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x=1789673711; b=r+wm7LQs1yT6/149nVuNJBnWjb7EX8Msj55brV9BXbjWT1pxzlxPOggDBw+I3yQPiUx5YgIO cv2H779GkWnOe+KBizlJdpOjJwm7ArFH12+TPeTL73MBH3jMtXIroQFV9B2ttU+MGpYBIncWTSJ gT50N4bL6IWvzfGvtoIXfsdY= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id a668b9281ca36f02; Thu, 10 Sep 2026 19:35:01 +0000 X-Mizu-Trace-ID: a668b9281ca36f02 X-Migadu-Flow: FLOW_OUT Date: Thu, 10 Sep 2026 12:34:54 -0700 From: Shakeel Butt To: syzbot Cc: 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, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] [cgroups?] inconsistent lock state in fs_reclaim_acquire (4) Message-ID: References: <6aa1e191.f81106d8.2ab401.0004.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6aa1e191.f81106d8.2ab401.0004.GAE@google.com> On Wed, Sep 09, 2026 at 03:45:37PM -0700, syzbot wrote: > 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 > > Seems like HID issue which is being fixed by http://lore.kernel.org/20260910153746.16222-1-ngocthang2710.1999@gmail.com #syz set subsystems: hid