INFO: task kcompactd0:29 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:29008 pid: 29 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 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: 2 locks held by systemd/1: 1 lock held by khungtaskd/26: #0: ffffffff8b97d320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by khugepaged/32: 4 locks held by kworker/1:1/38: 1 lock held by kswapd0/261: 1 lock held by kswapd1/262: 3 locks held by kworker/1:1H/1037: 2 locks held by systemd-journal/2960: 2 locks held by systemd-udevd/2972: 2 locks held by systemd-timesyn/3054: 2 locks held by in:imklog/6231: 2 locks held by cron/6229: 1 lock held by syz-fuzzer/6548: 2 locks held by syz-fuzzer/6549: 4 locks held by kworker/1:4/8041: 4 locks held by kworker/1:5/8283: 3 locks held by kworker/0:7/8543: 1 lock held by syz-executor.4/14032: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.14.0-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: 1037 Comm: kworker/1:1H Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_highpri fill_page_cache_func RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline] RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] RIP: 0010:PageActive include/linux/page-flags.h:343 [inline] RIP: 0010:move_pages_to_lru+0xc0c/0x2160 mm/vmscan.c:2206 Code: aa d4 ff 48 8b 1b 31 ff 49 89 dd 41 83 e5 01 4c 89 ee e8 97 b0 d4 ff 4d 85 ed 0f 85 26 0d 00 00 e8 a9 aa d4 ff e8 a4 aa d4 ff <48> 8b 5c 24 10 be 08 00 00 00 48 89 df e8 d2 87 1b 00 48 89 d8 48 RSP: 0018:ffffc90004a9f260 EFLAGS: 00000093 RAX: 0000000000000000 RBX: ffffea0005fe98c8 RCX: 0000000000000000 RDX: ffff88801c3b0080 RSI: ffffffff81a09aac RDI: 0000000000000003 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81a09a99 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: ffffea0005fe9900 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ab7bf1303 CR3: 0000000079612000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_inactive_list mm/vmscan.c:2284 [inline] shrink_list mm/vmscan.c:2508 [inline] shrink_lruvec+0xbc1/0x25b0 mm/vmscan.c:2827 shrink_node_memcgs mm/vmscan.c:3016 [inline] shrink_node+0x858/0x1eb0 mm/vmscan.c:3139 shrink_zones mm/vmscan.c:3342 [inline] do_try_to_free_pages+0x386/0x1480 mm/vmscan.c:3397 try_to_free_pages+0x29f/0x750 mm/vmscan.c:3632 __perform_reclaim mm/page_alloc.c:4590 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4611 [inline] __alloc_pages_slowpath.constprop.0+0x828/0x21b0 mm/page_alloc.c:5015 __alloc_pages+0x412/0x500 mm/page_alloc.c:5386 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2291 __get_free_pages+0x8/0x40 mm/page_alloc.c:5410 fill_page_cache_func+0xad/0x240 kernel/rcu/tree.c:3414 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff 48 8b decl -0x75(%rax) 3: 1b 31 sbb (%rcx),%esi 5: ff 49 89 decl -0x77(%rcx) 8: dd 41 83 fldl -0x7d(%rcx) b: e5 01 in $0x1,%eax d: 4c 89 ee mov %r13,%rsi 10: e8 97 b0 d4 ff callq 0xffd4b0ac 15: 4d 85 ed test %r13,%r13 18: 0f 85 26 0d 00 00 jne 0xd44 1e: e8 a9 aa d4 ff callq 0xffd4aacc 23: e8 a4 aa d4 ff callq 0xffd4aacc * 28: 48 8b 5c 24 10 mov 0x10(%rsp),%rbx <-- trapping instruction 2d: be 08 00 00 00 mov $0x8,%esi 32: 48 89 df mov %rbx,%rdi 35: e8 d2 87 1b 00 callq 0x1b880c 3a: 48 89 d8 mov %rbx,%rax 3d: 48 rex.W