INFO: task syz-executor.1:7587 blocked for more than 143 seconds. Not tainted 5.18.0-rc1-next-20220404-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27256 pid: 7587 ppid: 3630 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5106 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6415 schedule+0xd2/0x1f0 kernel/sched/core.c:6487 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 io_wq_exit_workers fs/io-wq.c:1266 [inline] io_wq_put_and_exit+0x4d6/0xe40 fs/io-wq.c:1301 io_uring_clean_tctx fs/io_uring.c:10584 [inline] io_uring_cancel_generic+0x538/0x5bc fs/io_uring.c:10654 io_uring_files_cancel include/linux/io_uring.h:18 [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:2864 arch_do_signal_or_restart+0x88/0x1a10 arch/x86/kernel/signal.c:867 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+0x19/0x60 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f84f9a89049 RSP: 002b:00007f84fac2a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f84f9b9bf68 RCX: 00007f84f9a89049 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f84f9b9bf68 RBP: 00007f84f9b9bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f84f9b9bf6c R13: 00007ffc8a6c172f R14: 00007f84fac2a300 R15: 0000000000022000 INFO: task iou-wrk-7587:7597 can't die for more than 143 seconds. task:iou-wrk-7587 state:R running task stack:27904 pid: 7597 ppid: 3630 flags:0x00024006 Call Trace: context_switch kernel/sched/core.c:5106 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6415 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8bd82560 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6498 2 locks held by getty/3275: #0: ffff888015c14098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002e732e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 5.18.0-rc1-next-20220404-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: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:256 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:413 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7537 Comm: kworker/u4:9 Not tainted 5.18.0-rc1-next-20220404-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy9 ieee80211_iface_work RIP: 0010:ieee80211_iface_process_skb net/mac80211/iface.c:1418 [inline] RIP: 0010:ieee80211_iface_work+0x31a/0xd10 net/mac80211/iface.c:1581 Code: 48 c1 e8 03 80 3c 08 00 0f 85 76 09 00 00 4c 8b a5 d0 00 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 03 0f b6 14 08 <4c> 89 e0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 38 09 00 00 45 RSP: 0018:ffffc90007517cb0 EFLAGS: 00000a02 RAX: 1ffff1100416238a RBX: ffff8880746b4d00 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff88ae26cc RDI: ffff888071a5e210 RBP: ffff888071a5e140 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff88ae26bb R11: 0000000000000d89 R12: ffff888020b11c50 R13: 0000000000000000 R14: ffff8881497fe700 R15: ffff8880746b5890 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00cb6e0d0 CR3: 0000000024ecb000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:298 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 8: 0f 85 76 09 00 00 jne 0x984 e: 4c 8b a5 d0 00 00 00 mov 0xd0(%rbp),%r12 15: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 1c: fc ff df 1f: 4c 89 e0 mov %r12,%rax 22: 48 c1 e8 03 shr $0x3,%rax 26: 0f b6 14 08 movzbl (%rax,%rcx,1),%edx * 2a: 4c 89 e0 mov %r12,%rax <-- trapping instruction 2d: 83 e0 07 and $0x7,%eax 30: 83 c0 01 add $0x1,%eax 33: 38 d0 cmp %dl,%al 35: 7c 08 jl 0x3f 37: 84 d2 test %dl,%dl 39: 0f 85 38 09 00 00 jne 0x977 3f: 45 rex.RB