------------[ cut here ]------------ WARNING: CPU: 1 PID: 612 at kernel/rcu/tree_stall.h:826 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:818 Modules linked in: CPU: 1 PID: 612 Comm: syz-executor.5 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:826 Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 e0 34 20 90 e8 9e 9c 59 00 b8 01 00 00 00 87 05 93 a2 be 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 46 98 8b 48 c7 c3 0c 3e 6b 8d 74 58 48 b8 00 00 RSP: 0018:ffffc90000dc0e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000100046fc6 RCX: ffffffff81619242 RDX: fffffbfff204069c RSI: 0000000000000004 RDI: ffffffff902034e0 RBP: ffffffff8b9846c0 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff204069c R11: 1ffff110173aa536 R12: 1ffffffff16c1e30 R13: 0000000000000246 R14: ffff8880b9d528d2 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c029000 CR3: 0000000054a27000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_check_gp_start_stall kernel/rcu/tree_stall.h:789 [inline] rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2788 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:PageMemcgKmem include/linux/memcontrol.h:537 [inline] RIP: 0010:page_memcg include/linux/memcontrol.h:452 [inline] RIP: 0010:lock_page_memcg+0x9f/0x7d0 mm/memcontrol.c:2011 Code: 0b 00 0f 84 9c 04 00 00 0f 1f 44 00 00 49 8d 47 38 48 89 c2 48 89 45 d0 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 f7 04 00 00 49 8b 5f 38 4d 8d 67 08 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc9000170f6f8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 1ffffd400037ff7f RSI: 0000000000000008 RDI: ffffffff8d6b0ad0 RBP: ffffc9000170f740 R08: 0000000000000000 R09: ffffffff8d6b0ad7 R10: fffffbfff1ad615a R11: 0000000000000000 R12: ffffea0001bffbc8 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffea0001bffbc0 page_remove_rmap+0x25/0x1480 mm/rmap.c:1345 zap_pte_range mm/memory.c:1269 [inline] zap_pmd_range mm/memory.c:1384 [inline] zap_pud_range mm/memory.c:1413 [inline] zap_p4d_range mm/memory.c:1434 [inline] unmap_page_range+0xeab/0x2890 mm/memory.c:1455 unmap_single_vma+0x198/0x300 mm/memory.c:1500 unmap_vmas+0x16d/0x2f0 mm/memory.c:1532 exit_mmap+0x1d0/0x620 mm/mmap.c:3202 __mmput+0x122/0x470 kernel/fork.c:1101 mmput+0x58/0x60 kernel/fork.c:1122 exit_mm kernel/exit.c:501 [inline] do_exit+0xae2/0x2a50 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2150 kernel/signal.c:2796 arch_do_signal_or_restart+0x2a9/0x1eb0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: Unable to access opcode bytes at RIP 0x4665af. RSP: 002b:00007f4df008b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000056bf88 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 00007fffccafd4ef R14: 00007f4df008b300 R15: 0000000000022000