INFO: task kcompactd0:30 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:24048 pid: 30 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6250 schedule+0x12b/0x1f0 kernel/sched/core.c:6323 io_schedule+0x83/0x100 kernel/sched/core.c:8368 folio_wait_bit_common+0x8aa/0xe00 mm/filemap.c:1356 lock_page include/linux/pagemap.h:697 [inline] __unmap_and_move+0x9d9/0xda0 mm/migrate.c:986 unmap_and_move+0x321/0xd70 mm/migrate.c:1210 migrate_pages+0x562/0x16f0 mm/migrate.c:1487 compact_zone+0x2d23/0x3d10 mm/compaction.c:2393 proactive_compact_node mm/compaction.c:2647 [inline] kcompactd+0x1c23/0x2920 mm/compaction.c:2957 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Showing all locks held in the system: 1 lock held by systemd/1: 1 lock held by khungtaskd/27: #0: ffffffff8c91d500 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by khugepaged/33: 1 lock held by kswapd0/98: 1 lock held by kswapd1/99: 4 locks held by kworker/1:1H/108: 2 locks held by systemd-journal/2935: 2 locks held by systemd-udevd/2937: 2 locks held by systemd-timesyn/3023: #0: ffff8880185fdf48 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:838 [inline] #0: ffff8880185fdf48 (mapping.invalidate_lock){++++}-{3:3}, at: page_cache_ra_unbounded+0x1ab/0x9b0 mm/readahead.c:194 #1: ffffffff8c9dff68 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x58/0x690 mm/page_alloc.c:3189 2 locks held by in:imklog/6129: 2 locks held by cron/6116: 2 locks held by agetty/6151: #0: ffff888021767098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900028982e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113 2 locks held by syz-fuzzer/6456: 1 lock held by syz-fuzzer/6457: 2 locks held by syz-fuzzer/6459: 3 locks held by kworker/0:6/8421: 1 lock held by syz-executor.4/20144: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc82/0xcd0 kernel/hung_task.c:295 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 108 Comm: kworker/1:1H Not tainted 5.15.0-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:rcu_read_lock_sched_held+0xbb/0x130 kernel/rcu/update.c:126 Code: 00 00 48 c7 04 24 0e 36 e0 45 49 c7 04 1e 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 48 75 6d 44 89 f8 48 8d 65 e0 5b <41> 5c 41 5e 41 5f 5d c3 65 8b 05 2e 5c 94 7e 41 bf 01 00 00 00 a9 RSP: 0000:ffffc90002016a38 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000080000002 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc90002016a50 R08: dffffc0000000000 R09: fffffbfff1bb8fc6 R10: fffffbfff1bb8fc6 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff92000402d5c R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f75b4e39303 CR3: 000000000c68e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_release+0x4f/0x150 include/trace/events/lock.h:58 lock_release+0x82/0x810 kernel/locking/lockdep.c:5636 rcu_read_unlock include/linux/rcupdate.h:721 [inline] page_evictable+0x244/0x290 mm/internal.h:104 move_pages_to_lru+0x374/0x1570 mm/vmscan.c:2166 shrink_inactive_list+0x463/0xad0 mm/vmscan.c:2285 shrink_list mm/vmscan.c:2509 [inline] shrink_lruvec+0x49a/0xc90 mm/vmscan.c:2828 shrink_node_memcgs+0x358/0x700 mm/vmscan.c:3017 shrink_node+0xdd5/0x1ef0 mm/vmscan.c:3140 shrink_zones+0x48d/0x9d0 mm/vmscan.c:3343 do_try_to_free_pages+0x22a/0xce0 mm/vmscan.c:3398 try_to_free_pages+0x3e3/0xc60 mm/vmscan.c:3633 __perform_reclaim mm/page_alloc.c:4594 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4615 [inline] __alloc_pages_slowpath+0x1039/0x25c0 mm/page_alloc.c:5019 __alloc_pages+0x3d0/0x580 mm/page_alloc.c:5394 __get_free_pages+0x8/0x30 mm/page_alloc.c:5430 fill_page_cache_func+0xc4/0x220 kernel/rcu/tree.c:3412 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp) 9: 45 a: 49 c7 04 1e 00 00 00 movq $0x0,(%r14,%rbx,1) 11: 00 12: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 19: 00 00 1b: 48 3b 44 24 48 cmp 0x48(%rsp),%rax 20: 75 6d jne 0x8f 22: 44 89 f8 mov %r15d,%eax 25: 48 8d 65 e0 lea -0x20(%rbp),%rsp 29: 5b pop %rbx * 2a: 41 5c pop %r12 <-- trapping instruction 2c: 41 5e pop %r14 2e: 41 5f pop %r15 30: 5d pop %rbp 31: c3 retq 32: 65 8b 05 2e 5c 94 7e mov %gs:0x7e945c2e(%rip),%eax # 0x7e945c67 39: 41 bf 01 00 00 00 mov $0x1,%r15d 3f: a9 .byte 0xa9