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AJvYcCWTVbs/nYy3XVwKm9/cZEjHuY0kq1k70AYBL2LdWbl6U3iDGqWRlnEf9yhvpYiLwamAAsYaInzixg==@vger.kernel.org X-Gm-Message-State: AOJu0YywkkhJUCxmFWlGMvSgoB4be+K+boK5d+zdY6qGVnWi6bhHO5QQ muzOpH0XFJe1U6V3+m6C+taBAq3EkJlDnTrQxwvIwsOvjJ4X7+g31R2zSAS4SDxxvNExr8yFAgm I7pyVIRsa3oUiVt+cKI1JKpRIzCZSbaI+KiYn/wCQ1y92s9We20pz44oUOLM= X-Google-Smtp-Source: AGHT+IH/bZTUXapN1C1WSSJ/Htyw/UOAPNqevCYm/BxY8VWa2dOwisSPsMgrFat4dA0UVlS9ncc3O1T5FlPXRF2tD+k8kj43UuXR Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3fcc:b0:87c:3872:6787 with SMTP id ca18e2360f4ac-87c64f3ff78mr602917039f.1.1753281868315; Wed, 23 Jul 2025 07:44:28 -0700 (PDT) Date: Wed, 23 Jul 2025 07:44:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6880f54c.050a0220.248954.0000.GAE@google.com> Subject: [syzbot] [input?] [usb?] [io-uring?] INFO: task hung in io_wq_put_and_exit (5) From: syzbot To: anna-maria@linutronix.de, asml.silence@gmail.com, axboe@kernel.dk, frederic@kernel.org, io-uring@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: bf61759db409 Merge tag 'sched_ext-for-6.16-rc6-fixes' of g.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12b877d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=415e83411fefd73f dashboard link: https://syzkaller.appspot.com/bug?extid=e328767eafd849df0a78 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=110b938c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1622a38c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/22c5f1286a72/disk-bf61759d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cc79af4d966c/vmlinux-bf61759d.xz kernel image: https://storage.googleapis.com/syzbot-assets/b2e6d621f424/bzImage-bf61759d.xz The issue was bisected to: commit e5598d6ae62626d261b046a2f19347c38681ff51 Author: Pavel Begunkov Date: Thu Aug 24 22:53:31 2023 +0000 io_uring: compact SQ/CQ heads/tails bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12c92b82580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11c92b82580000 console output: https://syzkaller.appspot.com/x/log.txt?x=16c92b82580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e328767eafd849df0a78@syzkaller.appspotmail.com Fixes: e5598d6ae626 ("io_uring: compact SQ/CQ heads/tails") INFO: task syz-executor971:5849 blocked for more than 143 seconds. Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor971 state:D stack:26488 pid:5849 tgid:5849 ppid:5844 task_flags:0x400148 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:116 io_wq_exit_workers io_uring/io-wq.c:1319 [inline] io_wq_put_and_exit+0x271/0x8d0 io_uring/io-wq.c:1347 io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203 io_uring_cancel_generic+0x69c/0x9a0 io_uring/io_uring.c:3212 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x2ce/0x2bd0 kernel/exit.c:911 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 __do_sys_exit_group kernel/exit.c:1116 [inline] __se_sys_exit_group kernel/exit.c:1114 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f141ec08e39 RSP: 002b:00007ffcd1b0b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f141ec08e39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f141ec843b0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 00007f141ec843b0 R13: 0000000000000000 R14: 00007f141ec880c0 R15: 00007f141ebd7020 INFO: task syz-executor971:5850 blocked for more than 143 seconds. Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor971 state:D stack:26488 pid:5850 tgid:5850 ppid:5846 task_flags:0x400148 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:116 io_wq_exit_workers io_uring/io-wq.c:1319 [inline] io_wq_put_and_exit+0x271/0x8d0 io_uring/io-wq.c:1347 io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203 io_uring_cancel_generic+0x69c/0x9a0 io_uring/io_uring.c:3212 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x2ce/0x2bd0 kernel/exit.c:911 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 __do_sys_exit_group kernel/exit.c:1116 [inline] __se_sys_exit_group kernel/exit.c:1114 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f141ec08e39 RSP: 002b:00007ffcd1b0b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f141ec08e39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f141ec843b0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 00007f141ec843b0 R13: 0000000000000000 R14: 00007f141ec880c0 R15: 00007f141ebd7020 INFO: task syz-executor971:5851 blocked for more than 143 seconds. Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor971 state:D stack:27256 pid:5851 tgid:5851 ppid:5845 task_flags:0x400148 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:116 io_wq_exit_workers io_uring/io-wq.c:1319 [inline] io_wq_put_and_exit+0x271/0x8d0 io_uring/io-wq.c:1347 io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203 io_uring_cancel_generic+0x69c/0x9a0 io_uring/io_uring.c:3212 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x2ce/0x2bd0 kernel/exit.c:911 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 __do_sys_exit_group kernel/exit.c:1116 [inline] __se_sys_exit_group kernel/exit.c:1114 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f141ec08e39 RSP: 002b:00007ffcd1b0b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f141ec08e39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f141ec843b0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 00007f141ec843b0 R13: 0000000000000000 R14: 00007f141ec880c0 R15: 00007f141ebd7020 INFO: task syz-executor971:5852 blocked for more than 144 seconds. Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor971 state:D stack:26312 pid:5852 tgid:5852 ppid:5848 task_flags:0x400148 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:116 io_wq_exit_workers io_uring/io-wq.c:1319 [inline] io_wq_put_and_exit+0x271/0x8d0 io_uring/io-wq.c:1347 io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203 io_uring_cancel_generic+0x69c/0x9a0 io_uring/io_uring.c:3212 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x2ce/0x2bd0 kernel/exit.c:911 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 __do_sys_exit_group kernel/exit.c:1116 [inline] __se_sys_exit_group kernel/exit.c:1114 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f141ec08e39 RSP: 002b:00007ffcd1b0b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f141ec08e39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f141ec843b0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 00007f141ec843b0 R13: 0000000000000000 R14: 00007f141ec880c0 R15: 00007f141ebd7020 INFO: task syz-executor971:5853 blocked for more than 144 seconds. Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor971 state:D stack:27080 pid:5853 tgid:5853 ppid:5847 task_flags:0x400148 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:116 io_wq_exit_workers io_uring/io-wq.c:1319 [inline] io_wq_put_and_exit+0x271/0x8d0 io_uring/io-wq.c:1347 io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203 io_uring_cancel_generic+0x69c/0x9a0 io_uring/io_uring.c:3212 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x2ce/0x2bd0 kernel/exit.c:911 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 __do_sys_exit_group kernel/exit.c:1116 [inline] __se_sys_exit_group kernel/exit.c:1114 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f141ec08e39 RSP: 002b:00007ffcd1b0b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f141ec08e39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f141ec843b0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 00007f141ec843b0 R13: 0000000000000000 R14: 00007f141ec880c0 R15: 00007f141ebd7020 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770 2 locks held by getty/5594: #0: ffff888032cc90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900036cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xf70/0x12c0 kernel/hung_task.c:470 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82 Code: 7b 6d 02 e9 83 fb 02 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 99 23 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c6 RAX: 00000000000d6725 RBX: 0000000000000000 RCX: ffffffff8b867c99 RDX: 0000000000000000 RSI: ffffffff8de2fff6 RDI: ffffffff8c157460 RBP: fffffbfff1c52ef0 R08: 0000000000000001 R09: ffffed1017086645 R10: ffff8880b843322b R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff8e297780 R14: ffffffff90a94550 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124720000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e50c02d168 CR3: 000000000e382000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:749 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x391/0x510 kernel/sched/idle.c:325 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423 rest_init+0x16b/0x2b0 init/main.c:745 start_kernel+0x3ee/0x4d0 init/main.c:1102 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x148 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup