INFO: task syz-executor.0:12140 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28600 pid:12140 ppid: 8414 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 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+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_finish+0xa2/0x650 fs/io_uring.c:7127 io_sq_offload_create fs/io_uring.c:7928 [inline] io_uring_create fs/io_uring.c:9401 [inline] io_uring_setup+0x2234/0x2930 fs/io_uring.c:9484 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f0a2ba30188 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000006e60 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffcde2fe9f R14: 00007f0a2ba30300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1647: #0: ffffffff8bf741a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8307: #0: ffff88801ce31db0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 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:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 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: 9609 Comm: kworker/0:4 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49 Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 aa c3 cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55 53 48 89 fb RSP: 0018:ffffc9000bc777d0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffea0000a45100 RCX: 0000000000000240 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888029144dc0 RBP: ffff88807cdc4240 R08: 0000000000000001 R09: ffffed1005228800 R10: fffff94000148a26 R11: 0000000000000100 R12: ffffed100f9b8b0d R13: dffffc0000000000 R14: ffffea0000a45180 R15: ffff88807cdc5868 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a269da000 CR3: 0000000014983000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: clear_page arch/x86/include/asm/page_64.h:49 [inline] clear_highpage include/linux/highmem.h:203 [inline] kernel_init_free_pages+0x99/0x120 mm/page_alloc.c:1212 prep_new_page mm/page_alloc.c:2307 [inline] get_page_from_freelist+0x1c6f/0x3fb0 mm/page_alloc.c:3946 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4996 __alloc_pages include/linux/gfp.h:525 [inline] __alloc_pages_node include/linux/gfp.h:538 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] slab_alloc_node mm/slab.c:3248 [inline] kmem_cache_alloc_node_trace+0x48f/0x570 mm/slab.c:3612 __do_kmalloc_node mm/slab.c:3634 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3649 kmalloc_reserve net/core/skbuff.c:353 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:424 alloc_skb include/linux/skbuff.h:1102 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:513 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x2ac/0xbd0 drivers/net/netdevsim/dev.c:611 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294