------------[ cut here ]------------ WARNING: CPU: 1 PID: 10170 at kernel/rcu/tree_stall.h:894 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:886 Modules linked in: CPU: 1 PID: 10170 Comm: syz-executor.5 Not tainted 5.14.0-rc7-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:894 Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 a0 55 22 90 e8 2e 39 5a 00 b8 01 00 00 00 87 05 23 a8 c0 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 50 98 8b 48 c7 c3 6c b5 6c 8d 74 58 48 b8 00 00 RSP: 0018:ffffc90000dc0e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000100045374 RCX: ffffffff8161ad72 RDX: fffffbfff2044ab4 RSI: 0000000000000004 RDI: ffffffff902255a0 RBP: ffffffff8b9850c0 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff2044ab4 R11: 1ffff110173aa54e R12: 1ffffffff16c1e30 R13: 0000000000000246 R14: ffff8880b9d52992 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 000000004033b000 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:857 [inline] rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2780 __do_softirq+0x29b/0x9c2 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:zap_pte_range mm/memory.c:1325 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline] RIP: 0010:zap_pud_range mm/memory.c:1510 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline] RIP: 0010:unmap_page_range+0xa8b/0x2a10 mm/memory.c:1552 Code: 4c 39 fb 0f 84 a2 0f 00 00 49 89 c7 49 8d 87 00 f0 ff ff 48 89 44 24 08 e8 72 89 cb ff 48 8b 04 24 48 c1 e8 03 42 80 3c 30 00 <0f> 85 04 1a 00 00 48 8b 04 24 31 ff 4c 8b 20 4c 89 e3 48 83 e3 9f RSP: 0018:ffffc90001ee77b0 EFLAGS: 00000246 RAX: 1ffff11010534100 RBX: 00007f3e46200000 RCX: 0000000000000000 RDX: ffff8880671e54c0 RSI: ffffffff81aa1f7e RDI: 0000000000000003 RBP: ffffea0001921740 R08: 00007f3e46200000 R09: 0000000000000000 R10: ffffffff81aa1f5a R11: 0000000000000000 R12: ffffea0001921770 R13: 0000000000000000 R14: dffffc0000000000 R15: 00007f3e46101000 unmap_single_vma+0x198/0x300 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x620 mm/mmap.c:3201 __mmput+0x122/0x470 kernel/fork.c:1101 mmput+0x58/0x60 kernel/fork.c:1122 exit_mm kernel/exit.c:501 [inline] do_exit+0xae2/0x2a60 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2808 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 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: 0033:0x4665f9 Code: Unable to access opcode bytes at RIP 0x4665cf. RSP: 002b:00007f3e43e8f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000020000680 RSI: 00000000c004743e RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff1136bdef R14: 00007f3e43e8f300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 4c 39 fb cmp %r15,%rbx 3: 0f 84 a2 0f 00 00 je 0xfab 9: 49 89 c7 mov %rax,%r15 c: 49 8d 87 00 f0 ff ff lea -0x1000(%r15),%rax 13: 48 89 44 24 08 mov %rax,0x8(%rsp) 18: e8 72 89 cb ff callq 0xffcb898f 1d: 48 8b 04 24 mov (%rsp),%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) * 2a: 0f 85 04 1a 00 00 jne 0x1a34 <-- trapping instruction 30: 48 8b 04 24 mov (%rsp),%rax 34: 31 ff xor %edi,%edi 36: 4c 8b 20 mov (%rax),%r12 39: 4c 89 e3 mov %r12,%rbx 3c: 48 83 e3 9f and $0xffffffffffffff9f,%rbx