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2002:a05:6820:179b:b0:6b1:42ab:d040 with SMTP id 006d021491bc7-6b6fd3c83cbmr21512508eaf.28.1788993937575; Wed, 09 Sep 2026 15:45:37 -0700 (PDT) Date: Wed, 09 Sep 2026 15:45:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa1e191.f81106d8.2ab401.0004.GAE@google.com> Subject: [syzbot] [mm?] [cgroups?] inconsistent lock state in fs_reclaim_acquire (4) From: syzbot To: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 34c9c5517033 Merge 7.3-rc2 into usb-next git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=1408d749580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c451f9f64434b622 dashboard link: https://syzkaller.appspot.com/bug?extid=093e05755c2d99caab91 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102c2ef9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156d7af9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8a384e63cde6/disk-34c9c551.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e5a73decdc30/vmlinux-34c9c551.xz kernel image: https://storage.googleapis.com/syzbot-assets/13abc163bbdc/bzImage-34c9c551.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+093e05755c2d99caab91@syzkaller.appspotmail.com ================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.3.17/3981 [HC0[0]:SC1[1]:HE0:SE0] takes: ffffffff89ab7bc0 (fs_reclaim){+.?.}-{0:0}, at: might_alloc include/linux/sched/mm.h:316 [inline] ffffffff89ab7bc0 (fs_reclaim){+.?.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4636 [inline] ffffffff89ab7bc0 (fs_reclaim){+.?.}-{0:0}, at: slab_alloc_node mm/slub.c:4974 [inline] ffffffff89ab7bc0 (fs_reclaim){+.?.}-{0:0}, at: __do_kmalloc_node mm/slub.c:5413 [inline] ffffffff89ab7bc0 (fs_reclaim){+.?.}-{0:0}, at: __kmalloc_node_track_caller_noprof+0xcc/0x820 mm/slub.c:5545 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __fs_reclaim_acquire mm/page_alloc.c:4375 [inline] fs_reclaim_acquire+0xc4/0x100 mm/page_alloc.c:4389 might_alloc include/linux/sched/mm.h:316 [inline] xa_alloc include/linux/xarray.h:876 [inline] mem_cgroup_alloc mm/memcontrol.c:4160 [inline] mem_cgroup_css_alloc+0x7e/0x1ce0 mm/memcontrol.c:4225 cgroup_init_subsys+0x223/0x700 kernel/cgroup/cgroup.c:6431 cgroup_init+0x569/0xe50 kernel/cgroup/cgroup.c:6558 start_kernel+0x470/0x490 init/main.c:1176 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x158 irq event stamp: 317 hardirqs last enabled at (316): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (316): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:221 hardirqs last disabled at (317): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:153 [inline] hardirqs last disabled at (317): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:181 softirqs last enabled at (302): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last enabled at (302): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last enabled at (302): [] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 softirqs last disabled at (313): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (313): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (313): [] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(fs_reclaim); lock(fs_reclaim); *** DEADLOCK *** locks held by syz.3.17/3981: 1, on CPU#0: #0: ffff888122130870 (&hiddev->existancelock){+.+.}-{4:4}, at: hiddev_ioctl+0x165/0x15b0 drivers/hid/usbhid/hiddev.c:610 stack backtrace: CPU: 0 UID: 0 PID: 3981 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_usage_bug.part.0+0x258/0x340 kernel/locking/lockdep.c:4086 print_usage_bug kernel/locking/lockdep.c:4054 [inline] valid_state kernel/locking/lockdep.c:4100 [inline] mark_lock_irq kernel/locking/lockdep.c:4311 [inline] mark_lock+0x956/0x1020 kernel/locking/lockdep.c:4797 mark_usage kernel/locking/lockdep.c:4686 [inline] __lock_acquire+0x7f1/0x1f40 kernel/locking/lockdep.c:5242 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __fs_reclaim_acquire mm/page_alloc.c:4375 [inline] fs_reclaim_acquire+0xc4/0x100 mm/page_alloc.c:4389 might_alloc include/linux/sched/mm.h:316 [inline] slab_pre_alloc_hook mm/slub.c:4636 [inline] slab_alloc_node mm/slub.c:4974 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_node_track_caller_noprof+0xcc/0x820 mm/slub.c:5545 alloc_dr drivers/base/devres.c:141 [inline] devm_kmalloc+0xa5/0x2b0 drivers/base/devres.c:951 devm_kzalloc include/linux/device/devres.h:50 [inline] mt_allocate_report_data+0x59/0xcc0 drivers/hid/hid-multitouch.c:695 mt_find_report_data drivers/hid/hid-multitouch.c:745 [inline] mt_event+0x1bf/0x270 drivers/hid/hid-multitouch.c:1570 hid_process_event+0x37d/0x5a0 drivers/hid/hid-core.c:1572 hid_process_report drivers/hid/hid-core.c:1730 [inline] hid_report_raw_event+0xb14/0x14c0 drivers/hid/hid-core.c:2109 __hid_input_report.constprop.0+0x349/0x470 drivers/hid/hid-core.c:2180 hid_ctrl+0x4a4/0x560 drivers/hid/usbhid/hid-core.c:486 __usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 dummy_timer+0xdb2/0x3700 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:221 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 f7 05 fa 48 89 df e8 de 4d 06 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 65 a3 f8 f9 65 48 83 3d d4 ee 98 05 00 74 16 5b RSP: 0018:ffffc90001bff9f0 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff8881f5625fc0 RCX: 0000000000000040 RDX: 0000000000000001 RSI: ffffffff89329b79 RDI: ffffffff87d2b780 RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8881f5625fc0 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8881f5626008 __mod_timer+0x409/0xca0 kernel/time/timer.c:1139 add_timer+0x62/0x90 kernel/time/timer.c:1249 schedule_timeout+0x122/0x280 kernel/time/sleep_timeout.c:98 usbhid_wait_io+0x24e/0x420 drivers/hid/usbhid/hid-core.c:648 usbhid_init_reports+0x1a7/0x390 drivers/hid/usbhid/hid-core.c:787 hiddev_ioctl+0xddb/0x15b0 drivers/hid/usbhid/hiddev.c:794 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f01bd5ee159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f01bd42e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f01bd876090 RCX: 00007f01bd5ee159 RDX: 0000000000000000 RSI: 00000000c018480b RDI: 0000000000000004 RBP: 00007f01bd68503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f01bd876128 R14: 00007f01bd876090 R15: 00007ffe3b7b3048 ------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=2 set at [] prepare_to_wait_event+0x8d/0x720 kernel/sched/wait.c:318 WARNING: kernel/sched/core.c:9179 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9179, CPU#0: syz.3.17/3981 Modules linked in: CPU: 0 UID: 0 PID: 3981 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__might_sleep+0x97/0xc0 kernel/sched/core.c:9179 Code: 8b 94 24 c0 17 00 00 48 85 d2 75 14 48 83 c4 08 89 ee 48 89 df 31 d2 5b 5d 41 5c e9 33 fc ff ff 48 8d 3d 5c d9 92 09 48 89 d1 <67> 48 0f b9 3a eb db e8 fd 20 9c 00 eb 9f 89 74 24 04 e8 22 21 9c RSP: 0018:ffffc90000007828 EFLAGS: 00010082 RAX: dffffc0000000000 RBX: ffffffff8931ad45 RCX: ffffffff818d66ad RDX: ffffffff818d66ad RSI: 0000000000000002 RDI: ffffffff8b16a1e0 RBP: 0000000000000142 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888107ed3c80 R13: 0000000000000dc0 R14: 00000000ffffffff R15: 00000000ffffffff FS: 00007f01bd42e6c0(0000) GS:ffff8882683e4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f01bd42dff8 CR3: 00000001214ba000 CR4: 00000000003506f0 Call Trace: might_alloc include/linux/sched/mm.h:322 [inline] slab_pre_alloc_hook mm/slub.c:4636 [inline] slab_alloc_node mm/slub.c:4974 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_node_track_caller_noprof+0x473/0x820 mm/slub.c:5545 alloc_dr drivers/base/devres.c:141 [inline] devm_kmalloc+0xa5/0x2b0 drivers/base/devres.c:951 devm_kzalloc include/linux/device/devres.h:50 [inline] mt_allocate_report_data+0x59/0xcc0 drivers/hid/hid-multitouch.c:695 mt_find_report_data drivers/hid/hid-multitouch.c:745 [inline] mt_event+0x1bf/0x270 drivers/hid/hid-multitouch.c:1570 hid_process_event+0x37d/0x5a0 drivers/hid/hid-core.c:1572 hid_process_report drivers/hid/hid-core.c:1730 [inline] hid_report_raw_event+0xb14/0x14c0 drivers/hid/hid-core.c:2109 __hid_input_report.constprop.0+0x349/0x470 drivers/hid/hid-core.c:2180 hid_ctrl+0x4a4/0x560 drivers/hid/usbhid/hid-core.c:486 __usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 dummy_timer+0xdb2/0x3700 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:221 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 f7 05 fa 48 89 df e8 de 4d 06 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 65 a3 f8 f9 65 48 83 3d d4 ee 98 05 00 74 16 5b RSP: 0018:ffffc90001bff9f0 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff8881f5625fc0 RCX: 0000000000000040 RDX: 0000000000000001 RSI: ffffffff89329b79 RDI: ffffffff87d2b780 RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8881f5625fc0 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8881f5626008 __mod_timer+0x409/0xca0 kernel/time/timer.c:1139 add_timer+0x62/0x90 kernel/time/timer.c:1249 schedule_timeout+0x122/0x280 kernel/time/sleep_timeout.c:98 usbhid_wait_io+0x24e/0x420 drivers/hid/usbhid/hid-core.c:648 usbhid_init_reports+0x1a7/0x390 drivers/hid/usbhid/hid-core.c:787 hiddev_ioctl+0xddb/0x15b0 drivers/hid/usbhid/hiddev.c:794 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f01bd5ee159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f01bd42e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f01bd876090 RCX: 00007f01bd5ee159 RDX: 0000000000000000 RSI: 00000000c018480b RDI: 0000000000000004 RBP: 00007f01bd68503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f01bd876128 R14: 00007f01bd876090 R15: 00007ffe3b7b3048 ---------------- Code disassembly (best guess): 0: f5 cmc 1: 53 push %rbx 2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 7: 48 89 fb mov %rdi,%rbx a: 48 83 c7 18 add $0x18,%rdi e: e8 56 f7 05 fa call 0xfa05f769 13: 48 89 df mov %rbx,%rdi 16: e8 de 4d 06 fa call 0xfa064df9 1b: f7 c5 00 02 00 00 test $0x200,%ebp 21: 75 23 jne 0x46 23: 9c pushf 24: 58 pop %rax 25: f6 c4 02 test $0x2,%ah 28: 75 37 jne 0x61 * 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2f: e8 65 a3 f8 f9 call 0xf9f8a399 34: 65 48 83 3d d4 ee 98 cmpq $0x0,%gs:0x598eed4(%rip) # 0x598ef11 3b: 05 00 3d: 74 16 je 0x55 3f: 5b pop %rbx --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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