INFO: task syz.3.43:6719 blocked for more than 143 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.43 state:D stack:25128 pid:6719 tgid:6718 ppid:6371 task_flags:0x40054c flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1794/0x4c40 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x161/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:7115 rwsem_down_write_slowpath+0x922/0x10d0 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1a7/0x1f0 kernel/locking/rwsem.c:1591 mmap_write_lock include/linux/mmap_lock.h:397 [inline] exit_mmap+0x28a/0xb10 mm/mmap.c:1288 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1d6/0x2b0 kernel/exit.c:582 do_exit+0x644/0x22f0 kernel/exit.c:949 do_group_exit+0x218/0x2d0 kernel/exit.c:1102 get_signal+0x125a/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x96/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x71/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x213/0x2e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f75ae78eec9 RSP: 002b:00007f75af5780e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f75ae9e5fa8 RCX: 00007f75ae78eec9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f75ae9e5fac RBP: 00007f75ae9e5fa0 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f75ae9e6038 R14: 00007ffd360f0060 R15: 00007ffd360f0148 INFO: task syz.3.43:6719 is blocked on an rw-semaphore, but the owner is not found. Showing all locks held in the system: 2 locks held by kworker/u8:0/12: #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b0/0x1780 kernel/workqueue.c:3319 #1: ffffc90000117ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000117ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9eb/0x1780 kernel/workqueue.c:3319 1 lock held by khungtaskd/31: #0: ffffffff8db39660 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8db39660 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8db39660 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/1:1/43: #0: ffff888019c80d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888019c80d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b0/0x1780 kernel/workqueue.c:3319 #1: ffffc90000b37ba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000b37ba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9eb/0x1780 kernel/workqueue.c:3319 #2: ffff88805cedf240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x267/0x3180 drivers/net/netdevsim/fib.c:1490 2 locks held by kworker/u8:4/59: #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b0/0x1780 kernel/workqueue.c:3319 #1: ffffc9000210fba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000210fba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9eb/0x1780 kernel/workqueue.c:3319 2 locks held by kworker/u8:5/961: 2 locks held by kworker/u8:8/3541: #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888019c89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b0/0x1780 kernel/workqueue.c:3319 #1: ffffc9000ca67ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000ca67ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9eb/0x1780 kernel/workqueue.c:3319 2 locks held by udevd/5167: #0: ffffffff8dbf08d0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1484 [inline] #0: ffffffff8dbf08d0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x131/0x4b0 kernel/fork.c:1537 #1: ffff88807d792ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #1: ffff88807d792ce0 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12a/0x1a90 mm/mmap.c:1727 2 locks held by getty/5556: #0: ffff88803349e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43a/0x1400 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/6359: #0: ffff88807a0d4260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807a0d4260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6362: #0: ffff88807a0d01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807a0d01e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6367: #0: ffff8880271b4d20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff8880271b4d20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6374: #0: ffff8880271b2ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff8880271b2ce0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.3.43/6719: #0: ffff88802f7fb7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88802f7fb7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.1.50/6744: #0: ffff88802fd4cd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88802fd4cd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by dhcpcd-run-hook/6745: #0: ffff88807e1d9760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807e1d9760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 3 locks held by kworker/1:6/6746: #0: ffff888019c80d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888019c80d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b0/0x1780 kernel/workqueue.c:3319 #1: ffffc9000421fba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000421fba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9eb/0x1780 kernel/workqueue.c:3319 #2: ffff88807673e240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x267/0x3180 drivers/net/netdevsim/fib.c:1490 1 lock held by syz-executor/6748: #0: ffff88807e1dc260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807e1dc260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by udevd/6749: #0: ffff88807e1dd7e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88807e1dd7e0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x158/0x3c0 mm/vma.c:3152 1 lock held by syz-executor/6767: #0: ffff88802802cd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88802802cd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6768: #0: ffff88805c84e2a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c84e2a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6769: #0: ffff888079bbed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888079bbed60 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6771: #0: ffff88805c84c260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c84c260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by udevd/6780: #0: ffff88805c848ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88805c848ca0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x158/0x3c0 mm/vma.c:3152 1 lock held by syz.6.91/6956: #0: ffff888026d401e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888026d401e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.5.92/6958: #0: ffff888079bb8ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888079bb8ca0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/7766: #0: ffff88802f7fed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88802f7fed60 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/7774: #0: ffff88805ae69760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805ae69760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/7779: #0: ffff88806c6da220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88806c6da220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/7799: #0: ffff88805ae6ace0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805ae6ace0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.9.627/8103: #0: ffff88805c2e0ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c2e0ca0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.0.638/8128: #0: ffff88805c2e4260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c2e4260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.1.639/8130: #0: ffff88805c84b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c84b7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8133: #0: ffff88805c8481e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c8481e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8160: #0: ffff88805c849760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c849760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8162: #0: ffff88807d792220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807d792220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.6.642/8304: #0: ffff88807cea8ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by modprobe/8305: #0: ffff88807ceaa220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88807ceaa220 (&mm->mmap_lock){++++}-{4:4}, at: setup_arg_pages+0x2af/0xa80 fs/exec.c:650 1 lock held by syz-executor/8318: #0: ffff88806c6d8ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88806c6d8ca0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by udevd/8320: #0: ffff88807cfd01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88807cfd01e0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x158/0x3c0 mm/vma.c:3152 1 lock held by syz-executor/8321: #0: ffff88807cfd4d20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807cfd4d20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8338: #0: ffff88806c6dc260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88806c6dc260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8340: #0: ffff88806c6dcd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88806c6dcd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.3.690/8429: #0: ffff88805c2e37a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c2e37a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.1.692/8431: #0: ffff88805c2e2ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c2e2ce0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.9.693/8432: #0: ffff888019c72220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888019c72220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8435: #0: ffff888019c76d60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888019c76d60 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8440: #0: ffff888019c72ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888019c72ce0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8441: #0: ffff88805c2e2220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805c2e2220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.0.712/8555: #0: ffff88807da1c260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807da1c260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.6.721/8580: #0: ffff888019c74d20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888019c74d20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.5.846/8857: #0: ffff888028baace0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888028baace0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.7.644/8858: #0: ffff888028bacd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888028bacd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/8862: 1 lock held by syz-executor/8864: #0: ffffffff8ee6cbc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8ee6cbc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3ac/0x18a0 net/ipv4/devinet.c:978 1 lock held by modprobe/8924: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x185/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39a/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x176/0x2e0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline] watchdog+0x15a7/0x15f0 kernel/hung_task.c:491 kthread+0x70a/0x890 kernel/kthread.c:463 ret_from_fork+0x431/0x7a0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6867 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_preemption_disabled+0x63/0x110 lib/smp_processor_id.c:19 Code: 08 0f 85 ca 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <74> c8 65 4c 8b 3c 25 08 50 18 92 41 f6 47 2f 04 74 0a 41 83 bf 18 RSP: 0018:ffffc9000474f860 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffff888026bbbc00 RCX: 0000000080000000 RDX: 0000000000000006 RSI: ffffffff8d2e089d RDI: ffffffff8b7e7480 RBP: ffffc9000474f958 R08: ffffffff8f35e277 R09: 1ffffffff1e6bc4e R10: dffffc0000000000 R11: fffffbfff1e6bc4f R12: ffffffff8adcd118 R13: dffffc0000000000 R14: ffffffff818381c9 R15: 1ffff920008e9f18 FS: 0000000000000000(0000) GS:ffff88812679b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f114184435d CR3: 0000000074c16000 CR4: 00000000003526f0 Call Trace: lockdep_hardirqs_on+0x94/0x150 kernel/locking/lockdep.c:4472 __local_bh_enable_ip+0x129/0x1c0 kernel/softirq.c:412 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x318/0x3b0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x324/0x600 net/batman-adv/network-coding.c:720 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xada/0x1780 kernel/workqueue.c:3319 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3400 kthread+0x70a/0x890 kernel/kthread.c:463 ret_from_fork+0x431/0x7a0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245