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Subject: LTP zram tests triggers might_sleep splat - bisects to 0a9a25ca7843
 ("block: let blkcg_gq grab request queue's refcnt")
From:   Mike Galbraith <efault@gmx.de>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Christoph Hellwig <hch@lst.de>
Date:   Mon, 28 Mar 2022 06:21:51 +0200
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Splat bisected cleanly, verified with a revert afterward.

(note: "Preemption disabled at:" address tracking looked to be pretty
broken during bisection, so...)

[   50.659919] zram: Added device: zram0
[   50.670989] zram0: detected capacity change from 0 to 51200
[   50.684383] EXT4-fs (zram0): mounted filesystem with ordered data mode. Quota mode: none.
[   50.684393] ext4 filesystem being mounted at /tmp/LTP_zram01.4SaesNmV2L/zram0 supports timestamps until 2038 (0x7fffffff)
[   63.090651] zram0: detected capacity change from 51200 to 0
[   63.092612] zram: Removed device: zram0
[   63.164735] BUG: sleeping function called from invalid context at block/blk-sysfs.c:766
[   63.164742] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/0
[   63.164744] preempt_count: 101, expected: 0
[   63.164745] RCU nest depth: 0, expected: 0
[   63.164747] Preemption disabled at:
[   63.164747] [<ffffffff8181757e>] schedule_preempt_disabled+0x1e/0x20
[   63.164754] CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Tainted: G        W   E     5.17.0.gf0228146-master #73 f6f3a9d86c34a7a5254509d9115123082e5393e5
[   63.164758] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/23/2013
[   63.164760] Call Trace:
[   63.164763]  <IRQ>
[   63.164765]  dump_stack_lvl+0x33/0x42
[   63.164769]  ? schedule_preempt_disabled+0x1e/0x20
[   63.164771]  __might_resched+0x15e/0x1b0
[   63.164776]  blk_release_queue+0x22/0xf0
[   63.164779]  kobject_put+0xa4/0x210
[   63.164783]  blkg_free.part.25+0x41/0x60
[   63.164787]  rcu_do_batch+0x167/0x470
[   63.164791]  rcu_core+0x1f8/0x3a0
[   63.164793]  __do_softirq+0xef/0x2df
[   63.164797]  irq_exit_rcu+0xcf/0xe0
[   63.164802]  sysvec_apic_timer_interrupt+0x9e/0xc0
[   63.164806]  </IRQ>
[   63.164807]  <TASK>
[   63.164808]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[   63.164811] RIP: 0010:cpuidle_enter_state+0xd6/0x380
[   63.164815] Code: 49 89 c4 0f 1f 44 00 00 31 ff e8 65 20 aa ff 45 84 ff 74 12 9c 58 f6 c4 02 0f 85 95 02 00 00 31 ff e8 0e 0a af ff fb 45 85 f6 <0f> 88 69 01 00 00 49 63 d6 4c 2b 24 24 48 8d 04 52 48 8d 04 82 49
[   63.164818] RSP: 0018:ffffffff82403e58 EFLAGS: 00000206
[   63.164821] RAX: ffff88840ec00000 RBX: 0000000000000005 RCX: 000000000000001f
[   63.164823] RDX: 0000000eb4e90091 RSI: ffffffff8217eea1 RDI: ffffffff82162998
[   63.164827] RBP: ffff88840ec37500 R08: 0000000000000002 R09: 000000000002da80
[   63.164829] R10: ffffffff82403e38 R11: 0000000000000edb R12: 0000000eb4e90091
[   63.164831] R13: ffffffff825a1360 R14: 0000000000000005 R15: 0000000000000000
[   63.164835]  ? cpuidle_enter_state+0xbb/0x380
[   63.164839]  cpuidle_enter+0x29/0x40
[   63.164842]  do_idle+0x1c6/0x210
[   63.164847]  cpu_startup_entry+0x19/0x20
[   63.164851]  start_kernel+0x884/0x896
[   63.164856]  ? apply_microcode_early+0xcb/0xf0
[   63.164859]  ? load_ucode_intel_bsp+0x28/0x2d
[   63.164863]  secondary_startup_64_no_verify+0xc3/0xcb
[   63.164868]  </TASK>