------------[ cut here ]------------ WARNING: CPU: 0 PID: 44 at kernel/rcu/tree_stall.h:898 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:890 Modules linked in: CPU: 0 PID: 44 Comm: kcompactd0 Not tainted 5.17.0-rc3-syzkaller-00043-gf4bc5bbb5fef #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:898 Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 c0 38 51 90 e8 9e 48 5b 00 b8 01 00 00 00 87 05 f3 03 ee 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 40 a7 b8 8b 48 c7 c3 6c be 93 8d 74 58 48 b8 00 00 RSP: 0018:ffffc90000007e40 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000100030c52 RCX: ffffffff816334c2 RDX: fffffbfff20a2718 RSI: 0000000000000004 RDI: ffffffff905138c0 RBP: ffffffff8bb8a740 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff20a2718 R11: 0000000000000001 R12: 1ffffffff1701e30 R13: 0000000000000246 R14: ffff88802ca3ab92 R15: 000000000000000a FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555585f848 CR3: 000000005603b000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_check_gp_start_stall kernel/rcu/tree_stall.h:861 [inline] rcu_core+0x4e6/0x1540 kernel/rcu/tree.c:2773 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_many_cond+0x447/0xc90 kernel/smp.c:969 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 cb 8b 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 95 06 00 00 8b 43 08 31 RSP: 0018:ffffc900008c7698 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff88802cc3df40 RCX: 0000000000000000 RDX: ffff888014268000 RSI: ffffffff816c2275 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816c229b R11: 0000000000000000 R12: ffffed1005987be9 R13: 0000000000000002 R14: ffff88802cc3df48 R15: 0000000000000001 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135 __buffer_migrate_page+0x852/0xa80 mm/migrate.c:706 move_to_new_page+0x339/0xf00 mm/migrate.c:873 __unmap_and_move mm/migrate.c:1038 [inline] unmap_and_move mm/migrate.c:1105 [inline] migrate_pages+0x2b8e/0x3e90 mm/migrate.c:1388 compact_zone+0x1ada/0x3850 mm/compaction.c:2400 proactive_compact_node+0x103/0x1c0 mm/compaction.c:2654 kcompactd+0x5b4/0xf30 mm/compaction.c:2964 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 0b 00 or (%rax),%eax 2: 85 ed test %ebp,%ebp 4: 74 4d je 0x53 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 4d 89 f4 mov %r14,%r12 13: 4c 89 f5 mov %r14,%rbp 16: 49 c1 ec 03 shr $0x3,%r12 1a: 83 e5 07 and $0x7,%ebp 1d: 49 01 c4 add %rax,%r12 20: 83 c5 03 add $0x3,%ebp 23: e8 cb 8b 0b 00 callq 0xb8bf3 28: f3 90 pause * 2a: 41 0f b6 04 24 movzbl (%r12),%eax <-- trapping instruction 2f: 40 38 c5 cmp %al,%bpl 32: 7c 08 jl 0x3c 34: 84 c0 test %al,%al 36: 0f 85 95 06 00 00 jne 0x6d1 3c: 8b 43 08 mov 0x8(%rbx),%eax 3f: 31 .byte 0x31