In the Linux kernel, the following vulnerability has been resolved: btrfs: ensure pages are unlocked on cowfilerange() failure There is a hungtask report on zoned btrfs like below. https://github.com/naota/linux/issues/59 [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds. [726.329839] Not tainted 5.16.0-rc1+ #1 [726.330484] "echo 0 > /proc/sys/kernel/hungtasktimeoutsecs" disables this message. [726.331603] task:rocksdb:high0 state:D stack: 0 pid:11085 ppid: 11082 flags:0x00000000 [726.331608] Call Trace: [726.331611] <TASK> [726.331614] _schedule+0x2e5/0x9d0 [726.331622] schedule+0x58/0xd0 [726.331626] ioschedule+0x3f/0x70 [726.331629] _foliolock+0x125/0x200 [726.331634] ? findgetentries+0x1bc/0x240 [726.331638] ? filemapinvalidateunlocktwo+0x40/0x40 [726.331642] truncateinodepagesrange+0x5b2/0x770 [726.331649] truncateinodepagesfinal+0x44/0x50 [726.331653] btrfsevictinode+0x67/0x480 [726.331658] evict+0xd0/0x180 [726.331661] iput+0x13f/0x200 [726.331664] dounlinkat+0x1c0/0x2b0 [726.331668] _x64sysunlink+0x23/0x30 [726.331670] dosyscall64+0x3b/0xc0 [726.331674] entrySYSCALL64afterhwframe+0x44/0xae [726.331677] RIP: 0033:0x7fb9490a171b [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIGRAX: 0000000000000057 [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300 [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000 [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000 [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260 [726.331693] </TASK> While we debug the issue, we found running fstests generic/551 on 5GB non-zoned nullblk device in the emulated zoned mode also had a similar hung issue. Also, we can reproduce the same symptom with an error injected cowfilerange() setup. The hang occurs when cowfilerange() fails in the middle of allocation. cowfilerange() called from doallocationzoned() can split the give region ([start, end]) for allocation depending on current block group usages. When btrfs can allocate bytes for one part of the split regions but fails for the other region (e.g. because of -ENOSPC), we return the error leaving the pages in the succeeded regions locked. Technically, this occurs only when @unlock == 0. Otherwise, we unlock the pages in an allocated region after creating an ordered extent. Considering the callers of cowfilerange(unlock=0) won't write out the pages, we can unlock the pages on error exit from cowfilerange(). So, we can ensure all the pages except @lockedpage are unlocked on error case. In summary, cowfilerange now behaves like this: - pagestarted == 1 (return value) - All the pages are unlocked. IO is started. - unlock == 1 - All the pages except @lockedpage are unlocked in any case - unlock == 0 - On success, all the pages are locked for writing out them - On failure, all the pages except @locked_page are unlocked
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