btrfs_issue_discard+0xcf/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > btrfs_discard_extent+0x120/0x2a0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > do_trimming+0xd4/0x220 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > trim_bitmaps+0x418/0x520 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > btrfs_trim_block_group+0xcb/0x130 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > btrfs_trim_fs+0x119/0x460 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > btrfs_ioctl_fitrim+0xfb/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > btrfs_ioctl+0x11cc/0x29f0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] > __x64_sys_ioctl+0x92/0xd0 > do_syscall_64+0x5b/0x80 > entry_SYSCALL_64_after_hwframe+0x7c/0xe6 > RIP: 0033:0x7f5f3b529f9b > RSP: 002b:00007fff279ebc20 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fff279ebd60 RCX: 00007f5f3b529f9b > RDX: 00007fff279ebc90 RSI: 00000000c0185879 RDI: 0000000000000003 > RBP: 000055748718b2d0 R08: 00005574871899e8 R09: 00007fff279eb010 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 > R13: 000055748718ac40 R14: 000055748718b290 R15: 000055748718b290 > </TASK> > OOM killer enabled. > Restarting tasks ... done. > random: crng reseeded on system resumption > PM: suspend exit > PM: suspend entry (s2idle) > Filesystems sync: 0.047 seconds > > [CAUSE] > PM code is freezing all user space processes before entering > hibernation/suspension, but if a user space process is trapping into the > kernel for a long running operation, it will not be frozen since it's > still inside kernel. > > Normally those long running operations check for fatal signals and exit > early, but freezing user space processes is not done by signals but a > different infrastructure. > > Unfortunately btrfs only checks fatal signals but not if the current > task is being frozen. > > [FIX] > Introduce a helper, btrfs_interrupted(), to check both fatal signals and > freezing status, and apply to all long running operations, with > dedicated error code: > > - reflink (-EINTR) > - fstrim (-ERESTARTSYS) > - relocation (-ECANCELD) > - llseek (-EINTR) > - defrag (-EAGAIN) > - fiemap (-EINTR) > > Reported-by: Rolf Wentland <R.Wentland@gmx.de> > Link: https://bugzilla.suse.com/show_bug.cgi?id=1229737 > Signed-off-by: Qu Wenruo <wqu@suse.com> I don't love the name, can we call it something like btrfs_task_interrupted() or something? I don't want people to get confused about what it's doing. Once you rename it you can put Reviewed-by: Josef Bacik <josef@toxicpanda.com> on it, thanks, Josef
在 2024/8/29 08:56, Josef Bacik 写道: > On Thu, Aug 29, 2024 at 08:25:00AM +0930, Qu Wenruo wrote: >> [BUG] >> There is a bug report that running fstrim will prevent the system from >> hibernation, result the following dmesg: >> >> PM: suspend entry (deep) >> Filesystems sync: 0.060 seconds >> Freezing user space processes >> Freezing user space processes failed after 20.007 seconds (1 tasks refusing to freeze, wq_busy=0): >> task:fstrim state:D stack:0 pid:15564 tgid:15564 ppid:1 flags:0x00004006 >> Call Trace: >> <TASK> >> __schedule+0x381/0x1540 >> schedule+0x24/0xb0 >> schedule_timeout+0x1ea/0x2a0 >> io_schedule_timeout+0x19/0x50 >> wait_for_completion_io+0x78/0x140 >> submit_bio_wait+0xaa/0xc0 >> blkdev_issue_discard+0x65/0xb0 >> btrfs_issue_discard+0xcf/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> btrfs_discard_extent+0x120/0x2a0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> do_trimming+0xd4/0x220 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> trim_bitmaps+0x418/0x520 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> btrfs_trim_block_group+0xcb/0x130 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> btrfs_trim_fs+0x119/0x460 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> btrfs_ioctl_fitrim+0xfb/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> btrfs_ioctl+0x11cc/0x29f0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] >> __x64_sys_ioctl+0x92/0xd0 >> do_syscall_64+0x5b/0x80 >> entry_SYSCALL_64_after_hwframe+0x7c/0xe6 >> RIP: 0033:0x7f5f3b529f9b >> RSP: 002b:00007fff279ebc20 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 >> RAX: ffffffffffffffda RBX: 00007fff279ebd60 RCX: 00007f5f3b529f9b >> RDX: 00007fff279ebc90 RSI: 00000000c0185879 RDI: 0000000000000003 >> RBP: 000055748718b2d0 R08: 00005574871899e8 R09: 00007fff279eb010 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 >> R13: 000055748718ac40 R14: 000055748718b290 R15: 000055748718b290 >> </TASK> >> OOM killer enabled. >> Restarting tasks ... done. >> random: crng reseeded on system resumption >> PM: suspend exit >> PM: suspend entry (s2idle) >> Filesystems sync: 0.047 seconds >> >> [CAUSE] >> PM code is freezing all user space processes before entering >> hibernation/suspension, but if a user space process is trapping into the >> kernel for a long running operation, it will not be frozen since it's >> still inside kernel. >> >> Normally those long running operations check for fatal signals and exit >> early, but freezing user space processes is not done by signals but a >> different infrastructure. >> >> Unfortunately btrfs only checks fatal signals but not if the current >> task is being frozen. >> >> [FIX] >> Introduce a helper, btrfs_interrupted(), to check both fatal signals and >> freezing status, and apply to all long running operations, with >> dedicated error code: >> >> - reflink (-EINTR) >> - fstrim (-ERESTARTSYS) >> - relocation (-ECANCELD) >> - llseek (-EINTR) >> - defrag (-EAGAIN) >> - fiemap (-EINTR) >> >> Reported-by: Rolf Wentland <R.Wentland@gmx.de> >> Link: https://bugzilla.suse.com/show_bug.cgi?id=1229737 >> Signed-off-by: Qu Wenruo <wqu@suse.com> > > I don't love the name, can we call it something like > > btrfs_task_interrupted() > > or something? I don't want people to get confused about what it's doing. Once > you rename it you can put > > Reviewed-by: Josef Bacik <josef@toxicpanda.com> Sure, would go btrfs_task_interrupted() instead. Thanks for the review, Qu > > on it, thanks, > > Josef >
diff --git a/fs/btrfs/defrag.h b/fs/btrfs/defrag.h index 878528e086fb..70b3df35aea2 100644 --- a/fs/btrfs/defrag.h +++ b/fs/btrfs/defrag.h @@ -5,6 +5,7 @@ #include <linux/types.h> #include <linux/compiler_types.h> +#include "misc.h" struct inode; struct file_ra_state; @@ -26,7 +27,7 @@ int btrfs_defrag_root(struct btrfs_root *root); static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) { - return signal_pending(current); + return signal_pending(current) || btrfs_interrupted(); } #endif diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index feec49e6f9c8..08e5df8c7de3 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4,7 +4,6 @@ */ #include <linux/sched.h> -#include <linux/sched/signal.h> #include <linux/pagemap.h> #include <linux/writeback.h> #include <linux/blkdev.h> @@ -6459,7 +6458,7 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, u64 *trimmed) start += len; *trimmed += bytes; - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { ret = -ERESTARTSYS; break; } diff --git a/fs/btrfs/fiemap.c b/fs/btrfs/fiemap.c index df7f09f3b02e..372db4e718d1 100644 --- a/fs/btrfs/fiemap.c +++ b/fs/btrfs/fiemap.c @@ -794,7 +794,7 @@ static int extent_fiemap(struct btrfs_inode *inode, prev_extent_end = extent_end; next_item: - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { ret = -EINTR; goto out_unlock; } diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 76f4cc686af9..b915aedbe58a 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -3676,7 +3676,7 @@ static loff_t find_desired_extent(struct file *file, loff_t offset, int whence) start = extent_end; last_extent_end = extent_end; path->slots[0]++; - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { ret = -EINTR; goto out; } diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index eaa1dbd31352..da26fee0eb97 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -5,7 +5,6 @@ #include <linux/pagemap.h> #include <linux/sched.h> -#include <linux/sched/signal.h> #include <linux/slab.h> #include <linux/math64.h> #include <linux/ratelimit.h> @@ -3809,7 +3808,7 @@ static int trim_no_bitmap(struct btrfs_block_group *block_group, if (async && *total_trimmed) break; - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { ret = -ERESTARTSYS; break; } @@ -4000,7 +3999,7 @@ static int trim_bitmaps(struct btrfs_block_group *block_group, } block_group->discard_cursor = start; - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { if (start != offset) reset_trimming_bitmap(ctl, offset); ret = -ERESTARTSYS; diff --git a/fs/btrfs/misc.h b/fs/btrfs/misc.h index 0d599fd847c9..2c0b8ef63445 100644 --- a/fs/btrfs/misc.h +++ b/fs/btrfs/misc.h @@ -9,6 +9,8 @@ #include <linux/wait.h> #include <linux/math64.h> #include <linux/rbtree.h> +#include <linux/sched/signal.h> +#include <linux/freezer.h> /* * Enumerate bits using enum autoincrement. Define the @name as the n-th bit. @@ -163,4 +165,9 @@ static inline bool bitmap_test_range_all_zero(const unsigned long *addr, return (found_set == start + nbits); } +static inline bool btrfs_interrupted(void) +{ + return fatal_signal_pending(current) || freezing(current); +} + #endif diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c index df6b93b927cd..11c05c94c580 100644 --- a/fs/btrfs/reflink.c +++ b/fs/btrfs/reflink.c @@ -564,7 +564,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode, btrfs_release_path(path); key.offset = prev_extent_end; - if (fatal_signal_pending(current)) { + if (btrfs_interrupted()) { ret = -EINTR; goto out; } diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index ea4ed85919ec..17bcda566da8 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -2936,7 +2936,7 @@ noinline int btrfs_should_cancel_balance(const struct btrfs_fs_info *fs_info) { return atomic_read(&fs_info->balance_cancel_req) || atomic_read(&fs_info->reloc_cancel_req) || - fatal_signal_pending(current); + btrfs_interrupted(); } ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE);
[BUG] There is a bug report that running fstrim will prevent the system from hibernation, result the following dmesg: PM: suspend entry (deep) Filesystems sync: 0.060 seconds Freezing user space processes Freezing user space processes failed after 20.007 seconds (1 tasks refusing to freeze, wq_busy=0): task:fstrim state:D stack:0 pid:15564 tgid:15564 ppid:1 flags:0x00004006 Call Trace: <TASK> __schedule+0x381/0x1540 schedule+0x24/0xb0 schedule_timeout+0x1ea/0x2a0 io_schedule_timeout+0x19/0x50 wait_for_completion_io+0x78/0x140 submit_bio_wait+0xaa/0xc0 blkdev_issue_discard+0x65/0xb0 btrfs_issue_discard+0xcf/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] btrfs_discard_extent+0x120/0x2a0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] do_trimming+0xd4/0x220 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] trim_bitmaps+0x418/0x520 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] btrfs_trim_block_group+0xcb/0x130 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] btrfs_trim_fs+0x119/0x460 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] btrfs_ioctl_fitrim+0xfb/0x160 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] btrfs_ioctl+0x11cc/0x29f0 [btrfs 7ab35b9b86062a46f6ff578bb32d55ecf8e6bf82] __x64_sys_ioctl+0x92/0xd0 do_syscall_64+0x5b/0x80 entry_SYSCALL_64_after_hwframe+0x7c/0xe6 RIP: 0033:0x7f5f3b529f9b RSP: 002b:00007fff279ebc20 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff279ebd60 RCX: 00007f5f3b529f9b RDX: 00007fff279ebc90 RSI: 00000000c0185879 RDI: 0000000000000003 RBP: 000055748718b2d0 R08: 00005574871899e8 R09: 00007fff279eb010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 000055748718ac40 R14: 000055748718b290 R15: 000055748718b290 </TASK> OOM killer enabled. Restarting tasks ... done. random: crng reseeded on system resumption PM: suspend exit PM: suspend entry (s2idle) Filesystems sync: 0.047 seconds [CAUSE] PM code is freezing all user space processes before entering hibernation/suspension, but if a user space process is trapping into the kernel for a long running operation, it will not be frozen since it's still inside kernel. Normally those long running operations check for fatal signals and exit early, but freezing user space processes is not done by signals but a different infrastructure. Unfortunately btrfs only checks fatal signals but not if the current task is being frozen. [FIX] Introduce a helper, btrfs_interrupted(), to check both fatal signals and freezing status, and apply to all long running operations, with dedicated error code: - reflink (-EINTR) - fstrim (-ERESTARTSYS) - relocation (-ECANCELD) - llseek (-EINTR) - defrag (-EAGAIN) - fiemap (-EINTR) Reported-by: Rolf Wentland <R.Wentland@gmx.de> Link: https://bugzilla.suse.com/show_bug.cgi?id=1229737 Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/defrag.h | 3 ++- fs/btrfs/extent-tree.c | 3 +-- fs/btrfs/fiemap.c | 2 +- fs/btrfs/file.c | 2 +- fs/btrfs/free-space-cache.c | 5 ++--- fs/btrfs/misc.h | 7 +++++++ fs/btrfs/reflink.c | 2 +- fs/btrfs/relocation.c | 2 +- 8 files changed, 16 insertions(+), 10 deletions(-)