====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 Not tainted ------------------------------------------------------ syz-executor.1/7287 is trying to acquire lock: ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x8f/0x630 mm/mmap_lock.c:237 but task is already holding lock: ffff8880b953e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&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] _raw_spin_rq_lock_irqsave kernel/sched/sched.h:1425 [inline] rq_lock_irqsave kernel/sched/sched.h:1686 [inline] class_rq_lock_irqsave_constructor kernel/sched/sched.h:1740 [inline] sched_mm_cid_exit_signals+0x17b/0x4b0 kernel/sched/core.c:12004 exit_signals+0x2a1/0x5c0 kernel/signal.c:3014 do_exit+0x6b4/0x27e0 kernel/exit.c:833 __do_sys_exit kernel/exit.c:990 [inline] __se_sys_exit kernel/exit.c:988 [inline] __pfx___ia32_sys_exit+0x0/0x10 kernel/exit.c:988 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sighand->siglock){-.-.}-{2:2}: 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 __lock_task_sighand+0x149/0x2d0 kernel/signal.c:1412 lock_task_sighand include/linux/sched/signal.h:746 [inline] do_send_sig_info kernel/signal.c:1300 [inline] group_send_sig_info+0x274/0x310 kernel/signal.c:1451 bpf_send_signal_common+0x2dd/0x430 kernel/trace/bpf_trace.c:881 ____bpf_send_signal_thread kernel/trace/bpf_trace.c:898 [inline] bpf_send_signal_thread+0x16/0x20 kernel/trace/bpf_trace.c:896 bpf_prog_682b67a395ac5c66+0x11/0x1a 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_run4+0x334/0x590 kernel/trace/bpf_trace.c:2446 trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:52 [inline] __mmap_lock_do_trace_acquire_returned+0x5c8/0x630 mm/mmap_lock.c:237 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline] mmap_write_lock_killable include/linux/mmap_lock.h:123 [inline] vm_mmap_pgoff+0x3a7/0x3d0 mm/util.c:571 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (lock#10){+.+.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] __mmap_lock_do_trace_acquire_returned+0xa8/0x630 mm/mmap_lock.c:237 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline] mmap_read_trylock include/linux/mmap_lock.h:164 [inline] stack_map_get_build_id_offset+0x9af/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+0x42/0x46 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 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+0x1066/0x4a20 kernel/sched/core.c:6745 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 try_charge_memcg+0x52c/0x1840 mm/memcontrol.c:2905 try_charge mm/memcontrol.c:3092 [inline] charge_memcg+0xa2/0x160 mm/memcontrol.c:7497 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:7512 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] folio_prealloc+0x52/0x170 mm/memory.c:1056 wp_page_copy mm/memory.c:3291 [inline] do_wp_page+0x11cc/0x5310 mm/memory.c:3683 handle_pte_fault+0x119a/0x7130 mm/memory.c:5396 __handle_mm_fault mm/memory.c:5523 [inline] handle_mm_fault+0x10df/0x1ba0 mm/memory.c:5688 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 other info that might help us debug this: Chain exists of: lock#10 --> &sighand->siglock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&sighand->siglock); lock(&rq->__lock); lock(lock#10); *** DEADLOCK *** 4 locks held by syz-executor.1/7287: #0: ffff88804d3f5070 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:678 [inline] #0: ffff88804d3f5070 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x6e0 mm/memory.c:5844 #1: ffff8880b953e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline] #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2444 #3: ffff88802d3aa798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #3: ffff88802d3aa798 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0x237/0x9d0 kernel/bpf/stackmap.c:141 stack backtrace: CPU: 1 PID: 7287 Comm: syz-executor.1 Not tainted 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] __mmap_lock_do_trace_acquire_returned+0xa8/0x630 mm/mmap_lock.c:237 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline] mmap_read_trylock include/linux/mmap_lock.h:164 [inline] stack_map_get_build_id_offset+0x9af/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+0x42/0x46 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 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+0x1066/0x4a20 kernel/sched/core.c:6745 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:try_charge_memcg+0x52c/0x1840 mm/memcontrol.c:2905 Code: 15 41 f7 c4 00 02 00 00 75 1a 80 7c 24 60 00 75 1f e9 94 0f 00 00 e8 93 dc 81 09 41 f7 c4 00 02 00 00 74 e6 fb 80 7c 24 60 00 <0f> 84 7a 0f 00 00 e9 67 0d 00 00 44 8b 74 24 10 48 8b bc 24 b0 00 RSP: 0000:ffffc90004e6f440 EFLAGS: 00000246 RAX: 791645b400d0ab00 RBX: 1ffff920009cdeb6 RCX: ffffffff8172d78a RDX: dffffc0000000000 RSI: ffffffff8bcabb80 RDI: ffffc90004e6f5b0 RBP: ffffc90004e6f698 R08: ffffffff92fab61f R09: 1ffffffff25f56c3 R10: dffffc0000000000 R11: fffffbfff25f56c4 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b9539440 R15: ffffc90004e6f5f0 try_charge mm/memcontrol.c:3092 [inline] charge_memcg+0xa2/0x160 mm/memcontrol.c:7497 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:7512 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] folio_prealloc+0x52/0x170 mm/memory.c:1056 wp_page_copy mm/memory.c:3291 [inline] do_wp_page+0x11cc/0x5310 mm/memory.c:3683 handle_pte_fault+0x119a/0x7130 mm/memory.c:5396 __handle_mm_fault mm/memory.c:5523 [inline] handle_mm_fault+0x10df/0x1ba0 mm/memory.c:5688 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f6b04a592e3 Code: Unable to access opcode bytes at 0x7f6b04a592b9. RSP: 002b:00007ffd795f3c10 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007f6b04b87660 RCX: 00007f6b04a79ed3 RDX: 000000000000005d RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007f6b04b87660 R08: 0000000000000000 R09: 0000000000000000 R10: 000055556b523750 R11: 0000000000000246 R12: 0000000000000000 R13: ffffffffffffffb0 R14: 0000000000000006 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 15 41 f7 c4 00 adc $0xc4f741,%eax 5: 02 00 add (%rax),%al 7: 00 75 1a add %dh,0x1a(%rbp) a: 80 7c 24 60 00 cmpb $0x0,0x60(%rsp) f: 75 1f jne 0x30 11: e9 94 0f 00 00 jmp 0xfaa 16: e8 93 dc 81 09 call 0x981dcae 1b: 41 f7 c4 00 02 00 00 test $0x200,%r12d 22: 74 e6 je 0xa 24: fb sti 25: 80 7c 24 60 00 cmpb $0x0,0x60(%rsp) * 2a: 0f 84 7a 0f 00 00 je 0xfaa <-- trapping instruction 30: e9 67 0d 00 00 jmp 0xd9c 35: 44 8b 74 24 10 mov 0x10(%rsp),%r14d 3a: 48 rex.W 3b: 8b .byte 0x8b 3c: bc .byte 0xbc 3d: 24 b0 and $0xb0,%al