INFO: task syz-executor.1:27186 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27896 pid:27186 ppid: 18980 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9850 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x263/0x2a20 kernel/exit.c:781 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47d/0x21d0 kernel/signal.c:2855 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fcbf36c0ae9 RSP: 002b:00007fcbf0c36218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fcbf37d3f68 RCX: 00007fcbf36c0ae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcbf37d3f68 RBP: 00007fcbf37d3f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbf37d3f6c R13: 00007ffc3c8dbd0f R14: 00007fcbf0c36300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/27: #0: ffffffff8b97ffe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6168: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 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: 7 Comm: kworker/0:1 Not tainted 5.15.0-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:__lock_is_held kernel/locking/lockdep.c:5376 [inline] RIP: 0010:lock_is_held_type+0x10d/0x140 kernel/locking/lockdep.c:5668 Code: 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 <45> 31 ed eb b9 0f 0b 48 c7 c7 60 ef 8b 89 e8 60 0d 00 00 65 c7 05 RSP: 0000:ffffc90000edf998 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8b97ff20 RDI: ffff88813fe88c98 RBP: ffffffff8b97ff20 R08: 0000000000000000 R09: ffffffff8d6eaa97 R10: fffffbfff1add552 R11: 0000000000000001 R12: ffff88813fe881c0 R13: ffff88813fe88c20 R14: 00000000ffffffff R15: ffff88813fe88c98 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f003381f000 CR3: 000000001fd1d000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_mm_page_alloc include/trace/events/kmem.h:201 [inline] __alloc_pages+0x3b6/0x500 mm/page_alloc.c:5403 __alloc_pages_node include/linux/gfp.h:566 [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:3249 [inline] kmem_cache_alloc_node_trace+0x4c6/0x5c0 mm/slab.c:3617 __do_kmalloc_node mm/slab.c:3639 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3654 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1116 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x2ac/0xbd0 drivers/net/netdevsim/dev.c:762 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: 76 83 jbe 0xffffff85 2: f8 clc 3: 01 75 29 add %esi,0x29(%rbp) 6: 9c pushfq 7: 58 pop %rax 8: f6 c4 02 test $0x2,%ah b: 75 3d jne 0x4a d: 48 f7 04 24 00 02 00 testq $0x200,(%rsp) 14: 00 15: 74 01 je 0x18 17: fb sti 18: 48 83 c4 08 add $0x8,%rsp 1c: 44 89 e8 mov %r13d,%eax 1f: 5b pop %rbx 20: 5d pop %rbp 21: 41 5c pop %r12 23: 41 5d pop %r13 25: 41 5e pop %r14 27: 41 5f pop %r15 29: c3 retq * 2a: 45 31 ed xor %r13d,%r13d <-- trapping instruction 2d: eb b9 jmp 0xffffffe8 2f: 0f 0b ud2 31: 48 c7 c7 60 ef 8b 89 mov $0xffffffff898bef60,%rdi 38: e8 60 0d 00 00 callq 0xd9d 3d: 65 gs 3e: c7 .byte 0xc7 3f: 05 .byte 0x5