Hello, syzbot found the following issue on: HEAD commit: 7e96bf476270 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=158907b6300000 kernel config: https://syzkaller.appspot.com/x/.config?x=40eef000d7648480 dashboard link: https://syzkaller.appspot.com/bug?extid=ef4bb06ce1e14f09f852 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1239e076300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112ea71a300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ef4bb06ce1e14f09f852@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor761:8468 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor761 state:D stack:24312 pid: 8468 ppid: 8451 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 __flush_work+0x50e/0xad0 kernel/workqueue.c:3053 __drain_all_pages+0x47d/0x6c0 mm/page_alloc.c:3255 drain_all_pages mm/page_alloc.c:3269 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4643 [inline] __alloc_pages_slowpath.constprop.0+0x8e5/0x21b0 mm/page_alloc.c:5033 __alloc_pages+0x412/0x500 mm/page_alloc.c:5404 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 __get_free_pages+0x8/0x40 mm/page_alloc.c:5428 kasan_populate_vmalloc_pte mm/kasan/shadow.c:266 [inline] kasan_populate_vmalloc_pte+0x25/0x160 mm/kasan/shadow.c:257 apply_to_pte_range mm/memory.c:2532 [inline] apply_to_pmd_range mm/memory.c:2576 [inline] apply_to_pud_range mm/memory.c:2612 [inline] apply_to_p4d_range mm/memory.c:2648 [inline] __apply_to_page_range+0x694/0x1080 mm/memory.c:2682 alloc_vmap_area+0xb2d/0x1e30 mm/vmalloc.c:1530 __get_vm_area_node.constprop.0+0x128/0x380 mm/vmalloc.c:2389 __vmalloc_node_range+0x12e/0x960 mm/vmalloc.c:2956 __bpf_map_area_alloc+0xd5/0x150 kernel/bpf/syscall.c:311 array_map_alloc+0x285/0x710 kernel/bpf/arraymap.c:139 prog_array_map_alloc+0x1a0/0x290 kernel/bpf/arraymap.c:1055 find_and_alloc_map kernel/bpf/syscall.c:127 [inline] map_create kernel/bpf/syscall.c:833 [inline] __sys_bpf+0xbc3/0x53b0 kernel/bpf/syscall.c:4451 __do_sys_bpf kernel/bpf/syscall.c:4573 [inline] __se_sys_bpf kernel/bpf/syscall.c:4571 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445919 RSP: 002b:00007fb397e31318 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 0000000000445919 RDX: 0000000000000040 RSI: 0000000020011fd4 RDI: 0000000000000000 RBP: 00000000004ca400 R08: 00007fb397e31700 R09: 0000000000000000 R10: 00007fb397e31700 R11: 0000000000000246 R12: 000000000049a074 R13: 00007fff4a85ccaf R14: 00007fb397e31400 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/0:1/7: 2 locks held by kworker/1:1/26: 1 lock held by khungtaskd/1634: #0: ffffffff8b97ba40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by khugepaged/1665: #0: ffffffff8ba5e6a8 (lock#6){+.+.}-{3:3}, at: __lru_add_drain_all+0x65/0x760 mm/swap.c:791 1 lock held by in:imklog/8146: #0: ffff888029644ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 1 lock held by syz-executor761/8468: #0: ffffffff8ba9d4e8 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x6c0 mm/page_alloc.c:3204 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1634 Comm: khungtaskd Not tainted 5.14.0-rc3-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:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd0a/0xfc0 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: 26 Comm: kworker/1:1 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events prog_array_map_clear_deferred RIP: 0010:hlock_class kernel/locking/lockdep.c:199 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3701 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3757 [inline] RIP: 0010:__lock_acquire+0x1637/0x54a0 kernel/locking/lockdep.c:5015 Code: 20 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 a0 28 cd 8f e8 c1 04 61 00 48 0f a3 1d 49 5e 72 0e <0f> 83 fe 02 00 00 48 bd eb 83 b5 80 46 86 c8 61 49 0f af ef 48 c1 RSP: 0018:ffffc90000e0f8e8 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 0000000000000656 RCX: ffffffff815aca4f RDX: fffffbfff1f9a52e RSI: 0000000000000008 RDI: ffffffff8fcd2968 RBP: ffff888011b3c2e2 R08: 0000000000000000 R09: ffffffff8fcd296f R10: fffffbfff1f9a52d R11: 0000000000000000 R12: ffff888011b3c2c0 R13: ffff888011b3b880 R14: 0000000000000000 R15: 38d833c71a517839 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000236a2b8 CR3: 0000000036efe000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __mutex_lock_common kernel/locking/mutex.c:959 [inline] __mutex_lock+0x12a/0x10a0 kernel/locking/mutex.c:1104 fd_array_map_delete_elem+0x120/0x2e0 kernel/bpf/arraymap.c:801 bpf_fd_array_map_clear kernel/bpf/arraymap.c:851 [inline] prog_array_map_clear_deferred+0x10b/0x1b0 kernel/bpf/arraymap.c:1030 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
