INFO: task syz-executor.0:17001 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.0 state:D stack:25808 pid:17001 ppid: 12303 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6250 schedule+0x12b/0x1f0 kernel/sched/core.c:6323 io_uring_cancel_generic+0x5b3/0x661 fs/io_uring.c:9850 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x281/0x24f0 kernel/exit.c:787 do_group_exit+0x168/0x2d0 kernel/exit.c:929 get_signal+0x16b0/0x2090 kernel/signal.c:2820 arch_do_signal_or_restart+0x9c/0x730 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+0x191/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff87d1fcae9 RSP: 002b:00007ff87a772218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007ff87d30ff68 RCX: 00007ff87d1fcae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff87d30ff68 RBP: 00007ff87d30ff60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff87d30ff6c R13: 00007ffd23322eef R14: 00007ff87a772300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8cb1d8c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by in:imklog/6150: #0: ffff8880792645f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 ============================================= 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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc82/0xcd0 kernel/hung_task.c:295 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 946 Comm: kworker/u4:4 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:validate_chain+0xc6/0x8240 kernel/locking/lockdep.c:3745 Code: f2 f2 f2 f2 00 00 00 4b 89 44 25 1b 48 b8 f2 f2 f2 f2 f2 00 f2 f2 4b 89 44 25 27 48 b8 f2 05 f2 f2 f2 05 f3 f3 4b 89 44 25 2f <43> c6 44 25 37 f3 48 89 b4 24 98 00 00 00 48 8d 5e 20 48 89 d8 48 RSP: 0018:ffffc90003f2f380 EFLAGS: 00000806 RAX: f3f305f2f2f205f2 RBX: 0000000000000008 RCX: 116a7b9cdfe636aa RDX: 0000000000000000 RSI: ffff88801c2a61d8 RDI: ffff88801c2a5700 RBP: ffffc90003f2f690 R08: dffffc0000000000 R09: fffffbfff1fee1dd R10: fffffbfff1fee1dd R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff920007e5e90 R14: 116a7b9cdfe636aa R15: 116a7b9cdfe636aa FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1fb5c16000 CR3: 000000000c88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5015 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1d5/0x2590 kernel/locking/mutex.c:607 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 jump_label_lock kernel/jump_label.c:27 [inline] static_key_disable_cpuslocked+0x99/0x1b0 kernel/jump_label.c:205 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate+0x3c8/0x460 mm/kfence/core.c:640 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: f2 f2 f2 f2 00 00 repnz repnz repnz repnz add %al,(%rax) 6: 00 4b 89 add %cl,-0x77(%rbx) 9: 44 25 1b 48 b8 f2 rex.R and $0xf2b8481b,%eax f: f2 f2 f2 f2 00 f2 repnz repnz repnz repnz add %dh,%dl 15: f2 4b 89 44 25 27 repnz mov %rax,0x27(%r13,%r12,1) 1b: 48 b8 f2 05 f2 f2 f2 movabs $0xf3f305f2f2f205f2,%rax 22: 05 f3 f3 25: 4b 89 44 25 2f mov %rax,0x2f(%r13,%r12,1) * 2a: 43 c6 44 25 37 f3 movb $0xf3,0x37(%r13,%r12,1) <-- trapping instruction 30: 48 89 b4 24 98 00 00 mov %rsi,0x98(%rsp) 37: 00 38: 48 8d 5e 20 lea 0x20(%rsi),%rbx 3c: 48 89 d8 mov %rbx,%rax 3f: 48 rex.W