INFO: task kcompactd0:30 blocked for more than 143 seconds. Not tainted 5.15.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:27848 pid: 30 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: 1 lock held by khungtaskd/27: #0: ffffffff8b97fea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by khugepaged/33: 1 lock held by kswapd0/263: 1 lock held by kswapd1/264: 2 locks held by systemd-journal/2957: 1 lock held by in:imklog/6228: #0: ffff88801cfa1c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 1 lock held by syz-executor.2/13350: 1 lock held by systemd-udevd/13356: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc2-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: 263 Comm: kswapd0 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlock_class kernel/locking/lockdep.c:194 [inline] RIP: 0010:mark_lock+0xbc/0x17b0 kernel/locking/lockdep.c:4571 Code: f6 00 00 00 bd 01 00 00 00 44 89 e1 d3 e5 48 63 ed 4d 8d 7d 20 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e 5f 08 00 00 41 0f b7 55 20 66 81 e2 ff 1f RSP: 0018:ffffc9000206f350 EFLAGS: 00000016 RAX: 0000000000000000 RBX: 1ffff9200040de71 RCX: ffffffff815b054d RDX: 1ffff110030b14dd RSI: ffff88801858a6c8 RDI: ffff88801858a6ea RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff8fcfa967 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009 R13: ffff88801858a6c8 R14: ffff88801858a678 R15: ffff88801858a6e8 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558f7804fe70 CR3: 000000000b68e000 CR4: 0000000000350ee0 Call Trace: mark_usage kernel/locking/lockdep.c:4514 [inline] __lock_acquire+0x8a7/0x54a0 kernel/locking/lockdep.c:4969 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] page_evictable+0x38/0x360 mm/internal.h:82 move_pages_to_lru+0x2b3/0x2160 mm/vmscan.c:2165 shrink_inactive_list mm/vmscan.c:2284 [inline] shrink_list mm/vmscan.c:2508 [inline] shrink_lruvec+0xbc8/0x25b0 mm/vmscan.c:2827 shrink_node_memcgs mm/vmscan.c:3016 [inline] shrink_node+0x858/0x1eb0 mm/vmscan.c:3139 kswapd_shrink_node mm/vmscan.c:3878 [inline] balance_pgdat+0x8a0/0x1490 mm/vmscan.c:4069 kswapd+0x5b6/0xdb0 mm/vmscan.c:4328 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: f6 00 00 testb $0x0,(%rax) 3: 00 bd 01 00 00 00 add %bh,0x1(%rbp) 9: 44 89 e1 mov %r12d,%ecx c: d3 e5 shl %cl,%ebp e: 48 63 ed movslq %ebp,%rbp 11: 4d 8d 7d 20 lea 0x20(%r13),%r15 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 4c 89 fa mov %r15,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 74 08 je 0x36 2e: 3c 03 cmp $0x3,%al 30: 0f 8e 5f 08 00 00 jle 0x895 36: 41 0f b7 55 20 movzwl 0x20(%r13),%edx 3b: 66 81 e2 ff 1f and $0x1fff,%dx