Hello, syzbot found the following issue on:
HEAD commit: 148842c9 Merge tag 'x86-apic-2020-12-14' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10f86c93500000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e26d08f66b19a15 dashboard link: https://syzkaller.appspot.com/bug?extid=7bb955045fc0840decd3 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=110c0613500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7bb955045fc0840de...@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10498 ticks this GP) idle=efa/1/0x4000000000000000 softirq=19185/19191 fqs=5250 (t=10502 jiffies g=23877 q=34) NMI backtrace for cpu 1 CPU: 1 PID: 10164 Comm: syz-executor.0 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 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:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1376 __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:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline] RIP: 0010:lock_acquire+0x2c7/0x740 kernel/locking/lockdep.c:5402 Code: 48 c7 c7 20 68 4b 89 48 83 c4 20 e8 43 fc 8f 07 b8 ff ff ff ff 65 0f c1 05 26 6f ab 7e 83 f8 01 0f 85 36 03 00 00 ff 34 24 9d <e9> 3a fe ff ff 65 ff 05 8d 5d ab 7e 48 8b 05 86 51 82 0b e8 61 f1 RSP: 0018:ffffc90000d90810 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff920001b2104 RCX: 0000000000000001 RDX: 1ffff1100242cb38 RSI: 0000000000000302 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ebb083f R10: fffffbfff1d76107 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880275114b8 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] ieee80211_rx_handlers+0xd7/0xae50 net/mac80211/rx.c:3769 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3834 [inline] ieee80211_prepare_and_rx_handle+0x2482/0x6360 net/mac80211/rx.c:4518 __ieee80211_rx_handle_packet net/mac80211/rx.c:4579 [inline] ieee80211_rx_list+0xdf3/0x23d0 net/mac80211/rx.c:4759 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4780 ieee80211_rx include/net/mac80211.h:4502 [inline] ieee80211_tasklet_handler+0xd3/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 </IRQ> __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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:__tlb_remove_page_size+0x38/0x420 mm/mmu_gather.c:70 Code: 89 fb e8 1b 5b cb ff 48 8d 7b 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5b 03 00 00 48 8b 6b 18 <31> ff 48 89 ee e8 5e 53 cb ff 48 85 ed 0f 84 8b 01 00 00 e8 e0 5a RSP: 0018:ffffc9000a15f760 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc9000a15fa60 RCX: ffffffff81a1cc28 RDX: 1ffff9200142bf4f RSI: ffffffff81a52265 RDI: ffffc9000a15fa78 RBP: ffffffffffffffff R08: 0000000000000000 R09: ffffea0000cc0047 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880139a30e8 R14: ffffea0000cc0740 R15: 000000000101e000 __tlb_remove_page include/asm-generic/tlb.h:438 [inline] zap_pte_range mm/memory.c:1256 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0xea7/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1081 mmput+0x53/0x60 kernel/fork.c:1102 exit_mm kernel/exit.c:500 [inline] do_exit+0xaa9/0x29f0 kernel/exit.c:810 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x42a/0x1fb0 kernel/signal.c:2792 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460fba Code: Unable to access opcode bytes at RIP 0x460f90. RSP: 002b:00007f178679cc48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: 0000000000000000 RBX: 00000000004cd6bc RCX: 0000000000460fba RDX: 0000000000503b20 RSI: 00007f178679cc50 RDI: 0000000000000001 RBP: 000000000119bf80 R08: 000000000000000e R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff5143dfdf R14: 00007f178679d9c0 R15: 000000000119bf8c --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkal...@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
