INFO: task kcompactd0:1155 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-next-20200703-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kcompactd0 D29424 1155 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 io_schedule+0xb5/0x120 kernel/sched/core.c:5935 wait_on_page_bit_common+0x34f/0xda0 mm/filemap.c:1124 lock_page include/linux/pagemap.h:580 [inline] __unmap_and_move mm/migrate.c:1046 [inline] unmap_and_move mm/migrate.c:1221 [inline] migrate_pages+0x19a0/0x2fd0 mm/migrate.c:1472 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.3:11040 can't die for more than 145 seconds. syz-executor.3 R running task 21776 11040 7145 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4325 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+0x497/0xd20 mm/vmscan.c:1974 shrink_list mm/vmscan.c:2168 [inline] shrink_lruvec+0x58f/0x10f0 mm/vmscan.c:2462 shrink_node_memcgs mm/vmscan.c:2651 [inline] shrink_node+0x4b0/0x1b60 mm/vmscan.c:2765 shrink_zones mm/vmscan.c:2968 [inline] do_try_to_free_pages+0x38b/0x1340 mm/vmscan.c:3021 try_to_free_pages+0x29e/0x7f0 mm/vmscan.c:3260 __perform_reclaim mm/page_alloc.c:4246 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4267 [inline] __alloc_pages_slowpath.constprop.0+0x949/0x2780 mm/page_alloc.c:4673 __alloc_pages_nodemask+0x5a3/0x700 mm/page_alloc.c:4886 __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+0x89/0x440 mm/slab.c:2594 fallback_alloc+0x205/0x2d0 mm/slab.c:3141 __do_cache_alloc mm/slab.c:3279 [inline] slab_alloc mm/slab.c:3308 [inline] kmem_cache_alloc+0x307/0x550 mm/slab.c:3486 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+0x10e2/0x1650 block/blk-merge.c:331 blk_mq_submit_bio+0x1b0/0x1760 block/blk-mq.c:2149 __submit_bio_noacct_mq block/blk-core.c:1180 [inline] submit_bio_noacct+0xca0/0x12d0 block/blk-core.c:1213 submit_bio+0x263/0x5b0 block/blk-core.c:1283 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:2446 [inline] filemap_fault+0x1a3d/0x2ab0 mm/filemap.c:2534 __do_fault+0x10d/0x4d0 mm/memory.c:3467 do_read_fault mm/memory.c:3860 [inline] do_fault mm/memory.c:3988 [inline] handle_pte_fault mm/memory.c:4228 [inline] __handle_mm_fault mm/memory.c:4360 [inline] handle_mm_fault+0x37a3/0x43f0 mm/memory.c:4397 do_user_addr_fault+0x5a2/0xd00 arch/x86/mm/fault.c:1295 handle_page_fault arch/x86/mm/fault.c:1365 [inline] exc_page_fault+0xab/0x170 arch/x86/mm/fault.c:1418 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 RIP: 0010:copy_user_generic_unrolled+0x86/0xc0 arch/x86/lib/copy_user_64.S:90 Code: 4c 8b 5e 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 <4c> 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 RSP: 0018:ffffc90002ea7918 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000020000140 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000020000140 RDI: ffffc90002ea7980 RBP: 0000000000000038 R08: 0000000000000001 R09: ffffc90002ea79b7 R10: fffff520005d4f36 R11: 0000000000000000 R12: ffffc90002ea7980 R13: 0000000020000178 R14: 00007ffffffff000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:68 [inline] _copy_from_user+0x11c/0x190 lib/usercopy.c:15 copy_from_user include/linux/uaccess.h:144 [inline] __copy_msghdr_from_user+0x91/0x4b0 net/socket.c:2234 copy_msghdr_from_user net/socket.c:2285 [inline] sendmsg_copy_msghdr+0xa1/0x160 net/socket.c:2383 ___sys_sendmsg+0xc6/0x170 net/socket.c:2402 __sys_sendmmsg+0x195/0x480 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2522 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007fefeb542c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000004fd7a0 RCX: 000000000045cb29 RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000904 R14: 00000000004cbe1c R15: 00007fefeb5436d4 Showing all locks held in the system: 2 locks held by systemd/1: 4 locks held by kworker/u4:1/21: 1 lock held by khungtaskd/1150: #0: ffffffff89bc3040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by kswapd1/1672: 2 locks held by systemd-journal/3874: 1 lock held by systemd-udevd/3875: 3 locks held by systemd-timesyn/4364: 2 locks held by cron/6592: 1 lock held by in:imklog/6653: 2 locks held by agetty/6715: #0: ffff8880a6b32098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000f902e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 2 locks held by syz-fuzzer/6787: 1 lock held by syz-fuzzer/6788: 2 locks held by syz-fuzzer/6789: 2 locks held by syz-fuzzer/6791: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1150 Comm: khungtaskd Not tainted 5.8.0-rc3-next-20200703-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+0x70/0xb1 lib/nmi_backtrace.c:101 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3874 Comm: systemd-journal Not tainted 5.8.0-rc3-next-20200703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:write_comp_data+0x78/0x80 kernel/kcov.c:242 Code: 00 00 4e 8d 0c dd 28 00 00 00 4c 39 ce 72 1b 49 83 c0 01 4a 89 7c 08 e0 4e 89 54 08 e8 4a 89 54 08 f0 4a 89 4c d8 20 4c 89 00 0f 1f 80 00 00 00 00 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff RSP: 0018:ffffc90001616ff8 EFLAGS: 00000093 RAX: 0000000000000000 RBX: ffffea0007c9a100 RCX: ffffffff819b1908 RDX: 0000000000000000 RSI: ffff888093302280 RDI: 0000000000000007 RBP: ffffea0007c9a100 R08: 0000000000000001 R09: ffffea0007c9a137 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88821b77c820 R14: 0000000000000001 R15: ffff88821b77c820 FS: 00007ff6401b38c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000436790 CR3: 00000000931fc000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: compound_head include/linux/page-flags.h:184 [inline] ClearPageLRU include/linux/page-flags.h:328 [inline] __isolate_lru_page+0x4f8/0x980 mm/vmscan.c:1602 isolate_lru_pages+0x435/0x1140 mm/vmscan.c:1691 shrink_inactive_list+0x190/0xd20 mm/vmscan.c:1944 shrink_list mm/vmscan.c:2168 [inline] shrink_lruvec+0x58f/0x10f0 mm/vmscan.c:2462 shrink_node_memcgs mm/vmscan.c:2651 [inline] shrink_node+0x4b0/0x1b60 mm/vmscan.c:2765 shrink_zones mm/vmscan.c:2968 [inline] do_try_to_free_pages+0x38b/0x1340 mm/vmscan.c:3021 try_to_free_pages+0x29e/0x7f0 mm/vmscan.c:3260 __perform_reclaim mm/page_alloc.c:4246 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4267 [inline] __alloc_pages_slowpath.constprop.0+0x949/0x2780 mm/page_alloc.c:4673 __alloc_pages_nodemask+0x5a3/0x700 mm/page_alloc.c:4886 alloc_pages_current+0x187/0x280 mm/mempolicy.c:2275 alloc_pages include/linux/gfp.h:545 [inline] __page_cache_alloc mm/filemap.c:957 [inline] __page_cache_alloc+0x31e/0x450 mm/filemap.c:942 pagecache_get_page+0x2a6/0xf70 mm/filemap.c:1667 filemap_fault+0x1a94/0x2ab0 mm/filemap.c:2536 ext4_filemap_fault+0x87/0xb6 fs/ext4/inode.c:6060 __do_fault+0x10d/0x4d0 mm/memory.c:3467 do_read_fault mm/memory.c:3860 [inline] do_fault mm/memory.c:3988 [inline] handle_pte_fault mm/memory.c:4228 [inline] __handle_mm_fault mm/memory.c:4360 [inline] handle_mm_fault+0x37a3/0x43f0 mm/memory.c:4397 do_user_addr_fault+0x5a2/0xd00 arch/x86/mm/fault.c:1295 handle_page_fault arch/x86/mm/fault.c:1365 [inline] exc_page_fault+0xab/0x170 arch/x86/mm/fault.c:1418 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 RIP: 0033:0x7ff63f47d2e3 Code: Bad RIP value. RSP: 002b:00007ffeefa659f8 EFLAGS: 00010246 RAX: 0000000000000001 RBX: 000055d2aa9af1e0 RCX: 00007ff63f47d2e3 RDX: 0000000000000013 RSI: 00007ffeefa65a00 RDI: 0000000000000008 RBP: 00007ffeefa65bf0 R08: 0000000000989680 R09: 00007ffeefb7e080 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffeefa65a00 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005a9c8faa199c5