[moderation] [fs?] [mm?] possible deadlock in flush_end_io
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syzbot
3:21 AM (13 hours ago) 3:21 AM
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b98c94eed4a9 arm64: mte: Do not warn if the page is alread..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=10ebbb04580000
kernel config: https://syzkaller.appspot.com/x/.config?x=158bd6857eb7a550
dashboard link: https://syzkaller.appspot.com/bug?extid=584c3bde95450560758e
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linux-...@vger.kernel.org linu...@kvack.org wi...@infradead.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2c82e514449b/disk-b98c94ee.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a322ed38c368/vmlinux-b98c94ee.xz
kernel image: https://storage.googleapis.com/syzbot-assets/059db7d7114e/Image-b98c94ee.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+584c3b...@syzkaller.appspotmail.com
=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.4.56/6842 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff800097391d90 (&p->sequence){+.-.}-{0:0}, at: __fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
and this task is already holding:
ffff0000f79a8940 (&xa->xa_lock#10){..-.}-{3:3}, at: __folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
which would create a new lock dependency:
(&xa->xa_lock#10){..-.}-{3:3} -> (&p->sequence){+.-.}-{0:0}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&fq->mq_flush_lock){-.-.}-{3:3}
... which became HARDIRQ-irq-safe at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
nvme_end_req drivers/nvme/host/core.c:454 [inline]
nvme_complete_rq+0x150/0x464 drivers/nvme/host/core.c:-1
nvme_pci_complete_rq drivers/nvme/host/pci.c:1265 [inline]
nvme_handle_cqe drivers/nvme/host/pci.c:1329 [inline]
nvme_poll_cq+0x65c/0x1018 drivers/nvme/host/pci.c:1356
nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1370
__handle_irq_event_percpu+0x224/0x8e4 kernel/irq/handle.c:203
handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:257
handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq_desc kernel/irq/irqdesc.c:669 [inline]
generic_handle_domain_irq+0xe0/0x140 kernel/irq/irqdesc.c:725
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:874 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:925 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:969
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:157
__el1_irq arch/arm64/kernel/entry-common.c:519 [inline]
el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
raw_spin_rq_unlock_irq kernel/sched/sched.h:1558 [inline]
finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:5073
finish_task_switch+0x120/0x5a4 kernel/sched/core.c:5191
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x13b4/0x2864 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xb4/0x230 kernel/sched/core.c:7026
schedule_timeout+0xac/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common+0x288/0x3f8 kernel/sched/completion.c:100
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion_state+0x48/0x70 kernel/sched/completion.c:269
wait_for_vfork_done kernel/fork.c:1392 [inline]
kernel_clone+0x490/0x84c kernel/fork.c:2647
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2718 [inline]
__arm64_sys_clone+0x144/0x1a0 kernel/fork.c:2718
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
to a HARDIRQ-irq-unsafe lock:
(&p->sequence){+.-.}-{0:0}
... which became HARDIRQ-irq-unsafe at:
...
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
other info that might help us debug this:
Chain exists of:
&fq->mq_flush_lock --> &xa->xa_lock#10 --> &p->sequence
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->sequence);
local_irq_disable();
lock(&fq->mq_flush_lock);
lock(&xa->xa_lock#10);
<Interrupt>
lock(&fq->mq_flush_lock);
*** DEADLOCK ***
5 locks held by syz.4.56/6842:
#0: ffff0000dbe58638 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x1fc/0x2a0 fs/file.c:1232
#1: ffff0000d432e420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline]
#1: ffff0000d432e420 (sb_writers#12){.+.+}-{0:0}, at: vfs_writev+0x21c/0x7cc fs/read_write.c:1055
#2: ffff0000f79a8848 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline]
#2: ffff0000f79a8848 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: fuse_fsync+0xf0/0x2b8 fs/fuse/file.c:528
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: fuse_writepages_send fs/fuse/file.c:2089 [inline]
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: fuse_iomap_writeback_range+0x3b8/0x152c fs/fuse/file.c:2150
#4: ffff0000f79a8940 (&xa->xa_lock#10){..-.}-{3:3}, at: __folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&fq->mq_flush_lock){-.-.}-{3:3} {
IN-HARDIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
nvme_end_req drivers/nvme/host/core.c:454 [inline]
nvme_complete_rq+0x150/0x464 drivers/nvme/host/core.c:-1
nvme_pci_complete_rq drivers/nvme/host/pci.c:1265 [inline]
nvme_handle_cqe drivers/nvme/host/pci.c:1329 [inline]
nvme_poll_cq+0x65c/0x1018 drivers/nvme/host/pci.c:1356
nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1370
__handle_irq_event_percpu+0x224/0x8e4 kernel/irq/handle.c:203
handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:257
handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq_desc kernel/irq/irqdesc.c:669 [inline]
generic_handle_domain_irq+0xe0/0x140 kernel/irq/irqdesc.c:725
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:874 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:925 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:969
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:157
__el1_irq arch/arm64/kernel/entry-common.c:519 [inline]
el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
raw_spin_rq_unlock_irq kernel/sched/sched.h:1558 [inline]
finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:5073
finish_task_switch+0x120/0x5a4 kernel/sched/core.c:5191
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x13b4/0x2864 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xb4/0x230 kernel/sched/core.c:7026
schedule_timeout+0xac/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common+0x288/0x3f8 kernel/sched/completion.c:100
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion_state+0x48/0x70 kernel/sched/completion.c:269
wait_for_vfork_done kernel/fork.c:1392 [inline]
kernel_clone+0x490/0x84c kernel/fork.c:2647
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2718 [inline]
__arm64_sys_clone+0x144/0x1a0 kernel/fork.c:2718
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
blk_insert_flush+0x360/0x4b8 block/blk-flush.c:454
blk_mq_submit_bio+0x1614/0x2168 block/blk-mq.c:3218
__submit_bio+0x1d8/0x4d8 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x29c/0x9a4 block/blk-core.c:755
submit_bio_noacct+0xde0/0x186c block/blk-core.c:879
submit_bio+0x3b4/0x550 block/blk-core.c:921
submit_bio_wait+0x104/0x208 block/bio.c:1388
blkdev_issue_flush+0xb4/0x100 block/blk-flush.c:473
ext4_init_inode_table+0x420/0x780 fs/ext4/ialloc.c:1603
ext4_run_li_request fs/ext4/super.c:3729 [inline]
ext4_lazyinit_thread+0x704/0x1744 fs/ext4/super.c:3824
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff800097534120>] blk_alloc_flush_queue.__key+0x0/0x20
-> (&xa->xa_lock#10){..-.}-{3:3} {
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
__folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
end_buffer_async_write+0x20c/0x350 fs/buffer.c:419
end_bio_bh_io_sync+0xb0/0x184 fs/buffer.c:2776
bio_endio+0x858/0x894 block/bio.c:1672
blk_update_request+0x474/0xba8 block/blk-mq.c:998
blk_mq_end_request+0x54/0x88 block/blk-mq.c:1160
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
shmem_add_to_page_cache+0x564/0xa24 mm/shmem.c:887
shmem_alloc_and_add_folio+0x73c/0x10b0 mm/shmem.c:1936
shmem_get_folio_gfp+0x4d4/0x159c mm/shmem.c:2533
shmem_read_folio_gfp+0x8c/0xf0 mm/shmem.c:5931
drm_gem_get_pages+0x1cc/0x7c0 drivers/gpu/drm/drm_gem.c:656
drm_gem_shmem_get_pages_locked+0x1d4/0x364 drivers/gpu/drm/drm_gem_shmem_helper.c:200
drm_gem_shmem_pin_locked+0x1f8/0x410 drivers/gpu/drm/drm_gem_shmem_helper.c:261
drm_gem_shmem_vmap_locked+0x3cc/0x658 drivers/gpu/drm/drm_gem_shmem_helper.c:365
drm_gem_shmem_object_vmap+0x28/0x38 include/drm/drm_gem_shmem_helper.h:243
drm_gem_vmap_locked drivers/gpu/drm/drm_gem.c:1279 [inline]
drm_gem_vmap+0x104/0x1d8 drivers/gpu/drm/drm_gem.c:1321
drm_client_buffer_vmap+0x48/0x90 drivers/gpu/drm/drm_client.c:312
drm_fbdev_shmem_driver_fbdev_probe+0x1d8/0x70c drivers/gpu/drm/drm_fbdev_shmem.c:160
drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1650 [inline]
__drm_fb_helper_initial_config_and_unlock+0xf94/0x159c drivers/gpu/drm/drm_fb_helper.c:1830
drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1917
drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52
drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:141
drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:159
drm_client_setup+0x114/0x228 drivers/gpu/drm/clients/drm_client_setup.c:46
vkms_create drivers/gpu/drm/vkms/vkms_drv.c:201 [inline]
vkms_init+0x338/0x3f0 drivers/gpu/drm/vkms/vkms_drv.c:221
do_one_initcall+0x250/0x990 init/main.c:1283
do_initcall_level+0x128/0x1c4 init/main.c:1345
do_initcalls+0x70/0xd0 init/main.c:1361
do_basic_setup+0x78/0x8c init/main.c:1380
kernel_init_freeable+0x268/0x39c init/main.c:1593
kernel_init+0x24/0x1dc init/main.c:1483
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff8000973b6240>] xa_init_flags.__key+0x0/0x20
... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
__folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
f2fs_write_end_io+0x6b8/0xa70 fs/f2fs/data.c:362
bio_endio+0x858/0x894 block/bio.c:1672
blk_update_request+0x474/0xba8 block/blk-mq.c:998
blk_mq_end_request+0x54/0x88 block/blk-mq.c:1160
blk_flush_complete_seq+0x57c/0xad4 block/blk-flush.c:191
flush_end_io+0x9e8/0xd68 block/blk-flush.c:250
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (&p->sequence){+.-.}-{0:0} {
HARDIRQ-ON-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
INITIAL READ USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xac/0x270 lib/flex_proportions.c:155
__wb_calc_thresh+0xfc/0x3b0 mm/page-writeback.c:913
wb_bg_dirty_limits mm/page-writeback.c:2130 [inline]
domain_over_bg_thresh+0xb8/0x1f0 mm/page-writeback.c:2144
wb_over_bg_thresh+0xf8/0x17c mm/page-writeback.c:2165
wb_check_background_flush fs/fs-writeback.c:2257 [inline]
wb_do_writeback fs/fs-writeback.c:2355 [inline]
wb_workfn+0xa30/0xdc0 fs/fs-writeback.c:2382
process_one_work+0x7e8/0x155c kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x958/0xed8 kernel/workqueue.c:3427
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff800097904a80>] fprop_global_init.__key.1+0x0/0x20
... acquired at:
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xf0/0x270 lib/flex_proportions.c:155
__fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
wb_domain_writeout_add mm/page-writeback.c:562 [inline]
__wb_writeout_add+0xbc/0x27c mm/page-writeback.c:586
__folio_end_writeback+0x380/0x75c mm/page-writeback.c:3003
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
iomap_finish_folio_write+0x1c0/0x2a4 fs/iomap/buffered-io.c:1582
fuse_writepage_finish fs/fuse/file.c:1837 [inline]
fuse_send_writepage fs/fuse/file.c:1887 [inline]
fuse_flush_writepages+0x54c/0x73c fs/fuse/file.c:1912
fuse_writepages_send fs/fuse/file.c:2091 [inline]
fuse_iomap_writeback_range+0x48c/0x152c fs/fuse/file.c:2150
iomap_writeback_range fs/iomap/buffered-io.c:1593 [inline]
iomap_writeback_folio+0xee4/0x1c74 fs/iomap/buffered-io.c:1718
iomap_writepages+0x128/0x25c fs/iomap/buffered-io.c:1770
fuse_writepages+0x208/0x2bc fs/fuse/file.c:2220
do_writepages+0x270/0x468 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:797
fuse_fsync+0x100/0x2b8 fs/fuse/file.c:535
vfs_fsync_range+0x160/0x19c fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
fuse_cache_write_iter fs/fuse/file.c:1470 [inline]
fuse_file_write_iter+0xa20/0xb88 fs/fuse/file.c:1783
do_iter_readv_writev+0x4bc/0x720 fs/read_write.c:-1
vfs_writev+0x29c/0x7cc fs/read_write.c:1057
do_writev+0x128/0x290 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__arm64_sys_writev+0x80/0x94 fs/read_write.c:1168
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
stack backtrace:
CPU: 1 UID: 0 PID: 6842 Comm: syz.4.56 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
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+0x3058/0x30a4 kernel/locking/lockdep.c:5237
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xf0/0x270 lib/flex_proportions.c:155
__fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
wb_domain_writeout_add mm/page-writeback.c:562 [inline]
__wb_writeout_add+0xbc/0x27c mm/page-writeback.c:586
__folio_end_writeback+0x380/0x75c mm/page-writeback.c:3003
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
iomap_finish_folio_write+0x1c0/0x2a4 fs/iomap/buffered-io.c:1582
fuse_writepage_finish fs/fuse/file.c:1837 [inline]
fuse_send_writepage fs/fuse/file.c:1887 [inline]
fuse_flush_writepages+0x54c/0x73c fs/fuse/file.c:1912
fuse_writepages_send fs/fuse/file.c:2091 [inline]
fuse_iomap_writeback_range+0x48c/0x152c fs/fuse/file.c:2150
iomap_writeback_range fs/iomap/buffered-io.c:1593 [inline]
iomap_writeback_folio+0xee4/0x1c74 fs/iomap/buffered-io.c:1718
iomap_writepages+0x128/0x25c fs/iomap/buffered-io.c:1770
fuse_writepages+0x208/0x2bc fs/fuse/file.c:2220
do_writepages+0x270/0x468 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:797
fuse_fsync+0x100/0x2b8 fs/fuse/file.c:535
vfs_fsync_range+0x160/0x19c fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
fuse_cache_write_iter fs/fuse/file.c:1470 [inline]
fuse_file_write_iter+0xa20/0xb88 fs/fuse/file.c:1783
do_iter_readv_writev+0x4bc/0x720 fs/read_write.c:-1
vfs_writev+0x29c/0x7cc fs/read_write.c:1057
do_writev+0x128/0x290 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__arm64_sys_writev+0x80/0x94 fs/read_write.c:1168
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: b98c94eed4a9 arm64: mte: Do not warn if the page is alread..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=10ebbb04580000
kernel config: https://syzkaller.appspot.com/x/.config?x=158bd6857eb7a550
dashboard link: https://syzkaller.appspot.com/bug?extid=584c3bde95450560758e
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linux-...@vger.kernel.org linu...@kvack.org wi...@infradead.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2c82e514449b/disk-b98c94ee.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a322ed38c368/vmlinux-b98c94ee.xz
kernel image: https://storage.googleapis.com/syzbot-assets/059db7d7114e/Image-b98c94ee.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+584c3b...@syzkaller.appspotmail.com
=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.4.56/6842 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff800097391d90 (&p->sequence){+.-.}-{0:0}, at: __fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
and this task is already holding:
ffff0000f79a8940 (&xa->xa_lock#10){..-.}-{3:3}, at: __folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
which would create a new lock dependency:
(&xa->xa_lock#10){..-.}-{3:3} -> (&p->sequence){+.-.}-{0:0}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&fq->mq_flush_lock){-.-.}-{3:3}
... which became HARDIRQ-irq-safe at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
nvme_end_req drivers/nvme/host/core.c:454 [inline]
nvme_complete_rq+0x150/0x464 drivers/nvme/host/core.c:-1
nvme_pci_complete_rq drivers/nvme/host/pci.c:1265 [inline]
nvme_handle_cqe drivers/nvme/host/pci.c:1329 [inline]
nvme_poll_cq+0x65c/0x1018 drivers/nvme/host/pci.c:1356
nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1370
__handle_irq_event_percpu+0x224/0x8e4 kernel/irq/handle.c:203
handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:257
handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq_desc kernel/irq/irqdesc.c:669 [inline]
generic_handle_domain_irq+0xe0/0x140 kernel/irq/irqdesc.c:725
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:874 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:925 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:969
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:157
__el1_irq arch/arm64/kernel/entry-common.c:519 [inline]
el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
raw_spin_rq_unlock_irq kernel/sched/sched.h:1558 [inline]
finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:5073
finish_task_switch+0x120/0x5a4 kernel/sched/core.c:5191
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x13b4/0x2864 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xb4/0x230 kernel/sched/core.c:7026
schedule_timeout+0xac/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common+0x288/0x3f8 kernel/sched/completion.c:100
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion_state+0x48/0x70 kernel/sched/completion.c:269
wait_for_vfork_done kernel/fork.c:1392 [inline]
kernel_clone+0x490/0x84c kernel/fork.c:2647
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2718 [inline]
__arm64_sys_clone+0x144/0x1a0 kernel/fork.c:2718
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
to a HARDIRQ-irq-unsafe lock:
(&p->sequence){+.-.}-{0:0}
... which became HARDIRQ-irq-unsafe at:
...
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
other info that might help us debug this:
Chain exists of:
&fq->mq_flush_lock --> &xa->xa_lock#10 --> &p->sequence
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->sequence);
local_irq_disable();
lock(&fq->mq_flush_lock);
lock(&xa->xa_lock#10);
<Interrupt>
lock(&fq->mq_flush_lock);
*** DEADLOCK ***
5 locks held by syz.4.56/6842:
#0: ffff0000dbe58638 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x1fc/0x2a0 fs/file.c:1232
#1: ffff0000d432e420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline]
#1: ffff0000d432e420 (sb_writers#12){.+.+}-{0:0}, at: vfs_writev+0x21c/0x7cc fs/read_write.c:1055
#2: ffff0000f79a8848 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline]
#2: ffff0000f79a8848 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: fuse_fsync+0xf0/0x2b8 fs/fuse/file.c:528
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: fuse_writepages_send fs/fuse/file.c:2089 [inline]
#3: ffff0000f79a8d38 (&fi->lock){+.+.}-{3:3}, at: fuse_iomap_writeback_range+0x3b8/0x152c fs/fuse/file.c:2150
#4: ffff0000f79a8940 (&xa->xa_lock#10){..-.}-{3:3}, at: __folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&fq->mq_flush_lock){-.-.}-{3:3} {
IN-HARDIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
nvme_end_req drivers/nvme/host/core.c:454 [inline]
nvme_complete_rq+0x150/0x464 drivers/nvme/host/core.c:-1
nvme_pci_complete_rq drivers/nvme/host/pci.c:1265 [inline]
nvme_handle_cqe drivers/nvme/host/pci.c:1329 [inline]
nvme_poll_cq+0x65c/0x1018 drivers/nvme/host/pci.c:1356
nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1370
__handle_irq_event_percpu+0x224/0x8e4 kernel/irq/handle.c:203
handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:257
handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq_desc kernel/irq/irqdesc.c:669 [inline]
generic_handle_domain_irq+0xe0/0x140 kernel/irq/irqdesc.c:725
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:874 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:925 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:969
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:157
__el1_irq arch/arm64/kernel/entry-common.c:519 [inline]
el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
raw_spin_rq_unlock_irq kernel/sched/sched.h:1558 [inline]
finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:5073
finish_task_switch+0x120/0x5a4 kernel/sched/core.c:5191
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x13b4/0x2864 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xb4/0x230 kernel/sched/core.c:7026
schedule_timeout+0xac/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common+0x288/0x3f8 kernel/sched/completion.c:100
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion_state+0x48/0x70 kernel/sched/completion.c:269
wait_for_vfork_done kernel/fork.c:1392 [inline]
kernel_clone+0x490/0x84c kernel/fork.c:2647
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2718 [inline]
__arm64_sys_clone+0x144/0x1a0 kernel/fork.c:2718
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
flush_end_io+0xb4/0xd68 block/blk-flush.c:211
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
blk_insert_flush+0x360/0x4b8 block/blk-flush.c:454
blk_mq_submit_bio+0x1614/0x2168 block/blk-mq.c:3218
__submit_bio+0x1d8/0x4d8 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x29c/0x9a4 block/blk-core.c:755
submit_bio_noacct+0xde0/0x186c block/blk-core.c:879
submit_bio+0x3b4/0x550 block/blk-core.c:921
submit_bio_wait+0x104/0x208 block/bio.c:1388
blkdev_issue_flush+0xb4/0x100 block/blk-flush.c:473
ext4_init_inode_table+0x420/0x780 fs/ext4/ialloc.c:1603
ext4_run_li_request fs/ext4/super.c:3729 [inline]
ext4_lazyinit_thread+0x704/0x1744 fs/ext4/super.c:3824
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff800097534120>] blk_alloc_flush_queue.__key+0x0/0x20
-> (&xa->xa_lock#10){..-.}-{3:3} {
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
__folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
end_buffer_async_write+0x20c/0x350 fs/buffer.c:419
end_bio_bh_io_sync+0xb0/0x184 fs/buffer.c:2776
bio_endio+0x858/0x894 block/bio.c:1672
blk_update_request+0x474/0xba8 block/blk-mq.c:998
blk_mq_end_request+0x54/0x88 block/blk-mq.c:1160
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
shmem_add_to_page_cache+0x564/0xa24 mm/shmem.c:887
shmem_alloc_and_add_folio+0x73c/0x10b0 mm/shmem.c:1936
shmem_get_folio_gfp+0x4d4/0x159c mm/shmem.c:2533
shmem_read_folio_gfp+0x8c/0xf0 mm/shmem.c:5931
drm_gem_get_pages+0x1cc/0x7c0 drivers/gpu/drm/drm_gem.c:656
drm_gem_shmem_get_pages_locked+0x1d4/0x364 drivers/gpu/drm/drm_gem_shmem_helper.c:200
drm_gem_shmem_pin_locked+0x1f8/0x410 drivers/gpu/drm/drm_gem_shmem_helper.c:261
drm_gem_shmem_vmap_locked+0x3cc/0x658 drivers/gpu/drm/drm_gem_shmem_helper.c:365
drm_gem_shmem_object_vmap+0x28/0x38 include/drm/drm_gem_shmem_helper.h:243
drm_gem_vmap_locked drivers/gpu/drm/drm_gem.c:1279 [inline]
drm_gem_vmap+0x104/0x1d8 drivers/gpu/drm/drm_gem.c:1321
drm_client_buffer_vmap+0x48/0x90 drivers/gpu/drm/drm_client.c:312
drm_fbdev_shmem_driver_fbdev_probe+0x1d8/0x70c drivers/gpu/drm/drm_fbdev_shmem.c:160
drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1650 [inline]
__drm_fb_helper_initial_config_and_unlock+0xf94/0x159c drivers/gpu/drm/drm_fb_helper.c:1830
drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1917
drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52
drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:141
drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:159
drm_client_setup+0x114/0x228 drivers/gpu/drm/clients/drm_client_setup.c:46
vkms_create drivers/gpu/drm/vkms/vkms_drv.c:201 [inline]
vkms_init+0x338/0x3f0 drivers/gpu/drm/vkms/vkms_drv.c:221
do_one_initcall+0x250/0x990 init/main.c:1283
do_initcall_level+0x128/0x1c4 init/main.c:1345
do_initcalls+0x70/0xd0 init/main.c:1361
do_basic_setup+0x78/0x8c init/main.c:1380
kernel_init_freeable+0x268/0x39c init/main.c:1593
kernel_init+0x24/0x1dc init/main.c:1483
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff8000973b6240>] xa_init_flags.__key+0x0/0x20
... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
__folio_end_writeback+0x10c/0x75c mm/page-writeback.c:2996
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
f2fs_write_end_io+0x6b8/0xa70 fs/f2fs/data.c:362
bio_endio+0x858/0x894 block/bio.c:1672
blk_update_request+0x474/0xba8 block/blk-mq.c:998
blk_mq_end_request+0x54/0x88 block/blk-mq.c:1160
blk_flush_complete_seq+0x57c/0xad4 block/blk-flush.c:191
flush_end_io+0x9e8/0xd68 block/blk-flush.c:250
__blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1150
blk_mq_end_request+0x68/0x88 block/blk-mq.c:1162
lo_complete_rq+0x124/0x274 drivers/block/loop.c:314
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x11c/0x168 block/blk-mq.c:1240
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063
smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (&p->sequence){+.-.}-{0:0} {
HARDIRQ-ON-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
IN-SOFTIRQ-W at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
INITIAL USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
fprop_new_period+0x3b8/0x718 lib/flex_proportions.c:74
writeout_period+0x94/0x11c mm/page-writeback.c:615
call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x51c/0x76c kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2404
handle_softirqs+0x328/0xc88 kernel/softirq.c:622
__do_softirq+0x14/0x20 kernel/softirq.c:656
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68
call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73
invoke_softirq kernel/softirq.c:503 [inline]
__irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723
irq_exit_rcu+0x14/0x84 kernel/softirq.c:739
__el1_irq arch/arm64/kernel/entry-common.c:520 [inline]
el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:532
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:537
el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592
__sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235
idr_get_next_ul lib/idr.c:236 [inline]
idr_get_next+0x158/0x2e4 lib/idr.c:267
genl_release+0x164/0x1d4 net/netlink/genetlink.c:704
netlink_release+0xc48/0x1810 net/netlink/af_netlink.c:736
__sock_release net/socket.c:662 [inline]
sock_close+0xa0/0x1e4 net/socket.c:1455
__fput+0x340/0x75c fs/file_table.c:468
fput_close_sync+0x100/0x224 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__arm64_sys_close+0x7c/0x118 fs/open.c:1574
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
INITIAL READ USE at:
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xac/0x270 lib/flex_proportions.c:155
__wb_calc_thresh+0xfc/0x3b0 mm/page-writeback.c:913
wb_bg_dirty_limits mm/page-writeback.c:2130 [inline]
domain_over_bg_thresh+0xb8/0x1f0 mm/page-writeback.c:2144
wb_over_bg_thresh+0xf8/0x17c mm/page-writeback.c:2165
wb_check_background_flush fs/fs-writeback.c:2257 [inline]
wb_do_writeback fs/fs-writeback.c:2355 [inline]
wb_workfn+0xa30/0xdc0 fs/fs-writeback.c:2382
process_one_work+0x7e8/0x155c kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x958/0xed8 kernel/workqueue.c:3427
kthread+0x5fc/0x75c kernel/kthread.c:463
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
}
... key at: [<ffff800097904a80>] fprop_global_init.__key.1+0x0/0x20
... acquired at:
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xf0/0x270 lib/flex_proportions.c:155
__fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
wb_domain_writeout_add mm/page-writeback.c:562 [inline]
__wb_writeout_add+0xbc/0x27c mm/page-writeback.c:586
__folio_end_writeback+0x380/0x75c mm/page-writeback.c:3003
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
iomap_finish_folio_write+0x1c0/0x2a4 fs/iomap/buffered-io.c:1582
fuse_writepage_finish fs/fuse/file.c:1837 [inline]
fuse_send_writepage fs/fuse/file.c:1887 [inline]
fuse_flush_writepages+0x54c/0x73c fs/fuse/file.c:1912
fuse_writepages_send fs/fuse/file.c:2091 [inline]
fuse_iomap_writeback_range+0x48c/0x152c fs/fuse/file.c:2150
iomap_writeback_range fs/iomap/buffered-io.c:1593 [inline]
iomap_writeback_folio+0xee4/0x1c74 fs/iomap/buffered-io.c:1718
iomap_writepages+0x128/0x25c fs/iomap/buffered-io.c:1770
fuse_writepages+0x208/0x2bc fs/fuse/file.c:2220
do_writepages+0x270/0x468 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:797
fuse_fsync+0x100/0x2b8 fs/fuse/file.c:535
vfs_fsync_range+0x160/0x19c fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
fuse_cache_write_iter fs/fuse/file.c:1470 [inline]
fuse_file_write_iter+0xa20/0xb88 fs/fuse/file.c:1783
do_iter_readv_writev+0x4bc/0x720 fs/read_write.c:-1
vfs_writev+0x29c/0x7cc fs/read_write.c:1057
do_writev+0x128/0x290 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__arm64_sys_writev+0x80/0x94 fs/read_write.c:1168
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
stack backtrace:
CPU: 1 UID: 0 PID: 6842 Comm: syz.4.56 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
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+0x3058/0x30a4 kernel/locking/lockdep.c:5237
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
fprop_fraction_percpu+0xf0/0x270 lib/flex_proportions.c:155
__fprop_add_percpu_max+0x130/0x1f4 lib/flex_proportions.c:186
wb_domain_writeout_add mm/page-writeback.c:562 [inline]
__wb_writeout_add+0xbc/0x27c mm/page-writeback.c:586
__folio_end_writeback+0x380/0x75c mm/page-writeback.c:3003
folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1668
folio_end_writeback+0xd8/0x248 mm/filemap.c:1694
iomap_finish_folio_write+0x1c0/0x2a4 fs/iomap/buffered-io.c:1582
fuse_writepage_finish fs/fuse/file.c:1837 [inline]
fuse_send_writepage fs/fuse/file.c:1887 [inline]
fuse_flush_writepages+0x54c/0x73c fs/fuse/file.c:1912
fuse_writepages_send fs/fuse/file.c:2091 [inline]
fuse_iomap_writeback_range+0x48c/0x152c fs/fuse/file.c:2150
iomap_writeback_range fs/iomap/buffered-io.c:1593 [inline]
iomap_writeback_folio+0xee4/0x1c74 fs/iomap/buffered-io.c:1718
iomap_writepages+0x128/0x25c fs/iomap/buffered-io.c:1770
fuse_writepages+0x208/0x2bc fs/fuse/file.c:2220
do_writepages+0x270/0x468 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:797
fuse_fsync+0x100/0x2b8 fs/fuse/file.c:535
vfs_fsync_range+0x160/0x19c fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
fuse_cache_write_iter fs/fuse/file.c:1470 [inline]
fuse_file_write_iter+0xa20/0xb88 fs/fuse/file.c:1783
do_iter_readv_writev+0x4bc/0x720 fs/read_write.c:-1
vfs_writev+0x29c/0x7cc fs/read_write.c:1057
do_writev+0x128/0x290 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__arm64_sys_writev+0x80/0x94 fs/read_write.c:1168
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---
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