INFO: task kcompactd0:1176 blocked for more than 143 seconds. Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:28752 pid: 1176 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 io_schedule+0xb5/0x120 kernel/sched/core.c:6296 wait_on_page_bit_common+0x52c/0xca0 mm/filemap.c:1191 lock_page include/linux/pagemap.h:548 [inline] __unmap_and_move mm/migrate.c:1046 [inline] unmap_and_move mm/migrate.c:1196 [inline] migrate_pages+0x781/0x3230 mm/migrate.c:1452 compact_zone+0x1b0e/0x39d0 mm/compaction.c:2315 kcompactd_do_work+0x2bd/0x770 mm/compaction.c:2725 kcompactd+0x25d/0xd00 mm/compaction.c:2820 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.0:18812 can't die for more than 144 seconds. task:syz-executor.0 state:R running task stack:22440 pid:18812 ppid: 6842 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4683 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x67/0x80 kernel/locking/spinlock.c:199 spin_unlock_irq include/linux/spinlock.h:404 [inline] shrink_inactive_list+0x4a0/0xd20 mm/vmscan.c:1973 shrink_list mm/vmscan.c:2168 [inline] shrink_lruvec+0x5fe/0x1160 mm/vmscan.c:2463 shrink_node_memcgs mm/vmscan.c:2643 [inline] shrink_node+0x829/0x1d10 mm/vmscan.c:2760 shrink_zones mm/vmscan.c:2963 [inline] do_try_to_free_pages+0x38b/0x1420 mm/vmscan.c:3018 try_to_free_pages+0x29e/0x7d0 mm/vmscan.c:3257 __perform_reclaim mm/page_alloc.c:4260 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4281 [inline] __alloc_pages_slowpath.constprop.0+0x995/0x2860 mm/page_alloc.c:4685 __alloc_pages_nodemask+0x62c/0x790 mm/page_alloc.c:4901 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] kmem_getpages mm/slab.c:1376 [inline] cache_grow_begin+0x71/0x430 mm/slab.c:2590 fallback_alloc+0x205/0x2d0 mm/slab.c:3137 __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3304 [inline] kmem_cache_alloc+0x236/0x3a0 mm/slab.c:3482 mempool_alloc+0x146/0x350 mm/mempool.c:393 bio_alloc_bioset+0x37b/0x5d0 block/bio.c:486 bio_clone_fast+0x21/0x1b0 block/bio.c:710 bio_split+0xc7/0x2c0 block/bio.c:1477 blk_bio_segment_split block/blk-merge.c:281 [inline] __blk_queue_split+0x10e1/0x1650 block/blk-merge.c:331 blk_mq_submit_bio+0x1b0/0x1760 block/blk-mq.c:2156 __submit_bio_noacct_mq block/blk-core.c:1179 [inline] submit_bio_noacct+0xc78/0x12b0 block/blk-core.c:1212 submit_bio+0x263/0x5b0 block/blk-core.c:1282 mpage_bio_submit fs/mpage.c:66 [inline] do_mpage_readpage+0x1054/0x1ef0 fs/mpage.c:316 mpage_readahead+0x3a3/0x880 fs/mpage.c:391 read_pages+0x1df/0x8d0 mm/readahead.c:130 page_cache_readahead_unbounded+0x572/0x850 mm/readahead.c:244 __do_page_cache_readahead+0xc2/0xf0 mm/readahead.c:273 ra_submit mm/internal.h:64 [inline] do_sync_mmap_readahead mm/filemap.c:2505 [inline] filemap_fault+0x1a3d/0x2ab0 mm/filemap.c:2593 __do_fault+0x10d/0x4d0 mm/memory.c:3474 do_shared_fault mm/memory.c:3921 [inline] do_fault mm/memory.c:3999 [inline] handle_pte_fault mm/memory.c:4235 [inline] __handle_mm_fault mm/memory.c:4370 [inline] handle_mm_fault+0x3523/0x4530 mm/memory.c:4468 do_user_addr_fault+0x598/0xbf0 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0xa8/0x160 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 RIP: 0033:0x444857 Code: Bad RIP value. RSP: 002b:00007ffcf90fb9b8 EFLAGS: 00010202 RAX: 0000000020000100 RBX: 0000000000000000 RCX: 706e692f7665642f RDX: 0000000000000010 RSI: 0000000001190188 RDI: 0000000020000100 RBP: 0000000001190168 R08: 006563696d2f7475 R09: 00000000a6b79111 R10: 00007ffcf90fbaa0 R11: 0000000000000246 R12: 0000000001190170 R13: 000000000007a30b R14: fffffffffffffffe R15: 000000000118cf4c Showing all locks held in the system: 1 lock held by systemd/1: 1 lock held by khungtaskd/1159: #0: ffffffff89c67640 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5825 1 lock held by kswapd1/1689: 2 locks held by systemd-journal/3905: 2 locks held by systemd-timesyn/4415: 1 lock held by cron/6516: 1 lock held by rsyslogd/6530: 2 locks held by in:imklog/6540: 2 locks held by syz-fuzzer/6840: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1159 Comm: khungtaskd Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 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: 18812 Comm: syz-executor.0 Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__mod_memcg_lruvec_state+0xe7/0x320 mm/memcontrol.c:833 Code: 01 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 49 83 c6 20 80 3c 02 00 0f 85 ac 01 00 00 48 8b 83 90 00 00 00 65 4a 8b 14 f8 <4c> 01 ea 48 89 d1 49 89 d5 48 c1 f9 3f 48 89 c8 48 31 d0 48 29 c8 RSP: 0018:ffffc900018ce3d8 EFLAGS: 00000046 RAX: 0000607f51607908 RBX: ffff88821b779800 RCX: 1ffff110436ef310 RDX: 0000000000000007 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000010 R08: 0000000000000000 R09: ffffea00053aa947 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821b779890 R13: 0000000000000001 R14: 0000000000000020 R15: 0000000000000002 FS: 0000000002741940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff7c9df3303 CR3: 00000000979fa000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __update_lru_size include/linux/mm_inline.h:33 [inline] update_lru_size include/linux/mm_inline.h:42 [inline] move_pages_to_lru.isra.0+0x48b/0x1940 mm/vmscan.c:1866 shrink_inactive_list+0x38d/0xd20 mm/vmscan.c:1963 shrink_list mm/vmscan.c:2168 [inline] shrink_lruvec+0x5fe/0x1160 mm/vmscan.c:2463 shrink_node_memcgs mm/vmscan.c:2643 [inline] shrink_node+0x829/0x1d10 mm/vmscan.c:2760 shrink_zones mm/vmscan.c:2963 [inline] do_try_to_free_pages+0x38b/0x1420 mm/vmscan.c:3018 try_to_free_pages+0x29e/0x7d0 mm/vmscan.c:3257 __perform_reclaim mm/page_alloc.c:4260 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4281 [inline] __alloc_pages_slowpath.constprop.0+0x995/0x2860 mm/page_alloc.c:4685 __alloc_pages_nodemask+0x62c/0x790 mm/page_alloc.c:4901 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] kmem_getpages mm/slab.c:1376 [inline] cache_grow_begin+0x71/0x430 mm/slab.c:2590 fallback_alloc+0x205/0x2d0 mm/slab.c:3137 __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3304 [inline] kmem_cache_alloc+0x236/0x3a0 mm/slab.c:3482 mempool_alloc+0x146/0x350 mm/mempool.c:393 bio_alloc_bioset+0x37b/0x5d0 block/bio.c:486 bio_clone_fast+0x21/0x1b0 block/bio.c:710 bio_split+0xc7/0x2c0 block/bio.c:1477 blk_bio_segment_split block/blk-merge.c:281 [inline] __blk_queue_split+0x10e1/0x1650 block/blk-merge.c:331 blk_mq_submit_bio+0x1b0/0x1760 block/blk-mq.c:2156 __submit_bio_noacct_mq block/blk-core.c:1179 [inline] submit_bio_noacct+0xc78/0x12b0 block/blk-core.c:1212 submit_bio+0x263/0x5b0 block/blk-core.c:1282 mpage_bio_submit fs/mpage.c:66 [inline] do_mpage_readpage+0x1054/0x1ef0 fs/mpage.c:316 mpage_readahead+0x3a3/0x880 fs/mpage.c:391 read_pages+0x1df/0x8d0 mm/readahead.c:130 page_cache_readahead_unbounded+0x572/0x850 mm/readahead.c:244 __do_page_cache_readahead+0xc2/0xf0 mm/readahead.c:273 ra_submit mm/internal.h:64 [inline] do_sync_mmap_readahead mm/filemap.c:2505 [inline] filemap_fault+0x1a3d/0x2ab0 mm/filemap.c:2593 __do_fault+0x10d/0x4d0 mm/memory.c:3474 do_shared_fault mm/memory.c:3921 [inline] do_fault mm/memory.c:3999 [inline] handle_pte_fault mm/memory.c:4235 [inline] __handle_mm_fault mm/memory.c:4370 [inline] handle_mm_fault+0x3523/0x4530 mm/memory.c:4468 do_user_addr_fault+0x598/0xbf0 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0xa8/0x160 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 RIP: 0033:0x444857 Code: Bad RIP value. RSP: 002b:00007ffcf90fb9b8 EFLAGS: 00010202 RAX: 0000000020000100 RBX: 0000000000000000 RCX: 706e692f7665642f RDX: 0000000000000010 RSI: 0000000001190188 RDI: 0000000020000100 RBP: 0000000001190168 R08: 006563696d2f7475 R09: 00000000a6b79111 R10: 00007ffcf90fbaa0 R11: 0000000000000246 R12: 0000000001190170 R13: 000000000007a30b R14: fffffffffffffffe R15: 000000000118cf4c