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9hSLlXx25pnz4FdRmSChdoNkG8QIYzvgKxU3rgoI8x6oltE+ecRKld46o1FKp3Lk1kDv5tvNsSPyrN9iw7MQZA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB5127 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "WARNING:at_kernel/workqueue.c:#enable_work" on: commit: 81d246ffd402b46338d8a3e0cd23f474195dd236 ("[PATCH] tty/vt: Fix possible deadlock in input_inject_event") url: https://github.com/intel-lab-lkp/linux/commits/pengyu/tty-vt-Fix-possible-deadlock-in-input_inject_event/20250928-211353 base: https://git.kernel.org/cgit/linux/kernel/git/gregkh/tty.git tty-testing patch link: https://lore.kernel.org/all/20250928130819.383808-1-pengyu@kylinos.cn/ patch subject: [PATCH] tty/vt: Fix possible deadlock in input_inject_event in testcase: boot config: x86_64-kexec compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +--------------------------------------------+------------+------------+ | | f4abab3508 | 81d246ffd4 | +--------------------------------------------+------------+------------+ | WARNING:at_kernel/workqueue.c:#enable_work | 0 | 12 | | RIP:enable_work | 0 | 12 | +--------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202509301323.34d956e1-lkp@intel.com [ 0.877354][ T1] ------------[ cut here ]------------ [ 0.878411][ T1] workqueue: work disable count underflowed [ 0.879704][ T1] WARNING: CPU: 0 PID: 1 at kernel/workqueue.c:4326 enable_work (kernel/workqueue.c:4326) [ 0.881213][ T1] Modules linked in: [ 0.881232][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc6-00045-g81d246ffd402 #1 PREEMPT(voluntary) [ 0.881232][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 0.881232][ T1] RIP: 0010:enable_work (kernel/workqueue.c:4326) [ 0.881232][ T1] Code: 5e 5d e9 0c c1 ec 00 cc 0f 0b eb 9b 31 ed 80 3d 1e e8 c6 01 00 75 a0 c6 05 15 e8 c6 01 01 48 c7 c7 cd bf 6d 82 e8 89 26 f3 ff <0f> 0b eb 89 0f 0b eb 93 e8 cc c7 eb 00 66 66 66 2e 0f 1f 84 00 00 All code ======== 0: 5e pop %rsi 1: 5d pop %rbp 2: e9 0c c1 ec 00 jmp 0xecc113 7: cc int3 8: 0f 0b ud2 a: eb 9b jmp 0xffffffffffffffa7 c: 31 ed xor %ebp,%ebp e: 80 3d 1e e8 c6 01 00 cmpb $0x0,0x1c6e81e(%rip) # 0x1c6e833 15: 75 a0 jne 0xffffffffffffffb7 17: c6 05 15 e8 c6 01 01 movb $0x1,0x1c6e815(%rip) # 0x1c6e833 1e: 48 c7 c7 cd bf 6d 82 mov $0xffffffff826dbfcd,%rdi 25: e8 89 26 f3 ff call 0xfffffffffff326b3 2a:* 0f 0b ud2 <-- trapping instruction 2c: eb 89 jmp 0xffffffffffffffb7 2e: 0f 0b ud2 30: eb 93 jmp 0xffffffffffffffc5 32: e8 cc c7 eb 00 call 0xebc803 37: 66 data16 38: 66 data16 39: 66 data16 3a: 2e cs 3b: 0f .byte 0xf 3c: 1f (bad) 3d: 84 00 test %al,(%rax) ... Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: eb 89 jmp 0xffffffffffffff8d 4: 0f 0b ud2 6: eb 93 jmp 0xffffffffffffff9b 8: e8 cc c7 eb 00 call 0xebc7d9 d: 66 data16 e: 66 data16 f: 66 data16 10: 2e cs 11: 0f .byte 0xf 12: 1f (bad) 13: 84 00 test %al,(%rax) ... [ 0.881232][ T1] RSP: 0000:ffffc90000013b28 EFLAGS: 00010046 [ 0.881232][ T1] RAX: 63593ad70bfd2600 RBX: ffffffff82ead988 RCX: 63593ad70bfd2601 [ 0.881232][ T1] RDX: ffffc90000013918 RSI: 00000000ffff7fff RDI: 0000000000000001 [ 0.881232][ T1] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc90000013910 [ 0.881232][ T1] R10: 00000000ffff7fff R11: 0000000000000001 R12: 0000000000000000 [ 0.881232][ T1] R13: 0000000000000000 R14: 000fffffffe00001 R15: 0000000000000000 [ 0.881232][ T1] FS: 0000000000000000(0000) GS:ffff8884ac411000(0000) knlGS:0000000000000000 [ 0.881232][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.881232][ T1] CR2: ffff88843ffff000 CR3: 0000000002a30000 CR4: 00000000000406f0 [ 0.881232][ T1] Call Trace: [ 0.881232][ T1] [ 0.881232][ T1] kbd_init (include/linux/workqueue.h:730 drivers/tty/vt/keyboard.c:1666) [ 0.881232][ T1] vty_init (drivers/tty/vt/vt.c:3884) [ 0.881232][ T1] tty_init (drivers/tty/tty_io.c:3651) [ 0.881232][ T1] ? __pfx_chr_dev_init (drivers/char/mem.c:734) [ 0.881232][ T1] do_one_initcall (init/main.c:1269) [ 0.881232][ T1] ? __alloc_frozen_pages_noprof (mm/page_alloc.c:5148) [ 0.881232][ T1] ? alloc_pages_mpol (mm/mempolicy.c:2416) [ 0.881232][ T1] ? new_slab (mm/slub.c:560 mm/slub.c:2698 mm/slub.c:2714) [ 0.881232][ T1] ? __proc_create (fs/proc/generic.c:453) [ 0.881232][ T1] ? ida_alloc_range (include/linux/xarray.h:1437 lib/idr.c:461) [ 0.881232][ T1] ? parameq (kernel/params.c:90 kernel/params.c:99) [ 0.881232][ T1] ? __pfx_ignore_unknown_bootoption (init/main.c:1315) [ 0.881232][ T1] ? parse_args (kernel/params.c:153 kernel/params.c:186) [ 0.881232][ T1] do_initcall_level (init/main.c:1330) [ 0.881232][ T1] do_initcalls (init/main.c:1344) [ 0.881232][ T1] kernel_init_freeable (init/main.c:1583) [ 0.881232][ T1] ? __pfx_kernel_init (init/main.c:1461) [ 0.881232][ T1] kernel_init (init/main.c:1471) [ 0.881232][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 0.881232][ T1] ? __pfx_kernel_init (init/main.c:1461) [ 0.881232][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) [ 0.881232][ T1] [ 0.881232][ T1] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250930/202509301323.34d956e1-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki