================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. strace-static-x/5065 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff8880257cd358 (&sighand->siglock){+.?.}-{2:2}, at: __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 {SOFTIRQ-ON-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 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 irq event stamp: 45247 hardirqs last enabled at (45246): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (45246): [] _raw_spin_unlock_irqrestore+0x4e/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (45247): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (45247): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:162 softirqs last enabled at (44938): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (44938): [] __do_softirq+0x591/0x8d5 kernel/softirq.c:582 softirqs last disabled at (45233): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (45233): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (45233): [] irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 3 locks held by strace-static-x/5065: #0: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2152 [inline] #0: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_core+0x7cc/0x16b0 kernel/rcu/tree.c:2431 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2310 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x410 kernel/trace/bpf_trace.c:2350 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405 stack backtrace: CPU: 1 PID: 5065 Comm: strace-static-x 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:4566 [inline] __lock_acquire+0x13c2/0x3b10 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_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 bpf_send_signal_common+0x2e4/0x3a0 kernel/trace/bpf_trace.c:877 ____bpf_send_signal kernel/trace/bpf_trace.c:882 [inline] bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:880 bpf_prog_a7bf4e27797d188e+0x22/0x24 bpf_dispatcher_nop_func include/linux/bpf.h:1196 [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:2311 [inline] bpf_trace_run2+0x14e/0x410 kernel/trace/bpf_trace.c:2350 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0xf6/0x150 mm/slab_common.c:1043 security_cred_free+0xc3/0x130 security/security.c:3018 put_cred_rcu+0x126/0x570 kernel/cred.c:118 rcu_do_batch kernel/rcu/tree.c:2158 [inline] rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2431 __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 RIP: 0010:finish_task_switch.isra.0+0x220/0xcb0 kernel/sched/core.c:5273 Code: 90 0a 00 00 44 8b 0d 27 ca bd 0d 45 85 c9 0f 85 bc 01 00 00 48 89 df e8 ce f8 ff ff e8 29 7c 33 00 fb 65 48 8b 1d b0 6f a8 7e <48> 8d bb d8 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90003acfa70 EFLAGS: 00000206 RAX: 000000000000b0af RBX: ffff888014bb9dc0 RCX: 1ffffffff1e31619 RDX: 0000000000000000 RSI: ffffffff8accbfe0 RDI: ffffffff8b2f1520 RBP: ffffc90003acfab8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f18e357 R11: 0000000000000000 R12: ffff8880b993d478 R13: ffff8880193c0000 R14: 0000000000000000 R15: ffff8880b993c700 context_switch kernel/sched/core.c:5402 [inline] __schedule+0xf1d/0x5c00 kernel/sched/core.c:6726 __schedule_loop kernel/sched/core.c:6801 [inline] schedule+0xe7/0x270 kernel/sched/core.c:6816 do_wait+0x1dd/0x530 kernel/exit.c:1634 kernel_wait4+0x16c/0x280 kernel/exit.c:1788 __do_sys_wait4+0x15b/0x170 kernel/exit.c:1816 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: 0033:0x4d6ad6 Code: 00 00 00 90 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 RSP: 002b:00007ffc5979b068 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004d6ad6 RDX: 0000000040000000 RSI: 00007ffc5979b08c RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000017 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006f0400 R13: 00007ffc5979b08c R14: 00000000006eab90 R15: 000000000063f160 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 00 00 add %al,(%rax) 2: 44 8b 0d 27 ca bd 0d mov 0xdbdca27(%rip),%r9d # 0xdbdca30 9: 45 85 c9 test %r9d,%r9d c: 0f 85 bc 01 00 00 jne 0x1ce 12: 48 89 df mov %rbx,%rdi 15: e8 ce f8 ff ff call 0xfffff8e8 1a: e8 29 7c 33 00 call 0x337c48 1f: fb sti 20: 65 48 8b 1d b0 6f a8 mov %gs:0x7ea86fb0(%rip),%rbx # 0x7ea86fd8 27: 7e * 28: 48 8d bb d8 15 00 00 lea 0x15d8(%rbx),%rdi <-- trapping instruction 2f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 36: fc ff df 39: 48 89 fa mov %rdi,%rdx 3c: 48 rex.W 3d: c1 .byte 0xc1