Public bug reported:
Since linux 7.0.0-31 (and still in 7.0.0-34) the machine hard-freezes
within ~10-25 minutes of normal desktop use. 7.0.0-29 and 7.0.0-30 are
unaffected; 7.0.0-15 had the same bug.
Sequence, identical every time:
1. Oops (GPF on non-canonical address, or page fault at fffffffffffffff0) at
path_is_under+0x50/0x90, reached from a plain newfstatat():
path_is_under <- complete_walk <- path_lookupat <- filename_lookup <-
vfs_statx <- vfs_fstatat <- __do_sys_newfstatat
Triggering task is a GLib worker thread (Comm: pool-2 / localsearch-3, the
GNOME file indexer).
2. The task dies inside the read_seqlock_excl(&mount_lock) critical section
("exited with preempt_count 1" / "exited with irqs disabled"), so mount_lock is
never released.
3. Every later task that touches mounts spins in
native_queued_spin_lock_slowpath: soft lockups on systemd, chrome, bwrap, runc
(mntput_no_expire_slowpath, drm_release), then RCU stalls, then total freeze.
Boot history on this machine (same NVIDIA 595.71.05 DKMS driver throughout):
7.0.0-15: 5 of 8 boots froze
7.0.0-29 / -30: 26 boots, 0 faults (18 with the indexer running)
7.0.0-31: 2 of 3 boots froze
7.0.0-34: froze 22 min after re-enabling localsearch-3
Reproduce: boot 7.0.0-34 with localsearch-3 enabled and use the desktop
normally (browser, Docker/bwrap sandboxes); freeze within ~25 min.
Masking localsearch-3 avoids it.
The full kernel log from the crashed boot is attached to the report as
CrashBootKernelLog.
Hardware: ASUS ROG STRIX Z690-I, BIOS 4505. Ubuntu 26.04.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2168783
Title:
Regression in 7.0.0-31/-34: GPF in path_is_under() leaks mount_lock,
system hard-freezes
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