INFO: task kcompactd0:30 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:27712 pid: 30 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 wait_on_page_bit_common+0x537/0xe60 mm/filemap.c:1356 lock_page include/linux/pagemap.h:625 [inline] __unmap_and_move mm/migrate.c:987 [inline] unmap_and_move mm/migrate.c:1211 [inline] migrate_pages+0xa6d/0x39e0 mm/migrate.c:1488 compact_zone+0x1abb/0x3860 mm/compaction.c:2393 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2833 kcompactd+0x86d/0xf30 mm/compaction.c:2935 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97f120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6230: #0: ffff88801d9c4630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 1 lock held by syz-executor.0/12093: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12093 Comm: syz-executor.0 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_acquire+0xff/0x510 kernel/locking/lockdep.c:5598 Code: 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 b1 03 00 00 8b 0d 7d 1c 13 0c <85> c9 0f 84 de 00 00 00 65 8b 05 02 97 a6 7e 85 c0 0f 85 14 01 00 RSP: 0018:ffffc90000fd8e28 EFLAGS: 00000046 RAX: 0000000000000007 RBX: 1ffff920001fb1c7 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000010002 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffff8880b9d32a8b R10: ffffed10173a6551 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880b9d223d8 R15: 0000000000000000 FS: 00005555560cb400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c012eef410 CR3: 000000008d324000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 hrtimer_interrupt+0x38e/0x790 kernel/time/hrtimer.c:1842 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:stack_trace_consume_entry+0x7a/0x160 kernel/stacktrace.c:88 Code: 0f 8e a5 00 00 00 31 c0 3b 6b 08 0f 83 81 00 00 00 48 8d 7b 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 90 00 00 00 8b RSP: 0018:ffffc90002dd7468 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: ffffc90002dd7540 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81c42c91 RDI: ffffc90002dd754c RBP: 0000000000000000 R08: ffffffff8decb28a R09: 0000000000000001 R10: fffff520005bae9c R11: 0000000000086089 R12: ffffc90002dd7540 R13: 0000000000000000 R14: ffff8880865862c0 R15: 0000000000000000 arch_stack_walk+0x6d/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 save_stack+0x151/0x1e0 mm/page_owner.c:119 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 __page_cache_alloc mm/filemap.c:1022 [inline] __page_cache_alloc+0x303/0x3a0 mm/filemap.c:1007 page_cache_ra_unbounded+0x363/0x950 mm/readahead.c:216 do_page_cache_ra+0xf9/0x140 mm/readahead.c:269 do_sync_mmap_readahead mm/filemap.c:2981 [inline] filemap_fault+0x15fe/0x27a0 mm/filemap.c:3074 __do_fault+0x10d/0x4e0 mm/memory.c:3858 do_cow_fault mm/memory.c:4202 [inline] do_fault mm/memory.c:4303 [inline] handle_pte_fault mm/memory.c:4559 [inline] __handle_mm_fault+0x2e51/0x5320 mm/memory.c:4694 handle_mm_fault+0x1c8/0x790 mm/memory.c:4792 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x7f7652104dc9 Code: 48 8b 04 24 48 85 c0 74 17 48 8b 54 24 18 48 0f ca 48 89 54 24 18 48 83 f8 01 0f 85 9b 02 00 00 48 8b 44 24 10 48 8b 54 24 18 <48> 89 10 e9 c2 fd ff ff 48 8b 44 24 10 0f b7 10 48 8b 04 24 48 85 RSP: 002b:00007ffd033575b0 EFLAGS: 00010246 RAX: 0000000020000040 RBX: 00007f765266b000 RCX: 0000000000000000 RDX: 000000000000003f RSI: 0000000000000000 RDI: 00005555560cb2f0 RBP: 00007ffd033576a8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 000000007951f05e R12: 00000000001a75bc R13: 00000000000003e8 R14: 00007f7652266f60 R15: 00000000001a7280 ---------------- Code disassembly (best guess), 6 bytes skipped: 0: df 48 89 fisttps -0x77(%rax) 3: c1 83 e0 07 48 c1 e9 roll $0xe9,-0x3eb7f820(%rbx) a: 03 83 c0 03 0f b6 add -0x49f0fc40(%rbx),%eax 10: 14 11 adc $0x11,%al 12: 38 d0 cmp %dl,%al 14: 7c 08 jl 0x1e 16: 84 d2 test %dl,%dl 18: 0f 85 b1 03 00 00 jne 0x3cf 1e: 8b 0d 7d 1c 13 0c mov 0xc131c7d(%rip),%ecx # 0xc131ca1 * 24: 85 c9 test %ecx,%ecx <-- trapping instruction 26: 0f 84 de 00 00 00 je 0x10a 2c: 65 8b 05 02 97 a6 7e mov %gs:0x7ea69702(%rip),%eax # 0x7ea69735 33: 85 c0 test %eax,%eax 35: 0f .byte 0xf 36: 85 14 01 test %edx,(%rcx,%rax,1)