INFO: task syz-executor209:6560 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor209 state:D stack:27808 pid: 6560 ppid: 6558 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9694 io_uring_clean_tctx fs/io_uring.c:9710 [inline] io_uring_cancel_generic+0x5cb/0x760 fs/io_uring.c:9798 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 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: 0033:0x7f6718cf4279 RSP: 002b:00007f6718ca51f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 00000000000002ff RBX: 00007f6718d7c408 RCX: 00007f6718cf4279 RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003 RBP: 00007f6718d7c400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6718d7c40c R13: 00007fff127612df R14: 00007f6718ca5300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b981b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6259: #0: ffff88801d9885f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 1 lock held by syz-executor209/6560: #0: ffff8880786e20a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9694 1 lock held by syz-executor209/6563: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc6-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+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: 6563 Comm: syz-executor209 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xd49/0x54a0 kernel/locking/lockdep.c:5025 Code: 03 0f b6 04 02 84 c0 74 0d 3c 03 7f 09 48 8b 3c 24 e8 cb 56 62 00 41 8b 85 18 0a 00 00 83 c0 01 83 f8 2f 41 89 85 18 0a 00 00 <0f> 87 18 0b 00 00 3b 05 fb 20 e9 0d 41 be 01 00 00 00 0f 86 c8 00 RSP: 0018:ffffc9000249f558 EFLAGS: 00000093 RAX: 0000000000000002 RBX: 000000002e9fb5d5 RCX: 2bef69cb239427f6 RDX: 1ffff110030644d3 RSI: 0000000000000001 RDI: ffffffff8fd01c40 RBP: 0000000000000003 R08: 0000000000000000 R09: ffffffff8fcff9e7 R10: fffffbfff1f9ff3c R11: 0000000000086089 R12: ffff8880183226c8 R13: ffff888018321c80 R14: 0000000000000000 R15: 2bef69cb239427f6 FS: 00007f6718c42700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6718d49498 CR3: 0000000019aa0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] is_bpf_text_address+0x36/0x170 kernel/bpf/core.c:706 kernel_text_address kernel/extable.c:151 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] io_add_buffers fs/io_uring.c:4385 [inline] io_provide_buffers fs/io_uring.c:4419 [inline] io_issue_sqe+0x3289/0x7180 fs/io_uring.c:6731 __io_queue_sqe+0x90/0xb50 fs/io_uring.c:6960 io_req_task_submit+0xbf/0x1b0 fs/io_uring.c:2234 tctx_task_work+0x189/0x6c0 fs/io_uring.c:2159 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_signal include/linux/tracehook.h:214 [inline] handle_signal_work kernel/entry/common.c:146 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x256/0x290 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: 0033:0x7f6718cf4279 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6718c421f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 00000000000002ff RBX: 00007f6718d7c438 RCX: 00007f6718cf4279 RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003 RBP: 00007f6718d7c430 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6718d7c43c R13: 00007fff127612df R14: 00007f6718c42300 R15: 0000000000022000 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.811 msecs ---------------- Code disassembly (best guess): 0: 03 0f add (%rdi),%ecx 2: b6 04 mov $0x4,%dh 4: 02 84 c0 74 0d 3c 03 add 0x33c0d74(%rax,%rax,8),%al b: 7f 09 jg 0x16 d: 48 8b 3c 24 mov (%rsp),%rdi 11: e8 cb 56 62 00 callq 0x6256e1 16: 41 8b 85 18 0a 00 00 mov 0xa18(%r13),%eax 1d: 83 c0 01 add $0x1,%eax 20: 83 f8 2f cmp $0x2f,%eax 23: 41 89 85 18 0a 00 00 mov %eax,0xa18(%r13) * 2a: 0f 87 18 0b 00 00 ja 0xb48 <-- trapping instruction 30: 3b 05 fb 20 e9 0d cmp 0xde920fb(%rip),%eax # 0xde92131 36: 41 be 01 00 00 00 mov $0x1,%r14d 3c: 0f .byte 0xf 3d: 86 c8 xchg %cl,%al