================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. syz-executor.5/5652 [HC0[0]:SC0[0]:HE1:SE1] takes: ffff888082b12518 (&sighand->siglock){?.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888082b12518 (&sighand->siglock){?.-.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:530 [inline] ffff888082b12518 (&sighand->siglock){?.-.}-{2:2}, at: ptrace_set_stopped kernel/ptrace.c:391 [inline] ffff888082b12518 (&sighand->siglock){?.-.}-{2:2}, at: ptrace_attach+0x401/0x650 kernel/ptrace.c:478 {IN-HARDIRQ-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 lock_task_sighand include/linux/sched/signal.h:748 [inline] do_send_sig_info kernel/signal.c:1309 [inline] group_send_sig_info+0x288/0x300 kernel/signal.c:1460 do_bpf_send_signal+0x9a/0x1d0 kernel/trace/bpf_trace.c:834 irq_work_single+0x1b3/0x250 kernel/irq_work.c:221 irq_work_run_list+0x92/0xc0 kernel/irq_work.c:252 irq_work_run+0x58/0xd0 kernel/irq_work.c:261 __sysvec_irq_work+0x8c/0x3a0 arch/x86/kernel/irq_work.c:22 sysvec_irq_work+0x43/0xb0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:670 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 expire_timers kernel/time/timer.c:1750 [inline] __run_timers+0x759/0xb20 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x216/0x8d5 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5721 rcu_lock_acquire include/linux/rcupdate.h:301 [inline] rcu_read_lock include/linux/rcupdate.h:747 [inline] pfn_valid include/linux/mmzone.h:2028 [inline] page_table_check_set mm/page_table_check.c:105 [inline] __page_table_check_ptes_set+0x4b8/0xb70 mm/page_table_check.c:196 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] set_ptes include/linux/pgtable.h:234 [inline] copy_present_pte mm/memory.c:991 [inline] copy_pte_range mm/memory.c:1095 [inline] copy_pmd_range mm/memory.c:1180 [inline] copy_pud_range mm/memory.c:1217 [inline] copy_p4d_range mm/memory.c:1241 [inline] copy_page_range+0x1523/0x3c40 mm/memory.c:1339 dup_mmap kernel/fork.c:765 [inline] dup_mm kernel/fork.c:1709 [inline] copy_mm kernel/fork.c:1758 [inline] copy_process+0x5c30/0x9770 kernel/fork.c:2520 kernel_clone+0xfd/0x940 kernel/fork.c:2925 __do_sys_clone+0xba/0x100 kernel/fork.c:3068 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a irq event stamp: 2069 hardirqs last enabled at (2069): [] irqentry_exit+0x3b/0x80 kernel/entry/common.c:435 hardirqs last disabled at (2068): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (1982): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1982): [] fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline] softirqs last enabled at (1982): [] fpu_clone+0x342/0xb60 arch/x86/kernel/fpu/core.c:634 softirqs last disabled at (1980): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1980): [] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline] softirqs last disabled at (1980): [] fpu_clone+0x2d7/0xb60 arch/x86/kernel/fpu/core.c:630 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 2 locks held by syz-executor.5/5652: #0: ffff888026a092c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: class_mutex_intr_constructor include/linux/mutex.h:225 [inline] #0: ffff888026a092c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: ptrace_attach+0x1eb/0x650 kernel/ptrace.c:455 #1: ffffffff8cc0a098 (tasklist_lock){++++}-{2:2}, at: class_write_lock_constructor include/linux/spinlock.h:564 [inline] #1: ffffffff8cc0a098 (tasklist_lock){++++}-{2:2}, at: ptrace_attach+0x2c3/0x650 kernel/ptrace.c:464 stack backtrace: CPU: 1 PID: 5652 Comm: syz-executor.5 Not tainted 6.7.0-rc1-next-20231117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3970 [inline] valid_state kernel/locking/lockdep.c:4012 [inline] mark_lock_irq kernel/locking/lockdep.c:4215 [inline] mark_lock+0x91a/0xc50 kernel/locking/lockdep.c:4677 mark_usage kernel/locking/lockdep.c:4586 [inline] __lock_acquire+0x919/0x3b10 kernel/locking/lockdep.c:5090 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:530 [inline] ptrace_set_stopped kernel/ptrace.c:391 [inline] ptrace_attach+0x401/0x650 kernel/ptrace.c:478 __do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f9042c7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f90439d00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00007f9042d9c120 RCX: 00007f9042c7cae9 RDX: 0000000000000000 RSI: 000000000000003a RDI: 0000000000000010 RBP: 00007f9042cc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9042d9c120 R15: 00007ffcc4b2c208