[syzbot ci] Re: mm: switch THP shrinker to list_lru

[syzbot ci]

syzbot ci has tested the following series

[v2] mm: switch THP shrinker to list_lru
https://lore.kernel.org/all/20260312205321....@cmpxchg.org
* [PATCH v2 1/7] mm: list_lru: lock_list_lru_of_memcg() cannot return NULL if !skip_empty
* [PATCH v2 2/7] mm: list_lru: deduplicate unlock_list_lru()
* [PATCH v2 3/7] mm: list_lru: move list dead check to lock_list_lru_of_memcg()
* [PATCH v2 4/7] mm: list_lru: deduplicate lock_list_lru()
* [PATCH v2 5/7] mm: list_lru: introduce caller locking for additions and deletions
* [PATCH v2 6/7] mm: list_lru: introduce memcg_list_lru_alloc_folio()
* [PATCH v2 7/7] mm: switch deferred split shrinker to list_lru

and found the following issues:
* WARNING in lock_list_lru_of_memcg
* possible deadlock in __folio_end_writeback

Full report is available here:
https://ci.syzbot.org/series/e7f4d9e2-b111-4e6e-80f8-e762d8337560

***

WARNING in lock_list_lru_of_memcg

tree: mm-new
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base: f543926f9d0c3f6dfb354adfe7fbaeedd1277c6b
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/7315345d-816f-4df6-a17e-355964ef03ca/config
C repro: https://ci.syzbot.org/findings/28d9d87d-fee2-4068-a072-c8a3713d5f60/c_repro
syz repro: https://ci.syzbot.org/findings/28d9d87d-fee2-4068-a072-c8a3713d5f60/syz_repro

XFS (loop0): Ending clean mount
XFS (loop0): Quotacheck needed: Please wait.
XFS (loop0): Quotacheck: Done.
------------[ cut here ]------------
!css_is_dying(&memcg->css)
WARNING: mm/list_lru.c:110 at lock_list_lru_of_memcg+0x33d/0x470 mm/list_lru.c:110, CPU#0: syz.0.17/5950
Modules linked in:
CPU: 0 UID: 0 PID: 5950 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_list_lru_of_memcg+0x33d/0x470 mm/list_lru.c:110
Code: 3c 28 00 74 08 4c 89 e7 e8 b0 02 1d 00 4d 8b 24 24 48 8b 54 24 20 4d 85 e4 0f 85 00 fe ff ff e9 75 fe ff ff e8 d4 df b3 ff 90 <0f> 0b 90 eb c1 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 06 fe ff ff 48
RSP: 0018:ffffc90004017110 EFLAGS: 00010093
RAX: ffffffff8211b3ac RBX: 0000000000000000 RCX: ffff888104f057c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888104f057c0 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000000 R12: ffff8881026d0d00
R13: dffffc0000000000 R14: ffffffff9a2de05c R15: 0000000000000002
FS: 0000555572bfe500(0000) GS:ffff88818de66000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000112554000 CR4: 00000000000006f0
Call Trace:
<TASK>
__folio_freeze_and_split_unmapped+0x2ab/0x34b0 mm/huge_memory.c:3767
__folio_split+0xae1/0x1570 mm/huge_memory.c:4033
try_folio_split_to_order include/linux/huge_mm.h:411 [inline]
try_folio_split_or_unmap+0x5b/0x1e0 mm/truncate.c:189
truncate_inode_partial_folio+0x4ab/0x8e0 mm/truncate.c:255
truncate_inode_pages_range+0x5f1/0xe30 mm/truncate.c:416
iomap_write_failed fs/iomap/buffered-io.c:780 [inline]
iomap_write_iter fs/iomap/buffered-io.c:1182 [inline]
iomap_file_buffered_write+0x788/0xb30 fs/iomap/buffered-io.c:1220
xfs_file_buffered_write+0x212/0x8c0 fs/xfs/xfs_file.c:1013
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61d/0xb90 fs/read_write.c:688
ksys_pwrite64 fs/read_write.c:795 [inline]
__do_sys_pwrite64 fs/read_write.c:803 [inline]
__se_sys_pwrite64 fs/read_write.c:800 [inline]
__x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81d019c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee035cc08 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f81d0415fa0 RCX: 00007f81d019c799
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007f81d0232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81d0415fac R14: 00007f81d0415fa0 R15: 00007f81d0415fa0
</TASK>


***

possible deadlock in __folio_end_writeback

tree: mm-new
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base: f543926f9d0c3f6dfb354adfe7fbaeedd1277c6b
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/7315345d-816f-4df6-a17e-355964ef03ca/config
C repro: https://ci.syzbot.org/findings/8c08a79f-a08c-41d5-95e6-2860caf8744c/c_repro
syz repro: https://ci.syzbot.org/findings/8c08a79f-a08c-41d5-95e6-2860caf8744c/syz_repro

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.0.17/5949 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88810c90c240 (&l->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
ffff88810c90c240 (&l->lock){+.+.}-{3:3}, at: lock_list_lru mm/list_lru.c:26 [inline]
ffff88810c90c240 (&l->lock){+.+.}-{3:3}, at: lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95

and this task is already holding:
ffff8881107ad160 (&xa->xa_lock#9){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
ffff8881107ad160 (&xa->xa_lock#9){..-.}-{3:3}, at: __folio_split+0xa2e/0x1570 mm/huge_memory.c:4025
which would create a new lock dependency:
(&xa->xa_lock#9){..-.}-{3:3} -> (&l->lock){+.+.}-{3:3}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&xa->xa_lock#9){..-.}-{3:3}

... which became SOFTIRQ-irq-safe at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
__folio_end_writeback+0x157/0x770 mm/page-writeback.c:2946
folio_end_writeback_no_dropbehind+0x151/0x290 mm/filemap.c:1667
folio_end_writeback+0xea/0x220 mm/filemap.c:1693
end_bio_bh_io_sync+0xbd/0x120 fs/buffer.c:2773
blk_update_request+0x57e/0xe60 block/blk-mq.c:1016
scsi_end_request+0x7c/0x820 drivers/scsi/scsi_lib.c:647
scsi_io_completion+0x131/0x360 drivers/scsi/scsi_lib.c:1088
blk_complete_reqs block/blk-mq.c:1253 [inline]
blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0xa3/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
ata_scsi_queuecmd+0x47b/0x590 drivers/ata/libata-scsi.c:4523
scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1647 [inline]
scsi_queue_rq+0x1835/0x3330 drivers/scsi/scsi_lib.c:1904
blk_mq_dispatch_rq_list+0xa70/0x1910 block/blk-mq.c:2148
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdcc/0x1600 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_work_fn+0x22e/0x300 block/blk-mq.c:2562
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

to a SOFTIRQ-irq-unsafe lock:
(&l->lock){+.+.}-{3:3}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
list_lru_lock mm/list_lru.c:154 [inline]
list_lru_add+0x46/0x260 mm/list_lru.c:208
list_lru_add_obj+0x191/0x270 mm/list_lru.c:221
d_lru_add+0xd6/0x160 fs/dcache.c:497
retain_dentry fs/dcache.c:779 [inline]
fast_dput+0x303/0x430 fs/dcache.c:866
dput+0xe8/0x1a0 fs/dcache.c:924
path_put fs/namei.c:717 [inline]
put_link+0x112/0x190 fs/namei.c:1196
walk_component fs/namei.c:2284 [inline]
link_path_walk+0x1299/0x18d0 fs/namei.c:2644
path_openat+0x2c3/0x3860 fs/namei.c:4826
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_open_execat+0x12b/0x580 fs/exec.c:781
open_exec+0x29/0x40 fs/exec.c:817
load_elf_binary+0x1aaf/0x2980 fs/binfmt_elf.c:908
search_binary_handler fs/exec.c:1664 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x93d/0x1460 fs/exec.c:1748
kernel_execve+0x844/0x930 fs/exec.c:1892
try_to_run_init_process+0x13/0x60 init/main.c:1512
kernel_init+0xad/0x1d0 init/main.c:1640
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&l->lock);
local_irq_disable();
lock(&xa->xa_lock#9);
lock(&l->lock);
<Interrupt>
lock(&xa->xa_lock#9);

*** DEADLOCK ***

5 locks held by syz.0.17/5949:
#0: ffff88816931a980 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:592 [inline]
#0: ffff88816931a980 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x152/0x2e0 mm/madvise.c:1779
#1: ffff8881107ad338 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: i_mmap_lock_read include/linux/fs.h:532 [inline]
#1: ffff8881107ad338 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: __folio_split+0x11d7/0x1570 mm/huge_memory.c:3993
#2: ffff8881107ad160 (&xa->xa_lock#9){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
#2: ffff8881107ad160 (&xa->xa_lock#9){..-.}-{3:3}, at: __folio_split+0xa2e/0x1570 mm/huge_memory.c:4025
#3: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#3: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#3: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: __folio_freeze_and_split_unmapped+0x1d3/0x34b0 mm/huge_memory.c:3766
#4: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#4: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#4: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: lock_list_lru_of_memcg+0x34/0x470 mm/list_lru.c:91

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&xa->xa_lock#9){..-.}-{3:3} {
IN-SOFTIRQ-W at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
__folio_end_writeback+0x157/0x770 mm/page-writeback.c:2946
folio_end_writeback_no_dropbehind+0x151/0x290 mm/filemap.c:1667
folio_end_writeback+0xea/0x220 mm/filemap.c:1693
end_bio_bh_io_sync+0xbd/0x120 fs/buffer.c:2773
blk_update_request+0x57e/0xe60 block/blk-mq.c:1016
scsi_end_request+0x7c/0x820 drivers/scsi/scsi_lib.c:647
scsi_io_completion+0x131/0x360 drivers/scsi/scsi_lib.c:1088
blk_complete_reqs block/blk-mq.c:1253 [inline]
blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0xa3/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
ata_scsi_queuecmd+0x47b/0x590 drivers/ata/libata-scsi.c:4523
scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1647 [inline]
scsi_queue_rq+0x1835/0x3330 drivers/scsi/scsi_lib.c:1904
blk_mq_dispatch_rq_list+0xa70/0x1910 block/blk-mq.c:2148
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdcc/0x1600 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_work_fn+0x22e/0x300 block/blk-mq.c:2562
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:371 [inline]
shmem_add_to_page_cache+0x7b2/0xd40 mm/shmem.c:904
shmem_alloc_and_add_folio+0x869/0xf80 mm/shmem.c:1998
shmem_get_folio_gfp+0x4d4/0x1420 mm/shmem.c:2549
shmem_read_folio_gfp+0x8a/0xe0 mm/shmem.c:5957
drm_gem_get_pages+0x263/0x9d0 drivers/gpu/drm/drm_gem.c:696
drm_gem_shmem_get_pages_locked+0x22b/0x480 drivers/gpu/drm/drm_gem_shmem_helper.c:222
drm_gem_shmem_pin_locked+0x251/0x4d0 drivers/gpu/drm/drm_gem_shmem_helper.c:283
drm_gem_shmem_vmap_locked+0x499/0x7d0 drivers/gpu/drm/drm_gem_shmem_helper.c:387
drm_gem_vmap_locked drivers/gpu/drm/drm_gem.c:1387 [inline]
drm_gem_vmap+0x10a/0x1d0 drivers/gpu/drm/drm_gem.c:1429
drm_client_buffer_vmap+0x6c/0xb0 drivers/gpu/drm/drm_client.c:355
drm_fbdev_shmem_driver_fbdev_probe+0x273/0x8a0 drivers/gpu/drm/drm_fbdev_shmem.c:159
drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1468 [inline]
__drm_fb_helper_initial_config_and_unlock+0x1421/0x1b90 drivers/gpu/drm/drm_fb_helper.c:1647
drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66
drm_client_register+0x172/0x210 drivers/gpu/drm/drm_client.c:143
drm_fbdev_client_setup+0x1a0/0x3f0 drivers/gpu/drm/clients/drm_fbdev_client.c:168
drm_client_setup+0x107/0x220 drivers/gpu/drm/clients/drm_client_setup.c:46
vkms_create+0x413/0x4d0 drivers/gpu/drm/vkms/vkms_drv.c:212
vkms_init+0x57/0x80 drivers/gpu/drm/vkms/vkms_drv.c:240
do_one_initcall+0x250/0x8d0 init/main.c:1384
do_initcall_level+0x104/0x190 init/main.c:1446
do_initcalls+0x59/0xa0 init/main.c:1462
kernel_init_freeable+0x2a6/0x3e0 init/main.c:1694
kernel_init+0x1d/0x1d0 init/main.c:1584
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff9a2e8be0>] xa_init_flags.__key+0x0/0x20

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&l->lock){+.+.}-{3:3} {
HARDIRQ-ON-W at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
list_lru_lock mm/list_lru.c:154 [inline]
list_lru_add+0x46/0x260 mm/list_lru.c:208
list_lru_add_obj+0x191/0x270 mm/list_lru.c:221
d_lru_add+0xd6/0x160 fs/dcache.c:497
retain_dentry fs/dcache.c:779 [inline]
fast_dput+0x303/0x430 fs/dcache.c:866
dput+0xe8/0x1a0 fs/dcache.c:924
path_put fs/namei.c:717 [inline]
put_link+0x112/0x190 fs/namei.c:1196
walk_component fs/namei.c:2284 [inline]
link_path_walk+0x1299/0x18d0 fs/namei.c:2644
path_openat+0x2c3/0x3860 fs/namei.c:4826
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_open_execat+0x12b/0x580 fs/exec.c:781
open_exec+0x29/0x40 fs/exec.c:817
load_elf_binary+0x1aaf/0x2980 fs/binfmt_elf.c:908
search_binary_handler fs/exec.c:1664 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x93d/0x1460 fs/exec.c:1748
kernel_execve+0x844/0x930 fs/exec.c:1892
try_to_run_init_process+0x13/0x60 init/main.c:1512
kernel_init+0xad/0x1d0 init/main.c:1640
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
SOFTIRQ-ON-W at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
list_lru_lock mm/list_lru.c:154 [inline]
list_lru_add+0x46/0x260 mm/list_lru.c:208
list_lru_add_obj+0x191/0x270 mm/list_lru.c:221
d_lru_add+0xd6/0x160 fs/dcache.c:497
retain_dentry fs/dcache.c:779 [inline]
fast_dput+0x303/0x430 fs/dcache.c:866
dput+0xe8/0x1a0 fs/dcache.c:924
path_put fs/namei.c:717 [inline]
put_link+0x112/0x190 fs/namei.c:1196
walk_component fs/namei.c:2284 [inline]
link_path_walk+0x1299/0x18d0 fs/namei.c:2644
path_openat+0x2c3/0x3860 fs/namei.c:4826
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_open_execat+0x12b/0x580 fs/exec.c:781
open_exec+0x29/0x40 fs/exec.c:817
load_elf_binary+0x1aaf/0x2980 fs/binfmt_elf.c:908
search_binary_handler fs/exec.c:1664 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x93d/0x1460 fs/exec.c:1748
kernel_execve+0x844/0x930 fs/exec.c:1892
try_to_run_init_process+0x13/0x60 init/main.c:1512
kernel_init+0xad/0x1d0 init/main.c:1640
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INITIAL USE at:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
list_lru_lock mm/list_lru.c:154 [inline]
list_lru_add+0x46/0x260 mm/list_lru.c:208
list_lru_add_obj+0x191/0x270 mm/list_lru.c:221
d_lru_add+0xd6/0x160 fs/dcache.c:497
retain_dentry fs/dcache.c:779 [inline]
fast_dput+0x303/0x430 fs/dcache.c:866
dput+0xe8/0x1a0 fs/dcache.c:924
path_put fs/namei.c:717 [inline]
put_link+0x112/0x190 fs/namei.c:1196
walk_component fs/namei.c:2284 [inline]
link_path_walk+0x1299/0x18d0 fs/namei.c:2644
path_openat+0x2c3/0x3860 fs/namei.c:4826
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_open_execat+0x12b/0x580 fs/exec.c:781
open_exec+0x29/0x40 fs/exec.c:817
load_elf_binary+0x1aaf/0x2980 fs/binfmt_elf.c:908
search_binary_handler fs/exec.c:1664 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x93d/0x1460 fs/exec.c:1748
kernel_execve+0x844/0x930 fs/exec.c:1892
try_to_run_init_process+0x13/0x60 init/main.c:1512
kernel_init+0xad/0x1d0 init/main.c:1640
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff9a2c9540>] init_one_lru.__key+0x0/0x20
... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
__folio_freeze_and_split_unmapped+0x2ab/0x34b0 mm/huge_memory.c:3767
__folio_split+0xae1/0x1570 mm/huge_memory.c:4033
shmem_writeout+0x570/0x1700 mm/shmem.c:1630
writeout mm/vmscan.c:631 [inline]
pageout mm/vmscan.c:680 [inline]
shrink_folio_list+0x3380/0x5240 mm/vmscan.c:1401
reclaim_folio_list+0x100/0x460 mm/vmscan.c:2172
reclaim_pages+0x45b/0x530 mm/vmscan.c:2209
madvise_cold_or_pageout_pte_range+0x1f7e/0x2220 mm/madvise.c:442
walk_pmd_range mm/pagewalk.c:129 [inline]
walk_pud_range mm/pagewalk.c:223 [inline]
walk_p4d_range mm/pagewalk.c:261 [inline]
walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:302
__walk_page_range+0x14c/0x710 mm/pagewalk.c:410
walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:714
madvise_pageout_page_range mm/madvise.c:620 [inline]
madvise_pageout mm/madvise.c:645 [inline]
madvise_vma_behavior+0x2883/0x44d0 mm/madvise.c:1356
madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1711
madvise_do_behavior+0x386/0x540 mm/madvise.c:1927
do_madvise+0x1fa/0x2e0 mm/madvise.c:2020
__do_sys_madvise mm/madvise.c:2029 [inline]
__se_sys_madvise mm/madvise.c:2027 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2027
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 0 UID: 0 PID: 5949 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
check_irq_usage kernel/locking/lockdep.c:2857 [inline]
check_prev_add kernel/locking/lockdep.c:3169 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x2a94/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:341 [inline]
lock_list_lru mm/list_lru.c:26 [inline]
lock_list_lru_of_memcg+0x268/0x470 mm/list_lru.c:95
__folio_freeze_and_split_unmapped+0x2ab/0x34b0 mm/huge_memory.c:3767
__folio_split+0xae1/0x1570 mm/huge_memory.c:4033
shmem_writeout+0x570/0x1700 mm/shmem.c:1630
writeout mm/vmscan.c:631 [inline]
pageout mm/vmscan.c:680 [inline]
shrink_folio_list+0x3380/0x5240 mm/vmscan.c:1401
reclaim_folio_list+0x100/0x460 mm/vmscan.c:2172
reclaim_pages+0x45b/0x530 mm/vmscan.c:2209
madvise_cold_or_pageout_pte_range+0x1f7e/0x2220 mm/madvise.c:442
walk_pmd_range mm/pagewalk.c:129 [inline]
walk_pud_range mm/pagewalk.c:223 [inline]
walk_p4d_range mm/pagewalk.c:261 [inline]
walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:302
__walk_page_range+0x14c/0x710 mm/pagewalk.c:410
walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:714
madvise_pageout_page_range mm/madvise.c:620 [inline]
madvise_pageout mm/madvise.c:645 [inline]
madvise_vma_behavior+0x2883/0x44d0 mm/madvise.c:1356
madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1711
madvise_do_behavior+0x386/0x540 mm/madvise.c:1927
do_madvise+0x1fa/0x2e0 mm/madvise.c:2020
__do_sys_madvise mm/madvise.c:2029 [inline]
__se_sys_madvise mm/madvise.c:2027 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2027
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b7939c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffefe994ff8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8b79615fa0 RCX: 00007f8b7939c799
RDX: 0000000000000015 RSI: 0000000000c00000 RDI: 0000200000000000
RBP: 00007f8b79432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b79615fac R14: 00007f8b79615fa0 R15: 00007f8b79615fa0
</TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
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