================================ WARNING: inconsistent lock state 6.7.0-rc1-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/2798 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888111dcd798 (&sighand->siglock){+.?.}-{2:2}, at: __lock_task_sighand+0x67/0x1a0 kernel/signal.c:1422 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0xcd/0x2d0 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+0x18b/0x2a0 kernel/ptrace.c:478 __do_sys_ptrace+0xa1/0x150 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+0x63/0x6b irq event stamp: 2147 hardirqs last enabled at (2146): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (2146): [] _raw_spin_unlock_irqrestore+0x4e/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (2147): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2147): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:162 softirqs last enabled at (1614): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (1614): [] bpf_link_free_id kernel/bpf/syscall.c:2820 [inline] softirqs last enabled at (1614): [] bpf_link_free_id kernel/bpf/syscall.c:2813 [inline] softirqs last enabled at (1614): [] bpf_link_free+0x33/0x60 kernel/bpf/syscall.c:2848 softirqs last disabled at (1615): [] do_softirq kernel/softirq.c:454 [inline] softirqs last disabled at (1615): [] do_softirq+0xaa/0xe0 kernel/softirq.c:441 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 3 locks held by syz-executor.0/2798: #0: ffffffff82f8cd00 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff82f8cd00 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2152 [inline] #0: ffffffff82f8cd00 (rcu_callback){....}-{0:0}, at: rcu_core+0x2d3/0x9f0 kernel/rcu/tree.c:2431 #1: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #1: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #1: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2306 [inline] #1: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x51/0x1b0 kernel/trace/bpf_trace.c:2346 #2: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #2: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #2: ffffffff82f8cdc0 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x24/0x1a0 kernel/signal.c:1405 stack backtrace: CPU: 1 PID: 2798 Comm: syz-executor.0 Not tainted 6.7.0-rc1-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+0x5c/0xb0 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+0x698/0x7d0 kernel/locking/lockdep.c:4677 mark_usage kernel/locking/lockdep.c:4566 [inline] __lock_acquire+0xada/0x1ab0 kernel/locking/lockdep.c:5090 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0xcd/0x2d0 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+0x67/0x1a0 kernel/signal.c:1422 lock_task_sighand include/linux/sched/signal.h:745 [inline] do_send_sig_info kernel/signal.c:1309 [inline] group_send_sig_info+0xd3/0x1b0 kernel/signal.c:1460 ____bpf_send_signal kernel/trace/bpf_trace.c:882 [inline] bpf_send_signal+0xe/0x20 kernel/trace/bpf_trace.c:880 ___bpf_prog_run+0x2f9/0x27c0 kernel/bpf/core.c:1958 __bpf_prog_run32+0x65/0x90 kernel/bpf/core.c:2197 bpf_dispatcher_nop_func include/linux/bpf.h:1192 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2307 [inline] bpf_trace_run2+0x7f/0x1b0 kernel/trace/bpf_trace.c:2346 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0xde/0x120 mm/slab_common.c:1043 security_cred_free+0x3b/0x50 security/security.c:2934 put_cred_rcu+0x46/0x130 kernel/cred.c:118 rcu_do_batch kernel/rcu/tree.c:2158 [inline] rcu_core+0x38a/0x9f0 kernel/rcu/tree.c:2431 __do_softirq+0x15f/0x421 kernel/softirq.c:553 do_softirq kernel/softirq.c:454 [inline] do_softirq+0xaa/0xe0 kernel/softirq.c:441 __local_bh_enable_ip+0xb3/0xc0 kernel/softirq.c:381 spin_unlock_bh include/linux/spinlock.h:396 [inline] bpf_link_free_id kernel/bpf/syscall.c:2820 [inline] bpf_link_free_id kernel/bpf/syscall.c:2813 [inline] bpf_link_free+0x33/0x60 kernel/bpf/syscall.c:2848 bpf_link_put_direct kernel/bpf/syscall.c:2882 [inline] bpf_link_release+0x16/0x20 kernel/bpf/syscall.c:2889 __fput+0x8d/0x2e0 fs/file_table.c:394 __do_sys_close fs/open.c:1590 [inline] __se_sys_close fs/open.c:1575 [inline] __x64_sys_close+0x38/0x80 fs/open.c:1575 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+0x63/0x6b RIP: 0033:0x7f7aa39d29da Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007fff88916210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f7aa39d29da RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000226 R08: 0000001b2c360000 R09: 00007f7aa3af2f8c R10: 00007fff88916360 R11: 0000000000000293 R12: 00007f7aa3557748 R13: ffffffffffffffff R14: 00007f7aa3557000 R15: 000000000000b89e