rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2670 jiffies s: 6529 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7057 Comm: syz.3.681 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x66/0x70 kernel/kcov.c:234 Code: 82 f8 15 00 00 83 f8 02 75 20 48 8b 8a 00 16 00 00 8b 92 fc 15 00 00 48 8b 01 48 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000007248 EFLAGS: 00000006 RAX: 0000000000010104 RBX: ffffc900000072d0 RCX: ffffffff813ce13d RDX: ffff888021193c00 RSI: ffffffff813ce14b RDI: 0000000000000004 RBP: 0000000000000002 R08: 0000000000000004 R09: 0000000000007876 R10: 00000000000a4000 R11: 0000000000000000 R12: ffffffff817876d0 R13: 0000000000007876 R14: 00000000000a4000 R15: ffffc90000007305 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32f0dff8 CR3: 000000000db7c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:217 [inline] unwind_next_frame+0x24b/0x23a0 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 dummy_timer+0x1750/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1981 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline] RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:245 Code: cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 7f 1a 78 7e <65> 8b 05 80 1a 78 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00 RSP: 0018:ffffc90000007b78 EFLAGS: 00000246 RAX: 0019999999999998 RBX: ffff888063cb03e0 RCX: ffffffff892450bc RDX: ffff888021193c00 RSI: 0019999999999998 RDI: 0000000000000007 RBP: ffff888063be4b00 R08: 0000000000000007 R09: 0019999999999998 R10: 0000000000000000 R11: 0000000000000000 R12: 00000015798ee228 R13: 0000000000000000 R14: 0000000225c17d04 R15: 0000000000000000 pie_calculate_probability+0x1fc/0x850 net/sched/sch_pie.c:342 fq_pie_timer+0x215/0x5a0 net/sched/sch_fq_pie.c:398 call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417 __run_timer_base kernel/time/timer.c:2428 [inline] __run_timer_base kernel/time/timer.c:2421 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2437 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2447 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:206 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:238 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:folio_test_head include/linux/page-flags.h:827 [inline] RIP: 0010:folio_test_large include/linux/page-flags.h:848 [inline] RIP: 0010:zap_present_ptes mm/memory.c:1567 [inline] RIP: 0010:zap_pte_range mm/memory.c:1618 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1736 [inline] RIP: 0010:zap_pud_range mm/memory.c:1765 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1786 [inline] RIP: 0010:unmap_page_range+0xfa4/0x3c10 mm/memory.c:1807 Code: 32 1f b9 ff 48 8b 7c 24 40 e8 48 47 ff ff be 08 00 00 00 48 89 c3 48 89 c7 e8 48 e9 17 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 04 28 00 00 48 8b 1b 31 ff 83 e3 40 48 89 de e8 66 21 b9 ff RSP: 0018:ffffc9001744f698 EFLAGS: 00000246 RAX: 1ffffd4000336218 RBX: ffffea00019b10c0 RCX: ffffffff81d2a0d8 RDX: fffff94000336219 RSI: 0000000000000008 RDI: ffffea00019b10c0 RBP: 8000000066c43007 R08: 0000000000000000 R09: fffff94000336218 R10: ffffea00019b10c7 R11: 0000000000000000 R12: 0000000000000007 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc9001744fab8 unmap_single_vma+0x194/0x2b0 mm/memory.c:1853 unmap_vmas+0x22f/0x490 mm/memory.c:1897 exit_mmap+0x1b8/0xb20 mm/mmap.c:3412 __mmput+0x12a/0x480 kernel/fork.c:1345 mmput+0x62/0x70 kernel/fork.c:1367 exit_mm kernel/exit.c:571 [inline] do_exit+0x9bf/0x2bb0 kernel/exit.c:869 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 get_signal+0x25fb/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 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+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f749d179ef9 Code: Unable to access opcode bytes at 0x7f749d179ecf. RSP: 002b:00007f749dff50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f749d315f88 RCX: 00007f749d179ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f749d315f88 RBP: 00007f749d315f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f749d315f8c R13: 0000000000000000 R14: 00007ffc4d88e450 R15: 00007ffc4d88e538