============================= WARNING: suspicious RCU usage 6.8.0-rc3-syzkaller #0 Not tainted ----------------------------- net/netfilter/ipset/ip_set_hash_gen.h:455 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 8 locks held by syz-executor.1/5096: #0: ffffffff8e1d56b0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:635 [inline] #0: ffffffff8e1d56b0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1685 [inline] #0: ffffffff8e1d56b0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x271/0x21b0 kernel/fork.c:1734 #1: ffff88801532ea20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] #1: ffff88801532ea20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:636 [inline] #1: ffff88801532ea20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1685 [inline] #1: ffff88801532ea20 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm+0x291/0x21b0 kernel/fork.c:1734 #2: ffff888040af3aa0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline] #2: ffff888040af3aa0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:645 [inline] #2: ffff888040af3aa0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1685 [inline] #2: ffff888040af3aa0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm+0x3cb/0x21b0 kernel/fork.c:1734 #3: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #3: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #3: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x82/0x380 mm/pgtable-generic.c:285 #4: ffff88801e756ac8 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff88801e756ac8 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0x1ba/0x300 mm/pgtable-generic.c:373 #5: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #5: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #5: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x82/0x380 mm/pgtable-generic.c:285 #6: ffff8880235bd7f8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1059 [inline] #6: ffff8880235bd7f8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1187 [inline] #6: ffff8880235bd7f8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1224 [inline] #6: ffff8880235bd7f8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1248 [inline] #6: ffff8880235bd7f8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_page_range+0x108a/0x4240 mm/memory.c:1346 #7: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #7: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline] #7: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xcfc/0x1810 kernel/rcu/tree.c:2465 stack backtrace: CPU: 0 PID: 5096 Comm: syz-executor.1 Not tainted 6.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x220/0x340 kernel/locking/lockdep.c:6712 hash_netportnet6_destroy+0xf0/0x2c0 net/netfilter/ipset/ip_set_hash_gen.h:455 ip_set_destroy_set net/netfilter/ipset/ip_set_core.c:1180 [inline] ip_set_destroy_set_rcu+0x6a/0xe0 net/netfilter/ipset/ip_set_core.c:1190 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465 __do_softirq+0x2bb/0x942 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632 irq_exit_rcu+0x9/0x30 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:207 Code: 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 80 58 70 7e 65 8b 15 81 58 70 7e c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 fc 15 00 00 RSP: 0018:ffffc900044673c0 EFLAGS: 00000246 RAX: ffffffff81dc8fb7 RBX: 0000000000000000 RCX: ffff888021ef5940 RDX: 0000000080000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffffd400025e129 R08: ffffffff81dc8fa4 R09: 1ffffd400025e128 R10: dffffc0000000000 R11: fffff9400025e129 R12: ffffea00012f0948 R13: dffffc0000000000 R14: ffffea00012f0940 R15: ffffea00012f0940 arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline] page_fixed_fake_head include/linux/page-flags.h:210 [inline] _compound_head include/linux/page-flags.h:251 [inline] __folio_rmap_sanity_checks+0x137/0x470 include/linux/rmap.h:213 __folio_dup_file_rmap include/linux/rmap.h:321 [inline] folio_dup_file_rmap_ptes include/linux/rmap.h:348 [inline] copy_present_pte mm/memory.c:968 [inline] copy_pte_range mm/memory.c:1102 [inline] copy_pmd_range mm/memory.c:1187 [inline] copy_pud_range mm/memory.c:1224 [inline] copy_p4d_range mm/memory.c:1248 [inline] copy_page_range+0x13b5/0x4240 mm/memory.c:1346 dup_mmap kernel/fork.c:745 [inline] dup_mm kernel/fork.c:1685 [inline] copy_mm+0x12f4/0x21b0 kernel/fork.c:1734 copy_process+0x1d73/0x3fc0 kernel/fork.c:2497 kernel_clone+0x222/0x840 kernel/fork.c:2902 __do_sys_clone kernel/fork.c:3045 [inline] __se_sys_clone kernel/fork.c:3029 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3029 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f13aa87add3 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffd52eff378 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f13aa87add3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 000055555594f750 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 ---------------- Code disassembly (best guess): 0: 0f 1f 00 nopl (%rax) 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: f3 0f 1e fa endbr64 17: 48 8b 04 24 mov (%rsp),%rax 1b: 65 48 8b 0d 80 58 70 mov %gs:0x7e705880(%rip),%rcx # 0x7e7058a3 22: 7e 23: 65 8b 15 81 58 70 7e mov %gs:0x7e705881(%rip),%edx # 0x7e7058ab * 2a: f7 c2 00 01 ff 00 test $0xff0100,%edx <-- trapping instruction 30: 74 11 je 0x43 32: f7 c2 00 01 00 00 test $0x100,%edx 38: 74 35 je 0x6f 3a: 83 .byte 0x83 3b: b9 fc 15 00 00 mov $0x15fc,%ecx