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Mon, 29 Dec 2025 03:09:20 -0800 (PST) Date: Mon, 29 Dec 2025 03:09:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69526160.050a0220.3b1790.0006.GAE@google.com> Subject: [syzbot] [fs?] [mm?] possible deadlock in flush_end_io From: syzbot To: akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: w1xmcswwhrogp9dx16qyzz9kqrcpbcgk X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: A5B3C4000D X-Rspam-User: X-HE-Tag: 1767006561-551067 X-HE-Meta: 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 ScVO0zOU 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 QKiPDkk8 jSkSEq2y8XAPxnDjMdzstKE21IEcomPqJlCVDIPFW2UUOAuepTwUMSyOOz4VEKJqM+13U1ZTH4ro2IxG2TxCbAN9Cd752Pjsn5Ac6FAdOiu58S8TH4kC/UhMEXzaTZaHeAcVWc2HW1l5dOBRX9n6c57ff7+BjzHJkrvZ13BziSWcABM1+0GSR/R3Ov5sd2FGiMBOYnUBFy4NdFjjiMTReaN/cdrXz5f4REfSmcHE9IHlQCxHpoRF49F+oLoAFD2fJF/m2UdVAMKVRz9f0AQOUCtSryvGUyhU3U5Mmp9pDASVu1cObGt4idrl5gGJqyk6KpKhmCarVafjAxseVzwSY2XkizP1IQvvCIeWe4RyQUnvyyddzCl8jX0oDi9tMvZchHYk+RRJ5bGOMSABRCtOAQ72PJdbPjVzjjDMC5d2OgVWeXEb6eKhuffs5RUYSo04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 8f0b4cce4481 Linux 6.19-rc1 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=10f58422580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a dashboard link: https://syzkaller.appspot.com/bug?extid=56189401febf7b380090 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cd4f5f43efc8/disk-8f0b4cce.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aafb35ac3a3c/vmlinux-8f0b4cce.xz kernel image: https://storage.googleapis.com/syzbot-assets/d221fae4ab17/Image-8f0b4cce.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+56189401febf7b380090@syzkaller.appspotmail.com ===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected syzkaller #0 Not tainted ----------------------------------------------------- ksoftirqd/0/15 [HC0[0]:SC1[1]:HE0:SE0] is trying to acquire: ffff0000f9020240 (&xa->xa_lock#10){..-.}-{3:3}, at: __folio_end_writeback+0x10c/0x6f8 mm/page-writeback.c:2990 and this task is already holding: ffff0000c6004818 (&fq->mq_flush_lock){-.-.}-{3:3}, at: flush_end_io+0xb4/0xd68 block/blk-flush.c:211 which would create a new lock dependency: (&fq->mq_flush_lock){-.-.}-{3:3} -> (&xa->xa_lock#10){..-.}-{3:3} but this new dependency connects a HARDIRQ-irq-safe lock: (&fq->mq_flush_lock){-.-.}-{3:3} ... which became HARDIRQ-irq-safe at: lock_acquire+0x140/0x2e0 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:1159 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1171 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:1343 [inline] nvme_handle_cqe drivers/nvme/host/pci.c:1407 [inline] nvme_poll_cq+0x644/0x1018 drivers/nvme/host/pci.c:1434 nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1448 __handle_irq_event_percpu+0x20c/0x8e4 kernel/irq/handle.c:211 handle_irq_event_percpu kernel/irq/handle.c:248 [inline] handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:265 handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764 generic_handle_irq_desc include/linux/irqdesc.h:172 [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:825 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:876 [inline] gic_handle_irq+0x6c/0x18c drivers/irqchip/irq-gic-v3.c:920 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:135 __el1_irq arch/arm64/kernel/entry-common.c:497 [inline] el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 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:1570 [inline] finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:4995 finish_task_switch+0x104/0x5dc kernel/sched/core.c:5112 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x1254/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_hrtimeout_range_clock+0x19c/0x2b4 kernel/time/sleep_timeout.c:207 schedule_hrtimeout_range+0x38/0x4c kernel/time/sleep_timeout.c:263 ep_poll+0xa70/0xd38 fs/eventpoll.c:2028 do_epoll_wait+0x194/0x204 fs/eventpoll.c:2461 do_epoll_pwait+0x70/0x18c fs/eventpoll.c:2491 __do_sys_epoll_pwait fs/eventpoll.c:2504 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2498 [inline] __arm64_sys_epoll_pwait+0x1e0/0x234 fs/eventpoll.c:2498 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 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+0x140/0x2e0 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+0x19c/0x814 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x51c/0x76c kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2405 handle_softirqs+0x31c/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:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:313 d_absolute_path+0xa0/0x148 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x258/0x4d4 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1c4/0x3dc security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x118/0x300 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_statx_path fs/stat.c:299 [inline] vfs_statx+0x178/0x4bc fs/stat.c:356 vfs_fstatat+0x100/0x150 fs/stat.c:375 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __arm64_sys_newfstatat+0x100/0x180 fs/stat.c:536 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 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); lock(&fq->mq_flush_lock); *** DEADLOCK *** 1 lock held by ksoftirqd/0/15: #0: ffff0000c6004818 (&fq->mq_flush_lock){-.-.}-{3:3}, at: flush_end_io+0xb4/0xd68 block/blk-flush.c:211 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&fq->mq_flush_lock){-.-.}-{3:3} { IN-HARDIRQ-W at: lock_acquire+0x140/0x2e0 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:1159 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1171 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:1343 [inline] nvme_handle_cqe drivers/nvme/host/pci.c:1407 [inline] nvme_poll_cq+0x644/0x1018 drivers/nvme/host/pci.c:1434 nvme_irq+0x90/0x240 drivers/nvme/host/pci.c:1448 __handle_irq_event_percpu+0x20c/0x8e4 kernel/irq/handle.c:211 handle_irq_event_percpu kernel/irq/handle.c:248 [inline] handle_irq_event+0x9c/0x1d0 kernel/irq/handle.c:265 handle_fasteoi_irq+0x328/0x8d8 kernel/irq/chip.c:764 generic_handle_irq_desc include/linux/irqdesc.h:172 [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:825 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:876 [inline] gic_handle_irq+0x6c/0x18c drivers/irqchip/irq-gic-v3.c:920 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:135 __el1_irq arch/arm64/kernel/entry-common.c:497 [inline] el1_interrupt+0x3c/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 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:1570 [inline] finish_lock_switch+0xb4/0x1c0 kernel/sched/core.c:4995 finish_task_switch+0x104/0x5dc kernel/sched/core.c:5112 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x1254/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_hrtimeout_range_clock+0x19c/0x2b4 kernel/time/sleep_timeout.c:207 schedule_hrtimeout_range+0x38/0x4c kernel/time/sleep_timeout.c:263 ep_poll+0xa70/0xd38 fs/eventpoll.c:2028 do_epoll_wait+0x194/0x204 fs/eventpoll.c:2461 do_epoll_pwait+0x70/0x18c fs/eventpoll.c:2491 __do_sys_epoll_pwait fs/eventpoll.c:2504 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2498 [inline] __arm64_sys_epoll_pwait+0x1e0/0x234 fs/eventpoll.c:2498 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 IN-SOFTIRQ-W at: lock_acquire+0x140/0x2e0 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 mq_flush_data_end_io+0x270/0x480 block/blk-flush.c:355 __blk_mq_end_request+0x37c/0x57c block/blk-mq.c:1159 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1171 lo_complete_rq+0x124/0x274 drivers/block/loop.c:314 blk_complete_reqs block/blk-mq.c:1244 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1249 handle_softirqs+0x31c/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+0x140/0x2e0 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+0x1668/0x21e8 block/blk-mq.c:3229 __submit_bio+0x1d8/0x4d8 block/blk-core.c:637 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x274/0x990 block/blk-core.c:755 submit_bio_noacct+0xdc0/0x186c block/blk-core.c:879 submit_bio+0x3b4/0x550 block/blk-core.c:921 submit_bio_wait+0x104/0x208 block/bio.c:1391 blkdev_issue_flush+0xb4/0x100 block/blk-flush.c:473 ext4_init_inode_table+0x420/0x780 fs/ext4/ialloc.c:1602 ext4_run_li_request fs/ext4/super.c:3732 [inline] ext4_lazyinit_thread+0x6dc/0x1730 fs/ext4/super.c:3827 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 } ... key at: [] blk_alloc_flush_queue.__key+0x0/0x20 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (&p->sequence){+.-.}-{0:0} { HARDIRQ-ON-W at: lock_acquire+0x140/0x2e0 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+0x19c/0x814 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x51c/0x76c kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2405 handle_softirqs+0x31c/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:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:313 d_absolute_path+0xa0/0x148 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x258/0x4d4 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1c4/0x3dc security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x118/0x300 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_statx_path fs/stat.c:299 [inline] vfs_statx+0x178/0x4bc fs/stat.c:356 vfs_fstatat+0x100/0x150 fs/stat.c:375 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __arm64_sys_newfstatat+0x100/0x180 fs/stat.c:536 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 IN-SOFTIRQ-W at: lock_acquire+0x140/0x2e0 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+0x19c/0x814 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x51c/0x76c kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2405 handle_softirqs+0x31c/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:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:313 d_absolute_path+0xa0/0x148 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x258/0x4d4 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1c4/0x3dc security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x118/0x300 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_statx_path fs/stat.c:299 [inline] vfs_statx+0x178/0x4bc fs/stat.c:356 vfs_fstatat+0x100/0x150 fs/stat.c:375 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __arm64_sys_newfstatat+0x100/0x180 fs/stat.c:536 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INITIAL USE at: lock_acquire+0x140/0x2e0 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+0x19c/0x814 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x51c/0x76c kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x11c/0x194 kernel/time/timer.c:2405 handle_softirqs+0x31c/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:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:313 d_absolute_path+0xa0/0x148 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x258/0x4d4 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1c4/0x3dc security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x118/0x300 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_statx_path fs/stat.c:299 [inline] vfs_statx+0x178/0x4bc fs/stat.c:356 vfs_fstatat+0x100/0x150 fs/stat.c:375 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __arm64_sys_newfstatat+0x100/0x180 fs/stat.c:536 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INITIAL READ USE at: lock_acquire+0x140/0x2e0 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:2278 [inline] wb_do_writeback fs/fs-writeback.c:2376 [inline] wb_workfn+0xa30/0xdc0 fs/fs-writeback.c:2403 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 } ... key at: [] 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+0x380/0x6f8 mm/page-writeback.c:2997 folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1661 folio_end_writeback+0xd8/0x248 mm/filemap.c:1687 iomap_finish_folio_write+0x1c0/0x2a4 fs/iomap/buffered-io.c:1713 fuse_writepage_finish fs/fuse/file.c:1903 [inline] fuse_send_writepage fs/fuse/file.c:1954 [inline] fuse_flush_writepages+0x578/0x788 fs/fuse/file.c:1979 fuse_writepages_send fs/fuse/file.c:2158 [inline] fuse_iomap_writeback_submit+0x188/0x220 fs/fuse/file.c:2260 iomap_writepages+0x1dc/0x25c fs/iomap/buffered-io.c:1916 fuse_writepages+0x208/0x2bc fs/fuse/file.c:2295 do_writepages+0x270/0x468 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range mm/filemap.c:412 [inline] file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:786 fuse_fsync+0x100/0x2b8 fs/fuse/file.c:547 vfs_fsync_range+0x160/0x19c fs/sync.c:188 generic_write_sync include/linux/fs.h:2616 [inline] fuse_cache_write_iter fs/fuse/file.c:1527 [inline] fuse_file_write_iter+0xa20/0xb88 fs/fuse/file.c:1849 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+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> (&xa->xa_lock#10){..-.}-{3:3} { IN-SOFTIRQ-W at: lock_acquire+0x140/0x2e0 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/0x6f8 mm/page-writeback.c:2990 folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1661 folio_end_writeback+0xd8/0x248 mm/filemap.c:1687 end_buffer_async_write+0x20c/0x350 fs/buffer.c:419 end_bio_bh_io_sync+0xb0/0x184 fs/buffer.c:2776 bio_endio+0x8d4/0x910 block/bio.c:1675 blk_update_request+0x474/0xba8 block/blk-mq.c:1007 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1169 lo_complete_rq+0x124/0x274 drivers/block/loop.c:314 blk_complete_reqs block/blk-mq.c:1244 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1249 handle_softirqs+0x31c/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+0x140/0x2e0 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:904 shmem_alloc_and_add_folio+0x758/0x10c4 mm/shmem.c:1958 shmem_get_folio_gfp+0x4d4/0x159c mm/shmem.c:2556 shmem_read_folio_gfp+0x8c/0xf0 mm/shmem.c:5974 drm_gem_get_pages+0x1cc/0x7c0 drivers/gpu/drm/drm_gem.c:654 drm_gem_shmem_get_pages_locked+0x1d4/0x364 drivers/gpu/drm/drm_gem_shmem_helper.c:239 drm_gem_shmem_pin_locked+0x1f8/0x410 drivers/gpu/drm/drm_gem_shmem_helper.c:300 drm_gem_shmem_vmap_locked+0x3cc/0x658 drivers/gpu/drm/drm_gem_shmem_helper.c:404 drm_gem_shmem_object_vmap+0x28/0x38 include/drm/drm_gem_shmem_helper.h:245 drm_gem_vmap_locked drivers/gpu/drm/drm_gem.c:1269 [inline] drm_gem_vmap+0x104/0x1d8 drivers/gpu/drm/drm_gem.c:1311 drm_client_buffer_vmap+0x68/0xb0 drivers/gpu/drm/drm_client.c:355 drm_fbdev_shmem_driver_fbdev_probe+0x1f4/0x700 drivers/gpu/drm/drm_fbdev_shmem.c:159 drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1562 [inline] __drm_fb_helper_initial_config_and_unlock+0x108c/0x1728 drivers/gpu/drm/drm_fb_helper.c:1741 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1828 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:66 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:143 drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:168 drm_client_setup+0x114/0x228 drivers/gpu/drm/clients/drm_client_setup.c:46 vkms_create+0x370/0x420 drivers/gpu/drm/vkms/vkms_drv.c:211 vkms_init+0x64/0x9c drivers/gpu/drm/vkms/vkms_drv.c:239 do_one_initcall+0x248/0x9b4 init/main.c:1378 do_initcall_level+0x128/0x1c4 init/main.c:1440 do_initcalls+0x70/0xd0 init/main.c:1456 do_basic_setup+0x78/0x8c init/main.c:1475 kernel_init_freeable+0x268/0x39c init/main.c:1688 kernel_init+0x24/0x1dc init/main.c:1578 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 } ... key at: [] 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/0x6f8 mm/page-writeback.c:2990 folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1661 folio_end_writeback+0xd8/0x248 mm/filemap.c:1687 f2fs_write_end_io+0x6c0/0xa78 fs/f2fs/data.c:362 bio_endio+0x8d4/0x910 block/bio.c:1675 blk_update_request+0x474/0xba8 block/blk-mq.c:1007 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1169 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:1159 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1171 lo_complete_rq+0x124/0x274 drivers/block/loop.c:314 blk_complete_reqs block/blk-mq.c:1244 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1249 handle_softirqs+0x31c/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 stack backtrace: CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 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+0x140/0x2e0 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/0x6f8 mm/page-writeback.c:2990 folio_end_writeback_no_dropbehind+0xd0/0x204 mm/filemap.c:1661 folio_end_writeback+0xd8/0x248 mm/filemap.c:1687 f2fs_write_end_io+0x6c0/0xa78 fs/f2fs/data.c:362 bio_endio+0x8d4/0x910 block/bio.c:1675 blk_update_request+0x474/0xba8 block/blk-mq.c:1007 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1169 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:1159 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1171 lo_complete_rq+0x124/0x274 drivers/block/loop.c:314 blk_complete_reqs block/blk-mq.c:1244 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1249 handle_softirqs+0x31c/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 --- 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 syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) 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