INFO: task syz-executor.1:17217 blocked for more than 143 seconds. Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28704 pid:17217 ppid: 3625 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5076 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6391 schedule+0xd2/0x1f0 kernel/sched/core.c:6463 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6522 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747 io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:11552 io_uring_clean_tctx fs/io_uring.c:11568 [inline] io_uring_cancel_generic+0x4f0/0x5bc fs/io_uring.c:11646 io_uring_files_cancel include/linux/io_uring.h:44 [inline] do_exit+0x4f9/0x2a00 kernel/exit.c:750 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x22df/0x24c0 kernel/signal.c:2875 arch_do_signal_or_restart+0x82/0x20f0 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f8846089109 RSP: 002b:00007f88471a0218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f884619c108 RCX: 00007f8846089109 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f884619c108 RBP: 00007f884619c100 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f884619c10c R13: 00007f88466cfb1f R14: 00007f88471a0300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8bd85460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 2 locks held by getty/3277: #0: ffff88814c728098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002ce62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075 2 locks held by kworker/u4:3/13981: #0: ffff8880b9c3a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:565 [inline] #0: ffff8880b9c3a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x8c/0x120 kernel/sched/core.c:550 #1: ffff8880b9d27848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: try_to_wake_up+0xaa/0x1800 kernel/sched/core.c:4085 3 locks held by syz-executor.1/17211: 1 lock held by syz-executor.1/17217: #0: ffff888073f190a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:11552 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #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:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3665 Comm: kworker/u4:5 Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy14 ieee80211_iface_work RIP: 0010:ieee80211_sta_get_rates+0x528/0x960 net/mac80211/util.c:2175 Code: b6 14 30 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 73 03 00 00 41 0f b7 46 04 03 44 24 30 8b 5c 24 20 99 f7 7c 24 24 <89> de 41 89 c6 89 c7 e8 ac bd b1 f8 41 39 de 0f 85 20 ff ff ff e8 RSP: 0018:ffffc9000418fa40 EFLAGS: 00000206 RAX: 000000000000000a RBX: 000000000000021c RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff888076efdf3c RBP: 000000000000000c R08: 0000000000000000 R09: 000000000000006c R10: ffffffff88c7d7ca R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888076efdf38 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c003baa008 CR3: 0000000023ea9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_update_sta_info net/mac80211/ibss.c:1003 [inline] ieee80211_rx_bss_info net/mac80211/ibss.c:1117 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline] ieee80211_ibss_rx_queued_mgmt+0x11c8/0x33b0 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline] ieee80211_iface_work+0xa6f/0xd10 net/mac80211/iface.c:1581 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 ---------------- Code disassembly (best guess): 0: b6 14 mov $0x14,%dh 2: 30 48 89 xor %cl,-0x77(%rax) 5: f8 clc 6: 83 e0 07 and $0x7,%eax 9: 83 c0 01 add $0x1,%eax c: 38 d0 cmp %dl,%al e: 7c 08 jl 0x18 10: 84 d2 test %dl,%dl 12: 0f 85 73 03 00 00 jne 0x38b 18: 41 0f b7 46 04 movzwl 0x4(%r14),%eax 1d: 03 44 24 30 add 0x30(%rsp),%eax 21: 8b 5c 24 20 mov 0x20(%rsp),%ebx 25: 99 cltd 26: f7 7c 24 24 idivl 0x24(%rsp) * 2a: 89 de mov %ebx,%esi <-- trapping instruction 2c: 41 89 c6 mov %eax,%r14d 2f: 89 c7 mov %eax,%edi 31: e8 ac bd b1 f8 callq 0xf8b1bde2 36: 41 39 de cmp %ebx,%r14d 39: 0f 85 20 ff ff ff jne 0xffffff5f 3f: e8 .byte 0xe8