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I am Chaitanya from the linux graphics team in >>> Intel. >>> >>> This mail is regarding a regression we are seeing in our CI runs[1] on >>> linux-next repository. >>> >>> Since the version next-20260324 [2], we are seeing the following regression >>> >>> ````````````````````````````````````````````````````````````````````````````````` >>> <5>[ 157.361977] [IGT] Inactivity timeout exceeded. Killing the current >>> test with SIGQUIT. >>> <6>[ 157.362097] sysrq: HELP : loglevel(0-9) reboot(b) crash(c) >>> show-all-locks(d) terminate-all-tasks(e) memory-full-oom-kill(f) >>> kill-all-tasks(i) thaw-filesystems(j) sak(k) >>> show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) >>> poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) >>> show-task-states(t) unmount(u) force-fb(v) show-blocked-tasks(w) >>> dump-ftrace-buffer(z) replay-kernel-logs(R) >>> <6>[ 157.399543] sysrq: Show State >>> <6>[ 157.403061] task:systemd state:S stack:0 pid:1 tgid:1 >>> ppid:0 task_flags:0x400100 flags:0x00080000 >>> <6>[ 157.403067] Call Trace: >>> <6>[ 157.403069] >>> <6>[ 157.403072] __schedule+0x5d7/0x1ef0 >>> <6>[ 157.403078] ? lock_acquire+0xc4/0x300 >>> <6>[ 157.403084] ? schedule+0x10e/0x180 >>> <6>[ 157.403087] ? lock_release+0xcd/0x2b0 >>> <6>[ 157.403092] schedule+0x3a/0x180 >>> <6>[ 157.403094] schedule_hrtimeout_range_clock+0x112/0x120 >>> <6>[ 157.403097] ? do_epoll_wait+0x3e4/0x5b0 >>> <6>[ 157.403102] ? lock_release+0xcd/0x2b0 >>> <6>[ 157.403104] ? _raw_spin_unlock_irq+0x27/0x70 >>> <6>[ 157.403106] ? do_epoll_wait+0x3e4/0x5b0 >>> <6>[ 157.403110] schedule_hrtimeout_range+0x13/0x30 >>> ````````````````````````````````````````````````````````````````````````````````` >>> Details log can be found in [3]. >>> >>> After bisecting the tree, the following patch [4] seems to be the first >>> "bad" commit >>> >>> ````````````````````````````````````````````````````````````````````````````````````````````````````````` >>> commit 25500ba7e77ce9d3d9b5a1929d41a2ee2e23f6fe >>> Author: Matthew Wilcox (Oracle) willy@infradead.org >>> Date:   Thu Mar 5 19:55:43 2026 +0000 >>> >>>     locking/mutex: Remove the list_head from struct mutex >>> ````````````````````````````````````````````````````````````````````````````````````````````````````````` >>> >>> We could not revert the patch because of merge conflict but resetting to the >>> parent of the commit seems to fix the issue. >>> >>> Could you please check why the patch causes this regression and provide a >>> fix if necessary? >> >> Does this help? > > More tidy version of the same... > > --- > diff --git a/kernel/locking/ww_mutex.h b/kernel/locking/ww_mutex.h > index b1834ab7e782..bb8b410779d4 100644 > --- a/kernel/locking/ww_mutex.h > +++ b/kernel/locking/ww_mutex.h > @@ -42,7 +42,7 @@ __ww_waiter_last(struct mutex *lock) > struct mutex_waiter *w = lock->first_waiter; > > if (w) > - w = list_prev_entry(w, list); > + w = __ww_waiter_prev(lock, w); > return w; > } > Thank you for the response, Peter. Unfortunately, the issue is still seen with this change. Regards Chaitanya