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Wed, 10 Jun 2026 06:28:00 -0700 (PDT) Date: Wed, 10 Jun 2026 15:27:58 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Longxing Li Cc: syzkaller@googlegroups.com, tj@kernel.org, hannes@cmpxchg.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [Kernel Bug] INFO: task hung in cgroup_drain_dying Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="w4tp5jy54e7czoz5" Content-Disposition: inline In-Reply-To: --w4tp5jy54e7czoz5 Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [Kernel Bug] INFO: task hung in cgroup_drain_dying MIME-Version: 1.0 On Wed, Jun 10, 2026 at 03:11:41PM +0800, Longxing Li wrote: > sorry for not containing full information in last email. the config[1] > and report[2] are as follows. CONFIG_PROVE_LOCKING is not enabled in > our config. Thanks. > INFO: task systemd:1 blocked for more than 143 seconds. > Not tainted 7.0.6 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:systemd state:D stack:20616 pid:1 tgid:1 ppid:0 > task_flags:0x400100 flags:0x00080001 > Call Trace: > > context_switch kernel/sched/core.c:5298 [inline] > __schedule+0x1006/0x5f00 kernel/sched/core.c:6911 > __schedule_loop kernel/sched/core.c:6993 [inline] > schedule+0xe7/0x3a0 kernel/sched/core.c:7008 > cgroup_drain_dying+0x1ed/0x360 kernel/cgroup/cgroup.c:6294 > cgroup_rmdir+0x38/0x300 kernel/cgroup/cgroup.c:6309 > kernfs_iop_rmdir+0x10a/0x180 fs/kernfs/dir.c:1311 > vfs_rmdir fs/namei.c:5344 [inline] > vfs_rmdir+0x340/0x860 fs/namei.c:5317 > filename_rmdir+0x3be/0x510 fs/namei.c:5399 > __do_sys_rmdir fs/namei.c:5422 [inline] > __se_sys_rmdir fs/namei.c:5419 [inline] > __x64_sys_rmdir+0x47/0x90 fs/namei.c:5419 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x11b/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f Hm, hm, this kinds fits 93618edf75383 ("cgroup: Defer css percpu_ref kill on rmdir until cgroup is depopulated")=20 which got into stable 7.0.9. Can you reproduce even with that (or newer) kernel? Michal --w4tp5jy54e7czoz5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCailmWhsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+Ai+RwD+KgjxjaFYvdaedvEs/Vba 72UxvBJX1p8Drk7TVCmg79MBAMhMnWaO7V+jqBFg3SUY7mXWwWtLU7lfL3JAzJLw v40B =LwIs -----END PGP SIGNATURE----- --w4tp5jy54e7czoz5--