rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=dde/1/0x4000000000000000 softirq=54924/54924 fqs=4687 (t=10500 jiffies g=76597 q=214145) NMI backtrace for cpu 1 CPU: 1 PID: 24679 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:118 [inline] RIP: 0010:rcu_read_lock_sched_held+0x2/0x70 kernel/rcu/update.c:121 Code: 49 c1 ec 09 49 83 f4 01 41 83 e4 01 44 89 e0 41 5c c3 45 31 e4 44 89 e0 41 5c c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 <41> bc 01 00 00 00 e8 e3 58 89 07 85 c0 75 06 44 89 e0 41 5c c3 e8 RSP: 0018:ffffc90000d90d38 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000101 RCX: ffffffff815fa240 RDX: ffff888065e2b480 RSI: ffffffff815fa35c RDI: 0000000000000001 RBP: ffffc90000d90d80 R08: 0000000000000000 R09: ffffffff8cecaacf R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880526d8b60 R13: 1ffff920001b21aa R14: ffffffff876ceac0 R15: 0000000000000000 trace_timer_expire_entry include/trace/events/timer.h:90 [inline] call_timer_fn+0x601/0x6b0 kernel/time/timer.c:1409 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:163 [inline] RIP: 0010:unwind_next_frame+0x238/0x1f90 arch/x86/kernel/unwind_orc.c:443 Code: ff 39 d6 0f 83 54 12 00 00 48 ba 00 00 00 00 00 fc ff df 41 89 f0 4a 8d 3c 85 f0 ea fa 8d 49 89 f9 49 c1 e9 03 45 0f b6 0c 11 <48> 89 fa 83 e2 07 83 c2 03 44 38 ca 7c 32 45 84 c9 74 2d 4c 89 44 RSP: 0018:ffffc90002d0f418 EFLAGS: 00000212 RAX: 0000000000000000 RBX: 1ffff920005a1e8b RCX: ffffffff814504d9 RDX: dffffc0000000000 RSI: 0000000000004504 RDI: ffffffff8dfbff00 RBP: 0000000000000001 R08: 0000000000004504 R09: 0000000000000000 R10: 0000000000082081 R11: 0000000000000001 R12: ffffc90002d0f538 R13: ffffc90002d0f525 R14: ffffc90002d0f540 R15: ffffc90002d0f4f0 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 pgtable_pte_page_dtor include/linux/mm.h:2212 [inline] ___pte_free_tlb+0x19/0x100 arch/x86/mm/pgtable.c:55 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte_range mm/memory.c:220 [inline] free_pmd_range mm/memory.c:238 [inline] free_pud_range mm/memory.c:272 [inline] free_p4d_range mm/memory.c:306 [inline] free_pgd_range+0x498/0xc00 mm/memory.c:386 free_pgtables+0x230/0x2f0 mm/memory.c:418 exit_mmap+0x2c0/0x530 mm/mmap.c:3223 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Unable to access opcode bytes at RIP 0x45de8f. RSP: 002b:00007f851cfe7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: 0000000000278000 RBX: 000000000002ea00 RCX: 000000000045deb9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 000000000119bf78 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf2c R13: 00007ffc5ed175af R14: 00007f851cfe89c0 R15: 000000000119bf2c