Ming Lei d578c770c8 block: avoid calling blkg_free() in atomic context ... blkg_free() can currently be called in atomic context, either spin lock is held, or run in rcu callback. Meantime either request queue's release handler or ->pd_free_fn can sleep. Fix the issue by scheduling a work function for freeing blkcg_gq the instance. [ 148.553894] BUG: sleeping function called from invalid context at block/blk-sysfs.c:767 [ 148.557381] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/13 [ 148.560741] preempt_count: 101, expected: 0 [ 148.562577] RCU nest depth: 0, expected: 0 [ 148.564379] 1 lock held by swapper/13/0: [ 148.566127] #0: ffffffff82615f80 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x1b [ 148.569640] Preemption disabled at: [ 148.569642] [<ffffffff8123f9c3>] ___slab_alloc+0x554/0x661 [ 148.573559] CPU: 13 PID: 0 Comm: swapper/13 Kdump: loaded Not tainted 5.17.0_up+ #110 [ 148.576834] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1.fc33 04/01/2014 [ 148.579768] Call Trace: [ 148.580567] <IRQ> [ 148.581262] dump_stack_lvl+0x56/0x7c [ 148.582367] ? ___slab_alloc+0x554/0x661 [ 148.583526] __might_resched+0x1af/0x1c8 [ 148.584678] blk_release_queue+0x24/0x109 [ 148.585861] kobject_cleanup+0xc9/0xfe [ 148.586979] blkg_free+0x46/0x63 [ 148.587962] rcu_do_batch+0x1c5/0x3db [ 148.589057] rcu_core+0x14a/0x184 [ 148.590065] __do_softirq+0x14d/0x2c7 [ 148.591167] __irq_exit_rcu+0x7a/0xd4 [ 148.592264] sysvec_apic_timer_interrupt+0x82/0xa5 [ 148.593649] </IRQ> [ 148.594354] <TASK> [ 148.595058] asm_sysvec_apic_timer_interrupt+0x12/0x20 Cc: Tejun Heo <tj@kernel.org> Fixes: 0a9a25ca78 ("block: let blkcg_gq grab request queue's refcnt") Reported-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/linux-block/20220322093322.GA27283@lst.de/ Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20220323011308.2010380-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>		2022-03-22 19:52:23 -06:00
..
acpi	USB/Thunderbolt changes for 5.17-rc1	2022-01-12 11:27:57 -08:00
asm-generic	bitmap patches for 5.17-rc1	2022-01-23 06:20:44 +02:00
clocksource
crypto	lib/crypto: blake2s: move hmac construction into wireguard	2022-01-18 13:03:55 +01:00
drm	Merge tag 'drm-msm-next-2021-12-26' of ssh://gitlab.freedesktop.org/drm/msm into drm-next	2021-12-29 14:02:44 +10:00
dt-bindings	Char/Misc and other driver changes for 5.17-rc1	2022-01-14 16:02:28 +01:00
keys	keys: X.509 public key issuer lookup without AKID	2022-01-09 00:18:42 +02:00
kunit	kunit: replace kernel.h with the necessary inclusions	2022-01-20 08:52:54 +02:00
kvm	RISCV:	2022-01-16 16:15:14 +02:00
linux	block: avoid calling blkg_free() in atomic context	2022-03-22 19:52:23 -06:00
math-emu
media
memory
misc
net	ipv4: remove sparse error in ip_neigh_gw4()	2022-01-27 08:38:33 -08:00
pcmcia
ras	mm/hwpoison: remove MF_MSG_BUDDY_2ND and MF_MSG_POISONED_HUGE	2022-01-15 16:30:31 +02:00
rdma	RDMA/core: Calculate UDP source port based on flow label or lqpn/rqpn	2022-01-07 19:34:01 -04:00
scsi	scsi: don't use disk->private_data to find the scsi_driver	2022-03-08 19:40:00 -07:00
soc	Networking changes for 5.17.	2022-01-10 19:06:09 -08:00
sound	ASoC: Updates for v5.17	2022-01-10 14:33:42 +01:00
target
trace	block: introduce block_rq_error tracepoint	2022-02-11 10:00:16 -07:00
uapi	TTY/Serial driver fixes for 5.17-rc2	2022-01-29 15:23:13 +02:00
vdso
video
xen	xen: branch for v5.17-rc1	2022-01-12 16:42:00 -08:00