rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=e1a/1/0x4000000000000004 softirq=178766/178766 fqs=5013 rcu: (t=10500 jiffies g=239413 q=10771) NMI backtrace for cpu 0 CPU: 0 PID: 23543 Comm: syz-executor.5 Not tainted 4.19.154-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192 Code: c0 18 80 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d c1 0c dc 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 96 37 2d f9 65 8b 05 9f 6b ec 77 85 c0 74 02 5d RSP: 0018:ffff8880ba007dd0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3003 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88804d936ac4 RBP: ffff8880ba022b00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86a65fc0 R13: ffff8880ba022b00 R14: ffff8880ba007e68 R15: 0000000000000000 expire_timers+0x238/0x4e0 kernel/time/timer.c:1374 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__chk_range_not_ok arch/x86/include/asm/uaccess.h:60 [inline] RIP: 0010:rw_copy_check_uvector+0x1e9/0x340 fs/read_write.c:814 Code: 00 fc ff df 48 8b 44 24 30 4c 8b 75 f8 80 3c 08 00 0f 85 3a 01 00 00 48 8b 44 24 28 48 89 df 48 8b 80 18 14 00 00 48 89 04 24 <31> c0 49 01 de 0f 92 c0 4c 89 f6 48 89 44 24 10 e8 32 51 bf ff 48 RSP: 0018:ffff88822bf67bd8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00007ffffffff000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: ffffffff81a57e7a RDI: 0000000000000000 RBP: ffff88822beb0b18 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000085 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 import_iovec+0xa6/0x3a0 lib/iov_iter.c:1541 vfs_readv+0xbb/0x150 fs/read_write.c:985 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f86c167dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000025e40 RCX: 000000000045deb9 RDX: 0000000000000218 RSI: 00000000200017c0 RDI: 0000000000000003 RBP: 000000000118bf70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffeba91f77f R14: 00007f86c167e9c0 R15: 000000000118bf2c rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=e1a/1/0x4000000000000002 softirq=178765/178766 fqs=5015 rcu: (detected by 1, t=10547 jiffies, g=24989, q=1) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8119 Comm: syz-executor.3 Not tainted 4.19.154-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:314 [inline] RIP: 0010:__lock_acquire+0x84e/0x3ff0 kernel/locking/lockdep.c:3410 Code: 26 00 00 41 32 6a 21 83 e5 60 0f 85 fd 05 00 00 48 89 da 89 d9 48 c1 ea 20 89 d0 41 29 d0 01 da c1 c0 04 44 31 c0 44 8d 04 10 <29> c1 c1 c0 06 48 8b 3c 24 31 c8 89 c1 29 c2 44 01 c0 c1 c1 08 31 RSP: 0018:ffff88809136f470 EFLAGS: 00000082 RAX: 00000000f3a1b732 RBX: 11d862ab0911641d RCX: 000000000911641d RDX: 000000001ae9c6c8 RSI: ffff8880934cc988 RDI: ffff8880934cc9d1 RBP: 0000000000000000 R08: 000000000e8b7dfa R09: 0000000000000001 R10: ffff8880934cc9b0 R11: 0000000000000000 R12: 000000000002002e R13: ffff8880934cc100 R14: ffff8880934cc9c8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003000 CR3: 000000008f700000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] lock_page_memcg+0x36/0x220 mm/memcontrol.c:1908 page_remove_file_rmap+0x36/0xa30 mm/rmap.c:1215 page_remove_rmap+0xe5/0x120 mm/rmap.c:1300 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1452 [inline] zap_pud_range mm/memory.c:1481 [inline] zap_p4d_range mm/memory.c:1502 [inline] unmap_page_range+0x12f6/0x2a70 mm/memory.c:1523 unmap_single_vma+0x198/0x300 mm/memory.c:1568 unmap_vmas+0xa9/0x180 mm/memory.c:1598 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xab5/0x2b70 kernel/exit.c:874 do_group_exit+0x125/0x310 kernel/exit.c:990 get_signal+0x3f2/0x1f70 kernel/signal.c:2588 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x417a5a Code: Bad RIP value. RSP: 002b:00007ffd0e8945c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000001fb8 RCX: 0000000000417a5a RDX: 0000000040000000 RSI: 00007ffd0e8945d4 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 0000000000001fb7 R09: 0000000002020940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000419720 R13: 00007ffd0e894888 R14: 0000000000000000 R15: 0000000000000000