INFO: task kcompactd0:1622 blocked for more than 143 seconds. Not tainted 5.12.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:25680 pid: 1622 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0xa4d/0xf80 kernel/sched/core.c:5073 schedule+0x14b/0x200 kernel/sched/core.c:5152 io_schedule+0x83/0x100 kernel/sched/core.c:7209 wait_on_page_bit_common+0x97a/0x1030 mm/filemap.c:1274 lock_page include/linux/pagemap.h:610 [inline] __unmap_and_move+0x924/0xca0 mm/migrate.c:1050 unmap_and_move+0x29f/0xd10 mm/migrate.c:1200 migrate_pages+0x502/0x16f0 mm/migrate.c:1472 compact_zone+0x2bdc/0x3d50 mm/compaction.c:2365 kcompactd_do_work mm/compaction.c:2775 [inline] kcompactd+0x8df/0x26c0 mm/compaction.c:2870 kthread+0x39a/0x3c0 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: 1 lock held by khungtaskd/1618: #0: ffffffff8cd10280 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by kswapd0/2115: 1 lock held by kswapd1/2116: 1 lock held by systemd-journal/4811: 1 lock held by systemd-timesyn/4904: 1 lock held by cron/8022: 1 lock held by in:imklog/8056: #0: ffff88801ba3c370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 4 locks held by rs:main Q:Reg/8058: 2 locks held by syz-fuzzer/8353: 2 locks held by syz-executor.2/10300: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1618 Comm: khungtaskd Not tainted 5.12.0-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:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 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: 4811 Comm: systemd-journal Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:hlock_class kernel/locking/lockdep.c:198 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4599 [inline] RIP: 0010:__lock_acquire+0x8a6/0x6040 kernel/locking/lockdep.c:4851 Code: f8 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 3c 01 00 00 41 8b 1f 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 80 95 cc 8f 08 00 00 00 e8 a0 94 64 00 48 0f a3 1d 88 1c 6c 0e 72 36 49 b8 RSP: 0018:ffffc9000180dc40 EFLAGS: 00000002 RAX: 0000000000000004 RBX: 0000000000000112 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fcc95a0 RBP: ffffc9000180dfd0 R08: dffffc0000000000 R09: fffffbfff1f992c3 R10: fffffbfff1f992c3 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000001 R14: 0000000000000001 R15: ffff888026f25ef8 FS: 00007f6fea2898c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde140230c8 CR3: 0000000026d92000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:656 [inline] page_evictable+0x23/0x290 mm/internal.h:83 move_pages_to_lru+0x38e/0x1b50 mm/vmscan.c:1832 shrink_inactive_list+0x42e/0xab0 mm/vmscan.c:1951 shrink_list mm/vmscan.c:2170 [inline] shrink_lruvec+0x479/0xa10 mm/vmscan.c:2465 shrink_node_memcgs+0x358/0x700 mm/vmscan.c:2653 shrink_node+0xd19/0x1cb0 mm/vmscan.c:2770 shrink_zones+0x46a/0x9c0 mm/vmscan.c:2973 do_try_to_free_pages+0x205/0xa30 mm/vmscan.c:3028 try_to_free_pages+0x3d3/0xc20 mm/vmscan.c:3267 __perform_reclaim mm/page_alloc.c:4385 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4406 [inline] __alloc_pages_slowpath+0x1041/0x2540 mm/page_alloc.c:4810 __alloc_pages_nodemask+0x3dc/0x5a0 mm/page_alloc.c:5020 alloc_pages include/linux/gfp.h:561 [inline] __page_cache_alloc+0x79/0x1c0 mm/filemap.c:978 pagecache_get_page+0x85e/0xf70 mm/filemap.c:1797 find_or_create_page include/linux/pagemap.h:405 [inline] grow_dev_page+0xba/0x6f0 fs/buffer.c:974 grow_buffers fs/buffer.c:1043 [inline] __getblk_slow fs/buffer.c:1070 [inline] __getblk_gfp+0x1e5/0x320 fs/buffer.c:1354 sb_getblk include/linux/buffer_head.h:325 [inline] ext4_getblk+0x253/0x6c0 fs/ext4/inode.c:855 ext4_bread_batch+0x62/0x590 fs/ext4/inode.c:921 __ext4_find_entry+0xe5d/0x1880 fs/ext4/namei.c:1522 ext4_lookup_entry fs/ext4/namei.c:1623 [inline] ext4_lookup+0x3be/0xd20 fs/ext4/namei.c:1691 __lookup_slow+0x266/0x3c0 fs/namei.c:1630 lookup_slow fs/namei.c:1647 [inline] walk_component+0x4d6/0x740 fs/namei.c:1943 link_path_walk+0x687/0xcf0 fs/namei.c:2266 path_parentat fs/namei.c:2474 [inline] filename_parentat+0x220/0x1170 fs/namei.c:2496 filename_create+0xbf/0x700 fs/namei.c:3581 user_path_create fs/namei.c:3656 [inline] do_mkdirat+0xaf/0x3e0 fs/namei.c:3834 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6fe9544687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe0ca8ba78 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffe0ca8e990 RCX: 00007f6fe9544687 RDX: 00007f6fe9fb5a00 RSI: 00000000000001ed RDI: 00005569b3f638a0 RBP: 00007ffe0ca8bab0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe0ca8e990 R15: 00007ffe0ca8bfa0