INFO: task kcompactd0:1180 blocked for more than 143 seconds. Not tainted 5.9.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:28760 pid: 1180 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 io_schedule+0xb5/0x120 kernel/sched/core.c:6296 wait_on_page_bit_common+0x32a/0xe30 mm/filemap.c:1253 lock_page include/linux/pagemap.h:548 [inline] __unmap_and_move mm/migrate.c:1047 [inline] unmap_and_move mm/migrate.c:1197 [inline] migrate_pages+0x753/0x30f0 mm/migrate.c:1458 compact_zone+0x1b13/0x3a20 mm/compaction.c:2315 kcompactd_do_work+0x2c7/0x790 mm/compaction.c:2725 kcompactd+0x25d/0xd50 mm/compaction.c:2820 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by systemd/1: 3 locks held by kworker/1:1/23: #0: ffff8880ae535e18 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880ae535e18 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x287/0x2280 kernel/sched/core.c:4445 #1: ffff8880ae520ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffff8880ae525490 (krc.lock){..-.}-{2:2}, at: kfree_rcu_monitor+0x15/0x80 kernel/rcu/tree.c:3288 1 lock held by khungtaskd/1176: #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5852 1 lock held by khugepaged/1183: 1 lock held by kswapd0/1696: 1 lock held by kswapd1/1697: 1 lock held by systemd-journal/3915: 2 locks held by systemd-timesyn/4101: 2 locks held by cron/6557: 3 locks held by in:imklog/6579: 5 locks held by rs:main Q:Reg/6584: 1 lock held by syz-fuzzer/6881: 2 locks held by syz-fuzzer/6893: 2 locks held by syz-fuzzer/6894: 4 locks held by kworker/u4:7/10026: 2 locks held by kworker/u4:8/10028: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1176 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3915 Comm: systemd-journal Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline] RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:111 [inline] RIP: 0010:PageActive include/linux/page-flags.h:329 [inline] RIP: 0010:page_lru include/linux/mm_inline.h:123 [inline] RIP: 0010:move_pages_to_lru.isra.0+0xd58/0x19d0 mm/vmscan.c:1863 Code: 4c 89 ee e8 fa db d8 ff 4d 85 ed 0f 85 4e 06 00 00 e8 6c df d8 ff be 08 00 00 00 48 89 df e8 2f 8a 19 00 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a9 0a 00 00 48 8b 1b 31 ff 48 c1 eb 05 83 e3 RSP: 0018:ffffc90001277150 EFLAGS: 00000802 RAX: 1ffffd4000a05e80 RBX: ffffea000502f400 RCX: ffffffff819d5fb1 RDX: fffff94000a05e81 RSI: 0000000000000008 RDI: ffffea000502f400 RBP: ffffea000502f400 R08: 0000000000000000 R09: ffffea000502f407 R10: fffff94000a05e80 R11: 0000000000000000 R12: ffffc900012772f0 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffea000502f408 FS: 00007fa85ddee8c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb1a4031070 CR3: 000000009294e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_inactive_list+0x38d/0xd40 mm/vmscan.c:1963 shrink_list mm/vmscan.c:2168 [inline] shrink_lruvec+0x61b/0x11b0 mm/vmscan.c:2463 shrink_node_memcgs mm/vmscan.c:2651 [inline] shrink_node+0x839/0x1d60 mm/vmscan.c:2768 shrink_zones mm/vmscan.c:2971 [inline] do_try_to_free_pages+0x38b/0x1440 mm/vmscan.c:3026 try_to_free_pages+0x29e/0x7d0 mm/vmscan.c:3265 __perform_reclaim mm/page_alloc.c:4273 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4294 [inline] __alloc_pages_slowpath.constprop.0+0x995/0x28c0 mm/page_alloc.c:4698 __alloc_pages_nodemask+0x62c/0x790 mm/page_alloc.c:4914 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] kmem_getpages mm/slab.c:1376 [inline] cache_grow_begin+0x71/0x4a0 mm/slab.c:2594 fallback_alloc+0x1fb/0x2e0 mm/slab.c:3141 __do_cache_alloc mm/slab.c:3279 [inline] slab_alloc mm/slab.c:3308 [inline] kmem_cache_alloc+0x2e3/0x3f0 mm/slab.c:3486 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:320 [inline] getname+0x8e/0xd0 fs/namei.c:209 do_sys_openat2+0xf5/0x420 fs/open.c:1162 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fa85d37e840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffc58f4cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc58f4cf80 RCX: 00007fa85d37e840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055b2f31542a0 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055b2f3147040 R14: 00007ffc58f4cf40 R15: 000055b2f3153f50