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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop\n\nCurrently this is checked before running the pending work. Normally this\nis quite fine, as work items either end up blocking (which will create a\nnew worker for other items), or they complete fairly quickly. But syzbot\nreports an issue where io-wq takes seemingly forever to exit, and with a\nbit of debugging, this turns out to be because it queues a bunch of big\n(2GB - 4096b) reads with a /dev/msr* file. Since this file type doesn\u0027t\nsupport -\u003eread_iter(), loop_rw_iter() ends up handling them. Each read\nreturns 16MB of data read, which takes 20 (!!) seconds. With a bunch of\nthese pending, processing the whole chain can take a long time. Easily\nlonger than the syzbot uninterruptible sleep timeout of 140 seconds.\nThis then triggers a complaint off the io-wq exit path:\n\nINFO: task syz.4.135:6326 blocked for more than 143 seconds.\n      Not tainted syzkaller #0\n      Blocked by coredump.\n\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:syz.4.135       state:D stack:26824 pid:6326  tgid:6324  ppid:5957   task_flags:0x400548 flags:0x00080000\nCall Trace:\n \u003cTASK\u003e\n context_switch kernel/sched/core.c:5256 [inline]\n __schedule+0x1139/0x6150 kernel/sched/core.c:6863\n __schedule_loop kernel/sched/core.c:6945 [inline]\n schedule+0xe7/0x3a0 kernel/sched/core.c:6960\n schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75\n do_wait_for_common kernel/sched/completion.c:100 [inline]\n __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121\n io_wq_exit_workers io_uring/io-wq.c:1328 [inline]\n io_wq_put_and_exit+0x271/0x8a0 io_uring/io-wq.c:1356\n io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203\n io_uring_cancel_generic+0x69c/0x9a0 io_uring/cancel.c:651\n io_uring_files_cancel include/linux/io_uring.h:19 [inline]\n do_exit+0x2ce/0x2bd0 kernel/exit.c:911\n do_group_exit+0xd3/0x2a0 kernel/exit.c:1112\n get_signal+0x2671/0x26d0 kernel/signal.c:3034\n arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337\n __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]\n exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75\n __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]\n syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]\n syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]\n syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]\n do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fa02738f749\nRSP: 002b:00007fa0281ae0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca\nRAX: fffffffffffffe00 RBX: 00007fa0275e6098 RCX: 00007fa02738f749\nRDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa0275e6098\nRBP: 00007fa0275e6090 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007fa0275e6128 R14: 00007fff14e4fcb0 R15: 00007fff14e4fd98\n\nThere\u0027s really nothing wrong here, outside of processing these reads\nwill take a LONG time. However, we can speed up the exit by checking the\nIO_WQ_BIT_EXIT inside the io_worker_handle_work() loop, as syzbot will\nexit the ring after queueing up all of these reads. Then once the first\nitem is processed, io-wq will simply cancel the rest. That should avoid\nsyzbot running into this complaint again."
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        "dateUpdated": "2026-05-11T22:00:22.445Z",
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          "url": "https://git.kernel.org/stable/c/27e47500fac23d15b7dc93ff650bc4844d2581bd"
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          "url": "https://git.kernel.org/stable/c/10dc959398175736e495f71c771f8641e1ca1907"
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