====================================================== WARNING: possible circular locking dependency detected 6.9.0-syzkaller-g6f130e4d4a5f #0 Not tainted ------------------------------------------------------ syz-executor305/8600 is trying to acquire lock: ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline] ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262 but task is already holding lock: ffff8880b9538828 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff8880b9538828 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_start_locking+0x83/0x620 mm/mmap_lock.c:230 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (lock#9){+.+.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] __mmap_lock_do_trace_start_locking+0x9c/0x620 mm/mmap_lock.c:230 __mmap_lock_trace_start_locking include/linux/mmap_lock.h:29 [inline] mmap_read_trylock include/linux/mmap_lock.h:164 [inline] stack_map_get_build_id_offset+0x98d/0x9d0 kernel/bpf/stackmap.c:141 __bpf_get_stack+0x4ad/0x5a0 kernel/bpf/stackmap.c:449 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1994 [inline] bpf_get_stack_raw_tp+0x1a3/0x240 kernel/trace/bpf_trace.c:1984 bpf_prog_ec3b2eefa702d8d3+0x2a/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2444 __traceiter_tlb_flush+0x77/0xd0 include/trace/events/tlb.h:38 trace_tlb_flush+0x118/0x140 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x7cb/0xae0 context_switch kernel/sched/core.c:5392 [inline] __schedule+0x1066/0x4a50 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 ptrace_stop+0x5b4/0x940 kernel/signal.c:2358 ptrace_do_notify kernel/signal.c:2395 [inline] ptrace_notify+0x255/0x380 kernel/signal.c:2407 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x273/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 raw_spin_rq_lock kernel/sched/sched.h:1406 [inline] rq_lock kernel/sched/sched.h:1702 [inline] task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12709 sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4844 copy_process+0x2217/0x3dc0 kernel/fork.c:2499 kernel_clone+0x226/0x8f0 kernel/fork.c:2797 user_mode_thread+0x132/0x1a0 kernel/fork.c:2875 rest_init+0x23/0x300 init/main.c:707 start_kernel+0x47a/0x500 init/main.c:1084 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 -> #0 (&p->pi_lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline] try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262 rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655 __rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:814 [inline] get_mem_cgroup_from_mm+0x1b2/0x2a0 mm/memcontrol.c:1113 get_mm_memcg_path+0x1b/0x600 mm/mmap_lock.c:202 __mmap_lock_do_trace_start_locking+0x134/0x620 mm/mmap_lock.c:230 __mmap_lock_trace_start_locking include/linux/mmap_lock.h:29 [inline] mmap_read_lock include/linux/mmap_lock.h:145 [inline] acct_collect+0x7e7/0x830 kernel/acct.c:563 do_exit+0x92a/0x27e0 kernel/exit.c:856 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &p->pi_lock --> &rq->__lock --> lock#9 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#9); lock(&rq->__lock); lock(lock#9); lock(&p->pi_lock); *** DEADLOCK *** 1 lock held by syz-executor305/8600: #0: ffff8880b9538828 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] #0: ffff8880b9538828 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_start_locking+0x83/0x620 mm/mmap_lock.c:230 stack backtrace: CPU: 1 PID: 8600 Comm: syz-executor305 Not tainted 6.9.0-syzkaller-g6f130e4d4a5f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline] try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262 rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655 __rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:814 [inline] get_mem_cgroup_from_mm+0x1b2/0x2a0 mm/memcontrol.c:1113 get_mm_memcg_path+0x1b/0x600 mm/mmap_lock.c:202 __mmap_lock_do_trace_start_locking+0x134/0x620 mm/mmap_lock.c:230 __mmap_lock_trace_start_locking include/linux/mmap_lock.h:29 [inline] mmap_read_lock include/linux/mmap_lock.h:145 [inline] acct_collect+0x7e7/0x830 kernel/acct.c:563 do_exit+0x92a/0x27e0 kernel/exit.c:856 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f4d323079 Code: 90 49 c7 c0 b8 ff ff ff be e7 00 00 00 ba 3c 00 00 00 eb 12 0f 1f 44 00 00 89 d0 0f 05 48 3d 00 f0 ff ff 77 1c f4 89 f0 0f 05 <48> 3d 00 f0 ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 RSP: 002b:00007fff85febaa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5f4d323079 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f5f4d39e2b0 R08: ffffffffffffffb8 R09: 00000000000000a0 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007f5f4d39e2b0 R13: 0000000000000000 R14: 00007f5f4d39ed20 R15: 00007f5f4d2f4200