INFO: task kcompactd0:30 blocked for more than 143 seconds. Not tainted 5.15.0-rc5-next-20211018-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:27880 pid: 30 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4965 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6246 schedule+0xd2/0x260 kernel/sched/core.c:6319 io_schedule+0xba/0x130 kernel/sched/core.c:8363 folio_wait_bit_common+0x4f2/0xa60 mm/filemap.c:1364 lock_page include/linux/pagemap.h:747 [inline] __unmap_and_move mm/migrate.c:980 [inline] unmap_and_move mm/migrate.c:1204 [inline] migrate_pages+0xa5a/0x3880 mm/migrate.c:1481 compact_zone+0x1abb/0x3860 mm/compaction.c:2393 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2833 kcompactd+0x86b/0xf30 mm/compaction.c:2935 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor.2:12890 can't die for more than 145 seconds. task:syz-executor.2 state:R running task stack:26760 pid:12890 ppid: 12441 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4965 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6246 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6412 __cond_resched+0x13/0x20 kernel/sched/core.c:8125 _cond_resched include/linux/sched.h:2027 [inline] shrink_lruvec+0xf8c/0x25b0 mm/vmscan.c:2854 shrink_node_memcgs mm/vmscan.c:3038 [inline] shrink_node+0x858/0x1eb0 mm/vmscan.c:3161 shrink_zones mm/vmscan.c:3364 [inline] do_try_to_free_pages+0x386/0x1480 mm/vmscan.c:3419 try_to_free_pages+0x29f/0x750 mm/vmscan.c:3654 __perform_reclaim mm/page_alloc.c:4586 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4607 [inline] __alloc_pages_slowpath.constprop.0+0xac7/0x2290 mm/page_alloc.c:5024 __alloc_pages+0x412/0x500 mm/page_alloc.c:5399 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 folio_alloc+0x1c/0x70 mm/mempolicy.c:2201 filemap_alloc_folio+0x8e/0xb0 mm/filemap.c:1029 __page_cache_alloc include/linux/pagemap.h:325 [inline] page_cache_ra_unbounded+0x36a/0x940 mm/readahead.c:215 do_page_cache_ra+0xf9/0x140 mm/readahead.c:268 do_sync_mmap_readahead mm/filemap.c:2986 [inline] filemap_fault+0x1562/0x26d0 mm/filemap.c:3079 __do_fault+0x10d/0x4d0 mm/memory.c:3849 do_shared_fault mm/memory.c:4210 [inline] do_fault mm/memory.c:4288 [inline] handle_pte_fault mm/memory.c:4542 [inline] __handle_mm_fault+0x25ad/0x5120 mm/memory.c:4677 handle_mm_fault+0x1c8/0x790 mm/memory.c:4775 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x7fcb0df8ce46 RSP: 002b:00007ffe7cee5c48 EFLAGS: 00010202 RAX: 0000000020000080 RBX: 0000000000000000 RCX: 0030626c6c756e2f RDX: 000000000000000c RSI: 6c756e2f7665642f RDI: 0000000020000080 RBP: 00007ffe7cee5d08 R08: 00007fcb0e499000 R09: 0000001b2d422298 R10: 0000000000000605 R11: 0000000000000000 R12: 0000000000000000 R13: 00000000000003e8 R14: 00007fcb0e094f60 R15: 00000000002746ad Showing all locks held in the system: 3 locks held by kworker/u4:1/10: 1 lock held by khungtaskd/27: #0: ffffffff8bb835e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by kswapd0/98: 1 lock held by kswapd1/99: 3 locks held by systemd-journal/2949: 1 lock held by systemd-udevd/2971: 3 locks held by kworker/1:4/2980: 1 lock held by systemd-timesyn/3058: 1 lock held by in:imklog/6234: 4 locks held by rs:main Q:Reg/6235: 1 lock held by cron/6237: 2 locks held by syz-fuzzer/6541: 2 locks held by syz-fuzzer/9752: 1 lock held by syz-executor.5/9908: #0: ffffffff8bca73c8 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x6c0 mm/page_alloc.c:3179 3 locks held by kworker/0:0/10790: 1 lock held by syz-executor.2/12890: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc5-next-20211018-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:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12872 Comm: kworker/u4:3 Not tainted 5.15.0-rc5-next-20211018-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x30/0x180 mm/kasan/generic.c:189 Code: 01 00 00 49 89 f9 41 54 44 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 05 01 00 00 <49> 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 RSP: 0018:ffffc900063577f0 EFLAGS: 00000012 RAX: ffff7fffffffffff RBX: ffffffff906e0300 RCX: ffffffff815c399c RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ff47a00 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ff47a08 R10: fffffbfff1fe8f40 R11: 0000000000000000 R12: ffff88801bcd8ab8 R13: ffff88801bcd8000 R14: 0000000000040000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0be6d7b303 CR3: 000000000b88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hlock_class kernel/locking/lockdep.c:199 [inline] check_wait_context kernel/locking/lockdep.c:4701 [inline] __lock_acquire+0x47c/0x54a0 kernel/locking/lockdep.c:4977 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 __debug_object_init+0xb1/0xd10 lib/debugobjects.c:569 init_timer_on_stack_key kernel/time/timer.c:752 [inline] schedule_timeout+0xf2/0x2a0 kernel/time/timer.c:1879 toggle_allocation_gate mm/kfence/core.c:738 [inline] toggle_allocation_gate+0x305/0x390 mm/kfence/core.c:723 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 01 00 add %eax,(%rax) 2: 00 49 89 add %cl,-0x77(%rcx) 5: f9 stc 6: 41 54 push %r12 8: 44 0f b6 c2 movzbl %dl,%r8d c: 49 01 f1 add %rsi,%r9 f: 55 push %rbp 10: 53 push %rbx 11: 0f 82 18 01 00 00 jb 0x12f 17: 48 b8 ff ff ff ff ff movabs $0xffff7fffffffffff,%rax 1e: 7f ff ff 21: 48 39 c7 cmp %rax,%rdi 24: 0f 86 05 01 00 00 jbe 0x12f * 2a: 49 83 e9 01 sub $0x1,%r9 <-- trapping instruction 2e: 48 89 fd mov %rdi,%rbp 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 4d 89 ca mov %r9,%r10 3e: 48 rex.W 3f: c1 .byte 0xc1