======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc4-syzkaller-00161-gae90f6a6170d #0 Not tainted
------------------------------------------------------
syz.9.1400/11213 is trying to acquire lock:
ffff8880b8629430 (krc.lock){-.-.}-{2:2}, at: krc_this_cpu_lock kernel/rcu/tree.c:3312 [inline]
ffff8880b8629430 (krc.lock){-.-.}-{2:2}, at: add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3725 [inline]
ffff8880b8629430 (krc.lock){-.-.}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3811
but task is already holding lock:
ffff8880b862c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1695 [inline]
ffff8880b862c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x670/0xd50 kernel/time/hrtimer.c:1755
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (hrtimer_bases.lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:175 [inline]
hrtimer_start_range_ns+0x109/0xca0 kernel/time/hrtimer.c:1300
hrtimer_start include/linux/hrtimer.h:275 [inline]
run_page_cache_worker kernel/rcu/tree.c:3707 [inline]
kvfree_call_rcu+0x5e6/0x790 kernel/rcu/tree.c:3813
pwq_release_workfn+0x664/0x800 kernel/workqueue.c:5078
kthread_worker_fn+0x500/0xb70 kernel/kthread.c:844
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 (krc.lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
krc_this_cpu_lock kernel/rcu/tree.c:3312 [inline]
add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3725 [inline]
kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3811
trie_delete_elem+0x546/0x6a0 kernel/bpf/lpm_trie.c:540
bpf_prog_2c29ac5cdc6b1842+0x43/0x47
bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2316 [inline]
bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2357
trace_hrtimer_start include/trace/events/timer.h:222 [inline]
debug_activate kernel/time/hrtimer.c:479 [inline]
enqueue_hrtimer+0x35a/0x3c0 kernel/time/hrtimer.c:1085
__run_hrtimer kernel/time/hrtimer.c:1708 [inline]
__hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1755
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
__tlb_remove_folio_pages+0x0/0x30
zap_present_folio_ptes mm/memory.c:1525 [inline]
zap_present_ptes mm/memory.c:1579 [inline]
zap_pte_range mm/memory.c:1621 [inline]
zap_pmd_range mm/memory.c:1739 [inline]
zap_pud_range mm/memory.c:1768 [inline]
zap_p4d_range mm/memory.c:1789 [inline]
unmap_page_range+0x1aca/0x40e0 mm/memory.c:1810
unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900
exit_mmap+0x275/0xc40 mm/mmap.c:1874
__mmput+0x115/0x390 kernel/fork.c:1347
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x28e0 kernel/exit.c:926
do_group_exit+0x207/0x2c0 kernel/exit.c:1088
get_signal+0x16a3/0x1740 kernel/signal.c:2917
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(hrtimer_bases.lock);
lock(krc.lock);
lock(hrtimer_bases.lock);
lock(krc.lock);
*** DEADLOCK ***
5 locks held by syz.9.1400/11213:
#0: ffff888012276a18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline]
#0: ffff888012276a18 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x165/0xc40 mm/mmap.c:1858
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x82/0x380 mm/pgtable-generic.c:287
#2: ffff888031438b58 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff888031438b58 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0x1ba/0x300 mm/pgtable-generic.c:375
#3: ffff8880b862c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1695 [inline]
#3: ffff8880b862c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x670/0xd50 kernel/time/hrtimer.c:1755
#4: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#4: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#4: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2315 [inline]
#4: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2357
stack backtrace:
CPU: 0 UID: 0 PID: 11213 Comm: syz.9.1400 Not tainted 6.12.0-rc4-syzkaller-00161-gae90f6a6170d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
krc_this_cpu_lock kernel/rcu/tree.c:3312 [inline]
add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3725 [inline]
kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3811
trie_delete_elem+0x546/0x6a0 kernel/bpf/lpm_trie.c:540
bpf_prog_2c29ac5cdc6b1842+0x43/0x47
bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2316 [inline]
bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2357
trace_hrtimer_start include/trace/events/timer.h:222 [inline]
debug_activate kernel/time/hrtimer.c:479 [inline]
enqueue_hrtimer+0x35a/0x3c0 kernel/time/hrtimer.c:1085
__run_hrtimer kernel/time/hrtimer.c:1708 [inline]
__hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1755
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__tlb_remove_folio_pages+0x0/0x30 mm/mmu_gather.c:207
Code: 38 c1 0f 8c a1 fd ff ff 4c 89 ef e8 0a b9 15 00 e9 94 fd ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 41 57 41 56 53 41 89 ce 41 89 d7 48 89 f3 48 89 fd
RSP: 0018:ffffc90004e372f8 EFLAGS: 00000293
RAX: ffffffff81e294f2 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffea0000edc700 RDI: ffffc90004e37840
RBP: ffffc90004e37610 R08: ffffffff81e294e5 R09: 1ffffd40001db8e6
R10: dffffc0000000000 R11: fffff940001db8e7 R12: 0000000000000000
R13: 00007f1779e00000 R14: ffffc90004e37560 R15: 800000003b71c007
zap_present_folio_ptes mm/memory.c:1525 [inline]
zap_present_ptes mm/memory.c:1579 [inline]
zap_pte_range mm/memory.c:1621 [inline]
zap_pmd_range mm/memory.c:1739 [inline]
zap_pud_range mm/memory.c:1768 [inline]
zap_p4d_range mm/memory.c:1789 [inline]
unmap_page_range+0x1aca/0x40e0 mm/memory.c:1810
unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900
exit_mmap+0x275/0xc40 mm/mmap.c:1874
__mmput+0x115/0x390 kernel/fork.c:1347
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x28e0 kernel/exit.c:926
do_group_exit+0x207/0x2c0 kernel/exit.c:1088
get_signal+0x16a3/0x1740 kernel/signal.c:2917
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f177b77e719
Code: Unable to access opcode bytes at 0x7f177b77e6ef.
RSP: 002b:00007f177c568038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000014 RBX: 00007f177b935f80 RCX: 00007f177b77e719
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000007
RBP: 00007f177b7f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f177b935f80 R15: 00007ffd54da3828
----------------
Code disassembly (best guess):
0: 38 c1 cmp %al,%cl
2: 0f 8c a1 fd ff ff jl 0xfffffda9
8: 4c 89 ef mov %r13,%rdi
b: e8 0a b9 15 00 call 0x15b91a
10: e9 94 fd ff ff jmp 0xfffffda9
15: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 90 nop
29: 90 nop
* 2a: 66 0f 1f 00 nopw (%rax) <-- trapping instruction
2e: 55 push %rbp
2f: 41 57 push %r15
31: 41 56 push %r14
33: 53 push %rbx
34: 41 89 ce mov %ecx,%r14d
37: 41 89 d7 mov %edx,%r15d
3a: 48 89 f3 mov %rsi,%rbx
3d: 48 89 fd mov %rdi,%rbp