INFO: task kcompactd0:1649 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:29088 pid: 1649 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 io_schedule+0xba/0x130 kernel/sched/core.c:6838 wait_on_page_bit_common+0x424/0xeb0 mm/filemap.c:1273 lock_page include/linux/pagemap.h:611 [inline] __unmap_and_move mm/migrate.c:1043 [inline] unmap_and_move mm/migrate.c:1193 [inline] migrate_pages+0x97b/0x34a0 mm/migrate.c:1459 compact_zone+0x1ccd/0x3be0 mm/compaction.c:2357 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2767 kcompactd+0x25d/0xd00 mm/compaction.c:2862 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Showing all locks held in the system: 2 locks held by systemd/1: 4 locks held by kworker/u4:4/426: 1 lock held by khungtaskd/1646: #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by kswapd1/2183: 5 locks held by kworker/u4:5/3324: 2 locks held by systemd-journal/4878: 1 lock held by systemd-udevd/4884: 1 lock held by in:imklog/8147: #0: ffff8880140478f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 4 locks held by rs:main Q:Reg/8148: 1 lock held by cron/8149: 2 locks held by syz-fuzzer/8457: 2 locks held by syz-fuzzer/8460: 2 locks held by kworker/u4:2/9851: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.11.0-rc3-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+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd43/0xfa0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8149 Comm: cron Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode+0x31/0x40 kernel/kcov.c:175 Code: 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 cc 14 00 00 85 d2 74 0b 8b 86 a8 14 00 00 39 f8 0f 94 c0 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 31 c0 65 8b 15 87 2b RSP: 0018:ffffc9000bb6e7f8 EFLAGS: 00000093 RAX: 0000000000000000 RBX: ffffea0008ac36c8 RCX: ffff888014926300 RDX: 0000000000000000 RSI: ffff888014926300 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff819c835e R11: 0000000000000000 R12: 0000000000000005 R13: dffffc0000000000 R14: ffff88814077c820 R15: 0000000000000000 FS: 00007efdec1a7840(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f653c035198 CR3: 00000000255cd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp1+0x22/0x80 kernel/kcov.c:270 __list_del_entry include/linux/list.h:132 [inline] list_move include/linux/list.h:215 [inline] isolate_lru_pages+0x56e/0x1490 mm/vmscan.c:1699 shrink_inactive_list+0x191/0xca0 mm/vmscan.c:1941 shrink_list mm/vmscan.c:2178 [inline] shrink_lruvec+0x62c/0x11d0 mm/vmscan.c:2473 shrink_node_memcgs mm/vmscan.c:2661 [inline] shrink_node+0x863/0x1de0 mm/vmscan.c:2778 shrink_zones mm/vmscan.c:2981 [inline] do_try_to_free_pages+0x388/0x14b0 mm/vmscan.c:3036 try_to_free_pages+0x29f/0x720 mm/vmscan.c:3275 __perform_reclaim mm/page_alloc.c:4376 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4397 [inline] __alloc_pages_slowpath.constprop.0+0x88e/0x2240 mm/page_alloc.c:4801 __alloc_pages_nodemask+0x5f0/0x730 mm/page_alloc.c:5011 __alloc_pages include/linux/gfp.h:511 [inline] __alloc_pages_node include/linux/gfp.h:524 [inline] kmem_getpages mm/slab.c:1376 [inline] cache_grow_begin+0x71/0x430 mm/slab.c:2593 fallback_alloc+0x1d3/0x2c0 mm/slab.c:3140 __do_cache_alloc mm/slab.c:3278 [inline] slab_alloc mm/slab.c:3307 [inline] kmem_cache_alloc+0x322/0x4c0 mm/slab.c:3486 ext4_alloc_inode+0x1a/0x640 fs/ext4/super.c:1236 alloc_inode+0x61/0x230 fs/inode.c:233 iget_locked+0x1c6/0x730 fs/inode.c:1192 __ext4_iget+0x27c/0x41b0 fs/ext4/inode.c:4628 ext4_lookup fs/ext4/namei.c:1697 [inline] ext4_lookup+0x383/0x730 fs/ext4/namei.c:1672 __lookup_slow+0x24c/0x480 fs/namei.c:1544 lookup_slow fs/namei.c:1561 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 link_path_walk.part.0+0x703/0xc70 fs/namei.c:2186 link_path_walk fs/namei.c:2112 [inline] path_lookupat+0xb7/0x830 fs/namei.c:2335 filename_lookup+0x19f/0x560 fs/namei.c:2369 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x142/0x390 fs/stat.c:185 vfs_fstatat fs/stat.c:207 [inline] vfs_stat include/linux/fs.h:3118 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:349 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7efdeb895295 Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 0f 1f 84 00 00 00 00 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 d1 db 2b 00 f7 d8 64 89 RSP: 002b:00007ffce7771a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00007efdeb91d011 RCX: 00007efdeb895295 RDX: 00007ffce7771a90 RSI: 00007ffce7771a90 RDI: 00007efdeb91d011 RBP: 0000000000000001 R08: 000055c94e7e96f0 R09: 0000000000000020 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000